Water Quality: Lewiston, CA
2 water systems • 173 people served
Some ConcernsWater Quality Summary
Lewiston is served by 2 public water systems with a combined service population of 173 people, and has 11 EPA Safe Drinking Water Act violations on record. Critically, 2 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Lewiston's violation count is 77% below the national average for California. Contaminants associated with violations include Fecal Coliform, Stage 2 DBP.
Contaminants Found
Indicates direct fecal contamination; associated with diarrhea, cramps, nausea, and potential severe illness.
Common source: Human and animal fecal waste
EPA limit: Zero tolerance (any positive triggers violations)
Trihalomethanes and haloacetic acids that increase cancer risk and may cause adverse reproductive outcomes.
Common source: Chlorine disinfection reacting with natural organic matter in source water
EPA limit: TTHM: 0.080 mg/L; HAA5: 0.060 mg/L
Water Systems Serving Lewiston
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| TREASURE CREEK WOODS MWC | CA5301101 | Groundwater | 131 | 4 |
| BUCKTAIL MUTUAL WATER COMPANY | CA5301001 | Groundwater | 42 | 7 |
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 California
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.