Colorado tap water by county
Hardness, PFAS sampling, lead and violations for the largest water systems in 8 Colorado counties. In 6 of them, at least one large system detected PFAS in EPA testing (a detection isn't a violation).
| County | Largest system | Hardness | PFAS detected |
|---|---|---|---|
| El Paso County | Colorado Springs Utilities | 9.1 gpg (low) | 4 of 6 systems |
| Denver County | Denver Water Board | 6.1 gpg (high) | 0 of 2 systems |
| Arapahoe County | Aurora City of | 6.6 gpg (high) | 4 of 4 systems |
| Jefferson County | Arvada City of | 6.4 gpg (low) | 1 of 3 systems |
| Adams County | Thornton City of | 13.3 gpg (low) | 3 of 5 systems |
| Douglas County | Castle Rock Town of | 7.0 gpg (low) | 4 of 6 systems |
| Larimer County | Ft Collins City of | 1.1 gpg (low) | 1 of 6 systems |
| Weld County | Greeley City of | 32.1 gpg (low) | 0 of 6 systems |
Public-record figures, not a test of your tap. Not 100% accurate or guaranteed. Confirm with a water test, your utility or a qualified pro before you buy or act.
Hardness confidence: high = utility report; low = county estimate of untreated local water. Don't see your county? Use the water quality lookup.