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THE DALLES, CITY OF

Oregon — Community Water System — PWSID: OR4100869

System Information

PWSIDOR4100869
System NameTHE DALLES, 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
CityTHE DALLES
ZIP Code97058
Address6780 RESERVOIR RD
OrganizationTHE DALLES, CITY OF
Phone541-298-2248

Population & Service

Population Served13,010
Service Connections5,408

Drinking Water Violations (26)

This water system has 26 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, 2025 Sep 30, 2025 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Archived Sep 30, 2025 Radionuclides and Revised Rad Rule
Jul 1, 2025 Sep 30, 2025 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Archived Sep 30, 2025 Radionuclides and Revised Rad Rule
Jul 1, 2025 Sep 30, 2025 TTHM MR No Yes — 0.080 mg/L — Archived Sep 30, 2025 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2025 Sep 30, 2025 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Archived Sep 30, 2025 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2023 Jul 31, 2023 Surface Water Treatment Rule MR No Yes — — — Resolved Jul 31, 2023 Surface Water Treatment Rule
Jul 1, 2023 Jul 31, 2023 Surface Water Treatment Rule MR No Yes — — — Resolved Jul 31, 2023 Surface Water Treatment Rule
Jul 1, 2023 — Lead and Copper Rule MR No No — TT — Resolved Sep 7, 2023 Lead and Copper Rule
Jul 1, 2023 — Lead and Copper Rule MR No No — TT — Resolved Sep 7, 2023 Lead and Copper Rule
Jul 1, 2023 Jul 31, 2023 Interim Enhanced Surface Water Treatment Rule MR No Yes — — — Resolved Jul 31, 2023 Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Jul 1, 2023 — Lead and Copper Rule MR No No — TT — Resolved Sep 7, 2023 Lead and Copper Rule
Jul 1, 2023 — Lead and Copper Rule MR No No — TT — Resolved Sep 7, 2023 Lead and Copper Rule
Jul 1, 2023 — Lead and Copper Rule MR No No — TT — Resolved Jan 5, 2024 Lead and Copper Rule
Jan 1, 2019 Mar 31, 2019 TTHM MR No Yes — 0.080 mg/L — Resolved Mar 31, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2019 Mar 31, 2019 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Mar 31, 2019 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, 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
Mar 1, 2009 Mar 31, 2009 Coliform (TCR) MR No No — 5% of samples — Resolved Mar 31, 2009 Total Coliform Rule
Mar 1, 2009 Mar 31, 2009 Coliform (TCR) MR No No — 5% of samples — Resolved Mar 31, 2009 Total Coliform Rule
Feb 1, 2005 Feb 28, 2005 Coliform (TCR) MR No No — 5% of samples — Resolved Feb 28, 2005 Total Coliform Rule
Feb 1, 2005 Feb 28, 2005 Coliform (TCR) MR No No — 5% of samples — Resolved Feb 28, 2005 Total Coliform Rule
Oct 1, 2002 Oct 31, 2002 Surface Water Treatment Rule MR No Yes — — — Resolved Oct 31, 2002 Surface Water Treatment Rule
Apr 1, 2002 Apr 30, 2002 Surface Water Treatment Rule MR No Yes — — — Resolved Apr 30, 2002 Surface Water Treatment 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

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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