Tapcensus

Montana

Lake County drinking water quality

88 active public water systems serve 19,562 people in Lake County. 47 are compliant, 41 had at least one EPA violation in the past three years, 0 are designated serious violators, and 1 carries a health flag.

Active systems 88 25 community systems
People served 20K by public water systems
Systems with violations 41 47% of active systems, past 3 years
Serious violators 0 1 systems carry a health flag

Needs attention

Rollins Restaurant RV Park MT0001027 · Rollins · Transient non-community system · Serves 97 2 rules violated in the past three years. Unresolved: Revised Total Coliform Rule.

Community water systems

25 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
Polson City of
Polson 		5,300 2 0
Ronan City of
Ronan 		2,483 3 0
Pablo Lake County Water and Sewer Dist
Pablo 		2,175 2 0
ST Ignatius Town of
St Ignatius 		700 4 1
Woods Bay Water and Sewer District
Bigfork 		685 0 0
Consolidated Charlo Lake CO W and S Dist
Charlo 		450 2 0
Round Butte Water Company
Ronan 		400 0 0
Jette Meadows Lake CO W and S Dist
Polson 		375 0 0
Jette Lake Landowners Association
Polson 		295 1 1
Ridgewood Estates
Bigfork - Lake Co 		250 1 0
Mission Meadows RV Campsite Park, INC
Ronan 		200 1 0
Mission Mountain Lake CO W and S Dist
Ronan 		118 0 0
Paradise Pines
Polson 		95 2 0
Clearview Heights Lake County Water Dist
Polson 		90 1 0
Mission Mountain View HOA
Ronan 		80 1 0
Christian Childrens Ranch
St Ignatius 		65 0 0
South Hills Water Users Association
Polson 		60 0 0
Shelter Bay Estates
Rollins 		56 0 0
Kootenai Woods Subdivision
Bigfork 		53 0 0
Crane Mountain Estates
Bigfork - Lake Co 		50 1 0
Stone Ridge Water Company
Polson 		50 1 0
Overlook Subdivision
Polson 		49 1 0
Pinewood Shores Wua
Polson 		46 1 0
Pleasant View Water and Sewer District
Polson 		45 0 0
Ponderilla Hills Lake County Water Sewer
Polson 		35 1 0
Non-community systems (63: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Wilson Foods
Arlee 		600 2 1
Montana Council of Boy Scouts of America
Big Arm 		259 0 0
Sitting Duck
Bigfork - Lake Co 		200 0 0
Rocky Mountain Twist
Ronan 		195 0 0
Ivanhoe Water INC
Polson 		178 2 0
Arlee Junior High School
Arlee 		175 1 0
Camp Tuffit LLC
Proctor 		151 0 0
Swan Lake Annex Campground
Swan Lake 		150 0 0
Arlee High School Dist NO 8
Arlee 		145 1 0
Outback Montana RV Park
Bigfork - Lake Co 		130 1 0
Finley Point MT State Park
Polson 		120 0 0
Finley Point Grill
Polson 		112 0 0
Mountain Lake Lodge
Bigfork 		110 0 0
N8v Grown
Charlo 		103 3 2
Raven Bar
Bigfork - Lake Co 		100 0 0
Safeway NO 1646
Polson 		100 0 0
Rollins Restaurant RV Park
Rollins 		97 2 1
Paradise Cove
Polson 		89 0 0
Flathead Lake United Methodist Camp
Rollins 		86 1 0
Flathead River RV Resort
Polson 		84 0 0
Designs for Health INC
Arlee 		82 0 0
Ninepipes Lodge LLC
Charlo 		80 2 0
Woods Bay Marina
Bigfork - Lake Co 		79 0 0
A Bar
Bigfork - Lake Co 		77 0 0
The Chuck Wagon Bar & Grill LLC
Dayton 		77 0 0
Big Arm Flathead Lake MT ST PK
Big Arm 		75 0 0
Atanaha Event Center
 74 1 0
Bison Inn Cafe
Ravalli 		73 1 0
Mission Country Market
St Ignatius 		72 2 0
Meadow Brook Christian Fellowship Church
Proctor 		70 0 0
Mission Valley United Methodist Church
St Ignatius 		70 1 1
Point Service Corporation
Bigfork - Lake Co 		70 0 0
Flathead Lake Biological Station U of M
Polson 		66 0 0
Lake County Transfer Station
Polson 		62 0 0
Glacier Conference Center
Lakeside 		61 0 0
Sanders Water System
Arlee 		60 3 0
West Shore Flathead MT ST Park
Lakeside 		60 0 0
Camp Marshall
Polson 		57 2 0
Polson KOA
Polson 		55 0 0
Darrell Fenner 4h Camp
Bigfork - Lake Co 		53 1 0
Laughing Horse Lodge
Swan Lake 		53 0 0
Polson Foursquare Church
Polson 		50 1 0
Primo Refill Wal-Mart Num 2607 Polson
Polson 		50 0 0
Flathead Lake Resort
Bigfork - Lake Co 		45 1 0
Mission Valley Church of Christ
Polson 		45 0 0
Lake Mary Ronan State Park
Proctor 		44 0 0
North Big Arm Bay Loa
Elmo 		43 0 0
Tamarack of the Wildwood
Lakeside 		42 0 0
Christian and Missionary Alliance Church
Polson 		40 2 0
Seven Acres
Ronan 		37 2 0
Camp Ponderosa LLC
Swan Lake 		35 0 0
Diamond S RV Park Ronan
Ronan 		33 2 1
Many Springs Flathead Lake Resort
Bigfork 		28 1 0
Mountain Meadows Lodge and Resort
Proctor 		28 0 0
Eastman Villa Water CO
Proctor 		26 0 0
Lake Mary Ronan Lodge and Resort
Proctor 		26 1 0
Timberlane Resort
Polson 		26 1 0
Bielenberg Landing HOA
Swan Lake 		25 0 0
Birch Glen HOA
Swan Lake 		25 0 0
Dayton Harbor Cottages
Dayton 		25 1 0
Primo Refill Rod's Harvest Foods ST Ign
St Ignatius 		25 0 0
Yellow Bay Flathead MT ST Park
Polson 		25 0 0
Kootenai Lodge Estates
Swan Lake 		24 0 0
Inactive systems (103, 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.