Transient Non-Community · PWSID WY5680082

Ynp - Madison Junction Water System

Serves 1,205 peopleGroundwater Under InfluenceOwner: FederalYellowstone, Wyoming
Nothing open right now.

On record since 2022: 7 violations. 2 treatment lapses · 5 missed or late tests. Most recent began 2024-10-01.

None of them is a measurement of contaminated water.

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

0Over the limit
2Treatment lapse
5Missed or late test
0Notice or report

More violations on record than 70% 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

20052010201520202022 · Treatment lapse: 12023 · Missed or late test: 22023 · Missed or late test: 22024 · Treatment lapse: 12024 · Missed or late test: 32024 · Missed or late test: 32024 · Missed or late test: 32025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
29% treatment lapse · 271% missed or late test · 5

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

Every violation on record

  1. 2024-10-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  2. 2024-10-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  3. 2024-06-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  4. 2024-05-01Revised Total Coliform RuleTTBack in compliance
  5. 2023-10-01Revised Total Coliform RuleMONBack in compliance
  6. 2023-10-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  7. 2022-01-10Surface water treatment (SWTR)Failure to Filter (SWTR)Back in compliance

System details

Population served1,205
Service connections122
Water sourceGroundwater Under Influence
System typeTransient Non-Community
OwnerFederal
StatusActive
CityYellowstone
EPA ZIP on file82190

Areas served

  • Yellowstone Nt, Teton County

Reading this record

Ynp - Madison Junction Water System is a transient non-community that draws from groundwater under influence and serves about 1,205 people in Yellowstone, 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.