Colorado County Water Quality Reports

Adams County, CO: 10 Health Violations — 60/100 (2026)

2026 report: Adams County, CO scores 60/100 (Grade C). 28 ZIP codes analyzed. 176 EPA violations found. Free report with contaminant data and filter picks.

Alamosa County, CO: 40 Violations — 64/100 (2026)

2026 report: Alamosa County, CO scores 64/100 (Grade C). 3 ZIP codes analyzed. 40 EPA violations found. Free report with contaminant data and filter picks.

Arapahoe County, CO: 7 Health Violations — 60/100 (2026)

2026 report: Arapahoe County, CO scores 60/100 (Grade C). 31 ZIP codes analyzed. 240 EPA violations found. Free report with contaminant data and filter ...

Archuleta County, CO: 26 Violations — 79/100 (2026)

2026 report: Archuleta County, CO scores 79/100 (Grade B). 3 ZIP codes analyzed. 26 EPA violations found. Free report with contaminant data and filter p...

Baca County, CO: 26 Health Violations — 54/100 (2026)

2026 report: Baca County, CO scores 54/100 (Grade D). 6 ZIP codes analyzed. 61 EPA violations found. Free report with contaminant data and filter picks.

Bent County, CO: 12 Health Violations — 46/100 (2026)

2026 report: Bent County, CO scores 46/100 (Grade D). 3 ZIP codes analyzed. 17 EPA violations found. Free report with contaminant data and filter picks.

Boulder County, CO: 47 Health Violations — 59/100 (2026)

2026 report: Boulder County, CO scores 59/100 (Grade C). 33 ZIP codes analyzed. 276 EPA violations found. Free report with contaminant data and filter p...

Broomfield County, CO: 3 Health Violations — 66/100 (2026)

2026 report: Broomfield County, CO scores 66/100 (Grade C). 3 ZIP codes analyzed. 6 EPA violations found. Free report with contaminant data and filter p...

Chaffee County, CO: 2 Health Violations — 55/100 (2026)

2026 report: Chaffee County, CO scores 55/100 (Grade C). 10 ZIP codes analyzed. 43 EPA violations found. Free report with contaminant data and filter pi...

Cheyenne County, CO: 5 Violations — 57/100 (2026)

2026 report: Cheyenne County, CO scores 57/100 (Grade C). 3 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter picks.

Clear Creek County, CO: 3 Health Violations — 66/100 (2026)

2026 report: Clear Creek County, CO scores 66/100 (Grade C). 5 ZIP codes analyzed. 24 EPA violations found. Free report with contaminant data and filter...

Conejos County, CO: 3 Health Violations — 78/100 (2026)

2026 report: Conejos County, CO scores 78/100 (Grade B). 6 ZIP codes analyzed. 65 EPA violations found. Free report with contaminant data and filter picks.

Costilla County, CO: 2 Health Violations — 71/100 (2026)

2026 report: Costilla County, CO scores 71/100 (Grade B). 7 ZIP codes analyzed. 11 EPA violations found. Free report with contaminant data and filter pi...

Crowley County, CO: 17 Violations — 55/100 (2026)

2026 report: Crowley County, CO scores 55/100 (Grade C). 5 ZIP codes analyzed. 17 EPA violations found. Free report with contaminant data and filter picks.

Custer County, CO: 14 Violations — 53/100 (2026)

2026 report: Custer County, CO scores 53/100 (Grade D). 3 ZIP codes analyzed. 14 EPA violations found. Free report with contaminant data and filter picks.

Delta County, CO: 25 Health Violations — 55/100 (2026)

2026 report: Delta County, CO scores 55/100 (Grade C). 8 ZIP codes analyzed. 164 EPA violations found. Free report with contaminant data and filter picks.

Denver County, CO: 165 Violations — 66/100 (2026)

2026 report: Denver County, CO scores 66/100 (Grade C). 55 ZIP codes analyzed. 165 EPA violations found. Free report with contaminant data and filter pi...

Dolores County, CO: 6 Health Violations — 46/100 (2026)

2026 report: Dolores County, CO scores 46/100 (Grade D). 5 ZIP codes analyzed. 20 EPA violations found. Free report with contaminant data and filter picks.

Douglas County, CO: 5 Health Violations — 65/100 (2026)

2026 report: Douglas County, CO scores 65/100 (Grade C). 13 ZIP codes analyzed. 56 EPA violations found. Free report with contaminant data and filter pi...

Eagle County, CO: 7 Health Violations — 68/100 (2026)

2026 report: Eagle County, CO scores 68/100 (Grade C). 13 ZIP codes analyzed. 27 EPA violations found. Free report with contaminant data and filter picks.

El Paso County, CO: 11 Health Violations — 61/100 (2026)

2026 report: El Paso County, CO scores 61/100 (Grade C). 67 ZIP codes analyzed. 233 EPA violations found. Free report with contaminant data and filter p...

