PlainWater
Counties → Montana

Missoula County, Montana

Water Systems
243
Population Served
138,758
Total Violations
31,553
2,567 health-based
PFAS Detected
2
of 5 tested

Violation Analysis

95.1%
Systems with Violations
129.8
Avg Violations per System
8.1%
Health-Based Violations

Water Source Types

GW
48 systems (20%)
SW
2 systems (1%)

PFAS Contamination

5
Systems Tested
2
PFAS Detected
40.0%
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

Missoula 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
Missoula Water 68,200 84 Clean
University of Montana 15,000 26 Clean
Lolo Water and Sewer Dist 3,315 92 -
Town Pump Bonner 1 2,460 248 -
Clearwater Junction Rest Area 2,002 57 -
Seeley Lake Water District 1,575 187 -
Town Pump Lolo 2 1,556 44 -
El Mar Estates Msla Co Water 1,350 64 -
Wheat Montana at Muralts Travel Plaza 1,225 118 -
Town Pump Missoula 3 1,221 18 -
McGowan Water Cond Inc 1,207 43 -
Valley Christian Cafeteria 1,146 33 -
Travel Centers of America 1,120 203 -
Loves Travel Stop & Country Store Wye 1,050 92 -
Deanos Travel Plaza 959 69 -
Westview Mobile Home Park 947 2,111 -
Town Pump Missoula 7 Wye 935 49 -
Christian Life Center 846 165 -
Phantom Hills Water System 810 91 Clean
Frenchies Super Stop 808 16 -
Town Pump Lolo 1 744 41 -
Travois Village Mobile Park 702 47 -
Frenchtown Elementary School Dist 40 700 17 -
Target Range Main School 660 438 -
Greenfield Mobile Home Park 620 248 -
Lolo Super Stop 615 19 -
Frenchtown High School 550 13 Clean
Snowbowl Lodge 521 34 -
Green Investments 518 340 -
Wye Area Water System 512 93 -
Blessed Trinity Catholic Community 508 30 -
Peak Health and Wellness Center 506 92 -
Zootown Super Stop 504 41 -
Missoula KOA & El Mar Tlr Village 499 30 -
Olde Dairy 460 96 -
Bonner School District No 14 420 272 -
Clearwater Bar Paws Up Ranch 413 84 -
Seeley Lake Campground 404 16 -
The Historic Florence 400 228 -
Grant Creek Water Users Association Inc 380 87 -
Valley Christian School North 350 36 -
Paws Up Angus Ranch Main Complex 327 112 -
Culligan of Missoula 320 32 -
Frenchtown Pond State Park 300 6 -
Larchmont Golf Course 268 18 -
Taco Johns Reserve 264 24 -
Forlorn Hope LLC 262 59 -
Katoonah Lodges 258 29 -
Lolo Community Church 252 11 -
Sorrel Springs HOA 250 153 -

Other Counties in Montana

Yellowstone County
116 systems · 168,956 served · 16,006 violations
Gallatin County
207 systems · 147,444 served · 30,683 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
Silver Bow County
23 systems · 42,630 served · 2,525 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Missoula County? ▼
Missoula County has 31,553 total drinking water violations across 243 water systems, of which 2,567 are health-based violations. 95.1% of systems have at least one violation.
How many people get water from Missoula County systems? ▼
Water systems in Missoula County serve approximately 138,758 people through 243 public water systems.
Has PFAS been detected in Missoula County water? ▼
Of 5 water systems tested for PFAS in Missoula County, 2 had PFAS detected (40.0% detection rate).
What types of water sources supply Missoula County? ▼
Water systems in Missoula County use GW (48 systems), SW (2 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. 8.1% of Missoula 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.