Water Quality in HELENA, MT (59624)

EPA violation data for public water systems serving ZIP code 59624.

299

Total Violations

Health-Based

248

Monitoring / Reporting

295

Resolved

What does this mean?

295 of 299 violations have been resolved. 51 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 248 are monitoring or reporting violations (missed testing deadlines or late paperwork — not necessarily a water quality issue). Not all violations mean your water is unsafe. The EPA requires reporting even for minor administrative issues.

Water systems: 12 Population served: 1,463

Violations Detail (299 total)

Contaminant	Category	MCL Limit	Measured	Date	Status	Health Effects
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2025	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
TTHM	Monitoring	N/A	N/A	Dec 31, 2024	Active	N/A
TTHM	Monitoring	N/A	N/A	Dec 31, 2024	Active	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2024	Active	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2024	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 29, 2024	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 29, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Nov 30, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Nov 30, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Nov 30, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Nov 30, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Nov 30, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Oct 31, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Oct 31, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Oct 31, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Oct 31, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Oct 31, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Oct 31, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Oct 31, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Sep 30, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Sep 30, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Sep 30, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Sep 30, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Sep 30, 2024	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Sep 30, 2024	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Sep 30, 2024	Resolved	N/A
Surface Water Treatment Rule	Monitoring	N/A	N/A	Sep 30, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 31, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 31, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 31, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 31, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 31, 2024	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	61	Jun 30, 2024	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	61	Jun 30, 2024	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	61	Jun 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	May 31, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	May 31, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	May 31, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	May 31, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	May 31, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Apr 30, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Apr 30, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Apr 30, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Apr 30, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Apr 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 29, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 29, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Feb 29, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Feb 29, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Feb 29, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Feb 29, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Feb 29, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 29, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jan 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jan 31, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jan 31, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jan 31, 2024	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jan 31, 2024	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.062	Dec 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.062	Dec 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.062	Dec 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.062	Dec 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.062	Dec 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.062	Dec 31, 2023	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
TTHM	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
TTHM	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
TTHM	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Nov 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Nov 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Nov 30, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Oct 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Oct 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Oct 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Oct 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Oct 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.069	Sep 30, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.069	Sep 30, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.069	Sep 30, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.069	Sep 30, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.069	Sep 30, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
E. COLI	Monitoring	0	N/A	Sep 26, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Sep 26, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Sep 26, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Groundwater Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jul 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jul 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jul 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jul 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jul 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.07	Jun 30, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.07	Jun 30, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.07	Jun 30, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.07	Jun 30, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.07	Jun 30, 2023	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.061	Mar 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.061	Mar 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.061	Mar 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.061	Mar 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.061	Mar 31, 2023	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jan 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jan 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jan 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jan 31, 2023	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jan 31, 2023	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2022	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2022	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2022	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2022	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2022	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2022	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2022	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2022	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Nov 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Aug 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Aug 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Aug 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Aug 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Aug 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Aug 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jul 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jul 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jul 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jul 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jul 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jul 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	70	Mar 31, 2021	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	70	Mar 31, 2021	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	70	Mar 31, 2021	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	70	Mar 31, 2021	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	70	Mar 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 28, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 28, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 28, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Feb 28, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Feb 28, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Feb 28, 2021	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Feb 28, 2021	Resolved	N/A

Lead & Copper Levels

Violation Timeline

2025(9)

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Lead and Copper Rule

Mar 31Resolved

Lead and Copper Rule

Mar 31Resolved

Lead and Copper Rule

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

2024(77)

TTHM

Dec 31Active

TTHM

Dec 31Active

Total Haloacetic Acids (HAA5)

Dec 31Active

Total Haloacetic Acids (HAA5)

