Colorado Water Quality Reports
Comprehensive water quality data for 307 cities across Colorado. View EPA-verified contaminant levels and get filter recommendations.
307
Cities
11
Safe
127
Monitor
169
At Risk
Water Quality by County
Explore aggregated water quality scores across Colorado counties. Scores are calculated based on EPA data and weighted by population.
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Data from 285 cities serving 61,775,854 people across 49 counties.
Common Contaminants in Colorado
296 cities in Colorado have at least one contaminant above EPA health guidelines.
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Upload my testCities in Colorado
Aurora
People Served1842K
Contaminants Tested520
Above Guidelines18
View Report β
Twin Lakes
People Served1498K
Contaminants Tested255
Above Guidelines9
View Report β
Westminster
People Served1481K
Contaminants Tested268
Above Guidelines12
View Report β
Sherrelwood
People Served1480K
Contaminants Tested255
Above Guidelines9
View Report β
Arvada
People Served1458K
Contaminants Tested358
Above Guidelines10
View Report β
Inverness
People Served1453K
Contaminants Tested645
Above Guidelines20
View Report β
Denver
People Served1452K
Contaminants Tested615
Above Guidelines22
View Report β
Thornton
People Served1446K
Contaminants Tested297
Above Guidelines12
View Report β
Centennial
People Served1445K
Contaminants Tested612
Above Guidelines23
View Report β
Dove Valley
People Served1426K
Contaminants Tested517
Above Guidelines18
View Report β
Lakewood
People Served1410K
Contaminants Tested225
Above Guidelines5
View Report β
Sheridan
People Served1374K
Contaminants Tested387
Above Guidelines12
View Report β
Englewood
People Served1374K
Contaminants Tested263
Above Guidelines8
View Report β
Edgewater
People Served1356K
Contaminants Tested134
Above Guidelines2
View Report β
Commerce City
People Served1356K
Contaminants Tested262
Above Guidelines9
View Report β
Four Square Mile
People Served1353K
Contaminants Tested263
Above Guidelines9
View Report β
Glendale
People Served1353K
Contaminants Tested263
Above Guidelines9
View Report β
Holly Hills
People Served1353K
Contaminants Tested263
Above Guidelines9
View Report β
Cherry Creek
People Served1352K
Contaminants Tested386
Above Guidelines13
View Report β
Greenwood Village
People Served1352K
Contaminants Tested386
Above Guidelines13
View Report β
Wheat Ridge
People Served1333K
Contaminants Tested396
Above Guidelines12
View Report β
Bow Mar
People Served1324K
Contaminants Tested147
Above Guidelines4
View Report β
Littleton
People Served1323K
Contaminants Tested147
Above Guidelines4
View Report β
Acres Green
People Served1321K
Contaminants Tested259
Above Guidelines6
View Report β
Lone Tree
People Served1321K
Contaminants Tested259
Above Guidelines6
View Report β
Applewood
People Served1317K
Contaminants Tested224
Above Guidelines5
View Report β
Fairmount
People Served1311K
Contaminants Tested224
Above Guidelines5
View Report β
Highlands Ranch
People Served1306K
Contaminants Tested258
Above Guidelines3
View Report β
Cherry Hills Village
People Served1306K
Contaminants Tested134
Above Guidelines2
View Report β
Morrison
People Served1303K
Contaminants Tested259
Above Guidelines4
View Report β
Meridian
People Served1302K
Contaminants Tested259
Above Guidelines6
View Report β
North Washington
People Served1302K
Contaminants Tested134
Above Guidelines2
View Report β
Ken Caryl
People Served1299K
Contaminants Tested134
Above Guidelines2
View Report β
Dakota Ridge
People Served1296K
Contaminants Tested222
Above Guidelines3
View Report β
Columbine Valley
People Served1293K
Contaminants Tested147
Above Guidelines4
View Report β
Mountain View
People Served1287K
Contaminants Tested258
Above Guidelines8
View Report β
Berkley
People Served1287K
Contaminants Tested134
Above Guidelines2
View Report β
Columbine
People Served1287K
Contaminants Tested134
Above Guidelines2
View Report β
Lakeside
People Served1287K
Contaminants Tested134
Above Guidelines2
View Report β
Roxborough Park
People Served1287K
Contaminants Tested134
Above Guidelines2
View Report β
Welby
People Served1287K
Contaminants Tested134
Above Guidelines2
View Report β
Stratmoor
People Served487K
Contaminants Tested254
Above Guidelines10
View Report β
Colorado Springs
People Served465K
Contaminants Tested249
Above Guidelines5
View Report β
Cimarron Hills
People Served464K
Contaminants Tested128
Above Guidelines3
View Report β
Fort Collins
People Served268K
Contaminants Tested158
Above Guidelines6
View Report β
Northglenn
People Served205K
Contaminants Tested231
Above Guidelines7
