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TAMOSHAN

Washington — Community Water System — PWSID: WA5387140

System Information

PWSIDWA5387140
System NameTAMOSHAN
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
CityOlympia
ZIP Code98512
Address9605 Tilley Rd. South
OrganizationTAMOSHAN
Phone—

Population & Service

Population Served260
Service Connections94

Drinking Water Violations (37)

This water system has 37 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
Jun 1, 2025 Jun 30, 2025 Revised Total Coliform Rule MON No Yes — — — Resolved Jun 30, 2025 Revised Total Coliform Rule
Apr 1, 2023 Jun 30, 2023 Total Haloacetic Acids (HAA5) MCL Yes No 61 UG/L 0.060 mg/L — Resolved Jun 30, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2023 Jun 30, 2023 Total Haloacetic Acids (HAA5) MCL Yes No 61 UG/L 0.060 mg/L — Resolved Jun 30, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2023 Mar 31, 2023 Total Haloacetic Acids (HAA5) MCL Yes No 76.1 UG/L 0.060 mg/L — Resolved Mar 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2023 Mar 31, 2023 Total Haloacetic Acids (HAA5) MCL Yes No 76.1 UG/L 0.060 mg/L — Resolved Mar 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2022 Dec 31, 2022 Total Haloacetic Acids (HAA5) MCL Yes No 95.4 UG/L 0.060 mg/L — Resolved Dec 31, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2022 Dec 31, 2022 Total Haloacetic Acids (HAA5) MCL Yes No 95.4 UG/L 0.060 mg/L — Resolved Dec 31, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2022 Sep 30, 2022 Total Haloacetic Acids (HAA5) MCL Yes No 102.8 UG/L 0.060 mg/L — Resolved Sep 30, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2022 Sep 30, 2022 Total Haloacetic Acids (HAA5) MCL Yes No 102.8 UG/L 0.060 mg/L — Resolved Sep 30, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2022 Jun 30, 2022 Total Haloacetic Acids (HAA5) MCL Yes No 107.1 UG/L 0.060 mg/L — Resolved Jun 30, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2022 Jun 30, 2022 Total Haloacetic Acids (HAA5) MCL Yes No 107.1 UG/L 0.060 mg/L — Resolved Jun 30, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2022 Mar 31, 2022 Total Haloacetic Acids (HAA5) MCL Yes No 113.7 UG/L 0.060 mg/L — Resolved Mar 31, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2022 Mar 31, 2022 Total Haloacetic Acids (HAA5) MCL Yes No 113.7 UG/L 0.060 mg/L — Resolved Mar 31, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Dec 1, 2021 Dec 31, 2021 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2021 Revised Total Coliform Rule
Nov 1, 2021 Nov 30, 2021 Revised Total Coliform Rule MON No Yes — — — Resolved Nov 30, 2021 Revised Total Coliform Rule
Oct 1, 2021 Dec 31, 2021 Total Haloacetic Acids (HAA5) MCL Yes No 102.8 UG/L 0.060 mg/L — Resolved Dec 31, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2021 Dec 31, 2021 Total Haloacetic Acids (HAA5) MCL Yes No 102.8 UG/L 0.060 mg/L — Resolved Dec 31, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2021 Sep 30, 2021 Total Haloacetic Acids (HAA5) MCL Yes No 100.8 UG/L 0.060 mg/L — Resolved Sep 30, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2021 Sep 30, 2021 Total Haloacetic Acids (HAA5) MCL Yes No 100.8 UG/L 0.060 mg/L — Resolved Sep 30, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2018 Dec 31, 2018 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2018 Dec 31, 2018 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2017 Jun 30, 2017 TTHM MCL Yes No 96.2 UG/L 0.080 mg/L — Resolved Jun 30, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2017 Jun 30, 2017 TTHM MCL Yes No 96.2 UG/L 0.080 mg/L — Resolved Jun 30, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2017 Jun 30, 2017 TTHM MCL Yes No 96.2 UG/L 0.080 mg/L — Resolved Jun 30, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2017 Mar 31, 2017 TTHM MCL Yes No 99.4 UG/L 0.080 mg/L — Resolved Mar 31, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2017 Mar 31, 2017 TTHM MCL Yes No 99.4 UG/L 0.080 mg/L — Resolved Mar 31, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2017 Mar 31, 2017 TTHM MCL Yes No 99.4 UG/L 0.080 mg/L — Resolved Mar 31, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2016 — Consumer Confidence Rule Other No No — — — Resolved Sep 29, 2016 Consumer Confidence Rule
Jul 1, 2015 — Consumer Confidence Rule Other No No — — — Resolved Aug 28, 2015 Consumer Confidence Rule
Jun 1, 1999 Jun 30, 1999 Coliform (TCR) MR No Yes — 5% of samples — Archived Jun 30, 1999 Total Coliform Rule
Sep 1, 1993 Sep 30, 1993 Coliform (TCR) MR No Yes — 5% of samples — Archived Sep 30, 1993 Total Coliform Rule
Dec 1, 1992 Dec 31, 1992 Coliform (TCR) MR No Yes — 5% of samples — Archived Dec 31, 1992 Total Coliform Rule
Nov 1, 1992 Nov 30, 1992 Coliform (TCR) MR No Yes — 5% of samples — Archived Nov 30, 1992 Total Coliform Rule
Oct 1, 1992 Oct 31, 1992 Coliform (TCR) MR No Yes — 5% of samples — Archived Oct 31, 1992 Total Coliform Rule
Dec 1, 1982 Sep 30, 1983 Cadmium MCL Yes No .02 0.005 mg/L .01 Archived Sep 30, 1983 Inorganic Chemicals
Oct 1, 1979 Oct 31, 1979 Gross Alpha, Excl. Radon and U MR No No — 15 pCi/L — Archived Oct 31, 1979 Radionuclides and Revised Rad Rule
— — — 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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