Water Hardness in New York
Across 242 measured cities — with 441 more covered by labeled county-level estimates — New York's median tap water hardness is 55.3 mg/L (3.2 gpg): soft on the USGS scale. Below: every covered city, the state's hardest and softest water, and the geology that explains it.
Data updated July 6, 2026. Sources: utility-reported water quality data and USGS/EPA Water Quality Portal samples.
State Median
55.3
mg/L (3.2 gpg), measured cities
Measured Range
6.1-211.0
mg/L across measured cities
Measured Cities
242
utility-reported or computed values
County Estimates
441
65% of covered cities
New York Cities by Hardness Category
Measured cities only — labeled county estimates never enter the category counts or the median.
| Category | Range | Measured cities | Share |
|---|---|---|---|
| Soft | 0-60 mg/L | 133 | 55.0% |
| Moderately hard | 60-120 mg/L | 93 | 38.4% |
| Hard | 120-180 mg/L | 13 | 5.4% |
| Very hard | >180 mg/L | 3 | 1.2% |
Hardest and Softest Water in New York
Measured values only; labeled county estimates and values under active dispute never rank.
Hardest water in New York
- Niskayuna — 211.0 mg/L (12.3 gpg), very hard
- Schenectady — 190.0 mg/L (11.1 gpg), very hard
- Downsville — 181.9 mg/L (10.6 gpg), very hard
- Cayuga Heights — 145.0 mg/L (8.5 gpg), hard
- Owego — 138.3 mg/L (8.1 gpg), hard
Softest water in New York
- Irvington — 6.1 mg/L (0.4 gpg), soft
- Larchmont — 6.2 mg/L (0.4 gpg), soft
- Mamaroneck — 6.2 mg/L (0.4 gpg), soft
- New Rochelle — 6.2 mg/L (0.4 gpg), soft
- Massapequa Park — 8.3 mg/L (0.5 gpg), soft
Every Covered City in New York
All 683 covered New York cities, sorted by population served. "County estimate" rows are labeled context values from USGS/EPA Water Quality Portal county sampling — they never enter the median above. City names link to each city's full water quality page.
| City | Hardness (mg/L) | gpg | Category | Data |
|---|---|---|---|---|
| New York | 30.8 | 1.8 | Soft | Utility-reported |
| Bellerose | 30.8 | 1.8 | Soft | Utility-reported |
| Bellerose Terrace | 30.8 | 1.8 | Soft | Utility-reported |
| Harbor Hills | 30.8 | 1.8 | Soft | Utility-reported |
| University Gardens | 30.8 | 1.8 | Soft | Utility-reported |
| Flushing | 30.4 | 1.8 | Soft | Utility-reported |
| North Amityville | 10.1 | 0.6 | Soft | Utility-reported |
| Hauppauge | 85.2 | 5.0 | Moderately hard | Utility-reported |
| Rochester | 104.7 | 6.1 | Moderately hard | Utility-reported |
| Syracuse | 108.7 | 6.4 | Moderately hard | Utility-reported |
| Nedrow | 108.2 | 6.3 | Moderately hard | Utility-reported |
| Solvay | 108.2 | 6.3 | Moderately hard | Utility-reported |
| Irondequoit | 112.0 | 6.5 | Moderately hard | Utility-reported |
| Gates | 112.0 | 6.5 | Moderately hard | Utility-reported |
| Greece | 112.0 | 6.5 | Moderately hard | Utility-reported |
| Hilton | 112.0 | 6.5 | Moderately hard | Utility-reported |
| North Gates | 112.0 | 6.5 | Moderately hard | Utility-reported |
| Spencerport | 112.0 | 6.5 | Moderately hard | Utility-reported |
| Rye Brook | 49.2 | 2.9 | Soft | Utility-reported |
| Tonawanda | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Hamburg | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Oswego | 105.0 | 6.1 | Moderately hard | Utility-reported |
| De Witt | 106.0 | 6.2 | Moderately hard | Utility-reported |
| Fayetteville | 106.0 | 6.2 | Moderately hard | Utility-reported |
| Manlius | 106.0 | 6.2 | Moderately hard | Utility-reported |
| Baldwinsville | 105.0 | 6.1 | Moderately hard | Utility-reported |
| West Seneca | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Lancaster | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Phoenix | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Port Chester | 52.6 | 3.1 | Soft | Utility-reported |
| Scotts Corners | 52.6 | 3.1 | Soft | Utility-reported |
| Constantia | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Galeville | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Brewerton | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Bridgeport | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Camden | 100.5 | 5.9 | Moderately hard | County estimate |
| Camillus | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Canastota | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Central Square | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Chittenango | 105.0 | 6.1 | Moderately hard | Utility-reported |
| East Syracuse | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Fairmount | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Fulton | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Hannibal | 176.0 | 10.3 | Hard | County estimate |
| Lakeland | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Liverpool | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Lyncourt | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Marcellus | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Mattydale | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Minetto | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Minoa | 105.0 | 6.1 | Moderately hard | Utility-reported |
| North Syracuse | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Radisson | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Sand Ridge | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Seneca Knolls | 105.0 | 6.1 | Moderately hard | Utility-reported |
| SUNY Oswego | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Sylvan Beach | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Village Green | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Wampsville | 105.0 | 6.1 | Moderately hard | Utility-reported |
