Search by provider name, city, service area, or state.
State utility hub
Browse the indexed community water systems in this state. Each profile brings the provider’s payment routes and household protection policies into a single, practical guide.
Municipal Department
Service area: Billings and approved areas outside the city limits
Population: Billings is Montana’s largest city and its metropolitan trade area exceeds 185,000 residents; the municipal utility reports more than 32,000 water meters and serves residential and commercial customers inside the city and approved outside-city areas.
Municipal Department
Service area: Billings
Population: 114,000
Municipal Department
Service area: City of Great Falls
Population: 60,000 people (EPA SDWA queue estimate for MT0000525)
Municipal Department
Service area: City of Bozeman
Population: 56,000 people (EPA SDWA queue estimate for MT0000161)
Municipal Department
Service area: Butte-Silver Bow
Population: 33,000 people (EPA SDWA queue estimate for MT0000170)
Municipal Department
Service area: Helena
Population: 32,091 people (EPA SDWA queue estimate for MT0000241)
Municipal Department
Service area: Kalispell
Population: 25,000 people (EPA SDWIS 2026Q2 estimate for MT0000259)
Municipal Department
Service area: Billings
Population: Approximately 114,000 people served by the City of Billings municipal water and wastewater system.
Municipal Department
Service area: MISSOULA
Population: 68200 people (EPA SDWIS 2026Q2 active CWS estimate for MT0000294)
Montana directory notes
This state hub brings together 9 indexed community water systems, from city departments and public authorities to investor-owned systems and smaller regional providers. A service area may cross municipal boundaries, so use the provider name and service address on your bill when choosing a profile.
The most important distinction is between a directory listing and an official account channel. Water Ledger provides a structured starting point; the utility’s own payment portal, published rate schedule, customer-service office, and mailed notice control your account. Compare the payment route, billing frequency, emergency number, and customer-protection notes before relying on a page for a time-sensitive decision.
If you are helping a household with a high bill, leak, or delinquency notice, open the utility profile and review the payment, shut-off, and leak-adjustment guides together. Keep the bill, account number, confirmation receipts, repair records, and notice dates available when speaking with the provider.