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MONMOUTH, CITY OF

Oregon — Community Water System — PWSID: OR4100537

System Information

PWSIDOR4100537
System NameMONMOUTH, CITY OF
System TypeCommunity Water System
Water SourceGround Water Under Influence
Activity StatusActive
Owner TypeLocal
EPA Region10
Serves SchoolNo
WholesalerNo
First ReportedMar 12, 1979
Last ReportedDec 23, 2025

Location & Contact

StateOregon
CityMONMOUTH
ZIP Code97361
Address151 W MAIN ST
OrganizationMONMOUTH, CITY OF
Phone503-838-2173

Population & Service

Population Served11,651
Service Connections3,027

Drinking Water Violations (32)

This water system has 32 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
Jan 1, 2023 Mar 31, 2023 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Mar 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2023 Mar 31, 2023 TTHM MR No Yes — 0.080 mg/L — Resolved Mar 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Aug 1, 2021 Aug 31, 2021 Surface Water Treatment Rule MR No Yes — — — Resolved Aug 31, 2021 Surface Water Treatment Rule
Aug 1, 2021 Aug 31, 2021 Surface Water Treatment Rule MR No Yes — — — Resolved Aug 31, 2021 Surface Water Treatment Rule
Aug 1, 2021 Aug 31, 2021 Revised Total Coliform Rule MON No No — — — Resolved Aug 31, 2021 Revised Total Coliform Rule
Jul 1, 2021 — Lead and Copper Rule MR No No — TT — Resolved Oct 7, 2021 Lead and Copper Rule
Apr 1, 2020 Apr 30, 2020 Surface Water Treatment Rule MR No Yes — — — Resolved Apr 30, 2020 Surface Water Treatment Rule
Apr 1, 2020 Apr 30, 2020 Surface Water Treatment Rule MR No Yes — — — Resolved Apr 30, 2020 Surface Water Treatment Rule
Jan 1, 2020 — Lead and Copper Rule MR No No — TT — Resolved Jun 1, 2020 Lead and Copper Rule
Nov 2, 2015 — Surface Water Treatment Rule TT Yes No — — — Resolved Feb 22, 2019 Surface Water Treatment Rule
Nov 2, 2015 — Surface Water Treatment Rule TT Yes No — — — Resolved Feb 22, 2019 Surface Water Treatment Rule
Feb 1, 2014 Feb 28, 2014 Groundwater Rule MR No Yes — — — Resolved Feb 28, 2014 Ground Water Rule
Jan 1, 2014 Sep 30, 2014 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2014 Sep 30, 2014 TTHM MR No Yes — 0.080 mg/L — Resolved Sep 30, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2013 Jan 31, 2013 Groundwater Rule MR No Yes — — — Resolved Jan 31, 2013 Ground Water Rule
Jan 1, 2013 Jan 31, 2013 Groundwater Rule MR No Yes — — — Resolved Jan 31, 2013 Ground Water Rule
Oct 1, 2008 Dec 31, 2008 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2008 Nitrate Rule
Jul 1, 2008 Sep 30, 2008 Nitrate MR No Yes — 10 mg/L — Resolved Sep 30, 2008 Nitrate Rule
Jan 1, 2000 Dec 31, 2000 Nitrate MCL Yes No 12.1 MG/L 10 mg/L — Resolved Dec 31, 2000 Nitrate Rule
Jan 1, 2000 Dec 31, 2000 Nitrate MCL Yes No 12.1 MG/L 10 mg/L — Resolved Dec 31, 2000 Nitrate Rule
Dec 1, 1998 Dec 31, 1998 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Dec 31, 1998 Total Coliform Rule
Dec 1, 1998 Dec 31, 1998 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Dec 31, 1998 Total Coliform Rule
Dec 1, 1998 Dec 31, 1998 Coliform (TCR) MR No No — 5% of samples — Resolved Dec 31, 1998 Total Coliform Rule
Dec 1, 1995 Dec 31, 1995 Coliform (TCR) MR No No — 5% of samples — Resolved Dec 31, 1995 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
— — — No No — — — — — —
— — — No No — — — — — —
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— — — No No — — — — — —
— — — No No — — — — — —
— — — No No — — — — — —

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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