| Westvale | 105.0 | 6.1 | Moderately hard | Utility-reported |
| East Aurora | 109.1 | 6.4 | Moderately hard | Utility-reported |
| Billington Heights | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Blasdell | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Cheektowaga | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Clarence | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Clarence Center | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Depew | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Eden | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Eggertsville | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Harris Hill | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Highland-on-the-Lake | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Lackawanna | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Sloan | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Town Line | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Wanakah | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Williamsville | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Hempstead | 52.7 | 3.1 | Soft | Utility-reported |
| Buffalo | 86.5 | 5.1 | Moderately hard | Utility-reported |
| Lynbrook | 31.7 | 1.9 | Soft | Utility-reported |
| Monsey | 106.0 | 6.2 | Moderately hard | County estimate |
| Garden City South | 48.3 | 2.8 | Soft | Utility-reported |
| Garden City | 50.6 | 3.0 | Soft | Utility-reported |
| Garden City Park | 50.6 | 3.0 | Soft | Utility-reported |
| North Lynbrook | 29.0 | 1.7 | Soft | Utility-reported |
| Tuckahoe | 13.9 | 0.8 | Soft | Utility-reported |
| Eastchester | 13.9 | 0.8 | Soft | Utility-reported |
| Hemlock | 87.8 | 5.1 | Moderately hard | Utility-reported |
| Yonkers | 34.8 | 2.0 | Soft | Utility-reported |
| Malverne Park Oaks | 48.2 | 2.8 | Soft | Utility-reported |
| West Hempstead | 48.2 | 2.8 | Soft | Utility-reported |
| Mineola | 50.6 | 3.0 | Soft | Utility-reported |
| Franklin Square | 48.0 | 2.8 | Soft | Utility-reported |
| Seaford | 13.0 | 0.8 | Soft | Utility-reported |
| Carle Place | 51.1 | 3.0 | Soft | Utility-reported |
| Malverne | 51.1 | 3.0 | Soft | Utility-reported |
| Uniondale | 51.1 | 3.0 | Soft | Utility-reported |
| New Hyde Park | 53.4 | 3.1 | Soft | Utility-reported |
| Manhasset | 66.5 | 3.9 | Moderately hard | Utility-reported |
| Munsey Park | 66.5 | 3.9 | Moderately hard | Utility-reported |
| North Hills | 66.5 | 3.9 | Moderately hard | Utility-reported |
| Plandome Heights | 66.5 | 3.9 | Moderately hard | Utility-reported |
| Albany | 75.3 | 4.4 | Moderately hard | Utility-reported |
| Lake Success | 66.5 | 3.9 | Moderately hard | Utility-reported |
| Thomaston | 66.5 | 3.9 | Moderately hard | Utility-reported |
| Harrison | 17.2 | 1.0 | Soft | Utility-reported |
| Flower Hill | 58.9 | 3.4 | Soft | Utility-reported |
| Plandome Manor | 58.9 | 3.4 | Soft | Utility-reported |
| Port Washington | 58.9 | 3.4 | Soft | Utility-reported |
| East Williston | 53.5 | 3.1 | Soft | Utility-reported |
| Roslyn | 56.3 | 3.3 | Soft | Utility-reported |
| Searingtown | 58.2 | 3.4 | Soft | Utility-reported |
| Stewart Manor | 50.3 | 2.9 | Soft | Utility-reported |
| Roslyn Estates | 57.2 | 3.4 | Soft | Utility-reported |
| Roslyn Heights | 54.8 | 3.2 | Soft | Utility-reported |
| Herricks | 55.3 | 3.2 | Soft | Utility-reported |
| Williston Park | 55.3 | 3.2 | Soft | Utility-reported |
| Marcy | 100.5 | 5.9 | Moderately hard | County estimate |
| New Hartford | 100.5 | 5.9 | Moderately hard | County estimate |
| New York Mills | 100.5 | 5.9 | Moderately hard | County estimate |
| Utica | 100.5 | 5.9 | Moderately hard | County estimate |
| Whitesboro | 100.5 | 5.9 | Moderately hard | County estimate |
| Yorkville | 100.5 | 5.9 | Moderately hard | County estimate |
| Old Westbury | 53.8 | 3.1 | Soft | Utility-reported |
| East Hills | 55.6 | 3.3 | Soft | Utility-reported |
| Plandome | 55.6 | 3.3 | Soft | Utility-reported |
| Roslyn Harbor | 55.6 | 3.3 | Soft | Utility-reported |
| Scarsdale | 12.9 | 0.8 | Soft | Utility-reported |
| Albertson | 55.2 | 3.2 | Soft | Utility-reported |
| Elmont | 55.2 | 3.2 | Soft | Utility-reported |
| Floral Park | 55.2 | 3.2 | Soft | Utility-reported |
| Great Neck | 55.2 | 3.2 | Soft | Utility-reported |
| Great Neck Estates | 55.2 | 3.2 | Soft | Utility-reported |
| Great Neck Gardens | 55.2 | 3.2 | Soft | Utility-reported |
| Great Neck Plaza | 55.2 | 3.2 | Soft | Utility-reported |
| Greenvale | 55.2 | 3.2 | Soft | Utility-reported |
| Kensington | 55.2 | 3.2 | Soft | Utility-reported |
| Kings Point | 55.2 | 3.2 | Soft | Utility-reported |
| Manhasset Hills | 55.2 | 3.2 | Soft | Utility-reported |
| North New Hyde Park | 55.2 | 3.2 | Soft | Utility-reported |
| North Valley Stream | 55.2 | 3.2 | Soft | Utility-reported |
| Russell Gardens | 55.2 | 3.2 | Soft | Utility-reported |
| Saddle Rock | 55.2 | 3.2 | Soft | Utility-reported |
| South Floral Park | 55.2 | 3.2 | Soft | Utility-reported |
| Westbury | 55.2 | 3.2 | Soft | Utility-reported |
| Freeport | 32.9 | 1.9 | Soft | Utility-reported |
| Roosevelt | 32.9 | 1.9 | Soft | Utility-reported |
| White Plains | 20.6 | 1.2 | Soft | Utility-reported |
| Watervliet | 78.2 | 4.6 | Moderately hard | County estimate |
| Massapequa Park | 8.3 | 0.5 | Soft | Utility-reported |
| Latham | 78.2 | 4.6 | Moderately hard | County estimate |
