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PUBLIC WATER SYSTEM REPORT
Is YNP-MAMMOTH HOT SPRINGS Water Safe to Drink in 2026?
Wyoming · PWSID WY5680092 · Surface water
Population served
2,600
Cities served
YELLOWSTONE NP
State / jurisdiction
Wyoming (WY)
PWSID
WY5680092
B-
TAP WATER GRADE
Fair
Model score 70/88 from violations, PFAS profile, and monitoring signals — not a laboratory test of your faucet.
14 violation record(s) in the latest EPA SDWA quarterly snapshot
CONTAMINANTS — EPA UCMR5 MONITORING
No UCMR5 PFAS detects on file for this PWS in our bundled national dataset — the system may be smaller than UCMR5 thresholds, had non-detects, or results are not yet linked to this ID. Your retailer Annual Water Quality Report lists other regulated contaminants (chlorine, DBPs, nitrates, etc.).
Official Consumer Confidence Report (CCR)
📋 The official 2026 CCR for YNP-MAMMOTH HOT SPRINGS has not yet been published on WaterCheckup.
Are you the water operator for YNP-MAMMOTH HOT SPRINGS? Publish your official CCR here for free — your customers are already finding this page.
Residents: Your public water system is required by EPA to publish an annual CCR by July 1st each year. Contact YNP-MAMMOTH HOT SPRINGSdirectly to request a copy, or check the EPA's national CCR portal at cfpub.epa.gov/ccr.
VIOLATIONS HISTORY (FEDERAL SNAPSHOT)
EPA’s national SDWA quarterly files associate 14 violation-related records with this system in the same reporting quarter as the public water system snapshot used on WaterCheckup. This is not a complete historical docket — see ECHO and SDWIS for full compliance context.
WHY THIS FOR YNP-MAMMOTH HOT SPRINGS · Chosen for YNP-MAMMOTH HOT SPRINGS because the latest federal SDWA snapshot lists substantial violation activity. Certified reverse osmosis provides the broadest residential barrier for households that want margin beyond legal compliance.
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