What's in CWSC LOS ALTOS SUBURBAN's water?
CWSC LOS ALTOS SUBURBAN has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 69,973, over 18,530 connections.
How this compares nationally
CWSC LOS ALTOS SUBURBAN has 4 violations on record in total, 1 of them health-based - ranking it 8,800th of 12,903 systems by violation count, the 32th percentile nationally.
How CWSC LOS ALTOS SUBURBAN compares within CA
CWSC LOS ALTOS SUBURBAN's 1 health-based violations sit within the CA average of 5.8, across 803 systems statewide. The filter guide explains what a violation like this actually calls for.
Most recent violation on record
The last violation EPA has on record for CWSC LOS ALTOS SUBURBAN is from 2002-01-01 (health-based: 1992-01-11). Last reported to EPA: 06/22/2026.
What kind of problem, specifically
CWSC LOS ALTOS SUBURBAN'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)
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 this data is and is not
Everything on this page is CWSC LOS ALTOS SUBURBAN's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. This record - 1 health-based violation on file for CWSC LOS ALTOS SUBURBAN - stops at the meter and cannot see household plumbing on the other side of it. The guide to what this data misses covers that gap.