| Fairview | 17.4 | 1.0 | Soft | Utility-reported |
| Centerport | 37.9 | 2.2 | Soft | County estimate |
| Lakeview | 39.0 | 2.3 | Soft | Utility-reported |
| Rockville Centre | 39.0 | 2.3 | Soft | Utility-reported |
| South Hempstead | 39.0 | 2.3 | Soft | Utility-reported |
| Old Bethpage | 36.8 | 2.1 | Soft | Utility-reported |
| Mount Vernon | 24.2 | 1.4 | Soft | Utility-reported |
| Pelham Manor | 24.2 | 1.4 | Soft | Utility-reported |
| Horseheads | 136.0 | 8.0 | Hard | Utility-reported |
| Larchmont | 6.2 | 0.4 | Soft | Utility-reported |
| Endicott | 61.0 | 3.6 | Moderately hard | County estimate |
| New Rochelle | 6.2 | 0.4 | Soft | Utility-reported |
| Big Flats | 136.0 | 8.0 | Hard | Utility-reported |
| Schenectady | 190.0 | 11.1 | Very hard | Utility-reported |
| Hartsdale | 19.5 | 1.1 | Soft | Utility-reported |
| Binghamton | 61.0 | 3.6 | Moderately hard | County estimate |
| Mamaroneck | 6.2 | 0.4 | Soft | Utility-reported |
| Syosset | 24.1 | 1.4 | Soft | Utility-reported |
| Valhalla | 18.4 | 1.1 | Soft | Utility-reported |
| North Merrick | 42.3 | 2.5 | Soft | Utility-reported |
| Niagara Falls | 167.0 | 9.8 | Hard | County estimate |
| Baldwin | 42.3 | 2.5 | Soft | Utility-reported |
| East Meadow | 42.3 | 2.5 | Soft | Utility-reported |
| Merrick | 42.3 | 2.5 | Soft | Utility-reported |
| Oceanside | 42.3 | 2.5 | Soft | Utility-reported |
| Buchanan | 99.8 | 5.8 | Moderately hard | Utility-reported |
| Green Island | 58.7 | 3.4 | Soft | Utility-reported |
| Elmira | 136.0 | 8.0 | Hard | Utility-reported |
| Elmira Heights | 136.0 | 8.0 | Hard | Utility-reported |
| West Elmira | 136.0 | 8.0 | Hard | Utility-reported |
| Farmingdale | 10.1 | 0.6 | Soft | Utility-reported |
| Peekskill | 99.8 | 5.8 | Moderately hard | Utility-reported |
| Troy | 58.7 | 3.4 | Soft | Utility-reported |
| Rome | 22.5 | 1.3 | Soft | Utility-reported |
| North Tonawanda | 167.0 | 9.8 | Hard | County estimate |
| Hicksville | 17.7 | 1.0 | Soft | Computed from Ca+Mg |
| Conklin | 61.0 | 3.6 | Moderately hard | County estimate |
| Kirkwood | 61.0 | 3.6 | Moderately hard | County estimate |
| Ithaca | 128.0 | 7.5 | Hard | Utility-reported |
| Amityville | 10.1 | 0.6 | Soft | Utility-reported |
| Bethpage | 10.1 | 0.6 | Soft | Utility-reported |
| Copiague | 10.1 | 0.6 | Soft | Utility-reported |
| East Farmingdale | 10.1 | 0.6 | Soft | Utility-reported |
| East Massapequa | 10.1 | 0.6 | Soft | Utility-reported |
| Levittown | 10.1 | 0.6 | Soft | Utility-reported |
| Lindenhurst | 10.1 | 0.6 | Soft | Utility-reported |
| Massapequa | 10.1 | 0.6 | Soft | Utility-reported |
| North Lindenhurst | 10.1 | 0.6 | Soft | Utility-reported |
| North Massapequa | 10.1 | 0.6 | Soft | Utility-reported |
| North Wantagh | 10.1 | 0.6 | Soft | Utility-reported |
| Plainedge | 10.1 | 0.6 | Soft | Utility-reported |
| South Farmingdale | 10.1 | 0.6 | Soft | Utility-reported |
| Wantagh | 10.1 | 0.6 | Soft | Utility-reported |
| Elmsford | 17.4 | 1.0 | Soft | Utility-reported |
| Hyde Park | 83.8 | 4.9 | Moderately hard | County estimate |
| Lockport | 167.0 | 9.8 | Hard | County estimate |
| Greenlawn | 31.2 | 1.8 | Soft | Utility-reported |
| Greenburgh | 17.4 | 1.0 | Soft | Utility-reported |
| Greenville | 17.4 | 1.0 | Soft | Utility-reported |
| Crompond | 156.0 | 9.1 | Hard | County estimate |
| Shrub Oak | 156.0 | 9.1 | Hard | County estimate |
| Yorktown Heights | 156.0 | 9.1 | Hard | County estimate |
| Glens Falls | 18.2 | 1.1 | Soft | County estimate |
| Plattsburgh | 62.0 | 3.6 | Moderately hard | County estimate |
| Clifton Gardens | 123.0 | 7.2 | Hard | Utility-reported |
| Clifton Knolls-Mill Creek | 123.0 | 7.2 | Hard | Utility-reported |
| Clifton Park | 123.0 | 7.2 | Hard | Utility-reported |
| Country Knolls | 123.0 | 7.2 | Hard | Utility-reported |
| Riverhead | 37.9 | 2.2 | Soft | County estimate |
| Dix Hills | 21.0 | 1.2 | Soft | Utility-reported |
| Huntington | 21.0 | 1.2 | Soft | Utility-reported |
| Baxter Estates | 71.2 | 4.2 | Moderately hard | Utility-reported |
| Fort Drum | 62.0 | 3.6 | Moderately hard | County estimate |
| Plainview | 54.2 | 3.2 | Soft | Utility-reported |
| Port Washington North | 71.2 | 4.2 | Moderately hard | Utility-reported |
| Apalachin | 96.7 | 5.7 | Moderately hard | County estimate |
| Gloversville | 15.1 | 0.9 | Soft | County estimate |
| Arlington | 87.9 | 5.1 | Moderately hard | Utility-reported |
| Poughkeepsie | 87.9 | 5.1 | Moderately hard | Utility-reported |
| New Windsor | 26.2 | 1.5 | Soft | County estimate |
| Ossining | 103.0 | 6.0 | Moderately hard | Utility-reported |
| Westmere | 83.7 | 4.9 | Moderately hard | Utility-reported |
| Cortlandt Manor | 99.8 | 5.8 | Moderately hard | Utility-reported |
| 83 Broadway | 18.8 | 1.1 | Soft | Utility-reported |
| Newburgh | 18.8 | 1.1 | Soft | Utility-reported |
| Walworth | 288.0 | 16.8 | Very hard | County estimate |
| Orchard Park | 170.0 | 9.9 | Hard | County estimate |
| Kingston | 19.1 | 1.1 | Soft | Utility-reported |
| Amsterdam | 277.0 | 16.2 | Very hard | County estimate |
| Macedon | 288.0 | 16.8 | Very hard | County estimate |
| Niskayuna | 211.0 | 12.3 | Very hard | Utility-reported |
| Batavia | 238.0 | 13.9 | Very hard | County estimate |
| Canandaigua | 259.0 | 15.2 | Very hard | County estimate |
| Queensbury | 18.2 | 1.1 | Soft | County estimate |
| New Cassel | 44.8 | 2.6 | Soft | Computed from Ca+Mg |
| Cortland | 157.5 | 9.2 | Hard | County estimate |
| Kings Park | 45.9 | 2.7 | Soft | Utility-reported |
| Smithtown | 45.9 | 2.7 | Soft | Utility-reported |
