What's in NPS GGNRA's water?
NPS GGNRA has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 18,447, over 224 connections.
NPS GGNRA's record against the rest of the country
NPS GGNRA has 10 violations on record in total, 4 of thems health-based - ranking it 4,396th of 12,903 systems by violation count, the 66th percentile nationally.
Against the CA average
NPS GGNRA's 4 health-based violations sit within the CA average of 5.8, across 803 systems statewide. The clean-record guide covers what a comparison like this can hide.
Most recent violation on record
NPS GGNRA's most recent violation on record is dated 2015-01-10, with the most recent health-based one dated 2015-01-10. Last reported to EPA: 06/22/2026.
The concern categories on record
NPS GGNRA'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); 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 NPS GGNRA's record does not cover
NPS GGNRA'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. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 10 logged violations can see. The guide to what this data misses covers that gap.