Water Resources Division
Published drinking-water records and contacts for Water Resources Division. System MT0003623. Review sources and dates; not a real-time water assessment.
- System ID
- MT0003623
- State or territory
- MT
- Published population served
- 60
- System type (source code)
- NTNCWS
Published records and dates
- Lead and copper monitoring summaries: 12 — 1993-07-01 – 2025-12-31
- Montana selected chemical sample panels: 12 — 2026-02-09 – 2026-02-09
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
Lead and copper: 90th-percentile summaries
These describe a monitoring period across sampled locations, not the result at your home. How to read the 90th percentile
| Substance | Published 90th percentile | Monitoring period | Source quarter |
|---|---|---|---|
| Lead (PB90) | 0.002 mg/L | 2023-01-01 – 2025-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2017-01-01 – 2019-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2014-01-01 – 2016-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2011-01-01 – 2013-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2005-01-01 – 2007-12-31 | 2026Q3 |
| Lead (PB90) | 0.005 mg/L | 1999-01-01 – 2001-12-31 | 2026Q3 |
| Lead (PB90) | 0.006 mg/L | 1999-01-01 – 1999-12-31 | 2026Q3 |
| Lead (PB90) | 0.002 mg/L | 1996-01-01 – 1996-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| ARSENIC | 0.002 mg/L | 2026-02-09 | EP502 / Montana selected chemical sample panels |
| BARIUM | 0.21 mg/L | 2026-02-09 | EP502 / Montana selected chemical sample panels |
| CADMIUM | < .001 mg/L | 2026-02-09 | EP502 / Montana selected chemical sample panels |
| CHROMIUM | < .005 mg/L | 2026-02-09 | EP502 / Montana selected chemical sample panels |
| MANGANESE | < .001 mg/L | 2026-02-09 | EP502 / Montana selected chemical sample panels |
| MERCURY | < .0001 mg/L | 2026-02-09 | EP502 / Montana selected chemical sample panels |
| NICKEL | < .005 mg/L | 2026-02-09 | EP502 / Montana selected chemical sample panels |
| SELENIUM | < .001 mg/L | 2026-02-09 | EP502 / Montana selected chemical sample panels |
| ANTIMONY, TOTAL | < .001 mg/L | 2026-02-09 | EP502 / Montana selected chemical sample panels |
| BERYLLIUM, TOTAL | < .001 mg/L | 2026-02-09 | EP502 / Montana selected chemical sample panels |
| THALLIUM, TOTAL | < .0005 mg/L | 2026-02-09 | EP502 / Montana selected chemical sample panels |
| NITRATE-NITRITE | 0.64 mg/L | 2026-02-09 | 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
67 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 |
|---|---|---|---|---|
| Ground Water Rule / Monitoring, Source Water (GWR) | 2025-09-18 – — | Unaddressed | No | 2026Q3 |
| Nitrate Rule / Monitoring, Regular | 2025-01-01 – 2025-12-31 | Resolved | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2024-11-01 – 2024-11-30 | Resolved | No | 2026Q3 |
| Nitrate Rule / Monitoring, Regular | 2024-01-01 – 2024-12-31 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2023-01-01 – 2025-12-31 | Archived | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2023-01-01 – 2025-12-31 | Archived | No | 2026Q3 |
| Inorganic Chemicals / Monitoring, Regular | 2023-01-01 – 2025-12-31 | Resolved | No | 2026Q3 |
| Inorganic Chemicals / Monitoring, Regular | 2023-01-01 – 2025-12-31 | Resolved | No | 2026Q3 |
| Inorganic Chemicals / Monitoring, Regular | 2023-01-01 – 2025-12-31 | Resolved | No | 2026Q3 |
| Inorganic Chemicals / Monitoring, Regular | 2023-01-01 – 2025-12-31 | Resolved | No | 2026Q3 |
| Inorganic Chemicals / Monitoring, Regular | 2023-01-01 – 2025-12-31 | Resolved | No | 2026Q3 |
| Inorganic Chemicals / Monitoring, Regular | 2023-01-01 – 2025-12-31 | Resolved | No | 2026Q3 |
| Inorganic Chemicals / Monitoring, Regular | 2023-01-01 – 2025-12-31 | Resolved | No | 2026Q3 |
| Inorganic Chemicals / Monitoring, Regular | 2023-01-01 – 2025-12-31 | Resolved | No | 2026Q3 |
| Inorganic Chemicals / Monitoring, Regular | 2023-01-01 – 2025-12-31 | Resolved | No | 2026Q3 |
| Inorganic Chemicals / Monitoring, Regular | 2023-01-01 – 2025-12-31 | Resolved | No | 2026Q3 |
| Synthetic Organic Chemicals / Monitoring, Regular | 2023-01-01 – 2025-12-31 | Archived | No | 2026Q3 |
| Synthetic Organic Chemicals / Monitoring, Regular | 2023-01-01 – 2025-12-31 | Archived | No | 2026Q3 |
| Synthetic Organic Chemicals / Monitoring, Regular | 2023-01-01 – 2025-12-31 | Archived | No | 2026Q3 |
| Synthetic Organic Chemicals / Monitoring, Regular | 2023-01-01 – 2025-12-31 | Archived | 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)
Gragg, Kenneth J: 406-542-4320
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.