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WILSONVILLE, CITY OF

Oregon — Community Water System — PWSID: OR4100954

System Information

PWSIDOR4100954
System NameWILSONVILLE, CITY OF
System TypeCommunity Water System
Water SourceSurface Water
Activity StatusActive
Owner TypeLocal
EPA Region10
Serves SchoolNo
WholesalerNo
First ReportedMar 12, 1979
Last ReportedDec 23, 2025

Location & Contact

StateOregon
CityWILSONVILLE
ZIP Code97070
Address29799 SW TOWN CENTER LOOP E
OrganizationWILSONVILLE, CITY OF
Phone503-570-1542

Population & Service

Population Served25,915
Service Connections7,187

Drinking Water Violations (43)

This water system has 43 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
Jul 1, 2025 — Consumer Confidence Rule Other No No — — — Resolved Sep 23, 2025 Consumer Confidence Rule
May 1, 2018 May 31, 2018 Revised Total Coliform Rule MON No Yes — — — Resolved May 31, 2018 Revised Total Coliform Rule
May 1, 2018 May 31, 2018 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved May 31, 2018 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
May 1, 2018 May 31, 2018 Surface Water Treatment Rule MR No Yes — — — Resolved May 31, 2018 Surface Water Treatment Rule
May 1, 2018 May 31, 2018 Surface Water Treatment Rule MR No Yes — — — Resolved May 31, 2018 Surface Water Treatment Rule
Mar 1, 2017 Mar 31, 2017 Revised Total Coliform Rule MON No No — — — Resolved Mar 31, 2017 Revised Total Coliform Rule
Apr 1, 2016 Jun 30, 2016 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Jun 30, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2016 Jun 30, 2016 TTHM MR No Yes — 0.080 mg/L — Resolved Jun 30, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Dec 23, 2013 — Public Notice Other No No — — — Resolved Jan 8, 2014 Public Notice Rule and Revised PN Rule
Oct 1, 2013 Oct 31, 2013 Coliform (TCR) MR No No — 5% of samples — Resolved Oct 31, 2013 Total Coliform Rule
Oct 1, 2013 Oct 31, 2013 Coliform (TCR) MR No No — 5% of samples — Resolved Oct 31, 2013 Total Coliform Rule
Sep 1, 2013 Sep 30, 2013 Surface Water Treatment Rule MR No Yes — — — Resolved Sep 30, 2013 Surface Water Treatment Rule
Sep 1, 2013 Sep 30, 2013 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Sep 30, 2013 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Sep 1, 2013 Sep 30, 2013 Surface Water Treatment Rule MR No Yes — — — Resolved Sep 30, 2013 Surface Water Treatment Rule
Sep 1, 2013 Sep 30, 2013 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2013 Total Coliform Rule
Nov 1, 2008 Nov 30, 2008 Coliform (TCR) MR No No — 5% of samples — Resolved Nov 30, 2008 Total Coliform Rule
May 1, 2007 Jun 30, 2007 Coliform (TCR) MR No No — 5% of samples — Resolved Jun 30, 2007 Total Coliform Rule
May 1, 2007 Jun 30, 2007 Coliform (TCR) MR No No — 5% of samples — Resolved Jun 30, 2007 Total Coliform Rule
Sep 1, 2006 Sep 30, 2006 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2006 Total Coliform Rule
Sep 1, 2006 Sep 30, 2006 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 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
Aug 1, 2006 Aug 31, 2006 Coliform (TCR) MR No No — 5% of samples — Resolved Aug 31, 2006 Total Coliform Rule
Jan 1, 2000 Dec 31, 2000 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2000 Nitrate Rule
Jan 1, 2000 Dec 31, 2000 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2000 Nitrate Rule
Oct 1, 1995 Oct 31, 1995 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 1995 Total Coliform Rule
Oct 1, 1995 Oct 31, 1995 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 1995 Total Coliform Rule
Feb 1, 1995 Feb 28, 1995 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Feb 28, 1995 Total Coliform Rule
Feb 1, 1995 Feb 28, 1995 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Feb 28, 1995 Total Coliform Rule
Feb 1, 1995 Feb 28, 1995 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Feb 28, 1995 Total Coliform Rule
Feb 1, 1995 Feb 28, 1995 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Feb 28, 1995 Total Coliform Rule
Feb 1, 1995 Feb 28, 1995 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Feb 28, 1995 Total Coliform Rule
Feb 1, 1995 Feb 28, 1995 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Feb 28, 1995 Total Coliform Rule
Jun 1, 1994 Jun 30, 1994 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jun 30, 1994 Total Coliform Rule
Jun 1, 1994 Jun 30, 1994 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jun 30, 1994 Total Coliform Rule
May 1, 1994 May 31, 1994 Coliform (TCR) MCL Yes No — 5% of samples — Resolved May 31, 1994 Total Coliform Rule
May 1, 1994 May 31, 1994 Coliform (TCR) MCL Yes No — 5% of samples — Resolved May 31, 1994 Total Coliform Rule
May 1, 1994 May 31, 1994 Coliform (TCR) MCL Yes No — 5% of samples — Resolved May 31, 1994 Total Coliform Rule
May 1, 1994 May 31, 1994 Coliform (TCR) MCL Yes No — 5% of samples — Resolved May 31, 1994 Total Coliform Rule
Mar 1, 1994 Mar 31, 1994 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Mar 31, 1994 Total Coliform Rule
Mar 1, 1994 Mar 31, 1994 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Mar 31, 1994 Total Coliform Rule
May 1, 1993 May 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved May 31, 1993 Total Coliform Rule
Jun 1, 1976 May 31, 1980 Combined Radium (-226 and -228) MR No No — 5 pCi/L — Archived May 31, 1980 Radionuclides and Revised Rad Rule
Jun 1, 1976 May 31, 1980 Gross Alpha, Excl. Radon and U MR No No — 15 pCi/L — Archived May 31, 1980 Radionuclides and Revised Rad 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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