PlainWater
Counties → Montana

Madison County, Montana

Water Systems
45
Population Served
14,392
Total Violations
4,771
243 health-based
PFAS Detected
1
of 1 tested

Violation Analysis

100.0%
Systems with Violations
106.0
Avg Violations per System
5.1%
Health-Based Violations

Water Source Types

GW
45 systems (100%)

PFAS Contamination

1
Systems Tested
1
PFAS Detected
100.0%
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

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

No violations on record (0) One or more violations (45)

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
Big Sky County Water and Sewer Dist 363 4,132 97 Detected
Virginia City Water Dept 1,500 162 -
Ennis Town Of 1,400 175 -
Sheridan Town Of 632 123 -
Nevada City 621 68 -
Earthquake Lake Visitor Center 503 33 -
Ennis S Raynolds Pass Rest Area 500 45 -
Andesite Ridge Water System 450 34 -
Twin Bridges Town Of 424 18 -
Galloups Slide Inn Inc 365 145 -
Mt Moonlight Basin 355 55 -
Lower Pioneer Mountain Water System 350 168 -
Palisades Campground 300 38 -
Wade Lake Hilltop Cliff Point Cg 220 21 -
Ennis Hot Springs Business Park Inc 216 91 -
Norris Hot Springs 204 90 -
Valley Garden Golf Village HOA 195 169 -
Ruby Valley Campground 151 63 -
Red Mountain Campground 150 31 -
Madison Valley Baptist Church Unapproved 120 16 -
Madison County Golf Assoc 108 239 -
Town Haul Diner 107 290 -
Ruby Creek Campground 100 23 -
Harrison School District No 23 100 1,139 -
Encampment Trail 100 180 -
Chicks Bar 98 60 -
Indiana Univ Geologic Station 92 62 -
West Fork Cabin Camp 90 49 -
Lake Shore Lodge 75 101 -
Madison River Recreation Area 75 26 -
Lds Church Ennis 70 116 -
Driftwaters Resort 63 223 -
McAllister Lodging 63 47 -
Rainbow Valley Motel 52 138 -
El Western Resort 52 10 -
Lds Church Sheridan 50 7 -
Garnet USA 45 99 -
Madison Double R Ranch 45 21 -
Lone View Ridge Water System 37 7 -
Trapper Springs Campground and Day Use 35 50 -
Magris Talc USA, Inc Yellowstone Mine 32 62 -
Alder School 30 26 -
Dream Drift Flies 30 2 -
Mill Creek Campground 30 52 -
Elkhorn Trailer Court 25 100 -

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 Madison County? ▼
Madison County has 4,771 total drinking water violations across 45 water systems, of which 243 are health-based violations. 100.0% of systems have at least one violation.
How many people get water from Madison County systems? ▼
Water systems in Madison County serve approximately 14,392 people through 45 public water systems.
Has PFAS been detected in Madison County water? ▼
Of 1 water systems tested for PFAS in Madison County, 1 had PFAS detected (100.0% detection rate).
What types of water sources supply Madison County? ▼
Water systems in Madison County use GW (45 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. 5.1% of Madison 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.