Elbert County, CO: 3 Health Violations — 62/100 (2026)

2026 report: Elbert County, CO scores 62/100 (Grade C). 6 ZIP codes analyzed. 31 EPA violations found. Free report with contaminant data and filter picks.

Fremont County, CO: 2 Health Violations — 60/100 (2026)

2026 report: Fremont County, CO scores 60/100 (Grade C). 8 ZIP codes analyzed. 56 EPA violations found. Free report with contaminant data and filter picks.

Garfield County, CO: 5 Health Violations — 60/100 (2026)

2026 report: Garfield County, CO scores 60/100 (Grade C). 8 ZIP codes analyzed. 110 EPA violations found. Free report with contaminant data and filter p...

Gilpin County, CO: 16 Violations — 64/100 (2026)

2026 report: Gilpin County, CO scores 64/100 (Grade C). 2 ZIP codes analyzed. 16 EPA violations found. Free report with contaminant data and filter picks.

Grand County, CO: 2 Health Violations — 63/100 (2026)

2026 report: Grand County, CO scores 63/100 (Grade C). 8 ZIP codes analyzed. 61 EPA violations found. Free report with contaminant data and filter picks.

Gunnison County, CO: 7 Health Violations — 56/100 (2026)

2026 report: Gunnison County, CO scores 56/100 (Grade C). 12 ZIP codes analyzed. 68 EPA violations found. Free report with contaminant data and filter p...

Hinsdale County, CO: 3 Violations — 82/100 (2026)

2026 report: Hinsdale County, CO scores 82/100 (Grade B). 1 ZIP code analyzed. 3 EPA violations found. Free report with contaminant data and filter picks.

Huerfano County, CO: 19 Health Violations — 43/100 (2026)

2026 report: Huerfano County, CO scores 43/100 (Grade D). 5 ZIP codes analyzed. 74 EPA violations found. Free report with contaminant data and filter pi...

Jackson County, CO: 7 Violations — 46/100 (2026)

2026 report: Jackson County, CO scores 46/100 (Grade D). 3 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter picks.

Jefferson County, CO: 29 Health Violations — 62/100 (2026)

2026 report: Jefferson County, CO scores 62/100 (Grade C). 34 ZIP codes analyzed. 187 EPA violations found. Free report with contaminant data and filter...

Kiowa County, CO: 4 Health Violations — 57/100 (2026)

2026 report: Kiowa County, CO scores 57/100 (Grade C). 4 ZIP codes analyzed. 48 EPA violations found. Free report with contaminant data and filter picks.

Kit Carson County, CO: 2 Health Violations — 54/100 (2026)

2026 report: Kit Carson County, CO scores 54/100 (Grade D). 10 ZIP codes analyzed. 35 EPA violations found. Free report with contaminant data and filter...

La Plata County, CO: 7 Health Violations — 56/100 (2026)

2026 report: La Plata County, CO scores 56/100 (Grade C). 8 ZIP codes analyzed. 53 EPA violations found. Free report with contaminant data and filter pi...

Lake County, CO: 26 Violations — 45/100 (2026)

2026 report: Lake County, CO scores 45/100 (Grade D). 3 ZIP codes analyzed. 26 EPA violations found. Free report with contaminant data and filter picks.

Larimer County, CO: 23 Health Violations — 54/100 (2026)

2026 report: Larimer County, CO scores 54/100 (Grade D). 24 ZIP codes analyzed. 258 EPA violations found. Free report with contaminant data and filter p...

Las Animas County, CO: 1 Health Violation — 55/100 (2026)

2026 report: Las Animas County, CO scores 55/100 (Grade C). 6 ZIP codes analyzed. 38 EPA violations found. Free report with contaminant data and filter ...

Lincoln County, CO: 2 Health Violations — 52/100 (2026)

2026 report: Lincoln County, CO scores 52/100 (Grade D). 9 ZIP codes analyzed. 40 EPA violations found. Free report with contaminant data and filter picks.

Logan County, CO: 7 Health Violations — 56/100 (2026)

2026 report: Logan County, CO scores 56/100 (Grade C). 9 ZIP codes analyzed. 44 EPA violations found. Free report with contaminant data and filter picks.

Mesa County, CO: 22 Violations — 59/100 (2026)

2026 report: Mesa County, CO scores 59/100 (Grade C). 19 ZIP codes analyzed. 22 EPA violations found. Free report with contaminant data and filter picks.

Mineral County, CO: 4 Violations — 81/100 (2026)

2026 report: Mineral County, CO scores 81/100 (Grade B). 1 ZIP code analyzed. 4 EPA violations found. Free report with contaminant data and filter picks.

Moffat County, CO: 2 Health Violations — 56/100 (2026)

2026 report: Moffat County, CO scores 56/100 (Grade C). 6 ZIP codes analyzed. 26 EPA violations found. Free report with contaminant data and filter picks.

Montezuma County, CO: 1 Health Violation — 49/100 (2026)

2026 report: Montezuma County, CO scores 49/100 (Grade D). 7 ZIP codes analyzed. 38 EPA violations found. Free report with contaminant data and filter p...

