THE DALLES, CITY OF Water Quality Report
Population
13,010
people served
Water Source
🌊 Surface
rivers, lakes, reservoirs
National Rank
Top 90%
of 49,184 US systems
5-Year Record
⚠️ 27
violations recorded
C
Fair
Safety Grade
27 violations in the past 5 years
System Details
- PWSID
- OR4100869
- Population Served
- 13,010
- Water Source
- Surface Water
- Owner
- Local Government
- State
- Oregon
- EPA Region
- 10
Contaminants of Concern
| Contaminant | Status | Violations |
|---|---|---|
| Total Trihalomethanes (TTHMs) | ⚠ Monitoring/Reporting | 7 |
| Haloacetic Acids (HAA5) | ⚠ Monitoring/Reporting | 7 |
| Contaminant 0200 | ⚠ Monitoring/Reporting | 6 |
| Contaminant 0300 | ⚠ Monitoring/Reporting | 3 |
| Contaminant 5000 | ⚠ Monitoring/Reporting | 14 |
| Radium-226 | ⚠ Monitoring/Reporting | 1 |
| Gross Alpha | ⚠ Monitoring/Reporting | 1 |
Violation History
2025
4
2023
23
2019
6
2018
6
Total violations on record: 39
Service Area
Cities Served
ZIP Codes Served
Recommended Water Filters
Based on contaminants detected in this water system:
Reverse Osmosis System
Removes up to 99% of contaminants including PFAS, lead, arsenic, and nitrates
Removes: Radium-226
Activated Carbon Filter
Effective for chlorine, THMs, pesticides, and taste/odor improvement
Removes: Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5)
How does this compare?
This systemNational average
Grade C
Avg: B-C
39violations total
139% of national average
National avg: ~28 per system
📍 Average-sized water system.