Is CITY OF CUPERTINO's water safe to drink?
CITY OF CUPERTINO has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 16,336 people through 4,692 service connections.
CITY OF CUPERTINO's record against the rest of the country
CITY OF CUPERTINO has 3 violations on record in total, 3 of thems health-based - ranking it 5,614th of 12,903 systems by violation count, the 56th percentile nationally.
Against the CA average
Among the 803 CA systems in this dataset, the average is 5.8 health-based violations - CITY OF CUPERTINO's 3 is at or below that. See the lead and copper guide for why lead counts differently.
Most recent violation on record
CITY OF CUPERTINO's most recent violation on record is dated 1994-10-02, with the most recent health-based one dated 1994-10-02. Last reported to EPA: 06/22/2026.
The concern categories on record
CITY OF CUPERTINO'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:
- Disinfection byproducts - flagged from: TTHM
The most severe category on record is disinfection byproducts, which points toward a carbon-class filter if you want to address it directly.
What CITY OF CUPERTINO's record does not cover
CITY OF CUPERTINO'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 CUPERTINO's customers' taps is household plumbing, invisible to a system-level record ranked 5,614th of 12,903 by violation count. The guide to what this data misses covers that gap.