Montrose County, CO: 23 Health Violations — 55/100 (2026)

2026 report: Montrose County, CO scores 55/100 (Grade C). 10 ZIP codes analyzed. 104 EPA violations found. Free report with contaminant data and filter ...

Morgan County, CO: 4 Health Violations — 60/100 (2026)

2026 report: Morgan County, CO scores 60/100 (Grade C). 7 ZIP codes analyzed. 29 EPA violations found. Free report with contaminant data and filter picks.

Otero County, CO: 138 Health Violations — 46/100 (2026)

2026 report: Otero County, CO scores 46/100 (Grade D). 6 ZIP codes analyzed. 253 EPA violations found. Free report with contaminant data and filter picks.

Ouray County, CO: Lead Above EPA Limits — 55/100 (2026)

2026 report: Ouray County, CO scores 55/100 (Grade C). 2 ZIP codes analyzed. 36 EPA violations found. Lead above EPA limits. Free report with contaminan...

Park County, CO: 5 Health Violations — 53/100 (2026)

2026 report: Park County, CO scores 53/100 (Grade D). 8 ZIP codes analyzed. 57 EPA violations found. Free report with contaminant data and filter picks.

Phillips County, CO: Lead Above EPA Limits — 54/100 (2026)

2026 report: Phillips County, CO scores 54/100 (Grade D). 4 ZIP codes analyzed. 11 EPA violations found. Lead above EPA limits. Free report with contami...

Pitkin County, CO: 2 Health Violations — 63/100 (2026)

2026 report: Pitkin County, CO scores 63/100 (Grade C). 6 ZIP codes analyzed. 67 EPA violations found. Free report with contaminant data and filter picks.

Prowers County, CO: 45 Health Violations — 45/100 (2026)

2026 report: Prowers County, CO scores 45/100 (Grade D). 6 ZIP codes analyzed. 110 EPA violations found. Free report with contaminant data and filter pi...

Pueblo County, CO: 51 Health Violations — 63/100 (2026)

2026 report: Pueblo County, CO scores 63/100 (Grade C). 17 ZIP codes analyzed. 133 EPA violations found. Free report with contaminant data and filter pi...

Rio Blanco County, CO: 2 Health Violations — 68/100 (2026)

2026 report: Rio Blanco County, CO scores 68/100 (Grade C). 2 ZIP codes analyzed. 22 EPA violations found. Free report with contaminant data and filter ...

Rio Grande County, CO: 4 Health Violations — 73/100 (2026)

2026 report: Rio Grande County, CO scores 73/100 (Grade B). 5 ZIP codes analyzed. 46 EPA violations found. Free report with contaminant data and filter ...

Routt County, CO: 39 Health Violations — 66/100 (2026)

2026 report: Routt County, CO scores 66/100 (Grade C). 11 ZIP codes analyzed. 214 EPA violations found. Free report with contaminant data and filter picks.

Saguache County, CO: 2 Health Violations — 67/100 (2026)

2026 report: Saguache County, CO scores 67/100 (Grade C). 5 ZIP codes analyzed. 15 EPA violations found. Free report with contaminant data and filter pi...

San Juan County, CO: 3 Violations — 80/100 (2026)

2026 report: San Juan County, CO scores 80/100 (Grade B). 1 ZIP code analyzed. 3 EPA violations found. Free report with contaminant data and filter picks.

San Miguel County, CO: 18 Health Violations — 58/100 (2026)

2026 report: San Miguel County, CO scores 58/100 (Grade C). 4 ZIP codes analyzed. 124 EPA violations found. Free report with contaminant data and filter...

Sedgwick County, CO: 2 Health Violations — 63/100 (2026)

2026 report: Sedgwick County, CO scores 63/100 (Grade C). 3 ZIP codes analyzed. 14 EPA violations found. Free report with contaminant data and filter pi...

Summit County, CO: 3 Health Violations — 65/100 (2026)

2026 report: Summit County, CO scores 65/100 (Grade C). 5 ZIP codes analyzed. 54 EPA violations found. Free report with contaminant data and filter picks.

Teller County, CO: 27 Health Violations — 57/100 (2026)

2026 report: Teller County, CO scores 57/100 (Grade C). 7 ZIP codes analyzed. 157 EPA violations found. Free report with contaminant data and filter picks.

Washington County, CO: 2 Health Violations — 57/100 (2026)

2026 report: Washington County, CO scores 57/100 (Grade C). 3 ZIP codes analyzed. 18 EPA violations found. Free report with contaminant data and filter ...

Weld County, CO: 11 Health Violations — 61/100 (2026)

2026 report: Weld County, CO scores 61/100 (Grade C). 38 ZIP codes analyzed. 140 EPA violations found. Free report with contaminant data and filter picks.

Yuma County, CO: 1 Health Violation — 51/100 (2026)

2026 report: Yuma County, CO scores 51/100 (Grade D). 5 ZIP codes analyzed. 32 EPA violations found. Free report with contaminant data and filter picks.