California Tap Water Quality Report
No test results on file for California's own water system: EPA's records place none of the systems listed on this page in California. Results from other water systems on this page are listed under each system's name; they do not make a verdict for California. Check your water utility's latest Consumer Confidence Report for its current test results.
Other systems listed for California with results above guidelines: COUNTRY LAKES (1 above guidelines), CEDAR COVE (1 above guidelines), PATUXENT NAVAL AIR STATION (NAVFAC-WASH) (1 above guidelines)
Water system
Not identified
EPA's records place none of the systems on this page in California.
7 other systems are listed for California. See their figures
Health-based violations since 2020
No EPA violation record on file
Is California Tap Water Safe to Drink?
Everything we hold on California's water is below — a thin record, not a clean one. Testing your own water is the way to find out what your tap is actually delivering.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in Maryland
California Water Service Areas
Fluoride in California's water
The 5 largest of the 7 water systems serving California, by population served.
PATUXENT NAVAL AIR STATION (NAVFAC-WASH)
PWSID MD0180022
PATUXENT NAVAL AIR STATION (NAVFAC-WASH) reported 0.55 mg/L, below the 0.7 mg/L U.S. Public Health Service recommendation.
COUNTRY LAKES
PWSID MD0180023
COUNTRY LAKES reported 0.2 mg/L, below the 0.7 mg/L U.S. Public Health Service recommendation.
CEDAR COVE
PWSID MD0180002
CEDAR COVE reported 0.56 mg/L, below the 0.7 mg/L U.S. Public Health Service recommendation.
WICOMICO SHORES
PWSID MD0180018
WICOMICO SHORES reported 0.485 mg/L, below the 0.7 mg/L U.S. Public Health Service recommendation.
BRETON BAY
PWSID MD0180001
BRETON BAY reported 0.82 mg/L, at or above the 0.7 mg/L U.S. Public Health Service recommendation and below the 1.5 mg/L WHO guideline value and NTP neurodevelopment review level.
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General-Purpose Water Filters for California
No test results are on file for California's own water system, so these are general-purpose NSF/ANSI 53 certified filters, not chosen for any contaminant.
Pentair Residential Filtration, LLC
Everpure Residential H-300-NXT
NSF Certified:
Capacity
3001 gal
Filter Life
10 mo
Flow Rate
0.5 gpm
Removes 5 contaminants:
Whirlpool Corporation
W11256135
NSF Certified:
Capacity
1001 gal
Filter Life
3 mo
Flow Rate
0.7 gpm
Removes 19 contaminants:
+14 more
Benzene, Carbofuran, Chlorine (Free), Chlorine (Total), Chlorine Dioxide, Chlorobenzene, Cryptosporidium, Ethylbenzene, Lead, Mercury, Metolachlor, Tetrachloroethylene, Toxaphene, Turbidity
Whirlpool Corporation
W11569861
NSF Certified:
Capacity
1001 gal
Filter Life
3 mo
Flow Rate
0.52 gpm
Removes 22 contaminants:
+17 more
Atrazine, Benzene, Carbofuran, Chlorine (Free), Chlorine (Total), Chlorine Dioxide, Chlorobenzene, Cryptosporidium, Ethylbenzene, Lead, Mercury, Metolachlor, Styrene, Tetrachloroethylene, Toxaphene, Trichloroethylene, Turbidity
Santevia
Bath Filter
NSF Certified:
Flow Rate
0.36 gpm
Highlights:
- Organic cotton design reduces plastic used in construction
- Affordable upfront & ongoing cost
- The only bath filter that removed 100% chlorine with “normal” faster faucet flow
Removes 1 contaminants:
No test results on file — test your own tap
We don't hold water-quality results for this system yet, so nobody can tell you what is in your water from published data. A certified lab test is the way to find out.
SimpleLab
Advanced Home Water Test
$269
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
Tap Score
Advanced Microplastics Test
$829
Cutting-edge testing for microplastics particles in drinking water using advanced laboratory techniques.
Tap Score
Haloacetic Acids (HAA9) Test
$275
Tests for disinfection byproducts formed when chlorine reacts with organic matter in water treatment.
What California's water readings can explain
We publish a city-level hardness figure for California, resolved from its water systems where they report one and estimated from county sampling where they do not. Each page starts with the hot-tap and cold-tap check, then shows what your own water system reported.
On a private well near California? Public-water results do not apply to private wells. See St. Mary's County well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Water softener cost and installation in California
California's tap water has an estimated 0.3 grains per gallon (5.7 mg/L, county sampling in St. Mary's County) — soft on the USGS scale, below the range where scale is usually worth treating.
Water softener cost for an estimated 0.3 gpg water in California — equipment and local installation labour for your ZIP code, with the sizing arithmetic shown in full. For the national picture first, read what a water softener costs — equipment, installation labour and ten-year ownership, each separated out. For Maryland as a whole, read water softener cost in Maryland — priced against the plumber wage published for the state.
Frequently Asked Questions About California Tap Water
No test results on file for California's own water system: EPA's records place none of the systems listed on this page in California. Results from other water systems on this page are listed under each system's name; they do not make a verdict for California. Check your water utility's latest Consumer Confidence Report for its current test results.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach your water utility. For a problem with your water now (discolored water, no water, low pressure, a leak), contact your water utility directly.
Check another location
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