Dec 31Active

Lead and Copper Rule

Dec 29Resolved

Lead and Copper Rule

Dec 29Resolved

Groundwater Rule

Nov 30Resolved

Groundwater Rule

Nov 30Resolved

Groundwater Rule

Nov 30Resolved

Groundwater Rule

Nov 30Resolved

Groundwater Rule

Nov 30Resolved

Groundwater Rule

Oct 31Resolved

Groundwater Rule

Oct 31Resolved

Groundwater Rule

Oct 31Resolved

Groundwater Rule

Oct 31Resolved

Groundwater Rule

Oct 31Resolved

Groundwater Rule

Oct 31Resolved

Groundwater Rule

Oct 31Resolved

Groundwater Rule

Sep 30Resolved

Groundwater Rule

Sep 30Resolved

Groundwater Rule

Sep 30Resolved

Groundwater Rule

Sep 30Resolved

Groundwater Rule

Sep 30Resolved

Surface Water Treatment Rule

Sep 30Resolved

Surface Water Treatment Rule

Sep 30Resolved

Surface Water Treatment Rule

Sep 30Resolved

Groundwater Rule

Aug 31Resolved

Groundwater Rule

Aug 31Resolved

Groundwater Rule

Aug 31Resolved

Groundwater Rule

Aug 31Resolved

Groundwater Rule

Aug 31Resolved

Total Haloacetic Acids (HAA5)

Jun 30Resolved

Total Haloacetic Acids (HAA5)

Jun 30Resolved

Total Haloacetic Acids (HAA5)

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

May 31Resolved

Revised Total Coliform Rule

May 31Resolved

Revised Total Coliform Rule

May 31Resolved

Groundwater Rule

May 31Resolved

Groundwater Rule

May 31Resolved

Groundwater Rule

May 31Resolved

Groundwater Rule

May 31Resolved

Groundwater Rule

May 31Resolved

Groundwater Rule

Apr 30Resolved

Groundwater Rule

Apr 30Resolved

Groundwater Rule

Apr 30Resolved

Groundwater Rule

Apr 30Resolved

Groundwater Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Revised Total Coliform Rule

Feb 29Resolved

Revised Total Coliform Rule

Feb 29Resolved

Groundwater Rule

Feb 29Resolved

Groundwater Rule

Feb 29Resolved

Groundwater Rule

Feb 29Resolved

Groundwater Rule

Feb 29Resolved

Groundwater Rule

Feb 29Resolved

Revised Total Coliform Rule

Feb 29Resolved

Groundwater Rule

Jan 31Resolved

Revised Total Coliform Rule

Jan 31Resolved

Revised Total Coliform Rule

Jan 31Resolved

Revised Total Coliform Rule

Jan 31Resolved

Groundwater Rule

Jan 31Resolved

Groundwater Rule

Jan 31Resolved

Groundwater Rule

Jan 31Resolved

Groundwater Rule

Jan 31Resolved

2023(95)

Lead and Copper Rule

Dec 31Resolved

Lead and Copper Rule

Dec 31Resolved

Lead and Copper Rule

Dec 31Resolved

Total Haloacetic Acids (HAA5)

Dec 31Resolved

Total Haloacetic Acids (HAA5)

Dec 31Resolved

Total Haloacetic Acids (HAA5)

Dec 31Resolved

Total Haloacetic Acids (HAA5)

Dec 31Resolved

Total Haloacetic Acids (HAA5)

Dec 31Resolved

Total Haloacetic Acids (HAA5)

Dec 31Resolved

Nitrate-Nitrite

Dec 31Resolved

Nitrate-Nitrite

Dec 31Resolved

Nitrate-Nitrite

Dec 31Resolved

Nitrate-Nitrite

Dec 31Resolved

Nitrate-Nitrite

Dec 31Resolved

Groundwater Rule

Dec 31Resolved

Groundwater Rule

Dec 31Resolved

Groundwater Rule

Dec 31Resolved

Groundwater Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Groundwater Rule

Dec 31Resolved

TTHM

Dec 31Resolved

TTHM

Dec 31Resolved

TTHM

Dec 31Resolved

Total Haloacetic Acids (HAA5)

Dec 31Resolved

Total Haloacetic Acids (HAA5)

Dec 31Resolved

Total Haloacetic Acids (HAA5)

Dec 31Resolved

Groundwater Rule

Nov 30Resolved

Groundwater Rule

Nov 30Resolved

Groundwater Rule

Nov 30Resolved

Revised Total Coliform Rule

Nov 30Resolved

Revised Total Coliform Rule

Nov 30Resolved

Revised Total Coliform Rule

Nov 30Resolved

Groundwater Rule

Nov 30Resolved

Groundwater Rule

Nov 30Resolved

Groundwater Rule

Oct 31Resolved

Groundwater Rule

Oct 31Resolved

Groundwater Rule

Oct 31Resolved

Groundwater Rule

Oct 31Resolved

Groundwater Rule

Oct 31Resolved

Total Haloacetic Acids (HAA5)

