Is ALAMEDA COUNTY WATER DISTRICT's water safe to drink?
ALAMEDA COUNTY WATER DISTRICT has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 344,000 people get their water from it, across 86,959 connections.
How this compares nationally
4 total violations and 2 health-based ones put ALAMEDA COUNTY WATER DISTRICT at the 46th percentile nationally for violation burden, rank 6,906 of 12,903.
Against the CA average
Among the 803 CA systems in this dataset, the average is 5.8 health-based violations - ALAMEDA COUNTY WATER DISTRICT's 2 is at or below that. See the lead and copper guide for why lead counts differently.
Most recent violation on record
ALAMEDA COUNTY WATER DISTRICT's most recent violation on record is dated 1996-01-04, with the most recent health-based one dated 1996-01-04. Last reported to EPA: 06/22/2026.
The concern categories on record
ALAMEDA COUNTY WATER DISTRICT's flagged contaminants and rule violations, grouped by what they actually mean for a filter choice rather than left as EPA's raw code list:
- Microbial contamination / treatment technique - flagged from: Coliform (TCR); Surface Water Treatment Rule
The most severe category on record is microbial contamination / treatment technique, which points toward a microbial-class filter if you want to address it directly.
What ALAMEDA COUNTY WATER DISTRICT's record does not cover
Everything on this page is ALAMEDA COUNTY WATER DISTRICT's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 4 logged violations can see. The guide to what this data misses covers that gap.