Public Water Partners

LAKE OSWEGO, OR · Clackamas County

LAKE OSWEGO MUNICIPAL WATER Water System

Consumer Confidence Report status

LAKE OSWEGO MUNICIPAL WATER must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for LAKE OSWEGO MUNICIPAL WATER.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Oregon’s official records. Always confirm current status with Oregon before making decisions based on this information.

System facts

System ID (PWSID)
OR4100457
System type
Community Water System
Population served
40,000
Service connections
13,000
Ownership
local government
Water source
surface water (rivers, lakes, or reservoirs)

LAKE OSWEGO MUNICIPAL WATER is among the 17 largest community water systems in Oregon, serving 40,000 people from surface water.

As of August 1, 2026, its federal record holds 24 entries between 1976 and 2025, all of which EPA lists as closed.

Of the 24, 21 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves volatile organic chemicals, the Consumer Confidence Rule, and the Radionuclides and Revised Rad Rule.

Violation history

  • Consumer Confidence Report Complete Failure to Report

    —

    Consumer Confidence Rule

    July 1, 2025 – September 2, 2025

    Resolved

  • Consumer Confidence Report Complete Failure to Report

    —

    Consumer Confidence Rule

    July 1, 2024 – July 3, 2024

    Resolved

  • Monitoring, Regular

    —

    1,1-Dichloroethylene

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    Tetrachloroethylene

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    CHLOROBENZENE

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    Benzene

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    Toluene

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    2,4-D

    January 1, 2008 – March 31, 2008

    Resolved

  • Monitoring, Regular

    —

    1,2,4-Trichlorobenzene

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    cis-1,2-Dichloroethylene

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    Xylenes, Total

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    DICHLOROMETHANE

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    o-Dichlorobenzene

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    p-Dichlorobenzene

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    Vinyl chloride

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    1,2-Dichloroethane

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    1,1,1-Trichloroethane

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    Carbon tetrachloride

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    1,2-Dichloropropane

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    Trichloroethylene

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    Nitrate

    January 1, 2002 – December 31, 2002

    Resolved

  • OCCT/SOWT Treatment Installation/Demonstration

    Health-based

    Lead and Copper Rule

    January 1, 2000 – March 1, 2000

    Resolved

  • Monitoring, Regular

    —

    Combined Radium (-226 and -228)

    June 1, 1976 – May 31, 1980

    Archived

  • Monitoring, Regular

    —

    Gross Alpha, Excl. Radon and U

    June 1, 1976 – May 31, 1980

    Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

Common questions

Is LAKE OSWEGO MUNICIPAL WATER required to publish a Consumer Confidence Report?

Yes. LAKE OSWEGO MUNICIPAL WATER is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is LAKE OSWEGO MUNICIPAL WATER’s next Consumer Confidence Report due?

LAKE OSWEGO MUNICIPAL WATER’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

Does LAKE OSWEGO MUNICIPAL WATER have any open drinking water violations on record?

As of August 1, 2026, EPA's federal records show no open violations for LAKE OSWEGO MUNICIPAL WATER.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

LAKE OSWEGO MUNICIPAL WATER

503-635-0280

LAKE OSWEGO, OR 97035