LAKE OSWEGO MUNICIPAL WATER Water Quality Report
Population
40,000
people served
Water Source
🌊 Surface
rivers, lakes, reservoirs
National Rank
Top 90%
of 49,184 US systems
5-Year Record
⚠️ 3
violations recorded
C
Fair
Safety Grade
3 violations in the past 5 years, including 1 health-based
System Details
- PWSID
- OR4100457
- Population Served
- 40,000
- Water Source
- Surface Water
- Owner
- Local Government
- State
- Oregon
- EPA Region
- 10
Contaminants of Concern
| Contaminant | Status | Violations |
|---|---|---|
| Contaminant 5000 | ✕ Health-Based | 1 |
| Contaminant 1011 | ⚠ Monitoring/Reporting | 1 |
| Contaminant 7000 | ⚠ Monitoring/Reporting | 3 |
Violation History
2025
1
2024
2
2019
1
2000
1
Total violations on record: 5
Service Area
Cities Served
ZIP Codes Served
How does this compare?
This systemNational average
Grade C
Avg: B-C
5violations total
18% of national average
National avg: ~28 per system
📍 Mid-to-large system — serves 6× the national average.