Tapcensus

Montana

Yellowstone County drinking water quality

118 active public water systems serve 170,080 people in Yellowstone County. 44 are compliant, 74 had at least one EPA violation in the past three years, 2 are designated serious violators, and 1 carries a health flag.

Active systems 118 54 community systems
People served 170K by public water systems
Systems with violations 74 63% of active systems, past 3 years
Serious violators 2 1 systems carry a health flag

Needs attention

Worden Ballantine Yellowstone MT0000022 · Ballantine, Worden · Community water system · Serves 800 4 rules violated in the past three years. Unresolved: Surface Water Treatment Rule and Lead and Copper Rule.
Red Rooster Bar MT0001763 · Shepherd · Transient non-community system · Serves 40 1 rule violated in the past three years

Community water systems

54 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
Billings City of
Billings 		114,000 0 0
Billings Heights CO Water Dist of
Billings 		12,000 3 0
Laurel Municipal Water System
Laurel 		6,339 1 0
Lockwood Water and Sewer District
Billings 		5,900 0 0
Pioneer Water Service
Billings 		900 1 0
GO 2 U Water Delivery
Laurel 		875 1 0
Estates at Yellowstone LLC
Billings 		800 2 0
Worden Ballantine Yellowstone
Ballantine, Worden 		800 4 2
Golden Meadows Subdivision
Billings 		772 1 0
Fisher Water Service
Billings 		750 1 0
Hillside Village
Billings 		650 3 1
Cherry Creek Estates LLC
Billings 		600 2 1
Windsor Estates
Billings 		530 2 1
Pryor Creek Water Assn
Huntley 		475 1 0
Stone Creek Subdivision
Billings 		378 0 0
Sundance Subdivision
Billings 		378 0 0
Hidden Lake Yellowstone County W and S D
Billings 		350 1 0
Emerald View Park
Billings 		320 2 0
Shiloh Road Development
Billings 		315 1 0
Fox Water Service Incorporated
Laurel 		250 0 0
Granite Park Water Association
Billings 		250 2 0
Precision Water
Billings 		250 1 0
Golden Meadows Subdivision 2nd CC
Billings 		245 1 0
Wells Garden Estates
Billings 		240 2 0
Yellowstone Boys and Girls Ranch
Billings 		240 0 0
Skycrest Estates Subdivision
Billings 		235 1 0
Huntley Yellowstone CO Water and Sewer
Huntley 		230 0 0
Crystal Springs Water System
Billings 		225 2 0
The Nines Subdivision
Billings 		220 0 0
Broadview Town of
Broadview 		200 0 0
Oak Ridge Estates
Billings 		200 1 0
Still River Estates Subdivision
Billings 		188 3 0
Sunhaven Mobile Home Park
Laurel 		160 1 0
Saddleback Ridge Estates
Billings 		150 0 0
C & C Community INC
Billings 		145 2 1
Eastwood Mobile Home Court
Billings 		140 1 0
Golden Eagle Water Users Assn
Billings 		125 1 0
Mountain View Colony
Broadview 		114 1 0
Aldinger Acres Subdivision
Billings 		100 1 0
River Grove Estates TR CT
Billings 		100 1 1
Shepherd Water Station
Shepherd 		100 2 0
Water Drop LLC
Billings 		100 1 0
Peks Mobile Home Court
Billings 		95 3 0
Mitchell Court Apartments
Billings 		80 1 0
Arrow Creek Trailer Court
Billings 		75 3 0
Black Rock Estates Subdivision
Billings 		75 1 0
Midway Townhomes Wua
Billings 		75 1 0
Duck Creek Mobile Home Park
Billings 		70 5 0
Blue Grass Water Users Association
Billings 		60 2 0
Ridgeview Subdivision Phase One
Billings 		60 2 1
