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LAKE OSWEGO MUNICIPAL WATER

Oregon — Community Water System — PWSID: OR4100457

System Information

PWSIDOR4100457
System NameLAKE OSWEGO MUNICIPAL WATER
System TypeCommunity Water System
Water SourceSurface Water Purchased
Activity StatusActive
Owner TypeLocal
EPA Region10
Serves SchoolNo
WholesalerNo
First ReportedMar 12, 1979
Last ReportedDec 23, 2025

Location & Contact

StateOregon
CityLAKE OSWEGO
ZIP Code97035
Address17601 PILKINGTON RD
OrganizationLAKE OSWEGO MUNICIPAL WATER
Phone503-534-5735

Population & Service

Population Served40,000
Service Connections13,000

Drinking Water Violations (38)

This water system has 38 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 — Consumer Confidence Rule Other No No — — — Resolved Sep 2, 2025 Consumer Confidence Rule
Jul 1, 2024 — Consumer Confidence Rule Other No No — — — Resolved Jul 3, 2024 Consumer Confidence Rule
Jan 1, 2019 Mar 31, 2019 Bromate MR No Yes — 0.010 mg/L — Resolved Mar 31, 2019 Stage 1 Disinfectants and Disinfection Byproducts Rule
Aug 1, 2009 Aug 31, 2009 Coliform (TCR) MR No No — 5% of samples — Resolved Aug 31, 2009 Total Coliform Rule
Aug 1, 2009 Aug 31, 2009 Coliform (TCR) MR No No — 5% of samples — Resolved Aug 31, 2009 Total Coliform Rule
Apr 1, 2008 Jun 30, 2008 2,4-D MR No Yes — 0.07 mg/L — Resolved Jun 30, 2008 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2008 1,2-Dichloropropane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 Trichloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 1,1-Dichloroethylene MR No Yes — 0.007 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 1,2-Dichloroethane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Mar 31, 2008 2,4-D MR No Yes — 0.07 mg/L — Resolved Mar 31, 2008 Synthetic Organic Chemicals
Jan 1, 2008 Dec 31, 2008 trans-1,2-Dichloroethylene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 o-Dichlorobenzene MR No Yes — 0.6 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2008 Nitrate Rule
Jan 1, 2008 Dec 31, 2008 Styrene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 Toluene MR No Yes — 1 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 1,2,4-Trichlorobenzene MR No Yes — 0.07 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 cis-1,2-Dichloroethylene MR No Yes — 0.07 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 Xylenes, Total MR No Yes — 10 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 DICHLOROMETHANE MR No Yes — 0.005 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 p-Dichlorobenzene MR No Yes — 0.075 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 Vinyl chloride MR No Yes — 0.002 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 1,1,2-Trichloroethane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 Tetrachloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 CHLOROBENZENE MR No Yes — 0.1 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 Benzene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2008 Ethylbenzene MR No Yes — 0.7 mg/L — Resolved Dec 31, 2008 Volatile Organic Chemicals
Jan 1, 2002 Dec 31, 2002 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2002 Nitrate Rule
Jan 1, 2000 — Lead and Copper Rule TT Yes No — TT — Resolved Mar 1, 2000 Lead and Copper Rule
Jan 1, 2000 — Lead and Copper Rule TT Yes No — TT — Resolved Mar 1, 2000 Lead and Copper Rule
Jan 1, 1996 Jan 31, 1996 Coliform (TCR) MR No No — 5% of samples — Resolved Jan 31, 1996 Total Coliform Rule
Dec 1, 1995 Dec 31, 1995 Coliform (TCR) MR No No — 5% of samples — Resolved Dec 31, 1995 Total Coliform Rule
Nov 1, 1995 Nov 30, 1995 Coliform (TCR) MR No No — 5% of samples — Resolved Nov 30, 1995 Total Coliform Rule
Oct 1, 1995 Oct 31, 1995 Coliform (TCR) MR No No — 5% of samples — Resolved Oct 31, 1995 Total Coliform 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
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

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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