View Report β
Shaw Heights
People Served193K
Contaminants Tested121
Above Guidelines7
View Report β
Laporte
People Served180K
Contaminants Tested130
Above Guidelines2
View Report β
Federal Heights
People Served173K
Contaminants Tested329
Above Guidelines22
View Report β
Boulder
People Served166K
Contaminants Tested133
Above Guidelines2
View Report β
Loveland
People Served119K
Contaminants Tested140
Above Guidelines4
View Report β
Garden City
People Served116K
Contaminants Tested144
Above Guidelines4
View Report β
Greeley
People Served116K
Contaminants Tested144
Above Guidelines4
View Report β
Pueblo
People Served114K
Contaminants Tested254
Above Guidelines8
View Report β
Broomfield
People Served106K
Contaminants Tested134
Above Guidelines2
View Report β
Longmont
People Served105K
Contaminants Tested200
Above Guidelines5
View Report β
Castle Rock
People Served105K
Contaminants Tested252
Above Guidelines9
View Report β
Fruita
People Served89K
Contaminants Tested96
Above Guidelines2
View Report β
Parker
People Served86K
Contaminants Tested382
Above Guidelines14
View Report β
Derby
People Served71K
Contaminants Tested252
Above Guidelines8
View Report β
Fort Carson
People Served70K
Contaminants Tested139
Above Guidelines9
View Report β
Security-Widefield
People Served68K
Contaminants Tested384
Above Guidelines19
View Report β
Timnath
People Served64K
Contaminants Tested14
Above Guidelines2
View Report β
Clifton
People Served61K
Contaminants Tested205
Above Guidelines6
View Report β
Fruitvale
People Served61K
Contaminants Tested192
Above Guidelines4
View Report β
Grand Junction
People Served61K
Contaminants Tested192
Above Guidelines4
View Report β
Stepping Stone
People Served60K
Contaminants Tested129
Above Guidelines6
View Report β
Brighton
People Served55K
Contaminants Tested125
Above Guidelines6
View Report β
Golden
People Served54K
Contaminants Tested217
Above Guidelines8
View Report β
West Pleasant View
People Served54K
Contaminants Tested217
Above Guidelines8
View Report β
Silver Cliff
People Served53K
Contaminants Tested727
Above Guidelines30
View Report β
Vail
People Served52K
Contaminants Tested121
Above Guidelines3
View Report β
Fountain
People Served48K
Contaminants Tested254
Above Guidelines13
View Report β
Palisade
People Served38K
Contaminants Tested222
Above Guidelines4
View Report β
Snowmass Village
People Served37K
Contaminants Tested252
Above Guidelines8
View Report β
CaΓ±on City
People Served35K
Contaminants Tested126
Above Guidelines6
View Report β
Canon City
People Served35K
Contaminants Tested126
Above Guidelines6
View Report β
Lincoln Park
People Served35K
Contaminants Tested126
Above Guidelines6
View Report β
Erie
People Served33K
Contaminants Tested125
Above Guidelines2
View Report β
Pueblo West
People Served30K
Contaminants Tested128
Above Guidelines5
View Report β
Lafayette
People Served30K
Contaminants Tested227
Above Guidelines7
View Report β
Berthoud
People Served29K
Contaminants Tested157
Above Guidelines8
View Report β
Breckenridge
People Served28K
Contaminants Tested118
Above Guidelines5
View Report β
Firestone
People Served28K
Contaminants Tested26
Above Guidelines4
View Report β
Evans
People Served27K
Contaminants Tested26
Above Guidelines4
View Report β
Delta
People Served27K
Contaminants Tested860
Above Guidelines20
View Report β
Orchard Mesa
People Served26K
Contaminants Tested95
Above Guidelines2
View Report β
Redlands
People Served26K
Contaminants Tested95
Above Guidelines2
View Report β
Blanca
People Served24K
Contaminants Tested2496
Above Guidelines72
View Report β
The Pinery
People Served24K
Contaminants Tested255
Above Guidelines11
View Report β
Windsor
People Served24K
Contaminants Tested13
Above Guidelines2
View Report β
Black Forest
People Served23K
Contaminants Tested127
Above Guidelines7
View Report β
Woodmoor
People Served23K
Contaminants Tested251
Above Guidelines9
View Report β
Louisville
People Served22K
Contaminants Tested110
Above Guidelines7
View Report β
Mead
People Served22K
Contaminants Tested13
Above Guidelines2
View Report β
Niwot
People Served21K
Contaminants Tested127
Above Guidelines5
View Report β
Paragon Estates
People Served21K
Contaminants Tested97
Above Guidelines5
View Report β
Montrose
People Served20K
Contaminants Tested151
Above Guidelines6
View Report β
Johnstown
People Served19K
Contaminants Tested131
Above Guidelines2
View Report β
Falcon
People Served19K
Contaminants Tested496
Above Guidelines15
View Report β
Showing top 100 of 307 cities by population.
Use the search box above to find any city in Colorado.
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