YNP-MAMMOTH HOT SPRINGS: EPA violation history, explained
YNP-MAMMOTH HOT SPRINGS has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 2,600 people get their water from it, across 274 connections.
How this compares nationally
Out of 12,903 systems in this dataset, YNP-MAMMOTH HOT SPRINGS ranks 8,331th by violation burden (35th percentile) - 9 violations total, 1 health-based.
How YNP-MAMMOTH HOT SPRINGS compares within WY
YNP-MAMMOTH HOT SPRINGS's 1 health-based violations sit within the WY average of 5.0, across 44 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 YNP-MAMMOTH HOT SPRINGS is from 2023-01-08 (health-based: 2005-01-07). Last reported to EPA: 06/29/2026.
What kind of problem, specifically
YNP-MAMMOTH HOT SPRINGS'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: 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 this data is and is not
Everything on this page is YNP-MAMMOTH HOT SPRINGS's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 9 logged violations can see. The guide to what this data misses covers that gap.