Public water system record
Lake Oswego Municipal Water
Serves Lake Oswego, Clackamas County, OR · 40,000 people served
Federal records show no health-based violations and 3 monitoring/reporting issues for Lake Oswego Municipal Water in the last ten years.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 3
Key facts
- Lake Oswego Municipal Water buys its water from Lake Oswego - Tigard Water Supply.
- Most recent formal enforcement: compliance order with a penalty by Oregon, March 1998.
- Record on file since 1976, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 12,541 service lines.
Check whether Lake Oswego Municipal Water serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
None since October 2016.
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2025 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2024 | Resolved |
|
Bromate
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
Full record since 1976
EPA's records for Lake Oswego Municipal Water go back to 1976. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 32 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1970s | 0 | 2 |
| 1990s | 0 | 4 |
| 2000s | 1 | 26 |
| October 19, 2016 to 2019 | 0 | 1 |
| 2020s | 0 | 2 |
Most recent health-based violation before October 19, 2016: Lead and Copper Rule, began January 2000, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Lead and Copper Rule
Treatment technique failure
|
Jan 1, 2000 | Resolved |
Enforcement actions
Oregon regulators took 1 formal enforcement action against Lake Oswego Municipal Water in 1998. The most recent was a compliance order with a penalty in March 1998.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Mar 25, 1998 | Oregon | Compliance order with a penalty | 1 violation (1 health-based): Lead and Copper Rule |
Where the water comes from
Lake Oswego Municipal Water buys its water from Lake Oswego - Tigard Water Supply. It lists no wells or intakes of its own. 1 other community water system buys water from Lake Oswego Municipal Water.
Buys water from
- Lake Oswego - Tigard Water Supply West Linn, OR
Community systems that buy water from it
- Lake Grove Water District Lake Oswego, OR
Annual water quality report
Lake Oswego Municipal Water must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Oregon.
Certified drinking water labs by state EPA guidance for private wells