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TWANOH STATE PARK

Washington — Transient Non-Community — PWSID: WA53SP940

System Information

PWSIDWA53SP940
System NameTWANOH STATE PARK
System TypeTransient Non-Community
Water SourceGround Water
Activity StatusActive
Owner TypeState
EPA Region10
Serves SchoolNo
WholesalerNo
First ReportedFeb 7, 1981
Last ReportedDec 11, 2025

Location & Contact

StateWashington
CityBelfair
ZIP Code98528
AddressPO Box 2787
OrganizationTWANOH STATE PARK
Phone—

Population & Service

Population Served3,173
Service Connections49

Drinking Water Violations (29)

This water system has 29 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
Aug 1, 2019 Aug 31, 2019 Revised Total Coliform Rule MON No No — — — Resolved Aug 31, 2019 Revised Total Coliform Rule
Dec 1, 2013 Dec 31, 2013 Coliform (TCR) MR No No — 5% of samples — Resolved Dec 31, 2013 Total Coliform Rule
Mar 1, 2011 Mar 31, 2011 Coliform (TCR) MR No No — 5% of samples — Resolved Mar 31, 2011 Total Coliform Rule
Jan 1, 2007 Dec 31, 2007 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2007 Nitrate Rule
Jan 1, 2007 Dec 31, 2007 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2007 Nitrate Rule
Jan 1, 2007 Dec 31, 2007 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2007 Nitrate Rule
Jan 1, 2007 Dec 31, 2007 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2007 Nitrate Rule
Jan 1, 2007 Dec 31, 2007 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2007 Nitrate Rule
Jan 1, 2007 Dec 31, 2007 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2007 Nitrate Rule
Dec 1, 2006 Dec 31, 2006 Coliform (TCR) MR No No — 5% of samples — Archived Dec 31, 2006 Total Coliform Rule
Jul 1, 2006 Jul 31, 2006 Coliform (TCR) MCL Yes No — 5% of samples — Archived Jul 31, 2006 Total Coliform Rule
Nov 1, 2005 Nov 30, 2005 Coliform (TCR) MR No No — 5% of samples — Archived Nov 30, 2005 Total Coliform Rule
Oct 1, 2005 Oct 31, 2005 Coliform (TCR) MCL Yes No — 5% of samples — Archived Oct 31, 2005 Total Coliform Rule
Jan 1, 2004 Dec 31, 2004 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2004 Nitrate Rule
Oct 1, 2003 Oct 31, 2003 Coliform (TCR) MCL Yes No — 5% of samples — Archived Oct 31, 2003 Total Coliform Rule
Sep 1, 2003 Sep 30, 2003 Coliform (TCR) MR No No — 5% of samples — Archived Sep 30, 2003 Total Coliform Rule
Aug 1, 2003 Aug 31, 2003 Coliform (TCR) MCL Yes No — 5% of samples — Archived Aug 31, 2003 Total Coliform Rule
Apr 1, 1999 Apr 30, 1999 Coliform (TCR) MCL Yes No — 5% of samples — Archived Apr 30, 1999 Total Coliform Rule
Apr 1, 1999 Apr 30, 1999 Coliform (TCR) MCL Yes No — 5% of samples — Archived Apr 30, 1999 Total Coliform Rule
Apr 1, 1999 Apr 30, 1999 Coliform (TCR) MCL Yes No — 5% of samples — Archived Apr 30, 1999 Total Coliform Rule
Sep 1, 1997 Sep 30, 1997 Coliform (TCR) MCL Yes No — 5% of samples — Archived Sep 30, 1997 Total Coliform Rule
Sep 1, 1997 Sep 30, 1997 Coliform (TCR) MCL Yes No — 5% of samples — Archived Sep 30, 1997 Total Coliform Rule
Sep 1, 1997 Sep 30, 1997 Coliform (TCR) MCL Yes No — 5% of samples — Archived Sep 30, 1997 Total Coliform Rule
May 1, 1996 May 31, 1996 Coliform (TCR) MR No Yes — 5% of samples — Archived May 31, 1996 Total Coliform Rule
Jun 1, 1995 Jun 30, 1995 Coliform (TCR) MCL Yes No — 5% of samples — Archived Jun 30, 1995 Total Coliform Rule
Apr 1, 1993 Apr 30, 1993 Coliform (TCR) MR No Yes — 5% of samples — Archived Apr 30, 1993 Total Coliform Rule
Aug 1, 1992 Aug 31, 1992 Coliform (TCR) MCL Yes No — 5% of samples — Archived Aug 31, 1992 Total Coliform Rule
Aug 1, 1992 Aug 31, 1992 Coliform (TCR) MCL Yes No — 5% of samples — Archived Aug 31, 1992 Total Coliform Rule
Aug 1, 1992 Aug 31, 1992 Coliform (TCR) MCL Yes No — 5% of samples — Archived Aug 31, 1992 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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