Sep 30Resolved

Total Haloacetic Acids (HAA5)

Sep 30Resolved

Total Haloacetic Acids (HAA5)

Sep 30Resolved

Total Haloacetic Acids (HAA5)

Sep 30Resolved

Total Haloacetic Acids (HAA5)

Sep 30Resolved

Lead and Copper Rule

Sep 30Resolved

Lead and Copper Rule

Sep 30Resolved

Lead and Copper Rule

Sep 30Resolved

Revised Total Coliform Rule

Sep 30Resolved

Revised Total Coliform Rule

Sep 30Resolved

Revised Total Coliform Rule

Sep 30Resolved

E. COLI

Sep 26Resolved

E. COLI

Sep 26Resolved

E. COLI

Sep 26Resolved

Groundwater Rule

Aug 31Resolved

Groundwater Rule

Aug 31Resolved

Groundwater Rule

Aug 31Resolved

Groundwater Rule

Aug 31Resolved

Groundwater Rule

Aug 31Resolved

Groundwater Rule

Jul 31Resolved

Groundwater Rule

Jul 31Resolved

Groundwater Rule

Jul 31Resolved

Groundwater Rule

Jul 31Resolved

Groundwater Rule

Jul 31Resolved

Total Haloacetic Acids (HAA5)

Jun 30Resolved

Total Haloacetic Acids (HAA5)

Jun 30Resolved

Total Haloacetic Acids (HAA5)

Jun 30Resolved

Total Haloacetic Acids (HAA5)

Jun 30Resolved

Total Haloacetic Acids (HAA5)

Jun 30Resolved

Nitrate-Nitrite

Jun 30Resolved

Nitrate-Nitrite

Jun 30Resolved

Groundwater Rule

Jun 30Resolved

Groundwater Rule

Jun 30Resolved

Groundwater Rule

Jun 30Resolved

Groundwater Rule

Jun 30Resolved

Groundwater Rule

Jun 30Resolved

Nitrate-Nitrite

Jun 30Resolved

Nitrate-Nitrite

Jun 30Resolved

Nitrate-Nitrite

Jun 30Resolved

Total Haloacetic Acids (HAA5)

Mar 31Resolved

Total Haloacetic Acids (HAA5)

Mar 31Resolved

Total Haloacetic Acids (HAA5)

Mar 31Resolved

Total Haloacetic Acids (HAA5)

Mar 31Resolved

Total Haloacetic Acids (HAA5)

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Groundwater Rule

Jan 31Resolved

Groundwater Rule

Jan 31Resolved

Groundwater Rule

Jan 31Resolved

Groundwater Rule

Jan 31Resolved

Groundwater Rule

Jan 31Resolved

2021(88)

Lead and Copper Rule

Dec 31Resolved

Lead and Copper Rule

Dec 31Resolved

Lead and Copper Rule

Dec 31Resolved

Total Haloacetic Acids (HAA5)

Dec 31Resolved

Total Haloacetic Acids (HAA5)

Dec 31Resolved

Total Haloacetic Acids (HAA5)