Non-community systems (64: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Rocky Mountain College
Billings 		5,700 0 0
Montana State University Billings
Billings 		2,999 0 0
Shepherd Schools
Shepherd 		800 3 1
Elder Grove Middle School Bldg 6
Billings 		600 2 1
Travel Centers of America Truck Plaza
Laurel 		600 0 0
Elder Grove School Buildings 1 & 2
Billings 		420 1 0
Custer Rest Area Eastbound
Billings 		400 0 0
Custer Rest Area Westbound
Billings 		400 0 0
Zoomontana INC
Billings 		324 0 0
Shepherd Dollar General Water System
Shepherd 		303 0 0
Camelot Ranch Event Center
Billings 		300 1 0
Northwest Water Conditioning Culligan W
Laurel 		300 0 0
Peter Yegen JR Golf Club
Billings 		300 1 0
Town and Country Dba Market Basket
Billings 		300 0 0
New Life Church
Billings 		250 0 0
Pictograph Cave State Park
Billings 		250 0 0
Western Ranch Supply
Billings 		215 1 0
Canyon Creek School District 4
Billings 		200 1 0
Eagle Rock Golf Course
Billings 		200 1 0
Elder Grove School Building Five
Billings 		200 1 0
Yellowstone Drag Strip
Acton 		200 1 0
Blue Creek School Dist 3
Billings 		198 2 0
Billings Christian Schools
Billings 		130 0 0
First Student INC
Billings 		130 1 0
Billings Christian High School
Billings 		125 2 0
Longbranch Casino
Ballantine 		120 0 0
Town and Country Lanes and Bar
Billings 		101 2 0
Big Sky Speedway
Billings 		100 1 0
Custer School Dist NO 15
Custer 		100 1 1
Fat Fender Freddys
Laurel 		100 0 0
Pompey's Pillar National Monument
Pompeys Pillar 		100 1 0
Furniture Row Billings
Billings 		90 0 0
Sunshine Academy Shepherd
Shepherd 		80 0 0
Fedex Relay Center
Billings 		74 2 0
Emmanuel Lutheran Church
Shepherd 		70 1 1
Pioneer School Dist 41
Billings 		70 0 0
Storybook Hollow
Billings 		70 0 0
Sunshine Academy Laurel
Laurel 		65 1 1
Slumberland Furniture
Billings 		64 0 0
Yellowstone Ice and Water Unapproved
Billings 		61 2 0
Billings Peterbilt
Billings 		60 2 0
Kid Corral Day Care
Shepherd 		60 2 0
Pacific Steel and Recycling
Billings 		60 1 0
3 North Bar and Grill
Acton 		50 1 0
Primo Refill Wal-Mart Heights
Billings 		50 0 0
Primo Refill Wal-Mart NO 4412
Laurel 		50 0 0
Morin Elementary School
Billings 		48 0 0
American Water Technologies
Billings 		40 0 0
Mickeys the
Shepherd 		40 1 0
Primo Refill Wal-Mart NO 1956
Billings 		40 0 0
Red Rooster Bar
Shepherd 		40 1 0
Albertsons Blgs Central NO 2030
Billings 		30 0 0
Albertsons Blgs Grand Ave NO 2041
Billings 		30 0 0
Albertsons Blgs NO 2027
Billings 		30 0 0
Albertsons Blgs NO 2047
Billings 		30 0 0
Church of Christ
Billings 		30 0 0
Cop Construction LLC
Billings 		30 1 0
Junction City Saloon
Custer 		30 1 0
Pryor Creek Bar and Cafe
Huntley 		30 0 0
Primo Refill Albertsons NO 3447 Laurel
Laurel 		26 0 0
Lockwood Iga Blgs Sparkling Pure
Billings 		25 0 0
Primo Refill Albertsons Billings 3367
Billings 		25 0 0
The Fort at 49 LLC
Custer 		25 3 1
Winco Foods #155 Billings
Billings 		25 0 0
Inactive systems (178, no longer operating or reporting)

Kept for the record and excluded from the county totals above. Browse inactive systems.

About this data

Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Montana records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.