| Village of the Branch | 45.9 | 2.7 | Soft | Utility-reported |
| Grand Island | 170.0 | 9.9 | Hard | County estimate |
| Beacon | 93.8 | 5.5 | Moderately hard | Utility-reported |
| Armonk | 156.0 | 9.1 | Hard | County estimate |
| Hawthorne | 20.7 | 1.2 | Soft | Utility-reported |
| Thornwood | 20.7 | 1.2 | Soft | Utility-reported |
| South Glens Falls | 88.3 | 5.2 | Moderately hard | County estimate |
| Cohoes | 78.2 | 4.6 | Moderately hard | County estimate |
| Massena | 37.6 | 2.2 | Soft | County estimate |
| Johnson City | 26.2 | 1.5 | Soft | County estimate |
| Cranberry Lake | 37.6 | 2.2 | Soft | County estimate |
| Ransomville | 167.0 | 9.8 | Hard | County estimate |
| Cayuga Heights | 145.0 | 8.5 | Hard | Utility-reported |
| Oneonta | 84.7 | 5.0 | Moderately hard | County estimate |
| Clay | 442.0 | 25.9 | Very hard | County estimate |
| Lansing | 169.5 | 9.9 | Hard | County estimate |
| Newfane | 167.0 | 9.8 | Hard | County estimate |
| East Greenbush | 104.0 | 6.1 | Moderately hard | County estimate |
| Ballston Spa | 88.3 | 5.2 | Moderately hard | County estimate |
| Olean | 82.4 | 4.8 | Moderately hard | County estimate |
| Nyack | 106.0 | 6.2 | Moderately hard | County estimate |
| Sherrill | 21.4 | 1.3 | Soft | Utility-reported |
| Owego | 138.3 | 8.1 | Hard | Computed from Ca+Mg |
| Fort Montgomery | 26.2 | 1.5 | Soft | County estimate |
| Malone | 15.9 | 0.9 | Soft | County estimate |
| Hampton Bays | 37.9 | 2.2 | Soft | County estimate |
| Pleasantville | 31.6 | 1.9 | Soft | Utility-reported |
| Suffern | 106.0 | 6.2 | Moderately hard | County estimate |
| Babylon | 32.7 | 1.9 | Soft | Utility-reported |
| Durhamville | 21.4 | 1.3 | Soft | Utility-reported |
| Dunkirk | 143.5 | 8.4 | Hard | County estimate |
| Monroe | 26.2 | 1.5 | Soft | County estimate |
| Oneida | 21.4 | 1.3 | Soft | Utility-reported |
| Fishkill | 83.8 | 4.9 | Moderately hard | County estimate |
| Oneida Castle | 21.4 | 1.3 | Soft | Utility-reported |
| Woodbury | 53.5 | 3.1 | Soft | County estimate |
| Warwick | 26.2 | 1.5 | Soft | County estimate |
| Bedford Hills | 156.0 | 9.1 | Hard | County estimate |
| Tarrytown | 19.0 | 1.1 | Soft | Utility-reported |
| Victor | 259.0 | 15.2 | Very hard | County estimate |
| Geneseo | 235.0 | 13.7 | Very hard | County estimate |
| Fort Edward | 108.5 | 6.3 | Moderately hard | County estimate |
| Seneca Falls | 218.5 | 12.8 | Very hard | County estimate |
| Fredonia | 143.5 | 8.4 | Hard | County estimate |
| Corning | 110.0 | 6.4 | Moderately hard | County estimate |
| Elma | 170.0 | 9.9 | Hard | County estimate |
| Wynantskill | 104.0 | 6.1 | Moderately hard | County estimate |
| Ontario | 288.0 | 16.8 | Very hard | County estimate |
| Ogdensburg | 37.6 | 2.2 | Soft | County estimate |
| Lakeville | 235.0 | 13.7 | Very hard | County estimate |
| Sleepy Hollow | 22.1 | 1.3 | Soft | Utility-reported |
| Waterford | 88.3 | 5.2 | Moderately hard | County estimate |
| Mount Kisco | 54.6 | 3.2 | Soft | Utility-reported |
| Chappaqua | 156.0 | 9.1 | Hard | County estimate |
| Rensselaer | 104.0 | 6.1 | Moderately hard | County estimate |
| Burnt Hills | 88.3 | 5.2 | Moderately hard | County estimate |
| Briarcliff Manor | 30.2 | 1.8 | Soft | Utility-reported |
| Katonah | 156.0 | 9.1 | Hard | County estimate |
| Waterloo | 218.5 | 12.8 | Very hard | County estimate |
| Dansville | 235.0 | 13.7 | Very hard | County estimate |
| Oyster Bay | 44.9 | 2.6 | Soft | Computed from Ca+Mg |
| Hornell | 110.0 | 6.4 | Moderately hard | County estimate |
| Potsdam | 37.6 | 2.2 | Soft | County estimate |
| Johnstown | 15.1 | 0.9 | Soft | County estimate |
| Ilion | 4.7 | 0.3 | Soft | County estimate |
| Croton-on-Hudson | 107.0 | 6.3 | Moderately hard | Utility-reported |
| Woodbourne | 11.5 | 0.7 | Soft | County estimate |
| Middleport | 167.0 | 9.8 | Hard | County estimate |
| Herkimer | 4.7 | 0.3 | Soft | County estimate |
| Chester | 26.2 | 1.5 | Soft | County estimate |
| Wilson | 167.0 | 9.8 | Hard | County estimate |
| Medina | 294.0 | 17.2 | Very hard | County estimate |
| Goshen | 26.2 | 1.5 | Soft | County estimate |
| Walden | 26.2 | 1.5 | Soft | County estimate |
| Hudson Falls | 108.5 | 6.3 | Moderately hard | County estimate |
| Irvington | 6.1 | 0.4 | Soft | Utility-reported |
| Williamson | 288.0 | 16.8 | Very hard | County estimate |
| Painted Post | 110.0 | 6.4 | Moderately hard | County estimate |
| Heritage Hills | 118.0 | 6.9 | Moderately hard | Utility-reported |
| Brocton | 143.5 | 8.4 | Hard | County estimate |
| Greenport | 37.9 | 2.2 | Soft | County estimate |
| Avon | 235.0 | 13.7 | Very hard | County estimate |
| Wappingers Falls | 113.0 | 6.6 | Moderately hard | Utility-reported |
| Albion | 294.0 | 17.2 | Very hard | County estimate |
| Montgomery | 26.2 | 1.5 | Soft | County estimate |
| Highland Falls | 26.2 | 1.5 | Soft | County estimate |
| Marion | 288.0 | 16.8 | Very hard | County estimate |
| Saranac Lake | 15.9 | 0.9 | Soft | County estimate |
| Penn Yan | 368.0 | 21.5 | Very hard | County estimate |
| Mechanicville | 88.3 | 5.2 | Moderately hard | County estimate |
| Harriman | 26.2 | 1.5 | Soft | County estimate |
| Alfred | 86.7 | 5.1 | Moderately hard | County estimate |
| Phelps | 259.0 | 15.2 | Very hard | County estimate |
| Stillwater | 88.3 | 5.2 | Moderately hard | County estimate |
| Coopers Plains | 110.0 | 6.4 | Moderately hard | County estimate |
| Frankfort | 4.7 | 0.3 | Soft | County estimate |
| Ocean Beach | 37.9 | 2.2 | Soft | County estimate |