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Groundwater Rule

Dec 31Resolved

Groundwater Rule

Dec 31Resolved

Groundwater Rule

Dec 31Resolved

Groundwater Rule

Dec 31Resolved

Groundwater Rule

Dec 31Resolved

Groundwater Rule

Dec 31Resolved

Nitrate-Nitrite

Dec 31Resolved

Nitrate-Nitrite

Dec 31Resolved

Nitrate-Nitrite

Dec 31Resolved

Nitrate-Nitrite

Dec 31Resolved

Groundwater Rule

Nov 30Resolved

Groundwater Rule

Nov 30Resolved

Groundwater Rule

Nov 30Resolved

Groundwater Rule

Nov 30Resolved

Groundwater Rule

Nov 30Resolved

Groundwater Rule

Nov 30Resolved

Groundwater Rule

Sep 30Resolved

Groundwater Rule

Sep 30Resolved

Groundwater Rule

Sep 30Resolved

Groundwater Rule

Sep 30Resolved

Groundwater Rule

Sep 30Resolved

Groundwater Rule

Sep 30Resolved

Lead and Copper Rule

Sep 28Resolved

Lead and Copper Rule

Sep 28Resolved

Groundwater Rule

Aug 31Resolved

Groundwater Rule

Aug 31Resolved

Groundwater Rule

Aug 31Resolved

Groundwater Rule

Aug 31Resolved

Groundwater Rule

Aug 31Resolved

Groundwater Rule

Aug 31Resolved

Groundwater Rule

Jul 31Resolved

Groundwater Rule

Jul 31Resolved

Groundwater Rule

Jul 31Resolved

Groundwater Rule

Jul 31Resolved

Groundwater Rule

Jul 31Resolved

Groundwater Rule

Jul 31Resolved

Groundwater Rule

Jun 30Resolved

Groundwater Rule

Jun 30Resolved

Groundwater Rule

Jun 30Resolved

Groundwater Rule

Jun 30Resolved

Groundwater Rule

Jun 30Resolved

Groundwater Rule

Jun 30Resolved

Groundwater Rule

Jun 30Resolved

Groundwater Rule

Jun 30Resolved

Groundwater Rule

Jun 30Resolved

Groundwater Rule

May 31Resolved

Groundwater Rule

May 31Resolved

Groundwater Rule

May 31Resolved

Groundwater Rule

May 31Resolved

Groundwater Rule

May 31Resolved

Groundwater Rule

May 31Resolved

Groundwater Rule

May 31Resolved

Groundwater Rule

May 31Resolved

Groundwater Rule

May 31Resolved

Revised Total Coliform Rule

May 31Resolved

Revised Total Coliform Rule

May 31Resolved

Revised Total Coliform Rule

May 31Resolved

Groundwater Rule

Apr 30Resolved

Groundwater Rule

Apr 30Resolved

Groundwater Rule

Apr 30Resolved

Groundwater Rule

Apr 30Resolved

Total Haloacetic Acids (HAA5)

Mar 31Resolved

Total Haloacetic Acids (HAA5)

Mar 31Resolved

Total Haloacetic Acids (HAA5)

Mar 31Resolved

Total Haloacetic Acids (HAA5)

Mar 31Resolved

Total Haloacetic Acids (HAA5)

Mar 31Resolved

Groundwater Rule

Mar 31Resolved

Groundwater Rule

Mar 31Resolved

Groundwater Rule

Mar 31Resolved

Groundwater Rule

Mar 31Resolved

Revised Total Coliform Rule

Feb 28Resolved

Revised Total Coliform Rule

Feb 28Resolved

Revised Total Coliform Rule

Feb 28Resolved

Groundwater Rule

Feb 28Resolved

Groundwater Rule

Feb 28Resolved

Groundwater Rule

Feb 28Resolved

Groundwater Rule

Feb 28Resolved

How Does This Compare?

HELENA (59624) has 299 recorded violations, including 51 health-based. 4 remain unresolved. Consider testing your tap water independently for added peace of mind.

Recommended Water Filters

Based on the contaminants detected in your area, these filter types may help improve your water quality.

Reverse Osmosis System

Highly effective at removing heavy metals, dissolved solids, and a wide range of contaminants. Recommended for homes with lead or arsenic concerns.

Targets:Lead, Copper, Arsenic, Mercury, Cadmium

Look for:NSF/ANSI 58 certified

NSF Certified Products → EPA Safe Drinking Water Guide →

Activated Carbon Filter

Excellent for removing chlorine, chloramine, and disinfection byproducts like THMs and HAAs. Available as pitcher filters, countertop, or under-sink units.

Targets:THMs, HAAs, Chlorine, Chloramine, Taste & Odor

Look for:NSF/ANSI 42 & 53 certified

NSF Certified Products → EPA Safe Drinking Water Guide →

UV Water Purifier

Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.

Targets:E. coli, Coliform, Giardia, Cryptosporidium

Look for:NSF/ANSI 55 (Class A) certified

NSF Certified Products → EPA Safe Drinking Water Guide →

Always look for filters certified by NSF International for the specific contaminants you want to remove.

Water Quality in HELENA, MT (59624)

What does this mean?

Violations Detail (299 total)

Lead & Copper Levels

Violation Timeline

2025(9)

2024(77)

2023(95)

2022(30)

2021(88)

How Does This Compare?

Recommended Water Filters

Reverse Osmosis System

Activated Carbon Filter

UV Water Purifier

Nearby ZIP Codes

Check Another ZIP Code