PlainWater
Counties → Montana

Lake County, Montana

Water Systems
91
Population Served
19,815
Total Violations
7,834
1,005 health-based
PFAS Detected
0
of 1 tested

Violation Analysis

95.6%
Systems with Violations
86.1
Avg Violations per System
12.8%
Health-Based Violations

Water Source Types

GW
46 systems (51%)
SW
4 systems (4%)

PFAS Contamination

1
Systems Tested
0
PFAS Detected
0.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Lake Montana water systems by violation status, EPA SDWIS records.

No violations on record (0) One or more violations (50)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Polson City Of 5,300 242 Clean
Ronan City Of 2,483 259 -
Pablo Lake County Water and Sewer Dist 2,175 69 -
St Ignatius Town Of 700 168 -
Woods Bay Water and Sewer District 685 106 -
Wilson Foods 600 101 -
Consolidated Charlo Lake Co W and S Dist 450 179 -
Round Butte Water Company 400 38 -
Jette Meadows Lake Co W and S Dist 375 157 -
Jette Lake Landowners Association 295 35 -
Ridgewood Estates 250 366 -
Mission Meadows RV Campsite Park, Inc. 200 67 -
Sitting Duck 200 107 -
Rocky Mountain Twist 195 80 -
Ivanhoe Water Inc 178 208 -
Arlee Junior High School 175 236 -
Aunties Emporium 160 88 -
Camp Tuffit LLC 151 27 -
Arlee Elementary School 150 235 -
Swan Lake Annex Campground 150 13 -
Arlee High School Dist No 8 145 339 -
Outback Montana RV Park 130 32 -
Finley Point Mt State Park 120 13 -
Mission Mountain Lake Co W and S Dist 118 14 -
Finley Point Grill 112 26 -
Mountain Lake Lodge 110 35 -
Montana Bonfire, LLC 107 54 -
N8v Grown 103 76 -
Raven Bar 100 68 -
East Shore Smoke House 100 62 -
Safeway No 1646 100 8 -
Rollins Restaurant RV Park 97 46 -
Paradise Pines 95 35 -
Clearview Heights Water Assn 90 200 -
Paradise Cove 89 78 -
Flathead Lake United Methodist Camp 86 64 -
Flathead River RV Resort 84 198 -
Designs for Health Inc 82 49 -
Ninepipes Lodge LLC 80 51 -
Mission Mountain View HOA 80 139 -
Woods Bay Marina 79 59 -
A Bar 77 179 -
The Chuck Wagon Bar & Grill LLC 77 189 -
Big Arm Flathead Lake Mt St Pk 75 61 -
Atanaha Event Center 74 30 -
Bison Inn Cafe 73 246 -
Stutzmans Country Market 72 51 -
Point Service Corporation 70 19 -
Mission Valley United Methodist Church 70 20 -
Meadow Brook Christian Fellowship Church 70 3 -

Other Counties in Montana

Yellowstone County
116 systems · 168,956 served · 16,006 violations
Gallatin County
207 systems · 147,444 served · 30,683 violations
Missoula County
243 systems · 138,758 served · 31,553 violations
Flathead County
324 systems · 105,538 served · 20,270 violations
Cascade County
98 systems · 96,521 served · 15,613 violations
Lewis and Clark County
162 systems · 67,948 served · 24,270 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Lake County? ▼
Lake County has 7,834 total drinking water violations across 91 water systems, of which 1,005 are health-based violations. 95.6% of systems have at least one violation.
How many people get water from Lake County systems? ▼
Water systems in Lake County serve approximately 19,815 people through 91 public water systems.
Has PFAS been detected in Lake County water? ▼
Of 1 water systems tested for PFAS in Lake County, 0 had PFAS detected (0.0% detection rate).
What types of water sources supply Lake County? ▼
Water systems in Lake County use GW (46 systems), SW (4 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 12.8% of Lake County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.