DrinkingWaterCheck

What's in MODESTO, CITY OF's water?

MODESTO, CITY OF has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 218,771, over 70,793 connections.

How this compares nationally

15 total violations and 12 health-based ones put MODESTO, CITY OF at the 87th percentile nationally for violation burden, rank 1,648 of 12,903.

Against the CA average

CA's 803 covered systems average 5.8 health-based violations each; MODESTO, CITY OF carries 12, more than typical for the state. See the lead and copper guide for why lead counts differently.

Most recent violation on record

MODESTO, CITY OF's most recent violation on record is dated 2013-01-08, with the most recent health-based one dated 2013-01-08. Last reported to EPA: 06/22/2026.

The concern categories on record

MODESTO, CITY OF'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:

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 MODESTO, CITY OF's record does not cover

This is what MODESTO, CITY OF reported to its state primacy agency and EPA under the Safe Drinking Water Act - real regulatory record, not a lab test of your specific tap. Between the utility's meter and MODESTO, CITY OF's customers' taps is household plumbing, invisible to a system-level record ranked 1,648th of 12,903 by violation count. The guide to what this data misses covers that gap.