| Port Ewen | 5.2 | 0.3 | Soft | County estimate |
| Brookhaven | 37.9 | 2.2 | Soft | County estimate |
| Homer | 157.5 | 9.2 | Hard | County estimate |
| Cazenovia | 203.0 | 11.9 | Very hard | County estimate |
| Angola | 170.0 | 9.9 | Hard | County estimate |
| Hudson | 95.2 | 5.6 | Moderately hard | County estimate |
| Corinth | 88.3 | 5.2 | Moderately hard | County estimate |
| Highland | 5.2 | 0.3 | Soft | County estimate |
| West Point | 26.2 | 1.5 | Soft | County estimate |
| Warsaw | 211.0 | 12.3 | Very hard | County estimate |
| Westfield | 143.5 | 8.4 | Hard | County estimate |
| Delhi | 18.4 | 1.1 | Soft | County estimate |
| Mount Morris | 235.0 | 13.7 | Very hard | County estimate |
| Perry | 211.0 | 12.3 | Very hard | County estimate |
| Sidney | 18.4 | 1.1 | Soft | County estimate |
| Warrensburg | 18.2 | 1.1 | Soft | County estimate |
| Palmyra | 288.0 | 16.8 | Very hard | County estimate |
| Whitehall | 108.5 | 6.3 | Moderately hard | County estimate |
| Ticonderoga | 14.9 | 0.9 | Soft | County estimate |
| Bolton Landing | 18.2 | 1.1 | Soft | County estimate |
| Carthage | 62.0 | 3.6 | Moderately hard | County estimate |
| Manchester | 259.0 | 15.2 | Very hard | County estimate |
| Upton | 37.9 | 2.2 | Soft | County estimate |
| Stanley | 259.0 | 15.2 | Very hard | County estimate |
| Geneva | 259.0 | 15.2 | Very hard | County estimate |
| Walton | 18.4 | 1.1 | Soft | County estimate |
| Lee Center | 100.5 | 5.9 | Moderately hard | County estimate |
| Lima | 235.0 | 13.7 | Very hard | County estimate |
| Akron | 170.0 | 9.9 | Hard | County estimate |
| Bliss | 211.0 | 12.3 | Very hard | County estimate |
| Silver Creek | 143.5 | 8.4 | Hard | County estimate |
| Voorheesville | 78.2 | 4.6 | Moderately hard | County estimate |
| Champlain | 62.0 | 3.6 | Moderately hard | County estimate |
| Greenwood Lake | 26.2 | 1.5 | Soft | County estimate |
| Auburn | 201.0 | 11.8 | Very hard | County estimate |
| Shortsville | 259.0 | 15.2 | Very hard | County estimate |
| Blooming Grove | 26.2 | 1.5 | Soft | County estimate |
| Branchport | 368.0 | 21.5 | Very hard | County estimate |
| Clinton | 100.5 | 5.9 | Moderately hard | County estimate |
| Maybrook | 26.2 | 1.5 | Soft | County estimate |
| Mohawk | 4.7 | 0.3 | Soft | County estimate |
| Florida | 26.2 | 1.5 | Soft | County estimate |
| Allegany | 82.4 | 4.8 | Moderately hard | County estimate |
| St. Bonaventure | 82.4 | 4.8 | Moderately hard | County estimate |
| Oakfield | 238.0 | 13.9 | Very hard | County estimate |
| Gowanda | 82.4 | 4.8 | Moderately hard | County estimate |
| Lake George | 18.2 | 1.1 | Soft | County estimate |
| Lewiston | 167.0 | 9.8 | Hard | County estimate |
| Red Hook | 83.8 | 4.9 | Moderately hard | County estimate |
| Peru | 62.0 | 3.6 | Moderately hard | County estimate |
| York | 235.0 | 13.7 | Very hard | County estimate |
| Alden | 170.0 | 9.9 | Hard | County estimate |
| Cold Spring | 76.0 | 4.4 | Moderately hard | County estimate |
| Attica | 211.0 | 12.3 | Very hard | County estimate |
| Schaghticoke | 104.0 | 6.1 | Moderately hard | County estimate |
| Hurley | 5.2 | 0.3 | Soft | County estimate |
| Arcade | 211.0 | 12.3 | Very hard | County estimate |
| Skaneateles | 442.0 | 25.9 | Very hard | County estimate |
| Rouses Point | 62.0 | 3.6 | Moderately hard | County estimate |
| Fishers Island | 37.9 | 2.2 | Soft | County estimate |
| Hadley | 88.3 | 5.2 | Moderately hard | County estimate |
| Lake Luzerne | 18.2 | 1.1 | Soft | County estimate |
| Southold | 37.9 | 2.2 | Soft | County estimate |
| Granville | 108.5 | 6.3 | Moderately hard | County estimate |
| Bedford | 156.0 | 9.1 | Hard | County estimate |
| Belmont | 86.7 | 5.1 | Moderately hard | County estimate |
| Cooperstown | 84.7 | 5.0 | Moderately hard | County estimate |
| Ray Brook | 14.9 | 0.9 | Soft | County estimate |
| Verona | 100.5 | 5.9 | Moderately hard | County estimate |
| Rushville | 368.0 | 21.5 | Very hard | County estimate |
| Canisteo | 110.0 | 6.4 | Moderately hard | County estimate |
| Boonville | 100.5 | 5.9 | Moderately hard | County estimate |
| Canajoharie | 277.0 | 16.2 | Very hard | County estimate |
| Fort Salonga | 70.2 | 4.1 | Moderately hard | Utility-reported |
| Keeseville | 62.0 | 3.6 | Moderately hard | County estimate |
| Newfield | 169.5 | 9.9 | Hard | County estimate |
| Norfolk | 37.6 | 2.2 | Soft | County estimate |
| Northport | 70.2 | 4.1 | Moderately hard | Utility-reported |
| Trumansburg | 169.5 | 9.9 | Hard | County estimate |
| Weedsport | 201.0 | 11.8 | Very hard | County estimate |
| Clyde | 288.0 | 16.8 | Very hard | County estimate |
| Fort Plain | 277.0 | 16.2 | Very hard | County estimate |
| Caledonia | 235.0 | 13.7 | Very hard | County estimate |
| Brewster | 76.0 | 4.4 | Moderately hard | County estimate |
| North Rose | 288.0 | 16.8 | Very hard | County estimate |
| Verplanck | 156.0 | 9.1 | Hard | County estimate |
| Morrisville | 203.0 | 11.9 | Very hard | County estimate |
| Montour Falls | 114.0 | 6.7 | Moderately hard | County estimate |
| Dolgeville | 15.1 | 0.9 | Soft | County estimate |
| Chatham | 95.2 | 5.6 | Moderately hard | County estimate |
| Holley | 294.0 | 17.2 | Very hard | County estimate |
| Watkins Glen | 114.0 | 6.7 | Moderately hard | County estimate |
| Clayton | 62.0 | 3.6 | Moderately hard | County estimate |
| Mexico | 176.0 | 10.3 | Hard | County estimate |
| Pawling | 83.8 | 4.9 | Moderately hard | County estimate |
| Wingdale | 83.8 | 4.9 | Moderately hard | County estimate |
