EPA EXPORT · 13 SEP 2026FEDERAL COMPLIANCE RECORDS · NOT A HOME WATER TEST
TAP WATERLEDGERPublic system compliance records
PUBLIC WATER SYSTEM RECORDPWSID OR4100457

Oregon · Surface water purchased

Lake Oswego Municipal Water

EPA’s September 2026 export lists Lake Oswego Municipal Water (PWSID OR4100457) as No current violation flagged, serving a reported 40,000 people from a surface water purchased source, with 0 rules in current violation.

Source: EPA SDWIS system-search export · Snapshot 13 Sep 2026 · Federal compliance fields

CURRENT EXPORTNo current violation flaggedNo current violation is flagged in this EPA export. This is not a household water test.
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01 / CURRENT FLAGS

EPA compliance flags for Lake Oswego Municipal Water

Lake Oswego Municipal Water is listed as no current violation flagged in the current export; the five federal flag categories remain separate below.

  • NOT FLAGGED
    Health-based violationCurrent HEALTH_FLAG in the EPA export.
  • NOT FLAGGED
    Monitoring and reportingCurrent MR_FLAG in the EPA export.
  • NOT FLAGGED
    Public notificationCurrent PN_FLAG in the EPA export.
  • NOT FLAGGED
    Other violationCurrent OTHER_FLAG in the EPA export.
  • NOT FLAGGED
    Serious violatorCurrent serious-violator status in the EPA export.
Important limit

This page is not a household water test. A clear federal flag does not prove every home has safe water, and a flag is not a measurement at your faucet. Plumbing, service lines, local sampling, private wells, and newer events may not be reflected here.

02 / VIOLATION RECORD

Quarters with violations2rolling history field
Quarters with SNC0significant noncompliance
Rules in current violation0EPA export count
Rules in 3-year window1EPA export count

Current rule entries for Lake Oswego Municipal Water

EPA supplied 1 current contaminant, rule, or violation-category entries for Lake Oswego Municipal Water in the exported fields used here.

  • Other Violation

Three-year entries for Lake Oswego Municipal Water

EPA supplied 0 contaminant or rule entries for Lake Oswego Municipal Water in the three-year history field.

  • No three-year contaminant or rule names were supplied in this export field.

03 / OVERSIGHT & COVERAGE

Visits and sanitary surveys for Lake Oswego Municipal Water

The export lists 2 site visits in five years and 1 significant deficiencies for Lake Oswego Municipal Water.

Site visits, past 5 years
2
Inspection visits
0
Other visits
2
Last sanitary survey
10/16/2025
Last recorded visit
10/16/2025
Significant deficiencies
1

Places served by Lake Oswego Municipal Water

EPA associates Lake Oswego Municipal Water with the listed cities, counties, ZIP codes, and Oregon service area identifiers.

State / territory
Oregon
Cities
Not supplied
Counties
Clackamas
ZIP codes
Not supplied
Federal PWSID
OR4100457
Registry ID
110013268043

04 / HOW TO USE THIS RECORD

Current public records for Lake Oswego Municipal Water

EPA’s facility report, the Oregon drinking-water program, and Lake Oswego Municipal Water’s Consumer Confidence Report are the current public records beyond this September 2026 snapshot.

Confirm current conditions with the utility's latest Consumer Confidence Report, your state drinking-water program, and the EPA facility report. For household concerns, ask a qualified local laboratory about tap testing.

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