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THORNTON CITY OF

Colorado — Community Water System — PWSID: CO0101150

System Information

PWSIDCO0101150
System NameTHORNTON CITY OF
System TypeCommunity Water System
Water SourceSurface Water
Activity StatusActive
Owner TypeLocal
EPA Region08
Serves SchoolNo
WholesalerNo
First ReportedMar 20, 1979
Last ReportedNov 17, 2025

Location & Contact

StateColorado
CityTHORNTON
ZIP Code80229
Address9500 CIVIC CENTER DR
OrganizationTEDESCO, PAUL
Phone303-255-7775

Population & Service

Population Served226,465
Service Connections42,530

Drinking Water Violations (35)

This water system has 35 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 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Nov 30, 2023 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Nov 1, 2023 Nov 30, 2023 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Nov 30, 2023 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Nov 1, 2023 Nov 30, 2023 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Nov 30, 2023 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Nov 1, 2023 Nov 30, 2023 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Nov 30, 2023 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Oct 1, 2023 Oct 31, 2023 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Oct 31, 2023 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Oct 1, 2023 Oct 31, 2023 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Oct 31, 2023 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Oct 1, 2023 Oct 31, 2023 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Oct 31, 2023 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Oct 1, 2023 Oct 31, 2023 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Oct 31, 2023 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Sep 1, 2023 Sep 30, 2023 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Sep 30, 2023 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Sep 1, 2023 Sep 30, 2023 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Sep 30, 2023 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Sep 1, 2023 Sep 30, 2023 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Sep 30, 2023 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Sep 1, 2023 Sep 30, 2023 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Sep 30, 2023 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jul 1, 2023 — Lead and Copper Rule MR No No — TT — Resolved Dec 29, 2023 Lead and Copper Rule
Jul 1, 2023 — Lead and Copper Rule MR No No — TT — Resolved Dec 29, 2023 Lead and Copper Rule
Jul 1, 2023 — Lead and Copper Rule MR No No — TT — Resolved Dec 29, 2023 Lead and Copper Rule
Jul 1, 2023 — Lead and Copper Rule MR No No — TT — Resolved Dec 29, 2023 Lead and Copper Rule
Apr 1, 2022 Jun 30, 2022 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Jun 30, 2022 Radionuclides and Revised Rad Rule
Apr 1, 2022 Jun 30, 2022 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Jun 30, 2022 Radionuclides and Revised Rad Rule
Apr 1, 2022 Jun 30, 2022 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Jun 30, 2022 Radionuclides and Revised Rad Rule
Apr 1, 2022 Jun 30, 2022 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Jun 30, 2022 Radionuclides and Revised Rad Rule
Apr 1, 2022 Jun 30, 2022 Combined Uranium MR No Yes — 30 ug/L — Resolved Jun 30, 2022 Radionuclides and Revised Rad Rule
Apr 1, 2022 Jun 30, 2022 Combined Uranium MR No Yes — 30 ug/L — Resolved Jun 30, 2022 Radionuclides and Revised Rad Rule
Apr 1, 2022 Jun 30, 2022 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Jun 30, 2022 Radionuclides and Revised Rad Rule
Apr 1, 2022 Jun 30, 2022 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Jun 30, 2022 Radionuclides and Revised Rad Rule
Apr 1, 2022 Jun 30, 2022 Combined Uranium MR No Yes — 30 ug/L — Resolved Jun 30, 2022 Radionuclides and Revised Rad Rule
May 1, 2021 May 31, 2021 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved May 31, 2021 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
May 1, 2021 May 31, 2021 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved May 31, 2021 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
May 1, 2021 May 31, 2021 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved May 31, 2021 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
May 1, 2021 May 31, 2021 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved May 31, 2021 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jul 1, 2010 Dec 31, 2010 Lead and Copper Rule MR No No — TT — Resolved Dec 31, 2010 Lead and Copper Rule
Jul 1, 2010 Dec 31, 2010 Lead and Copper Rule MR No No — TT — Resolved Dec 31, 2010 Lead and Copper Rule
Jul 1, 2010 Dec 31, 2010 Lead and Copper Rule MR No No — TT — Resolved Dec 31, 2010 Lead and Copper Rule
Jan 1, 2008 Dec 31, 2010 Diquat MR No No — 0.02 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Diquat MR No No — 0.02 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Diquat MR No No — 0.02 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals

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.

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