Water Quality in MISSOULA, MT (59808)

EPA violation data for public water systems serving ZIP code 59808.

Total Violations

Health-Based

Monitoring / Reporting

Resolved

What does this mean?

77 of 89 violations have been resolved. 23 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 66 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: 56 Population served: 13,185

Violations Detail (89 total)

Contaminant	Category	MCL Limit	Measured	Date	Status	Health Effects
Revised Total Coliform Rule	Health-Based	N/A	N/A	Dec 1, 2025	Active	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Dec 1, 2025	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2025	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2025	Active	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Sep 15, 2025	Active	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Sep 15, 2025	Active	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
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
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
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 29, 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
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
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
Nitrate-Nitrite	Monitoring	N/A	N/A	Dec 31, 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
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
Revised Total Coliform Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 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
Nitrate-Nitrite	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
E. COLI	Monitoring	0	N/A	Nov 3, 2022	Active	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Nov 3, 2022	Active	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Nov 3, 2022	Active	Severe gastrointestinal illness; may be fatal in vulnerable populations
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
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
Revised Total Coliform Rule	Health-Based	N/A	N/A	Sep 26, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Sep 26, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Sep 26, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Mar 11, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Mar 11, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Mar 11, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Jan 28, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Jan 28, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Jan 28, 2022	Resolved	N/A
Bromate	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Increased risk of cancer
Bromate	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Increased risk of cancer
Bromate	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Increased risk of cancer
Groundwater Rule	Health-Based	N/A	N/A	Jun 11, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jun 11, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jun 11, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jun 11, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jun 11, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jun 1, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jun 1, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jun 1, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jun 1, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jun 1, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Nitrate-Nitrite	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
E. COLI	Monitoring	0	N/A	Mar 1, 2021	Active	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Mar 1, 2021	Active	Severe gastrointestinal illness; may be fatal in vulnerable populations

Lead & Copper Levels

Violation Timeline

2025(16)

Revised Total Coliform Rule

Dec 1Active

Revised Total Coliform Rule

Dec 1Active

Lead and Copper Rule

Sep 30Active

Lead and Copper Rule

Sep 30Active

Revised Total Coliform Rule

Sep 15Active

Revised Total Coliform Rule

Sep 15Active

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

Nitrate-Nitrite

Mar 31Resolved

2024(5)

Lead and Copper Rule

Dec 29Active

Lead and Copper Rule

Dec 29Resolved

Lead and Copper Rule

Dec 29Resolved

Lead and Copper Rule

Dec 29Resolved

Lead and Copper Rule

Dec 29Resolved

How Does This Compare?

MISSOULA (59808) has 89 recorded violations, including 23 health-based. 12 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 →

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 MISSOULA, MT (59808)

What does this mean?

Violations Detail (89 total)

Lead & Copper Levels

Violation Timeline

2025(16)

2024(5)

2023(18)

2022(25)

2021(25)

How Does This Compare?

Recommended Water Filters

Reverse Osmosis System

UV Water Purifier

Nearby ZIP Codes

Check Another ZIP Code