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Plymouth Water District

Washington — Community Water System — PWSID: WA5368045

System Information

PWSIDWA5368045
System NamePlymouth Water District
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region10
Serves SchoolNo
WholesalerNo
First ReportedFeb 7, 1981
Last ReportedDec 11, 2025

Location & Contact

StateWashington
CityWest Richland
ZIP Code99353
Address1434 Diamond Loop
OrganizationPlymouth Water District
Phone—

Population & Service

Population Served288
Service Connections109

Drinking Water Violations (626)

This water system has 626 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, 2023 — Consumer Confidence Rule Other No No — — — Resolved Oct 3, 2023 Consumer Confidence Rule
Jan 1, 2023 Dec 31, 2023 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2023 Inorganic Chemicals
Oct 1, 2022 Dec 31, 2022 1,2-Dichloroethane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 o-Dichlorobenzene MR No Yes — 0.6 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 Vinyl chloride MR No Yes — 0.002 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 1,1,2-Trichloroethane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 cis-1,2-Dichloroethylene MR No Yes — 0.07 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 Tetrachloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 1,1-Dichloroethylene MR No Yes — 0.007 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 DICHLOROMETHANE MR No Yes — 0.005 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 p-Dichlorobenzene MR No Yes — 0.075 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 trans-1,2-Dichloroethylene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 Ethylbenzene MR No Yes — 0.7 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 CHLOROBENZENE MR No Yes — 0.1 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 Benzene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 1,2,4-Trichlorobenzene MR No Yes — 0.07 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 1,2-Dichloropropane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 Trichloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 Styrene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Oct 1, 2022 Dec 31, 2022 Toluene MR No Yes — 1 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Jan 1, 2020 Dec 31, 2020 Nitrate MCL Yes No 11.6 MG/L 10 mg/L — Resolved Dec 31, 2020 Nitrate Rule
Jan 1, 2019 Dec 31, 2019 Nitrate MCL Yes No 12.2 MG/L 10 mg/L — Resolved Dec 31, 2019 Nitrate Rule
Jan 1, 2018 Dec 31, 2018 Nitrate MCL Yes No 13.6 MG/L 10 mg/L — Resolved Dec 31, 2018 Nitrate Rule
Jan 1, 2018 Dec 31, 2018 Nitrate MCL Yes No 12 MG/L 10 mg/L — Resolved Dec 31, 2018 Nitrate Rule
Jul 1, 2017 Sep 30, 2017 Nitrate MCL Yes No 14 MG/L 10 mg/L — Resolved Sep 30, 2017 Nitrate Rule
Jul 1, 2016 — Consumer Confidence Rule Other No No — — — Resolved Oct 31, 2016 Consumer Confidence Rule
Apr 1, 2016 Jun 30, 2016 Nitrate MCL Yes No 11 MG/L 10 mg/L — Resolved Jun 30, 2016 Nitrate Rule
Jan 1, 2016 Dec 31, 2016 Nitrate MCL Yes No 11.4 MG/L 10 mg/L — Resolved Dec 31, 2016 Nitrate Rule
Jul 1, 2015 — Consumer Confidence Rule Other No No — — — Resolved Sep 5, 2015 Consumer Confidence Rule
Jan 1, 2015 Dec 31, 2015 CHLOROBENZENE MR No Yes — 0.1 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 1,2,4-Trichlorobenzene MR No Yes — 0.07 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 1,2-Dichloropropane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 Benzene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 1,2-Dichloroethane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 o-Dichlorobenzene MR No Yes — 0.6 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 Styrene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 p-Dichlorobenzene MR No Yes — 0.075 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 trans-1,2-Dichloroethylene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 1,1,2-Trichloroethane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 1,1-Dichloroethylene MR No Yes — 0.007 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 Toluene MR No Yes — 1 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 Trichloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 Ethylbenzene MR No Yes — 0.7 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 Tetrachloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 Vinyl chloride MR No Yes — 0.002 mg/L — Resolved Dec 31, 2015 Volatile Organic Chemicals
Jan 1, 2015 Dec 31, 2015 DICHLOROMETHANE MR No Yes — 0.005 mg/L — Resolved Dec 31, 2015 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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