PlainWater
Counties → Montana

Flathead County, Montana

Water Systems
324
Population Served
105,538
Total Violations
20,270
2,309 health-based
PFAS Detected
3
of 6 tested

Violation Analysis

93.5%
Systems with Violations
62.6
Avg Violations per System
11.4%
Health-Based Violations

Water Source Types

GW
49 systems (15%)
SW
1 system (0%)

PFAS Contamination

6
Systems Tested
3
PFAS Detected
50.0%
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

Flathead 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
Kalispell Public Works 25,000 224 Detected
Whitefish City Of 10,418 102 Clean
Flathead County Water and Sewer 7,775 19 Clean
Bigfork County Water and Sewer 6,100 43 Clean
Columbia Falls City Of 4,450 99 Clean
Ridge Run 3,500 15 -
Glacier Park International Airport 2,680 31 -
Big Mountain Water Company 2,435 415 -
Lakeside Water System 1,225 16 -
Hungry Horse Co Water and Sewer District 1,135 108 -
Meadow Lake Co Water and Sewer District 950 112 -
Town Pump Columbia Falls 2 910 9 -
Glacier Bible Camp 903 11 -
Somers Co Water and Sewer Dist 765 26 -
Easthaven Baptist Church 700 10 -
West Valley School District No 1 650 17 -
Hope Church 650 32 -
Ptarmigan Village Inc 600 46 -
Glacier Raft Company 515 17 -
Big Sky Water Slide Col Falls 500 49 -
Headquarters Apgar 500 11 -
Lds Church Columbia Falls 500 8 -
Flathead Co Water District No 8 475 558 -
Coram County Water and Sewer District 450 46 -
Greenacres County Water and Sewer Dist 450 9 -
Country Estates Water Supply 430 112 -
Woodys Country Store 418 108 -
Blacktail Grocery 413 18 -
Meadow Manor 410 20 -
Lake McDonald Lodge 400 1 -
Forest Acres Tr Pk Whitefish 390 54 -
West Glacier KOA Campground 360 56 -
Cherry View 352 17 -
Stillwater Christian School 350 29 -
Martin City County Water District 340 18 -
Iron Horse Homeowners Assoc 335 63 -
Glacier View Golf Club 319 107 -
Ferndale Market Ferndale 310 59 -
Southside Public Water Supply 306 19 -
Majestic Valley Arena 306 10 -
Archer Acres 305 7 -
Mountain Villa Apts Kalispell 300 9 -
Snowline Acres 300 6 -
Northern Pines Community HOA 295 133 -
Smith Valley School Lower 280 16 -
Ap Williams 280 44 -
Ridgewood Terrace MHP 280 20 -
Rocky Mountain HI RV Park 275 87 -
Alpine Pacific Utilities 270 104 -
Glacier Ridge HOA & Water Association 262 40 -

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
Cascade County
98 systems · 96,521 served · 15,613 violations
Lewis and Clark County
162 systems · 67,948 served · 24,270 violations
Silver Bow County
23 systems · 42,630 served · 2,525 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Flathead County? ▼
Flathead County has 20,270 total drinking water violations across 324 water systems, of which 2,309 are health-based violations. 93.5% of systems have at least one violation.
How many people get water from Flathead County systems? ▼
Water systems in Flathead County serve approximately 105,538 people through 324 public water systems.
Has PFAS been detected in Flathead County water? ▼
Of 6 water systems tested for PFAS in Flathead County, 3 had PFAS detected (50.0% detection rate).
What types of water sources supply Flathead County? ▼
Water systems in Flathead County use GW (49 systems), SW (1 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. 11.4% of Flathead 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.