| Deposit | 61.0 | 3.6 | Moderately hard | County estimate |
| Southampton | 85.2 | 5.0 | Moderately hard | Utility-reported |
| Youngstown | 167.0 | 9.8 | Hard | County estimate |
| Adams | 62.0 | 3.6 | Moderately hard | County estimate |
| Adams Center | 62.0 | 3.6 | Moderately hard | County estimate |
| Athens | 13.9 | 0.8 | Soft | County estimate |
| Caneadea | 86.7 | 5.1 | Moderately hard | County estimate |
| Dryden | 169.5 | 9.9 | Hard | County estimate |
| Greenwich | 108.5 | 6.3 | Moderately hard | County estimate |
| Kinderhook | 95.2 | 5.6 | Moderately hard | County estimate |
| Mayville | 143.5 | 8.4 | Hard | County estimate |
| Millerton | 83.8 | 4.9 | Moderately hard | County estimate |
| Union Springs | 201.0 | 11.8 | Very hard | County estimate |
| Valatie | 95.2 | 5.6 | Moderately hard | County estimate |
| Wayland | 110.0 | 6.4 | Moderately hard | County estimate |
| Melrose | 104.0 | 6.1 | Moderately hard | County estimate |
| Moravia | 201.0 | 11.8 | Very hard | County estimate |
| Alexandria Bay | 62.0 | 3.6 | Moderately hard | County estimate |
| Milton | 5.2 | 0.3 | Soft | County estimate |
| Addison | 110.0 | 6.4 | Moderately hard | County estimate |
| West Nyack | 106.0 | 6.2 | Moderately hard | County estimate |
| Downsville | 181.9 | 10.6 | Very hard | Utility-reported |
| Fonda | 277.0 | 16.2 | Very hard | County estimate |
| Sodus | 288.0 | 16.8 | Very hard | County estimate |
| Bloomfield | 259.0 | 15.2 | Very hard | County estimate |
| Cuba | 86.7 | 5.1 | Moderately hard | County estimate |
| Greene | 94.1 | 5.5 | Moderately hard | County estimate |
| Philadelphia | 62.0 | 3.6 | Moderately hard | County estimate |
| Dundee | 368.0 | 21.5 | Very hard | County estimate |
| Franklinville | 82.4 | 4.8 | Moderately hard | County estimate |
| Philmont | 95.2 | 5.6 | Moderately hard | County estimate |
| Waterville | 100.5 | 5.9 | Moderately hard | County estimate |
| Oxford | 94.1 | 5.5 | Moderately hard | County estimate |
| Randolph | 82.4 | 4.8 | Moderately hard | County estimate |
| St. Johnsville | 15.1 | 0.9 | Soft | County estimate |
| Norwood | 37.6 | 2.2 | Soft | County estimate |
| Holland | 170.0 | 9.9 | Hard | County estimate |
| Lowville | 11.1 | 0.7 | Soft | County estimate |
| Castile | 211.0 | 12.3 | Very hard | County estimate |
| Black River | 62.0 | 3.6 | Moderately hard | County estimate |
| Mahopac | 70.8 | 4.1 | Moderately hard | Utility-reported |
| Nunda | 235.0 | 13.7 | Very hard | County estimate |
| Willsboro | 14.9 | 0.9 | Soft | County estimate |
| Bainbridge | 94.1 | 5.5 | Moderately hard | County estimate |
| Sherburne | 94.1 | 5.5 | Moderately hard | County estimate |
| Elbridge | 442.0 | 25.9 | Very hard | County estimate |
| Cape Vincent | 62.0 | 3.6 | Moderately hard | County estimate |
| Ellisburg | 62.0 | 3.6 | Moderately hard | County estimate |
| New Berlin | 84.7 | 5.0 | Moderately hard | County estimate |
| Sodus Point | 288.0 | 16.8 | Very hard | County estimate |
| Sonyea | 235.0 | 13.7 | Very hard | County estimate |
| Wallkill | 5.2 | 0.3 | Soft | County estimate |
| Broadalbin | 15.1 | 0.9 | Soft | County estimate |
| Ellicottville | 82.4 | 4.8 | Moderately hard | County estimate |
| Gansevoort | 88.3 | 5.2 | Moderately hard | County estimate |
| Lyndonville | 294.0 | 17.2 | Very hard | County estimate |
| Cairo | 13.9 | 0.8 | Soft | County estimate |
| Jordan | 442.0 | 25.9 | Very hard | County estimate |
| Friendship | 86.7 | 5.1 | Moderately hard | County estimate |
| Burdett | 114.0 | 6.7 | Moderately hard | County estimate |
| Tivoli | 83.8 | 4.9 | Moderately hard | County estimate |
| Morrisonville | 62.0 | 3.6 | Moderately hard | County estimate |
| Ripley | 143.5 | 8.4 | Hard | County estimate |
| Schuylerville | 88.3 | 5.2 | Moderately hard | County estimate |
| Stamford | 125.0 | 7.3 | Hard | County estimate |
| Wurtsboro | 11.5 | 0.7 | Soft | County estimate |
| Westmoreland | 100.5 | 5.9 | Moderately hard | County estimate |
| Naples | 259.0 | 15.2 | Very hard | County estimate |
| Star Lake | 37.6 | 2.2 | Soft | County estimate |
| New City | 106.0 | 6.2 | Moderately hard | County estimate |
| Valley Cottage | 106.0 | 6.2 | Moderately hard | County estimate |
| Brownville | 62.0 | 3.6 | Moderately hard | County estimate |
| Richfield Springs | 84.7 | 5.0 | Moderately hard | County estimate |
| Stormville | 83.8 | 4.9 | Moderately hard | County estimate |
| Little Valley | 82.4 | 4.8 | Moderately hard | County estimate |
| Cattaraugus | 82.4 | 4.8 | Moderately hard | County estimate |
| Hancock | 18.4 | 1.1 | Soft | County estimate |
| Lagrangeville | 83.8 | 4.9 | Moderately hard | County estimate |
| Orangeburg | 106.0 | 6.2 | Moderately hard | County estimate |
| Andover | 86.7 | 5.1 | Moderately hard | County estimate |
| Marathon | 157.5 | 9.2 | Hard | County estimate |
| Portville | 86.7 | 5.1 | Moderately hard | County estimate |
| Brighton | 98.2 | 5.7 | Moderately hard | Utility-reported |
| Chateaugay | 15.9 | 0.9 | Soft | County estimate |
| Dexter | 62.0 | 3.6 | Moderately hard | County estimate |
| North Creek | 18.2 | 1.1 | Soft | County estimate |
| Paul Smiths | 98.2 | 5.7 | Moderately hard | Utility-reported |
| Tuxedo Park | 25.0 | 1.5 | Soft | Utility-reported |
| Delevan | 82.4 | 4.8 | Moderately hard | County estimate |
| Otisville | 26.2 | 1.5 | Soft | County estimate |
| Nassau | 104.0 | 6.1 | Moderately hard | County estimate |
| Whitney Point | 61.0 | 3.6 | Moderately hard | County estimate |
| Windsor | 61.0 | 3.6 | Moderately hard | County estimate |
