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ONTARIO, CITY OF

Oregon — Community Water System — PWSID: OR4100587

System Information

PWSIDOR4100587
System NameONTARIO, 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
CityONTARIO
ZIP Code97914
Address1900 SE 5TH AVE
OrganizationONTARIO, CITY OF
Phone541-889-8011

Population & Service

Population Served14,465
Service Connections4,082

Drinking Water Violations (144)

This water system has 144 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
Mar 1, 2023 Mar 31, 2023 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Mar 31, 2023 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Mar 1, 2023 Mar 31, 2023 Surface Water Treatment Rule MR No Yes — — — Resolved Mar 31, 2023 Surface Water Treatment Rule
Mar 1, 2023 Mar 31, 2023 Surface Water Treatment Rule MR No Yes — — — Resolved Mar 31, 2023 Surface Water Treatment Rule
Mar 1, 2023 Mar 31, 2023 Surface Water Treatment Rule MR No Yes — — — Resolved Mar 31, 2023 Surface Water Treatment Rule
Mar 1, 2023 Mar 31, 2023 Surface Water Treatment Rule MR No Yes — — — Resolved Mar 31, 2023 Surface Water Treatment Rule
Mar 1, 2023 Mar 31, 2023 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Mar 31, 2023 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jan 1, 2023 Jan 31, 2023 Revised Total Coliform Rule MON No No — — — Resolved Jan 31, 2023 Revised Total Coliform Rule
Jul 1, 2015 Sep 30, 2015 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2015 Sep 30, 2015 TTHM MR No Yes — 0.080 mg/L — Resolved Sep 30, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Aug 1, 2014 Aug 31, 2014 Surface Water Treatment Rule MR No Yes — — — Resolved Aug 31, 2014 Surface Water Treatment Rule
Aug 1, 2014 Aug 31, 2014 Surface Water Treatment Rule MR No Yes — — — Resolved Aug 31, 2014 Surface Water Treatment Rule
Aug 1, 2014 Aug 31, 2014 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Aug 31, 2014 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jul 1, 2013 Jul 31, 2013 Coliform (TCR) MR No No — 5% of samples — Resolved Jul 31, 2013 Total Coliform Rule
Jan 1, 2012 Jan 31, 2012 Surface Water Treatment Rule MR No Yes — — — Resolved Jan 31, 2012 Surface Water Treatment Rule
Jan 1, 2012 Jan 31, 2012 Surface Water Treatment Rule MR No Yes — — — Resolved Jan 31, 2012 Surface Water Treatment Rule
Jan 1, 2012 Jan 31, 2012 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Jan 31, 2012 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jan 1, 2012 Jan 31, 2012 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Jan 31, 2012 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jan 1, 2012 Jan 31, 2012 Surface Water Treatment Rule MR No Yes — — — Resolved Jan 31, 2012 Surface Water Treatment Rule
Jan 1, 2012 Jan 31, 2012 Surface Water Treatment Rule MR No Yes — — — Resolved Jan 31, 2012 Surface Water Treatment Rule
Nov 1, 2011 Nov 30, 2011 Surface Water Treatment Rule MR No Yes — — — Resolved Nov 30, 2011 Surface Water Treatment Rule
Nov 1, 2011 Nov 30, 2011 Surface Water Treatment Rule MR No Yes — — — Resolved Nov 30, 2011 Surface Water Treatment Rule
Nov 1, 2011 Nov 30, 2011 Surface Water Treatment Rule MR No Yes — — — Resolved Nov 30, 2011 Surface Water Treatment Rule
Nov 1, 2011 Nov 30, 2011 Surface Water Treatment Rule MR No Yes — — — Resolved Nov 30, 2011 Surface Water Treatment Rule
Nov 1, 2011 Nov 30, 2011 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Nov 30, 2011 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Nov 1, 2011 Nov 30, 2011 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Nov 30, 2011 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jan 1, 2011 Mar 31, 2011 TTHM MR No Yes — 0.080 mg/L — Resolved Mar 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2011 Mar 31, 2011 TTHM MR No Yes — 0.080 mg/L — Resolved Mar 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2011 Mar 31, 2011 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Mar 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2011 Mar 31, 2011 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Mar 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Mar 1, 2010 Mar 31, 2010 Coliform (TCR) MR No No — 5% of samples — Resolved Mar 31, 2010 Total Coliform Rule
Mar 1, 2010 Mar 31, 2010 Coliform (TCR) MR No No — 5% of samples — Resolved Mar 31, 2010 Total Coliform Rule
Mar 1, 2010 Mar 31, 2010 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Mar 31, 2010 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Mar 1, 2010 Mar 31, 2010 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Mar 31, 2010 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Mar 1, 2010 Mar 31, 2010 Surface Water Treatment Rule MR No Yes — — — Resolved Mar 31, 2010 Surface Water Treatment Rule
Mar 1, 2010 Mar 31, 2010 Surface Water Treatment Rule MR No Yes — — — Resolved Mar 31, 2010 Surface Water Treatment Rule
Jan 1, 2010 Mar 31, 2010 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Mar 31, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2010 Mar 31, 2010 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Mar 31, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2010 Mar 31, 2010 TTHM MR No Yes — 0.080 mg/L — Resolved Mar 31, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2010 Mar 31, 2010 TTHM MR No Yes — 0.080 mg/L — Resolved Mar 31, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2009 Dec 31, 2009 Arsenic MR No Yes — 0.010 mg/L — Resolved Dec 31, 2009 Arsenic Rule
Jan 1, 2009 Dec 31, 2009 Arsenic MR No Yes — 0.010 mg/L — Resolved Dec 31, 2009 Arsenic Rule
Jan 1, 2009 Dec 31, 2009 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2009 Nitrate Rule
Jan 1, 2009 Dec 31, 2009 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2009 Nitrate Rule
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 Methoxychlor MR No Yes — 0.04 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 Benzo(a)pyrene MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2010 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2008 Tetrachloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2008 Volatile 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 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2010 Synthetic 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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