Is CITY OF SUNNYVALE's water safe to drink?
CITY OF SUNNYVALE has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 157,566 people get their water from it, across 28,372 connections.
Ranked against every other system in this dataset
Out of 12,903 systems in this dataset, CITY OF SUNNYVALE ranks 4,755th by violation burden (63th percentile) - 69 violations total, 3 health-baseds.
Against the CA average
CITY OF SUNNYVALE's 3 health-based violations sit within the CA average of 5.8, across 803 systems statewide. See the lead and copper guide for why lead counts differently.
Most recent violation on record
CITY OF SUNNYVALE's most recent violation on record is dated 2015-01-03, with the most recent health-based one dated 2015-01-03. Last reported to EPA: 06/22/2026.
The concern categories on record
CITY OF SUNNYVALE'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: 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 CITY OF SUNNYVALE's record does not cover
CITY OF SUNNYVALE's numbers here come from its own required reporting to EPA under the Safe Drinking Water Act, not from an independent test of your glass of water. Between the utility's meter and CITY OF SUNNYVALE's customers' taps is household plumbing, invisible to a system-level record ranked 4,755th of 12,903 by violation count. The guide to what this data misses covers that gap.