Water Quality: Castle Rock, CO
8 water systems • 115,659 people served
Multiple Health ViolationsWater Quality Summary
Castle Rock is served by 8 public water systems with a combined service population of 115,659 people, and has 138 EPA Safe Drinking Water Act violations on record. Critically, 36 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Castle Rock's violation count is roughly in line with the national average for Colorado. Contaminants associated with violations include Chlorine, Disinfection Byproducts, Total Organic Carbon.
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)
Broad category of chemicals formed during disinfection, associated with increased cancer risk and adverse reproductive effects.
Common source: Reaction of disinfectants (chlorine, ozone, chloramines) with organic matter
Not a direct health risk but reacts with disinfectants to form carcinogenic byproducts such as trihalomethanes.
Common source: Decaying plant material, algae, soil organic matter in source water
EPA limit: Treatment technique (must reduce TOC based on source water level)
Water Systems Serving Castle Rock
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| CASTLE ROCK TOWN OF | CO0118010 | Surface Water | 106,822 | 35 |
| CASTLE PINES VILLAGE MD | CO0118005 | Groundwater | 5,656 | 0 |
| CONSOLIDATED BELL MTN RANCH MD | CO0118002 | Groundwater | 1,000 | 3 |
| ACADEMY WSD | CO0121025 | Groundwater | 750 | 15 |
| INDEPENDENCE WSD | CO0120384 | Groundwater | 567 | 0 |
| BEVERLY HILLS MUTUAL WC | CO0118001 | Groundwater | 325 | 10 |
| SILVER HEIGHTS WSD | CO0118075 | Groundwater | 301 | 4 |
| LOUVIERS WSD | CO0118035 | Groundwater | 238 | 71 |
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.