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HERMISTON, CITY OF

Oregon — Community Water System — PWSID: OR4100372

System Information

PWSIDOR4100372
System NameHERMISTON, 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
CityHERMISTON
ZIP Code97838
Address180 NE 2ND ST
OrganizationHERMISTON, CITY OF
Phone541-567-5521

Population & Service

Population Served20,000
Service Connections5,979

Drinking Water Violations (166)

This water system has 166 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
Feb 1, 2025 Feb 28, 2025 Revised Total Coliform Rule MON No No — — — Resolved Feb 28, 2025 Revised Total Coliform Rule
Jul 1, 2023 Sep 30, 2023 Nitrate MR No Yes — 10 mg/L — Resolved Sep 30, 2023 Nitrate Rule
Sep 1, 2022 Sep 30, 2022 COLIPHAGE MR No Yes — — — Resolved Sep 30, 2022 Ground Water Rule
Sep 1, 2022 Sep 30, 2022 COLIPHAGE MR No Yes — — — Resolved Sep 30, 2022 Ground Water Rule
Jul 1, 2022 Jul 31, 2022 COLIPHAGE MR No Yes — — — Resolved Jul 31, 2022 Ground Water Rule
Jul 1, 2022 Jul 31, 2022 COLIPHAGE MR No Yes — — — Resolved Jul 31, 2022 Ground Water Rule
Jul 1, 2016 Sep 30, 2016 TTHM MR No Yes — 0.080 mg/L — Resolved Sep 30, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2016 Sep 30, 2016 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2015 Jun 30, 2015 TTHM MR No Yes — 0.080 mg/L — Resolved Jun 30, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2015 Jun 30, 2015 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Jun 30, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2014 Jun 30, 2014 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Jun 30, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2014 Jun 30, 2014 TTHM MR No Yes — 0.080 mg/L — Resolved Jun 30, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2014 Mar 31, 2014 TTHM MR No Yes — 0.080 mg/L — Resolved Mar 31, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2014 Mar 31, 2014 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Mar 31, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Aug 1, 2013 Aug 31, 2013 Surface Water Treatment Rule MR No Yes — — — Resolved Aug 31, 2013 Surface Water Treatment Rule
Aug 1, 2013 Aug 31, 2013 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Aug 31, 2013 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Aug 1, 2013 Aug 31, 2013 Surface Water Treatment Rule MR No Yes — — — Resolved Aug 31, 2013 Surface Water Treatment Rule
Jan 1, 2012 Dec 31, 2012 COLIPHAGE MR No Yes — — — Resolved Dec 31, 2012 Ground Water Rule
Jan 1, 2012 Dec 31, 2012 COLIPHAGE MR No Yes — — — Resolved Dec 31, 2012 Ground Water Rule
Jul 1, 2011 Sep 30, 2011 TTHM MR No Yes — 0.080 mg/L — Resolved Sep 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2011 Sep 30, 2011 TTHM MR No Yes — 0.080 mg/L — Resolved Sep 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2011 Sep 30, 2011 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2011 Sep 30, 2011 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2010 Dec 31, 2010 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2010 Dec 31, 2010 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2010 Dec 31, 2010 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2010 Dec 31, 2010 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Sep 1, 2010 Sep 30, 2010 Surface Water Treatment Rule MR No Yes — — — Resolved Sep 30, 2010 Surface Water Treatment Rule
Sep 1, 2010 Sep 30, 2010 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Sep 30, 2010 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Sep 1, 2010 Sep 30, 2010 Surface Water Treatment Rule MR No Yes — — — Resolved Sep 30, 2010 Surface Water Treatment Rule
Sep 1, 2010 Sep 30, 2010 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Sep 30, 2010 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jul 1, 2010 Jul 31, 2010 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Jul 31, 2010 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jul 1, 2010 Jul 31, 2010 Surface Water Treatment Rule MR No Yes — — — Resolved Jul 31, 2010 Surface Water Treatment Rule
Jul 1, 2010 Jul 31, 2010 Surface Water Treatment Rule MR No Yes — — — Resolved Jul 31, 2010 Surface Water Treatment Rule
Jul 1, 2010 Jul 31, 2010 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Jul 31, 2010 Interim and Long Term 1 Enhanced 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 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, 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, 2009 Dec 31, 2009 Styrene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2009 Volatile Organic Chemicals
Jan 1, 2009 Dec 31, 2009 Xylenes, Total MR No Yes — 10 mg/L — Resolved Dec 31, 2009 Volatile Organic Chemicals
Jan 1, 2009 Dec 31, 2009 Xylenes, Total MR No Yes — 10 mg/L — Resolved Dec 31, 2009 Volatile Organic Chemicals
Jan 1, 2009 Dec 31, 2009 o-Dichlorobenzene MR No Yes — 0.6 mg/L — Resolved Dec 31, 2009 Volatile Organic Chemicals
Jan 1, 2009 Dec 31, 2009 o-Dichlorobenzene MR No Yes — 0.6 mg/L — Resolved Dec 31, 2009 Volatile Organic Chemicals
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 Ethylbenzene MR No Yes — 0.7 mg/L — Resolved Dec 31, 2009 Volatile Organic Chemicals
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 trans-1,2-Dichloroethylene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2009 Volatile Organic Chemicals
Jan 1, 2009 Dec 31, 2009 1,1-Dichloroethylene MR No Yes — 0.007 mg/L — Resolved Dec 31, 2009 Volatile Organic Chemicals
Jan 1, 2009 Dec 31, 2009 p-Dichlorobenzene MR No Yes — 0.075 mg/L — Resolved Dec 31, 2009 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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