| Hunter | 13.9 | 0.8 | Soft | County estimate |
| Westport | 14.9 | 0.9 | Soft | County estimate |
| Otego | 84.7 | 5.0 | Moderately hard | County estimate |
| Amenia | 83.8 | 4.9 | Moderately hard | County estimate |
| Clifton Springs | 259.0 | 15.2 | Very hard | County estimate |
| Glenwood Landing | 53.5 | 3.1 | Soft | County estimate |
| Hillburn | 106.0 | 6.2 | Moderately hard | County estimate |
| Livingston Manor | 11.5 | 0.7 | Soft | County estimate |
| Northville | 4.6 | 0.3 | Soft | County estimate |
| Norwich | 94.1 | 5.5 | Moderately hard | County estimate |
| Leicester | 235.0 | 13.7 | Very hard | County estimate |
| Keene | 14.9 | 0.9 | Soft | County estimate |
| Savannah | 288.0 | 16.8 | Very hard | County estimate |
| Waddington | 37.6 | 2.2 | Soft | County estimate |
| Jamestown | 143.5 | 8.4 | Hard | County estimate |
| Canaseraga | 86.7 | 5.1 | Moderately hard | County estimate |
| Fort Covington | 15.9 | 0.9 | Soft | County estimate |
| Elizabethtown | 14.9 | 0.9 | Soft | County estimate |
| Copenhagen | 11.1 | 0.7 | Soft | County estimate |
| Prattsburgh | 110.0 | 6.4 | Moderately hard | County estimate |
| Silver Springs | 211.0 | 12.3 | Very hard | County estimate |
| Arkport | 110.0 | 6.4 | Moderately hard | County estimate |
| Heuvelton | 37.6 | 2.2 | Soft | County estimate |
| Mayfield | 15.1 | 0.9 | Soft | County estimate |
| Forestville | 143.5 | 8.4 | Hard | County estimate |
| Madrid | 37.6 | 2.2 | Soft | County estimate |
| Slingerlands | 78.2 | 4.6 | Moderately hard | County estimate |
| Alexander | 238.0 | 13.9 | Very hard | County estimate |
| Beaver Falls | 11.1 | 0.7 | Soft | County estimate |
| Sinclairville | 143.5 | 8.4 | Hard | County estimate |
| Cassadaga | 143.5 | 8.4 | Hard | County estimate |
| Poestenkill | 104.0 | 6.1 | Moderately hard | County estimate |
| Chestertown | 18.2 | 1.1 | Soft | County estimate |
| Fultonville | 277.0 | 16.2 | Very hard | County estimate |
| Round Lake | 88.3 | 5.2 | Moderately hard | County estimate |
| Hammondsport | 110.0 | 6.4 | Moderately hard | County estimate |
| Dresden | 368.0 | 21.5 | Very hard | County estimate |
| Elba | 238.0 | 13.9 | Very hard | County estimate |
| Chazy | 62.0 | 3.6 | Moderately hard | County estimate |
| Oriskany Falls | 100.5 | 5.9 | Moderately hard | County estimate |
| Carmel | 76.0 | 4.4 | Moderately hard | County estimate |
| South Dayton | 82.4 | 4.8 | Moderately hard | County estimate |
| Altona | 62.0 | 3.6 | Moderately hard | County estimate |
| Franklin | 18.4 | 1.1 | Soft | County estimate |
| Munnsville | 203.0 | 11.9 | Very hard | County estimate |
| Saratoga Springs | 88.3 | 5.2 | Moderately hard | County estimate |
| Perrysburg | 82.4 | 4.8 | Moderately hard | County estimate |
| Wellsburg | 128.0 | 7.5 | Hard | County estimate |
| Newark | 135.0 | 7.9 | Hard | Utility-reported |
| Fort Ann | 108.5 | 6.3 | Moderately hard | County estimate |
| Shelter Island | 37.9 | 2.2 | Soft | County estimate |
| Almond | 86.7 | 5.1 | Moderately hard | County estimate |
| Saranac | 62.0 | 3.6 | Moderately hard | County estimate |
| Lisbon | 37.6 | 2.2 | Soft | County estimate |
| Wyoming | 211.0 | 12.3 | Very hard | County estimate |
| Shelter Island Heights | 37.9 | 2.2 | Soft | County estimate |
| Deansboro | 100.5 | 5.9 | Moderately hard | County estimate |
| Parishville | 37.6 | 2.2 | Soft | County estimate |
| Worcester | 84.7 | 5.0 | Moderately hard | County estimate |
| Clayville | 4.7 | 0.3 | Soft | County estimate |
| Burke | 15.9 | 0.9 | Soft | County estimate |
| Springwater | 259.0 | 15.2 | Very hard | County estimate |
| Deferiet | 62.0 | 3.6 | Moderately hard | County estimate |
| Farnham | 170.0 | 9.9 | Hard | County estimate |
| Putnam Valley | 76.0 | 4.4 | Moderately hard | County estimate |
| Morristown | 37.6 | 2.2 | Soft | County estimate |
| Lyon Mountain | 62.0 | 3.6 | Moderately hard | County estimate |
| Laurens | 84.7 | 5.0 | Moderately hard | County estimate |
| Calverton | 37.9 | 2.2 | Soft | County estimate |
| Willard | 218.5 | 12.8 | Very hard | County estimate |
| Ellenville | 72.2 | 4.2 | Moderately hard | Utility-reported |
| Castorland | 11.1 | 0.7 | Soft | County estimate |
| Evans Mills | 62.0 | 3.6 | Moderately hard | County estimate |
| Little Falls | 4.7 | 0.3 | Soft | County estimate |
| Brooklyn | 81.0 | 4.7 | Moderately hard | County estimate |
| Millport | 128.0 | 7.5 | Hard | County estimate |
| West Oneonta | 84.7 | 5.0 | Moderately hard | County estimate |
| Greenwood | 110.0 | 6.4 | Moderately hard | County estimate |
| Highland Mills | 26.2 | 1.5 | Soft | County estimate |
| Manorville | 37.9 | 2.2 | Soft | County estimate |
| Freeville | 169.5 | 9.9 | Hard | County estimate |
| Rock Hill | 11.5 | 0.7 | Soft | County estimate |
| Rye | 156.0 | 9.1 | Hard | County estimate |
| Pomona | 106.0 | 6.2 | Moderately hard | County estimate |
| Sandy Creek | 176.0 | 10.3 | Hard | County estimate |
| Essex | 14.9 | 0.9 | Soft | County estimate |
| Stony Point | 106.0 | 6.2 | Moderately hard | County estimate |
| Lake Katrine | 5.2 | 0.3 | Soft | County estimate |
| Wilmington | 14.9 | 0.9 | Soft | County estimate |
| Rush | 269.0 | 15.7 | Very hard | County estimate |
| Treadwell | 18.4 | 1.1 | Soft | County estimate |
| Moira | 15.9 | 0.9 | Soft | County estimate |
| Canton | 37.6 | 2.2 | Soft | County estimate |
| Fishs Eddy | 18.4 | 1.1 | Soft | County estimate |
| Madison | 203.0 | 11.9 | Very hard | County estimate |
| West Hurley | 5.2 | 0.3 | Soft | County estimate |
