Water Quality: Thornton, CO
5 water systems • 230,581 people served
Multiple Health ViolationsWater Quality Summary
Thornton is served by 5 public water systems with a combined service population of 230,581 people, and has 295 EPA Safe Drinking Water Act violations on record. Critically, 4 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Thornton's violation count is 117% above the national average for Colorado. Contaminants associated with violations include Chlorine.
Contaminants Found
Eye and nose irritation at high levels; long-term exposure above the MCL may cause liver and kidney damage.
Common source: Water treatment disinfectant added to kill harmful microorganisms
EPA limit: 4.0 mg/L (MRDL — Maximum Residual Disinfectant Level)
Water Systems Serving Thornton
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| THORNTON CITY OF | CO0101150 | Surface Water | 226,465 | 26 |
| WOODLAND HILLS MHC | CO0101833 | Surface Water | 1,740 | 7 |
| THE GROVE AT ALTA RIDGE | CO0101320 | Surface Water | 1,300 | 42 |
| FRIENDLY VILLAGE OF THE ROCKIES | CO0101283 | Surface Water | 1,046 | 5 |
| G AND M MOBILE HOME PARK | CO0153300 | Groundwater | 30 | 215 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in Colorado
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.