CASTLE ROCK TOWN OF Water Quality Report
Population
106,822
people served
Water Source
🌊 Surface
rivers, lakes, reservoirs
National Rank
Top 90%
of 49,184 US systems
5-Year Record
⚠️ 28
violations recorded
C
Fair
Safety Grade
28 violations in the past 5 years
System Details
- PWSID
- CO0118010
- Population Served
- 106,822
- Water Source
- Surface Water
- Owner
- Local Government
- State
- Colorado
- EPA Region
- 8
Contaminants of Concern
| Contaminant | Status | Violations |
|---|---|---|
| Contaminant 7000 | ⚠ Monitoring/Reporting | 1 |
| Contaminant 0200 | ⚠ Monitoring/Reporting | 10 |
| Gross Alpha | ⚠ Monitoring/Reporting | 8 |
| Uranium | ⚠ Monitoring/Reporting | 8 |
| Radium-226 | ⚠ Monitoring/Reporting | 8 |
Violation History
2025
4
2022
24
2019
2
2013
4
2007
1
Total violations on record: 35
Service Area
Cities Served
ZIP Codes Served
Recommended Water Filters
Based on contaminants detected in this water system:
Reverse Osmosis System
Removes up to 99% of contaminants including PFAS, lead, arsenic, and nitrates
Removes: Uranium, Radium-226
How does this compare?
This systemNational average
Grade C
Avg: B-C
35violations total
125% of national average
National avg: ~28 per system
🏙️ This is a large system — serving 16× more people than the national average.