THORNTON CITY OF
Colorado — Community Water System — PWSID: CO0101150
System Information
| PWSID | CO0101150 |
| System Name | THORNTON CITY 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 | THORNTON |
| ZIP Code | 80229 |
| Address | 9500 CIVIC CENTER DR |
| Organization | TEDESCO, PAUL |
| Phone | 303-255-7775 |
Population & Service
| Population Served | 226,465 |
| Service Connections | 42,530 |
Drinking Water Violations (36)
This water system has 36 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Nov 1, 2023 | Nov 30, 2023 | MR | No | Yes | — | — | — | Resolved | Nov 30, 2023 | — | |
| Nov 1, 2023 | Nov 30, 2023 | MR | No | Yes | — | — | — | Resolved | Nov 30, 2023 | — | |
| Nov 1, 2023 | Nov 30, 2023 | MR | No | Yes | — | — | — | Resolved | Nov 30, 2023 | — | |
| Nov 1, 2023 | Nov 30, 2023 | MR | No | Yes | — | — | — | Resolved | Nov 30, 2023 | — | |
| Oct 1, 2023 | Oct 31, 2023 | MR | No | Yes | — | — | — | Resolved | Oct 31, 2023 | — | |
| Oct 1, 2023 | Oct 31, 2023 | MR | No | Yes | — | — | — | Resolved | Oct 31, 2023 | — | |
| Oct 1, 2023 | Oct 31, 2023 | MR | No | Yes | — | — | — | Resolved | Oct 31, 2023 | — | |
| Oct 1, 2023 | Oct 31, 2023 | MR | No | Yes | — | — | — | Resolved | Oct 31, 2023 | — | |
| Sep 1, 2023 | Sep 30, 2023 | MR | No | Yes | — | — | — | Resolved | Sep 30, 2023 | — | |
| Sep 1, 2023 | Sep 30, 2023 | MR | No | Yes | — | — | — | Resolved | Sep 30, 2023 | — | |
| Sep 1, 2023 | Sep 30, 2023 | MR | No | Yes | — | — | — | Resolved | Sep 30, 2023 | — | |
| Sep 1, 2023 | Sep 30, 2023 | MR | No | Yes | — | — | — | Resolved | Sep 30, 2023 | — | |
| Jul 1, 2023 | — | MR | No | No | — | TT | — | Resolved | Dec 29, 2023 | — | |
| Jul 1, 2023 | — | MR | No | No | — | TT | — | Resolved | Dec 29, 2023 | — | |
| Jul 1, 2023 | — | MR | No | No | — | TT | — | Resolved | Dec 29, 2023 | — | |
| Jul 1, 2023 | — | MR | No | No | — | TT | — | Resolved | Dec 29, 2023 | — | |
| 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 | — | 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 | — | 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 | — | 30 ug/L | — | Resolved | Jun 30, 2022 | — | |
| Apr 1, 2022 | Jun 30, 2022 | MR | No | Yes | — | 5 pCi/L | — | Resolved | Jun 30, 2022 | — | |
| May 1, 2021 | May 31, 2021 | MR | No | Yes | — | — | — | Resolved | May 31, 2021 | — | |
| May 1, 2021 | May 31, 2021 | MR | No | Yes | — | — | — | Resolved | May 31, 2021 | — | |
| May 1, 2021 | May 31, 2021 | MR | No | Yes | — | — | — | Resolved | May 31, 2021 | — | |
| May 1, 2021 | May 31, 2021 | MR | No | Yes | — | — | — | Resolved | May 31, 2021 | — | |
| Jul 1, 2010 | Dec 31, 2010 | MR | No | No | — | TT | — | Resolved | Dec 31, 2010 | — | |
| Jul 1, 2010 | Dec 31, 2010 | MR | No | No | — | TT | — | Resolved | Dec 31, 2010 | — | |
| Jul 1, 2010 | Dec 31, 2010 | MR | No | No | — | TT | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | No | — | 0.02 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | No | — | 0.02 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | No | — | 0.02 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Sep 1, 2003 | Sep 30, 2003 | MR | No | No | — | — | — | Resolved | Sep 30, 2003 | — |
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.