LAKE OSWEGO, OR · Clackamas County
LAKE OSWEGO MUNICIPAL WATER Water System
Current status
No open violations on record as of July 4, 2026.
This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 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)
Violation history
Consumer Confidence Report Complete Failure to Report
—Consumer Confidence Rule
July 1, 2025 – September 2, 2025
ResolvedMonitoring, Regular
—1,1-Dichloroethylene
January 1, 2008 – December 31, 2008
ResolvedMonitoring, Regular
—Benzene
January 1, 2008 – December 31, 2008
ResolvedMonitoring, Regular
—Toluene
January 1, 2008 – December 31, 2008
ResolvedMonitoring, Regular
—Ethylbenzene
January 1, 2008 – December 31, 2008
ResolvedMonitoring, Regular
—2,4-D
January 1, 2008 – March 31, 2008
ResolvedMonitoring, Regular
—1,2,4-Trichlorobenzene
January 1, 2008 – December 31, 2008
ResolvedMonitoring, Regular
—cis-1,2-Dichloroethylene
January 1, 2008 – December 31, 2008
ResolvedMonitoring, Regular
—Xylenes, Total
January 1, 2008 – December 31, 2008
ResolvedMonitoring, Regular
—DICHLOROMETHANE
January 1, 2008 – December 31, 2008
ResolvedMonitoring, Regular
—o-Dichlorobenzene
January 1, 2008 – December 31, 2008
ResolvedMonitoring, Regular
—p-Dichlorobenzene
January 1, 2008 – December 31, 2008
ResolvedMonitoring, Regular
—1,2-Dichloroethane
January 1, 2008 – December 31, 2008
ResolvedMonitoring, Regular
—1,1,1-Trichloroethane
January 1, 2008 – December 31, 2008
ResolvedMonitoring, Regular
—Carbon tetrachloride
January 1, 2008 – December 31, 2008
ResolvedMonitoring, Regular
—1,2-Dichloropropane
January 1, 2008 – December 31, 2008
ResolvedMonitoring, Regular
—Trichloroethylene
January 1, 2008 – December 31, 2008
ResolvedMonitoring, Regular
—CHLOROBENZENE
January 1, 2008 – December 31, 2008
ResolvedMonitoring, Regular
—Nitrate
January 1, 2002 – December 31, 2002
ResolvedMonitoring, Regular
—Combined Radium (-226 and -228)
June 1, 1976 – May 31, 1980
ArchivedMonitoring, 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)
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| July 1, 2025 – September 2, 2025 | Consumer Confidence Report Complete Failure to Report | Consumer Confidence Rule | — | Resolved |
| January 1, 2008 – December 31, 2008 | Monitoring, Regular | 1,1-Dichloroethylene | — | Resolved |
| January 1, 2008 – December 31, 2008 | Monitoring, Regular | Benzene | — | Resolved |
| January 1, 2008 – December 31, 2008 | Monitoring, Regular | Toluene | — | Resolved |
| January 1, 2008 – December 31, 2008 | Monitoring, Regular | Ethylbenzene | — | Resolved |
| January 1, 2008 – March 31, 2008 | Monitoring, Regular | 2,4-D | — | Resolved |
| January 1, 2008 – December 31, 2008 | Monitoring, Regular | 1,2,4-Trichlorobenzene | — | Resolved |
| January 1, 2008 – December 31, 2008 | Monitoring, Regular | cis-1,2-Dichloroethylene | — | Resolved |
| January 1, 2008 – December 31, 2008 | Monitoring, Regular | Xylenes, Total | — | Resolved |
| January 1, 2008 – December 31, 2008 | Monitoring, Regular | DICHLOROMETHANE | — | Resolved |
| January 1, 2008 – December 31, 2008 | Monitoring, Regular | o-Dichlorobenzene | — | Resolved |
| January 1, 2008 – December 31, 2008 | Monitoring, Regular | p-Dichlorobenzene | — | Resolved |
| January 1, 2008 – December 31, 2008 | Monitoring, Regular | 1,2-Dichloroethane | — | Resolved |
| January 1, 2008 – December 31, 2008 | Monitoring, Regular | 1,1,1-Trichloroethane | — | Resolved |
| January 1, 2008 – December 31, 2008 | Monitoring, Regular | Carbon tetrachloride | — | Resolved |
| January 1, 2008 – December 31, 2008 | Monitoring, Regular | 1,2-Dichloropropane | — | Resolved |
| January 1, 2008 – December 31, 2008 | Monitoring, Regular | Trichloroethylene | — | Resolved |
| January 1, 2008 – December 31, 2008 | Monitoring, Regular | CHLOROBENZENE | — | Resolved |
| January 1, 2002 – December 31, 2002 | Monitoring, Regular | Nitrate | — | Resolved |
| June 1, 1976 – May 31, 1980 | Monitoring, Regular | Combined Radium (-226 and -228) | — | Archived |
| June 1, 1976 – May 31, 1980 | Monitoring, Regular | Gross Alpha, Excl. Radon and U | — | Archived |
Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)
Enforcement actions
- September 2, 2025State Compliance achieved1 linked violation
- July 3, 2024State Compliance achieved1 linked violation
- April 8, 2019State Compliance achieved1 linked violation
- September 28, 2009State Violation/Reminder Notice1 linked violation
- March 16, 2009State Compliance achieved2 linked violations
- June 3, 2003State Compliance achieved2 linked violations
- March 1, 2000State Compliance achieved2 linked violations
- March 25, 1998State Administrative/Compliance Order with penalty issued1 linked violation
Contact
LAKE OSWEGO MUNICIPAL WATER
503-635-0280
LAKE OSWEGO, OR 97035