Yellowtail Dam Powerplant And Visitor Ce
Published drinking-water records and contacts for Yellowtail Dam Powerplant And Visitor Ce. System MT0000103. Review sources and dates; not a real-time water assessment.
- System ID
- MT0000103
- State or territory
- MT
- Published population served
- 48
- System type (source code)
- TNCWS
Published records and dates
- Montana selected chemical sample panels: 1 — 2026-02-11 – 2026-02-11
Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.
Published testing results
Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.
“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| NITRATE-NITRITE | 0.50 mg/L | 2026-02-11 | EP502 / Montana selected chemical sample panels |
State sampling points can include untreated water. Publisher qualifiers and units are retained; consult the full source notes before interpreting a record.
Download state records with source notes (CSV)
Published compliance history
9 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.
| Rule / record | Period | Recorded status | Health-based (EPA classification) | Source quarter |
|---|---|---|---|---|
| Interim and Long Term 1 Enhanced Surface Water Treatment Rule / Monitoring, Turbidity (Enhanced SWTR) | 2022-06-01 – 2022-06-30 | Resolved | No | 2026Q3 |
| Interim and Long Term 1 Enhanced Surface Water Treatment Rule / Monitoring, Turbidity (Enhanced SWTR) | 2022-05-01 – 2022-05-31 | Resolved | No | 2026Q3 |
| Interim and Long Term 1 Enhanced Surface Water Treatment Rule / Monitoring, Turbidity (Enhanced SWTR) | 2022-04-01 – 2022-04-30 | Resolved | No | 2026Q3 |
| Interim and Long Term 1 Enhanced Surface Water Treatment Rule / Monitoring, Turbidity (Enhanced SWTR) | 2022-03-01 – 2022-03-31 | Resolved | No | 2026Q3 |
| Interim and Long Term 1 Enhanced Surface Water Treatment Rule / Monthly Turbidity Exceed (Enhanced SWTR) | 2019-02-01 – 2019-02-28 | Resolved | Yes | 2026Q3 |
| Interim and Long Term 1 Enhanced Surface Water Treatment Rule / Monthly Turbidity Exceed (Enhanced SWTR) | 2019-01-01 – 2019-01-31 | Resolved | Yes | 2026Q3 |
| Interim and Long Term 1 Enhanced Surface Water Treatment Rule / Single Turbidity Exceed (Enhanced SWTR) | 2018-12-01 – 2018-12-31 | Resolved | Yes | 2026Q3 |
| Interim and Long Term 1 Enhanced Surface Water Treatment Rule / Monthly Turbidity Exceed (Enhanced SWTR) | 2018-12-01 – 2018-12-31 | Resolved | Yes | 2026Q3 |
| Nitrate Rule / Monitoring, Regular | 2017-01-01 – 2017-12-31 | Resolved | No | 2026Q3 |
Source dates and refresh checks
A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.
- EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
- EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
- EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17
- Montana selected chemical sample panels — last successful check: 2026-09-30; latest refresh needs attention; previous records retained
Administrative contact (EPA filing)
Byrnes, Michael: 406-666-3201
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.