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DAYTON, CITY OF

Oregon — Community Water System — PWSID: OR4100252

System Information

PWSIDOR4100252
System NameDAYTON, CITY OF
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region10
Serves SchoolNo
WholesalerNo
First ReportedMar 12, 1979
Last ReportedDec 23, 2025

Location & Contact

StateOregon
CityDAYTON
ZIP Code97114
AddressPO BOX 339
OrganizationDAYTON, CITY OF
Phone503-864-2221

Population & Service

Population Served2,535
Service Connections904

Drinking Water Violations (101)

This water system has 101 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, 2024 — Consumer Confidence Rule Other No No — — — Resolved Jul 11, 2024 Consumer Confidence Rule
Dec 1, 2020 Dec 31, 2020 Groundwater Rule MR No Yes — — — Resolved Dec 31, 2020 Ground Water Rule
Nov 1, 2018 Nov 30, 2018 Groundwater Rule TT Yes No — — — Resolved Nov 30, 2018 Ground Water Rule
Nov 1, 2018 Nov 30, 2018 Groundwater Rule TT Yes No — — — Resolved Nov 30, 2018 Ground Water Rule
Nov 1, 2018 Nov 30, 2018 Groundwater Rule TT Yes No — — — Resolved Nov 30, 2018 Ground Water Rule
Jul 1, 2015 Jul 31, 2015 Groundwater Rule MR No Yes — — — Resolved Jul 31, 2015 Ground Water Rule
Sep 1, 2010 Sep 30, 2010 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2010 Total Coliform Rule
Sep 1, 2010 Sep 30, 2010 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2010 Total Coliform Rule
Aug 1, 2010 — E. COLI MR No Yes — — — Unaddressed — Ground Water Rule
Aug 1, 2010 — E. COLI MR No Yes — — — Unaddressed — Ground Water Rule
Jan 1, 2010 Jan 31, 2010 Coliform (TCR) MR No No — 5% of samples — Resolved Jan 31, 2010 Total Coliform Rule
Jan 1, 2010 Jan 31, 2010 Coliform (TCR) MR No No — 5% of samples — Resolved Jan 31, 2010 Total Coliform Rule
Jan 1, 2009 Dec 31, 2009 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2009 Nitrate Rule
Jan 1, 2009 Dec 31, 2009 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2009 Nitrate Rule
Sep 1, 2007 Sep 30, 2007 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Sep 30, 2007 Total Coliform Rule
Jan 1, 2005 Dec 31, 2005 Nitrate MR No Yes — 10 mg/L — Archived Dec 31, 2005 Nitrate Rule
Jan 1, 2005 — Lead and Copper Rule MR No No — TT — Resolved Jan 23, 2006 Lead and Copper Rule
Jan 1, 2005 Dec 31, 2005 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2005 Nitrate Rule
Sep 1, 2003 Sep 30, 2003 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2003 Total Coliform Rule
Aug 1, 2003 Aug 31, 2003 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 2003 Total Coliform Rule
Jul 1, 2003 Jul 31, 2003 Coliform (TCR) MR No No — 5% of samples — Resolved Jul 31, 2003 Total Coliform Rule
Jun 1, 2003 Jun 30, 2003 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jun 30, 2003 Total Coliform Rule
Jan 1, 2003 Dec 31, 2003 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2003 Nitrate Rule
Jan 1, 2003 Dec 31, 2003 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2003 Nitrate Rule
Jan 1, 2003 Dec 31, 2003 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2003 Nitrate Rule
Jan 1, 2003 Dec 31, 2003 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2003 Nitrate Rule
Jan 1, 2003 Jan 31, 2003 Coliform (TCR) MR No No — 5% of samples — Resolved Jan 31, 2003 Total Coliform Rule
Jan 1, 2002 Dec 31, 2004 Arsenic MR No Yes — 0.010 mg/L — Resolved Dec 31, 2004 Arsenic Rule
Jan 1, 2002 Dec 31, 2004 Cadmium MR No Yes — 0.005 mg/L — Resolved Dec 31, 2004 Inorganic Chemicals
Jan 1, 2002 Dec 31, 2004 Chromium MR No Yes — 0.1 mg/L — Resolved Dec 31, 2004 Inorganic Chemicals
Jan 1, 2002 Dec 31, 2004 CYANIDE MR No Yes — 0.2 mg/L — Resolved Dec 31, 2004 Inorganic Chemicals
Jan 1, 2002 Dec 31, 2004 Beryllium, Total MR No Yes — 0.004 mg/L — Resolved Dec 31, 2004 Inorganic Chemicals
Jan 1, 2002 Dec 31, 2004 Selenium MR No Yes — 0.05 mg/L — Resolved Dec 31, 2004 Inorganic Chemicals
Jan 1, 2002 Dec 31, 2004 1,2,4-Trichlorobenzene MR No Yes — 0.07 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Xylenes, Total MR No Yes — 10 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 DICHLOROMETHANE MR No Yes — 0.005 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Vinyl chloride MR No Yes — 0.002 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 trans-1,2-Dichloroethylene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 1,2-Dichloroethane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 1,2-Dichloropropane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Benzene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Toluene MR No Yes — 1 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Ethylbenzene MR No Yes — 0.7 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Styrene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2004 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Endrin MR No Yes — 0.002 mg/L — Resolved Dec 31, 2004 Synthetic Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2004 Synthetic Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Toxaphene MR No Yes — 0.003 mg/L — Resolved Dec 31, 2004 Synthetic Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Dalapon MR No Yes — 0.2 mg/L — Resolved Dec 31, 2004 Synthetic Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Diquat MR No Yes — 0.02 mg/L — Resolved Dec 31, 2004 Synthetic Organic Chemicals
Jan 1, 2002 Dec 31, 2004 Glyphosate MR No Yes — 0.7 mg/L — Resolved Dec 31, 2004 Synthetic 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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