CASTLE ROCK TOWN OF
Colorado - Community Water System - PWSID: CO0118010
System Information
| PWSID | CO0118010 |
| System Name | CASTLE ROCK TOWN OF |
| System Type | Community Water System |
| Water Source | Surface Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 08 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 20, 1979 |
| Last Reported | Feb 23, 2026 |
Location & Contact
| State | Colorado |
| City | CASTLE ROCK |
| ZIP Code | 80109 |
| Address | 175 KELLOGG CT |
| Organization | BRANNING, HANNAH |
| Phone | 720-733-6041 |
Population & Service
| Population Served | 106,822 |
| Service Connections | 27,172 |
Drinking Water Violations (52)
This water system has 52 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jun 1, 2025 | Jun 30, 2025 | MR | No | Yes | - | - | - | Resolved | Jun 30, 2025 | - | |
| Jun 1, 2025 | Jun 30, 2025 | MR | No | Yes | - | - | - | Resolved | Jun 30, 2025 | - | |
| Jun 1, 2025 | Jun 30, 2025 | MR | No | Yes | - | - | - | Resolved | Jun 30, 2025 | - | |
| May 1, 2025 | May 31, 2025 | MR | No | No | - | - | - | Resolved | May 31, 2025 | - | |
| May 1, 2025 | May 31, 2025 | MR | No | No | - | - | - | Resolved | May 31, 2025 | - | |
| May 1, 2025 | May 31, 2025 | MR | No | No | - | - | - | Resolved | May 31, 2025 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 5 pCi/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 5 pCi/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 5 pCi/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 15 pCi/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 15 pCi/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 15 pCi/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 15 pCi/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 30 ug/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 5 pCi/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 30 ug/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 30 ug/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 30 ug/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 5 pCi/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 30 ug/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 30 ug/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 15 pCi/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 15 pCi/L | - | Resolved | Jun 30, 2022 | - | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | - | 5 pCi/L | - | Resolved | Jun 30, 2022 | - | |
| May 1, 2019 | May 31, 2019 | MR | No | Yes | - | - | - | Resolved | May 31, 2019 | - | |
| May 1, 2019 | May 31, 2019 | MR | No | Yes | - | - | - | Resolved | May 31, 2019 | - | |
| May 1, 2019 | May 31, 2019 | MR | No | Yes | - | - | - | Resolved | May 31, 2019 | - | |
| Oct 1, 2013 | Oct 31, 2013 | MR | No | No | - | - | - | Resolved | Oct 31, 2013 | - | |
| Oct 1, 2013 | Oct 31, 2013 | MR | No | No | - | - | - | Resolved | Oct 31, 2013 | - | |
| Oct 1, 2013 | Oct 31, 2013 | MR | No | No | - | - | - | Resolved | Oct 31, 2013 | - | |
| Sep 1, 2013 | Sep 30, 2013 | MR | No | No | - | - | - | Resolved | Sep 30, 2013 | - | |
| Sep 1, 2013 | Sep 30, 2013 | MR | No | No | - | - | - | Resolved | Sep 30, 2013 | - | |
| Sep 1, 2013 | Sep 30, 2013 | MR | No | No | - | - | - | Resolved | Sep 30, 2013 | - | |
| Apr 1, 2008 | Jun 30, 2008 | MR | No | Yes | - | 1 mg/L | - | Resolved | Jun 30, 2008 | - | |
| Apr 1, 2008 | Jun 30, 2008 | MR | No | Yes | - | 1 mg/L | - | Resolved | Jun 30, 2008 | - | |
| Apr 1, 2008 | Jun 30, 2008 | MR | No | Yes | - | 1 mg/L | - | Resolved | Jun 30, 2008 | - | |
| Jul 1, 2007 | - | Other | No | No | - | - | - | Resolved | Aug 13, 2007 | - | |
| Jul 1, 2007 | - | Other | No | No | - | - | - | Resolved | Aug 13, 2007 | - | |
| Aug 1, 2006 | Aug 31, 2006 | MR | No | No | - | 5% of samples | - | Resolved | Aug 31, 2006 | - | |
| Aug 1, 2006 | Aug 31, 2006 | MR | No | No | - | 5% of samples | - | Resolved | Aug 31, 2006 | - | |
| Aug 1, 2006 | Aug 31, 2006 | MR | No | No | - | 5% of samples | - | Resolved | Aug 31, 2006 | - | |
| Jan 1, 2006 | Dec 31, 2006 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | Dec 31, 2006 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | Dec 31, 2006 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | Dec 31, 2006 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | Dec 31, 2006 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | Dec 31, 2006 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | Dec 31, 2006 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | Dec 31, 2006 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2006 | - | |
| Jun 1, 1999 | Jun 30, 1999 | MR | No | No | - | 5% of samples | - | Resolved | Jun 30, 1999 | - |
About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.