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WALLOWA LAKE CO SERVICE DIST

Oregon — Community Water System — PWSID: OR4101420

System Information

PWSIDOR4101420
System NameWALLOWA LAKE CO SERVICE DIST
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region10
Serves SchoolNo
WholesalerNo
First ReportedAug 29, 1989
Last ReportedDec 23, 2025

Location & Contact

StateOregon
CityENTERPRISE
ZIP Code97828
Address101 S RIVER ST RM 202
OrganizationWALLOWA LAKE CO SERVICE DIST
Phone541-263-1533

Population & Service

Population Served350
Service Connections288

Drinking Water Violations (122)

This water system has 122 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
Sep 1, 2025 Sep 30, 2025 Revised Total Coliform Rule MON No Yes — — — Archived Sep 30, 2025 Revised Total Coliform Rule
Dec 1, 2024 Dec 31, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2024 Revised Total Coliform Rule
Jul 1, 2024 Jul 31, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Jul 31, 2024 Revised Total Coliform Rule
Apr 1, 2024 Apr 30, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Apr 30, 2024 Revised Total Coliform Rule
Dec 1, 2023 Dec 31, 2023 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2023 Revised Total Coliform Rule
Oct 1, 2023 — Lead and Copper Rule MR No No — TT — Resolved Sep 11, 2024 Lead and Copper Rule
Aug 1, 2023 Aug 31, 2023 Revised Total Coliform Rule MON No Yes — — — Resolved Aug 31, 2023 Revised Total Coliform Rule
Jan 1, 2023 Dec 31, 2023 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2023 Nitrate Rule
Jan 1, 2023 Dec 31, 2023 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2023 Nitrate Rule
Oct 1, 2019 — Lead and Copper Rule MR No No — TT — Resolved Aug 7, 2020 Lead and Copper Rule
Jan 1, 2018 Mar 31, 2018 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Mar 31, 2018 Radionuclides and Revised Rad Rule
Oct 1, 2017 Dec 31, 2017 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Dec 31, 2017 Radionuclides and Revised Rad Rule
Apr 1, 2017 Jun 30, 2017 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Jun 30, 2017 Radionuclides and Revised Rad Rule
Feb 4, 2017 — E. COLI MR No Yes — — — Resolved Feb 6, 2017 Ground Water Rule
Jan 1, 2017 — Lead and Copper Rule MR No No — TT — Resolved Oct 27, 2016 Lead and Copper Rule
Jan 1, 2017 Mar 31, 2017 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Mar 31, 2017 Radionuclides and Revised Rad Rule
Jul 1, 2016 Sep 30, 2016 Combined Uranium MR No Yes — 30 ug/L — Resolved Sep 30, 2016 Radionuclides and Revised Rad Rule
Jul 1, 2016 Sep 30, 2016 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Sep 30, 2016 Radionuclides and Revised Rad Rule
Jul 1, 2016 Sep 30, 2016 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Sep 30, 2016 Radionuclides and Revised Rad Rule
Jan 1, 2016 Mar 31, 2016 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Mar 31, 2016 Radionuclides and Revised Rad Rule
Jan 1, 2016 Mar 31, 2016 Combined Uranium MR No Yes — 30 ug/L — Resolved Mar 31, 2016 Radionuclides and Revised Rad Rule
Jan 1, 2016 Mar 31, 2016 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Mar 31, 2016 Radionuclides and Revised Rad Rule
Jan 1, 2014 Dec 31, 2019 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Dec 31, 2019 Radionuclides and Revised Rad Rule
Oct 17, 2013 — E. COLI MR No Yes — — — Resolved Dec 9, 2013 Ground Water Rule
Sep 1, 2011 Sep 30, 2011 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2011 Total Coliform Rule
Sep 1, 2011 Sep 30, 2011 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2011 Total Coliform Rule
Mar 1, 2009 Mar 31, 2009 Coliform (TCR) MR No No — 5% of samples — Resolved Mar 31, 2009 Total Coliform Rule
Jan 1, 2008 Dec 31, 2016 Combined Uranium MR No Yes — 30 ug/L — Resolved Dec 31, 2016 Radionuclides and Revised Rad Rule
Jan 1, 2008 Dec 31, 2016 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Archived Dec 31, 2016 Radionuclides and Revised Rad Rule
Jul 1, 2007 Jul 31, 2007 Coliform (TCR) MR No No — 5% of samples — Resolved Jul 31, 2007 Total Coliform Rule
Nov 1, 2006 Nov 30, 2006 Coliform (TCR) MR No No — 5% of samples — Resolved Nov 30, 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, 2004 — Lead and Copper Rule MR No No — TT — Resolved Apr 20, 2005 Lead and Copper Rule
Jan 1, 2003 Dec 31, 2003 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2003 Nitrate Rule
Jan 1, 2003 Dec 31, 2003 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2003 Nitrate Rule
Oct 1, 2002 Oct 31, 2002 Coliform (TCR) MR No No — 5% of samples — Resolved Oct 31, 2002 Total Coliform Rule
Sep 1, 2002 Sep 30, 2002 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2002 Total Coliform Rule
Jul 1, 2002 Jul 31, 2002 Coliform (TCR) MR No No — 5% of samples — Resolved Jul 31, 2002 Total Coliform Rule
Jan 1, 2002 Dec 31, 2004 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Mercury MR No Yes — 0.002 mg/L — Resolved Jun 4, 2004 Inorganic Chemicals
Jan 1, 2002 Dec 31, 2004 o-Dichlorobenzene MR No Yes — 0.6 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Trichloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Trichloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Xylenes, Total MR No Yes — 10 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Xylenes, Total MR No Yes — 10 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Toluene MR No Yes — 1 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2002 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2002 Nitrate Rule
Jan 1, 2002 Dec 31, 2004 Toluene MR No Yes — 1 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 o-Dichlorobenzene MR No Yes — 0.6 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Styrene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2004 Volatile 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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