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MCCOY LAKE

Washington — Community Water System — PWSID: 105300021

System Information

PWSID105300021
System NameMCCOY LAKE
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeNative American
EPA Region10
Serves SchoolNo
WholesalerNo
First ReportedJan 27, 1981
Last ReportedDec 30, 2025

Location & Contact

StateWashington
CityWELLPINIT
ZIP Code99040
Address6195 FORD-WELLPINIT RD
OrganizationCULLOOYAH, MARIA
Phone509-458-6529

Population & Service

Population Served325
Service Connections90

Drinking Water Violations (270)

This water system has 270 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
Apr 3, 2025 — Public Notice Other No No — — — Resolved Jul 30, 2025 Public Notice Rule and Revised PN Rule
Mar 9, 2025 — Public Notice Other No No — — — Resolved Jul 30, 2025 Public Notice Rule and Revised PN Rule
Jan 5, 2025 — Groundwater Rule TT Yes No — — — Resolved Jul 28, 2025 Ground Water Rule
Apr 1, 2023 — Revised Total Coliform Rule RPT No No — — — Resolved May 19, 2023 Revised Total Coliform Rule
May 1, 2022 — Revised Total Coliform Rule RPT No No — — — Resolved Jun 14, 2022 Revised Total Coliform Rule
Sep 1, 2020 Sep 30, 2020 Revised Total Coliform Rule MON No Yes — — — Resolved Sep 30, 2020 Revised Total Coliform Rule
Jul 1, 2019 — Consumer Confidence Rule Other No No — — — Resolved Oct 4, 2019 Consumer Confidence Rule
Jun 1, 2019 Jun 30, 2019 Revised Total Coliform Rule MON No Yes — — — Resolved Jun 30, 2019 Revised Total Coliform Rule
Oct 1, 2018 — Consumer Confidence Rule Other No No — — — Resolved Oct 4, 2019 Consumer Confidence Rule
Jul 1, 2018 — Consumer Confidence Rule Other No No — — — Resolved Nov 15, 2018 Consumer Confidence Rule
Jun 1, 2018 — Groundwater Rule TT Yes No — — — Resolved Jan 12, 2024 Ground Water Rule
Dec 13, 2016 — Revised Total Coliform Rule RPT No No — — — Resolved Dec 27, 2016 Revised Total Coliform Rule
Oct 11, 2016 — Revised Total Coliform Rule RPT No No — — — Resolved Oct 21, 2016 Revised Total Coliform Rule
Oct 1, 2016 — Consumer Confidence Rule Other No No — — — Resolved May 11, 2017 Consumer Confidence Rule
Sep 1, 2016 Sep 30, 2016 Revised Total Coliform Rule MON No Yes — — — Resolved Sep 30, 2016 Revised Total Coliform Rule
Aug 11, 2016 — Revised Total Coliform Rule RPT No No — — — Resolved Aug 16, 2016 Revised Total Coliform Rule
Jul 1, 2016 — Consumer Confidence Rule Other No No — — — Resolved May 11, 2017 Consumer Confidence Rule
Jun 1, 2016 Jun 30, 2016 Revised Total Coliform Rule MON No Yes — — — Resolved Jun 30, 2016 Revised Total Coliform Rule
Jan 1, 2016 — Lead and Copper Rule MR No No — TT — Resolved Aug 24, 2017 Lead and Copper Rule
Dec 1, 2015 Dec 31, 2015 Coliform (TCR) MR No No — 5% of samples — Resolved Dec 31, 2015 Total Coliform Rule
Oct 1, 2015 — Consumer Confidence Rule Other No No — — — Resolved Jul 11, 2016 Consumer Confidence Rule
Sep 1, 2015 Sep 30, 2015 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2015 Total Coliform Rule
Apr 1, 2014 Apr 30, 2014 Coliform (TCR) MR No No — 5% of samples — Resolved Apr 30, 2014 Total Coliform Rule
Feb 1, 2014 Feb 28, 2014 Coliform (TCR) MR No No — 5% of samples — Resolved Feb 28, 2014 Total Coliform Rule
Jan 1, 2014 Dec 31, 2016 Combined Uranium MR No Yes — 30 ug/L — Resolved Dec 31, 2016 Radionuclides and Revised Rad Rule
Jan 1, 2014 Dec 31, 2016 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Dec 31, 2016 Radionuclides and Revised Rad Rule
Jan 1, 2014 Dec 31, 2016 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Dec 31, 2016 Radionuclides and Revised Rad Rule
Sep 1, 2013 Sep 30, 2013 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2013 Total Coliform Rule
Jul 1, 2012 — Consumer Confidence Rule Other No No — — — Resolved Aug 6, 2012 Consumer Confidence Rule
Aug 1, 2011 Aug 31, 2011 Coliform (TCR) MR No No — 5% of samples — Resolved Aug 31, 2011 Total Coliform Rule
Jan 1, 2011 Dec 31, 2013 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Dec 31, 2013 Radionuclides and Revised Rad Rule
Aug 1, 2008 Aug 31, 2008 Coliform (TCR) MR No No — 5% of samples — Resolved Aug 31, 2008 Total Coliform Rule
Jan 1, 2008 Dec 31, 2010 Di(2-ethylhexyl) adipate MR No Yes — 0.4 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Chromium MR No Yes — 0.1 mg/L — Resolved Dec 31, 2010 Inorganic Chemicals
Jan 1, 2008 Dec 31, 2010 Chlordane MR No Yes — 0.002 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 HEXACHLOROBENZENE MR No Yes — 0.001 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Picloram MR No Yes — 0.5 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 OXAMYL MR No Yes — 0.2 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Simazine MR No Yes — 0.004 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Diquat MR No Yes — 0.02 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Glyphosate MR No Yes — 0.7 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Mercury MR No Yes — 0.002 mg/L — Resolved Dec 31, 2010 Inorganic Chemicals
Jan 1, 2008 Dec 31, 2010 Endothall MR No Yes — 0.1 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Benzo(a)pyrene MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 BHC-GAMMA MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Thallium, Total MR No Yes — 0.002 mg/L — Resolved Dec 31, 2010 Inorganic Chemicals
Jan 1, 2008 Dec 31, 2010 trans-1,2-Dichloroethylene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 1,2-Dichloropropane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2010 Inorganic 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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