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CASTLE ROCK TOWN OF

Colorado — Community Water System — PWSID: CO0118010

System Information

PWSIDCO0118010
System NameCASTLE ROCK TOWN 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
CityCASTLE ROCK
ZIP Code80109
Address175 KELLOGG CT
OrganizationBRANNING, HANNAH
Phone720-733-6041

Population & Service

Population Served106,822
Service Connections27,172

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 Surface Water Treatment Rule MR No Yes — — — Resolved Jun 30, 2025 Surface Water Treatment Rule
Jun 1, 2025 Jun 30, 2025 Surface Water Treatment Rule MR No Yes — — — Resolved Jun 30, 2025 Surface Water Treatment Rule
Jun 1, 2025 Jun 30, 2025 Surface Water Treatment Rule MR No Yes — — — Resolved Jun 30, 2025 Surface Water Treatment Rule
May 1, 2025 May 31, 2025 Surface Water Treatment Rule MR No No — — — Resolved May 31, 2025 Surface Water Treatment Rule
May 1, 2025 May 31, 2025 Surface Water Treatment Rule MR No No — — — Resolved May 31, 2025 Surface Water Treatment Rule
May 1, 2025 May 31, 2025 Surface Water Treatment Rule MR No No — — — Resolved May 31, 2025 Surface Water Treatment 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 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 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 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
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 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 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 Uranium MR No Yes — 30 ug/L — Resolved Jun 30, 2022 Radionuclides and Revised Rad Rule
May 1, 2019 May 31, 2019 Surface Water Treatment Rule MR No Yes — — — Resolved May 31, 2019 Surface Water Treatment Rule
May 1, 2019 May 31, 2019 Surface Water Treatment Rule MR No Yes — — — Resolved May 31, 2019 Surface Water Treatment Rule
May 1, 2019 May 31, 2019 Surface Water Treatment Rule MR No Yes — — — Resolved May 31, 2019 Surface Water Treatment Rule
Oct 1, 2013 Oct 31, 2013 Surface Water Treatment Rule MR No No — — — Resolved Oct 31, 2013 Surface Water Treatment Rule
Oct 1, 2013 Oct 31, 2013 Surface Water Treatment Rule MR No No — — — Resolved Oct 31, 2013 Surface Water Treatment Rule
Oct 1, 2013 Oct 31, 2013 Surface Water Treatment Rule MR No No — — — Resolved Oct 31, 2013 Surface Water Treatment Rule
Sep 1, 2013 Sep 30, 2013 Surface Water Treatment Rule MR No No — — — Resolved Sep 30, 2013 Surface Water Treatment Rule
Sep 1, 2013 Sep 30, 2013 Surface Water Treatment Rule MR No No — — — Resolved Sep 30, 2013 Surface Water Treatment Rule
Sep 1, 2013 Sep 30, 2013 Surface Water Treatment Rule MR No No — — — Resolved Sep 30, 2013 Surface Water Treatment Rule
Apr 1, 2008 Jun 30, 2008 Nitrite MR No Yes — 1 mg/L — Resolved Jun 30, 2008 Nitrate Rule
Apr 1, 2008 Jun 30, 2008 Nitrite MR No Yes — 1 mg/L — Resolved Jun 30, 2008 Nitrate Rule
Apr 1, 2008 Jun 30, 2008 Nitrite MR No Yes — 1 mg/L — Resolved Jun 30, 2008 Nitrate Rule
Jul 1, 2007 — Consumer Confidence Rule Other No No — — — Resolved Aug 13, 2007 Consumer Confidence Rule
Jul 1, 2007 — Consumer Confidence Rule Other No No — — — Resolved Aug 13, 2007 Consumer Confidence Rule
Aug 1, 2006 Aug 31, 2006 Coliform (TCR) MR No No — 5% of samples — Resolved Aug 31, 2006 Total Coliform Rule
Aug 1, 2006 Aug 31, 2006 Coliform (TCR) MR No No — 5% of samples — Resolved Aug 31, 2006 Total Coliform Rule
Aug 1, 2006 Aug 31, 2006 Coliform (TCR) MR No No — 5% of samples — Resolved Aug 31, 2006 Total Coliform Rule
Jan 1, 2006 Dec 31, 2006 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2006 Nitrate Rule
Jan 1, 2006 Dec 31, 2006 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2006 Nitrate Rule
Jan 1, 2006 Dec 31, 2006 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2006 Nitrate Rule
Jan 1, 2006 Dec 31, 2006 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2006 Nitrate Rule
Jan 1, 2006 Dec 31, 2006 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2006 Nitrate Rule
Jan 1, 2006 Dec 31, 2006 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2006 Nitrate Rule
Jan 1, 2006 Dec 31, 2006 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2006 Nitrate Rule
Jan 1, 2006 Dec 31, 2006 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2006 Nitrate Rule
Jun 1, 1999 Jun 30, 1999 Coliform (TCR) MR No No — 5% of samples — Resolved Jun 30, 1999 Total Coliform Rule

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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