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Montana Water Quality
145
Utilities in database
0.7M
Residents served
48%
On private wells
2
Key contaminants tracked
Drinking Water in Montana
Montana has 145 community water systems serving approximately 0.7 million residents. Primary water sources include groundwater. The most commonly reported contaminants include disinfection byproducts, nitrates. 48% of Montana residents rely on private wells. MDEQ holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Montana
101–125 of 145Meadowlark of Billings Llc
MT0000464 · 800 served
Town of Pinesdale
MT0002926 · 800 served
Jefferson Hills Wua
MT0002978 · 780 served
Golden Meadows Subdivision
MT0005141 · 772 served
Somers Co Water and Sewer Dist
MT0000332 · 765 served
Ten Mile and Pleasant Valley Wua
MT0002005 · 750 served
Fisher Water Service
MT0001848 · 750 served
Tiber County Water District
MT0000400 · 750 served
Town of Bridger
MT0000165 · 750 served
Landmark Subdivision
MT0004262 · 750 served
Montana State Hospital Complex
MT0004805 · 721 served
Town of Fairfield
MT0000212 · 718 served
North Star Pud
MT0004264 · 715 served
Town of Culbertson
MT0000192 · 714 served
Travois Village Mobile Park
MT0003909 · 702 served
Town of St Ignatius
MT0001740 · 700 served
Gardiner Park Co Water Dist
MT0000224 · 700 served
Woods Bay Water and Sewer District
MT0004698 · 685 served
Elk Grove Water
MT0004248 · 672 served
Genesis Business Park
MT0004178 · 670 served
Fort Peck Rural County Water District
MT0004177 · 663 served
Town of Cascade
MT0000171 · 650 served
St Labre Indian School
MT0000018 · 650 served
Hillside Village
MT0003808 · 650 served
Town of Circle
MT0000176 · 644 served
Key Contaminant Concerns in Montana
Nitrates
Nitrate (NO₃⁻) is a nitrogen-containing compound that forms naturally through the decomposition of organic matter. At elevated concentrations — almost always from human activity — nitrate interferes with the blood's ability to carry oxygen. The United States produces over 23 million tons of nitrogen fertilizer annually, making agricultural runoff the dominant source of nitrate contamination.
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
Montana Water FAQs
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Data source: Utility data from EPA SDWIS. 145 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-23