Water Quality: Mattawa, WA
3 water systems • 5,361 people served
Multiple Health ViolationsWater Quality Summary
Mattawa is served by 3 public water systems with a combined service population of 5,361 people, and has 282 EPA Safe Drinking Water Act violations on record. Critically, 8 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Mattawa's violation count is 74% above the national average for Washington. Contaminants associated with violations include E. coli, Selenium.
Contaminants Found
Causes gastrointestinal illness; certain strains (e.g., O157:H7) can cause severe kidney failure and death.
Common source: Fecal contamination from humans or animals entering the water supply
EPA limit: Zero (no E. coli permitted in drinking water)
Hair loss, nail brittleness, and nervous system damage at elevated concentrations.
Common source: Natural geological deposits, mining discharges, oil refinery waste
EPA limit: 0.05 mg/L (50 ppb)
Water Systems Serving Mattawa
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| Mattawa City of | WA5352000 | Groundwater | 5,015 | 166 |
| SENTINEL GAP WATER ASSN | WA5376620 | Groundwater | 226 | 9 |
| BEVERLY WATER DISTRICT | WA5306350 | Groundwater | 120 | 107 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in Washington
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.