Is CITY OF MOUNTAIN HOUSE's water safe to drink?
CITY OF MOUNTAIN HOUSE has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 24,948, over 7,559 connections.
Ranked against every other system in this dataset
CITY OF MOUNTAIN HOUSE has 2 violations on record in total, 1 of them health-based - ranking it 9,097th of 12,903 systems by violation count, the 29th percentile nationally.
How CITY OF MOUNTAIN HOUSE compares within CA
Among the 803 CA systems in this dataset, the average is 5.8 health-based violations - CITY OF MOUNTAIN HOUSE's 1 is at or below that. 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 CITY OF MOUNTAIN HOUSE is from 2010-01-02 (health-based: 2005-01-01). Last reported to EPA: 06/22/2026.
What kind of problem, specifically
CITY OF MOUNTAIN HOUSE'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 this data is and is not
Everything on this page is CITY OF MOUNTAIN HOUSE's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. Between the utility's meter and CITY OF MOUNTAIN HOUSE's customers' taps is household plumbing, invisible to a system-level record ranked 9,097th of 12,903 by violation count. The guide to what this data misses covers that gap.