| Delmar | 78.2 | 4.6 | Moderately hard | County estimate |
| Pittsford | 269.0 | 15.7 | Very hard | County estimate |
| Brookfield | 203.0 | 11.9 | Very hard | County estimate |
| Pelham | 21.6 | 1.3 | Soft | Utility-reported |
| Rock Tavern | 26.2 | 1.5 | Soft | County estimate |
| Guilderland | 78.2 | 4.6 | Moderately hard | County estimate |
| Pennellville | 176.0 | 10.3 | Hard | County estimate |
| Speculator | 4.6 | 0.3 | Soft | County estimate |
| East Chatham | 95.2 | 5.6 | Moderately hard | County estimate |
| Fort Johnson | 277.0 | 16.2 | Very hard | County estimate |
| Pine Valley | 128.0 | 7.5 | Hard | County estimate |
| Dewittville | 143.5 | 8.4 | Hard | County estimate |
| Unadilla | 84.7 | 5.0 | Moderately hard | County estimate |
| Port Byron | 201.0 | 11.8 | Very hard | County estimate |
| Woodstock | 5.2 | 0.3 | Soft | County estimate |
| Accord | 5.2 | 0.3 | Soft | County estimate |
| East Rochester | 269.0 | 15.7 | Very hard | County estimate |
| Altamont | 78.2 | 4.6 | Moderately hard | County estimate |
| Croton Falls | 156.0 | 9.1 | Hard | County estimate |
| Sauquoit | 100.5 | 5.9 | Moderately hard | County estimate |
| South New Berlin | 84.7 | 5.0 | Moderately hard | County estimate |
| Modena | 5.2 | 0.3 | Soft | County estimate |
| Vestal | 61.0 | 3.6 | Moderately hard | County estimate |
| Berkshire | 96.7 | 5.7 | Moderately hard | County estimate |
| Alfred Station | 86.7 | 5.1 | Moderately hard | County estimate |
| Preble | 157.5 | 9.2 | Hard | County estimate |
| Groton | 169.5 | 9.9 | Hard | County estimate |
| Kerhonkson | 5.2 | 0.3 | Soft | County estimate |
| Rocky Point | 37.9 | 2.2 | Soft | County estimate |
| Somers | 156.0 | 9.1 | Hard | County estimate |
| Oriskany | 100.5 | 5.9 | Moderately hard | County estimate |
| Ava | 100.5 | 5.9 | Moderately hard | County estimate |
| Selkirk | 78.2 | 4.6 | Moderately hard | County estimate |
| Vernon | 100.5 | 5.9 | Moderately hard | County estimate |
| Cambridge | 108.5 | 6.3 | Moderately hard | County estimate |
| Colden | 170.0 | 9.9 | Hard | County estimate |
| Central Valley | 26.2 | 1.5 | Soft | County estimate |
| Rensselaer Falls | 37.6 | 2.2 | Soft | County estimate |
| Spring Valley | 106.0 | 6.2 | Moderately hard | County estimate |
| Glenmont | 78.2 | 4.6 | Moderately hard | County estimate |
| Barker | 167.0 | 9.8 | Hard | County estimate |
| Cleveland | 100.5 | 5.9 | Moderately hard | County estimate |
| Collins | 170.0 | 9.9 | Hard | County estimate |
| Cottekill | 5.2 | 0.3 | Soft | County estimate |
| Frewsburg | 143.5 | 8.4 | Hard | County estimate |
| Napanoch | 5.2 | 0.3 | Soft | County estimate |
| Newark Valley | 96.7 | 5.7 | Moderately hard | County estimate |
| Old Forge | 4.7 | 0.3 | Soft | County estimate |
| Ovid | 218.5 | 12.8 | Very hard | County estimate |
| Patterson | 76.0 | 4.4 | Moderately hard | County estimate |
| Port Crane | 61.0 | 3.6 | Moderately hard | County estimate |
| Richmondville | 125.0 | 7.3 | Hard | County estimate |
| Schroon Lake | 14.9 | 0.9 | Soft | County estimate |
Above 120 mg/L (7 gpg), scale is usually worth treating — see our water softener guide, or size a system with the hardness calculator & converter.
The Geology Behind New York's Water Hardness
New York sits in the Appalachian and Mid-Atlantic mixed terrain region.
The Mid-Atlantic and Appalachian states sit on a patchwork of sandstone, shale, and crystalline rock that yields mostly soft to moderately hard water. The big exception is the region's limestone and dolomite valleys - including the carbonate belt running from Pennsylvania down through the Shenandoah Valley - where groundwater dissolves calcium and magnesium readily and comes out distinctly hard. A city's number here depends heavily on whether its supply draws from upland rivers and reservoirs or from carbonate-valley wells.
New York Water Hardness FAQ
Does New York have hard water?
On the whole, no — New York's statewide median sits below the hard threshold, though some cities run harder. The median is 55.3 mg/L (3.2 gpg) — soft on the USGS scale, where anything above 120 mg/L (7 gpg) counts as hard. 16 of New York's 242 measured cities fall in the hard or very hard bands (7%), so check your own city rather than the state average.
How hard is tap water in New York?
Across the 242 New York cities with measured values in our index, the median hardness is 55.3 mg/L (3.2 gpg) — soft on the USGS scale. Individual cities range from 6.1 to 211.0 mg/L, so check your own city rather than assuming the state number.
Which city in New York has the hardest water?
Niskayuna has the hardest measured tap water in our New York index at 211.0 mg/L (12.3 gpg) — very hard on the USGS scale. Rankings use measured utility values only; labeled county estimates and values under active dispute are excluded.
Do I need a water softener in New York?
16 of New York's 242 measured cities (7%) fall in the hard or very hard bands — above 120 mg/L (7 gpg), the level where most water treatment professionals suggest considering an ion-exchange softener. Hardness varies utility to utility, so look up your own city's value before sizing equipment.
How do I find my city's exact water hardness?
Enter your ZIP code in our free lookup at tapwaterdata.com/zip to see the value we hold for your New York city from utility-reported water quality data, check your water utility's annual Consumer Confidence Report (CCR), or use a home test-strip kit.
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