Transient Non-Community · PWSID WY5680090

Ynp-Tower Junction Ranger Station

Serves 940 peopleGroundwater Under InfluenceOwner: FederalYellowstone National Park, Wyoming
1 open treatment violation.

Open for: Surface water treatment (SWTR). EPA counts treatment-technique violations as health-based: a required protective step was not done. It is not a measurement of contamination.

On record since 2025: 1 violation. 1 treatment lapse. Most recent began 2025-01-31.

For this year's test results, ask the utility for its annual Consumer Confidence Report. Every community system must publish one.

0Over the limit
1Treatment lapse1 open
0Missed or late test
0Notice or report

More violations on record than 17% of active water systems in Wyoming. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

20052010201520202025 · Treatment lapse: 12025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
100% treatment lapse · 1

Across Wyoming, 85% of violations are missed or late tests and 4% are water over a limit.

Open now (1)

  1. 2025-01-31Surface water treatment (SWTR)Failure to Filter (SWTR)Open

Every violation on record

  1. 2025-01-31Surface water treatment (SWTR)Failure to Filter (SWTR)Open

System details

Population served940
Service connections15
Water sourceGroundwater Under Influence
System typeTransient Non-Community
OwnerFederal
StatusActive
CityYellowstone National Park
EPA ZIP on file82190

Areas served

  • Yellowstone Np, Teton County

Reading this record

Ynp-Tower Junction Ranger Station is a transient non-community that draws from groundwater under influence and serves about 940 people in Yellowstone National Park, Wyoming. Everything above comes from the EPA's Safe Drinking Water Information System (SDWIS), where states report every violation by every public water system.

Four kinds of violation. Only one is a measurement of the water: over the limit means a test came back above a legal maximum (an MCL). A treatment lapse means a required protective step was not done, such as disinfection, filtration, fixing a defect an inspector found, or filing a lead-pipe inventory. A missed or late test means a required test was skipped or never reported. That is the most common kind, and the most misread: it does not mean the water was bad, and it does not mean the water was fine. Notices and reports covers public notices and the annual Consumer Confidence Report.

Status. “Back in compliance” means the state recorded a return to compliance. “Period ended” means the violation's compliance period is over but no return to compliance was ever filed, which is common in older records. EPA's federal copy lags state records by months, so call the utility for anything current.