Water Quality: Ukiah, CA
8 water systems • 33,008 people served
Some ConcernsWater Quality Summary
Ukiah is served by 8 public water systems with a combined service population of 33,008 people, and has 25 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. Ukiah's violation count is 48% below the national average for California. Contaminants associated with violations include Chlorine, Fecal Coliform.
Contaminants Found
Eye and nose irritation at high levels; long-term exposure above the MCL may cause liver and kidney damage.
Common source: Water treatment disinfectant added to kill harmful microorganisms
EPA limit: 4.0 mg/L (MRDL — Maximum Residual Disinfectant Level)
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)
Water Systems Serving Ukiah
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| UKIAH, CITY OF | CA2310003 | Surface Water | 16,607 | 1 |
| MILLVIEW COUNTY WATER DISTRICT | CA2310006 | Surface Water | 5,500 | 0 |
| REDWOOD VALLEY COUNTY WATER DISTRICT | CA2310008 | Surface Water | 5,200 | 3 |
| WILLOW COUNTY WATER DISTRICT | CA2310005 | Surface Water | 3,797 | 9 |
| HOPLAND PUBLIC UTILITY DISTRICT | CA2310010 | Groundwater | 1,076 | 3 |
| CALPELLA COUNTY WATER DISTRICT | CA2300507 | Surface Water | 548 | 4 |
| RIVER ESTATES MUTUAL WATER COMPANY | CA2300605 | Groundwater | 250 | 2 |
| COVELO MOBILE HOME PARK | CA2300892 | Groundwater | 30 | 3 |
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.