PlainWater
Counties → Montana

Ravalli County, Montana

Water Systems
129
Population Served
30,657
Total Violations
9,816
1,316 health-based
PFAS Detected
2
of 2 tested

Violation Analysis

93.0%
Systems with Violations
76.1
Avg Violations per System
13.4%
Health-Based Violations

Water Source Types

GW
49 systems (38%)
SW
1 system (1%)

PFAS Contamination

2
Systems Tested
2
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

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

No violations on record (5) 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
Hamilton City Of 5,585 18 Detected
Stevensville Town Of 2,090 76 -
Super One Food Store 1,769 335 -
Town Pump Woodside 1 1,198 16 -
Town Pump Florence 1 1,092 19 -
Florence Carlton School 1,025 70 -
Corvallis Gym and Middle School 900 6 -
Darby Town Of 850 639 -
Oles Country Store 820 37 -
Pinesdale Town Of 800 978 Clean
Lost Trail Rest Area 701 40 -
Lost Trail Powder Mtn Sula 690 61 -
Stokes Market Florence 600 33 -
Lone Pine Store 600 60 -
Gsk Biologicals 560 20 -
Canyons Athletic Club The 500 34 -
Corvallis Primary School 450 73 -
Roots Christian Fellowship 400 0 -
Lds Church Corvallis 320 29 -
Victor Dollar General 303 0 -
Lone Rock School District No 13 280 143 -
Trapper Creek Job Corps 275 233 -
Bowers Market Corvallis 274 43 -
Glens Cafe 223 57 -
Subway Sandwich Shop Hamilton 210 33 -
Florence Coffee Corvallis 207 0 -
Lost Trail Ski Area Yurt System 202 24 -
Bloom Montana 201 101 -
Pharaohplex 200 9 -
Victor Middle School and High School 185 73 -
Kootenai Creek Village 175 56 -
Hamilton Murdochs 164 0 -
Bowers Market Victor 156 39 -
Backyard Tap House 154 3 -
Town Pump Stevensville Ll 1 150 1 -
Hamilton Golf Club Snack Shop 150 77 -
Stock Farm The 150 54 -
Victor Grade School PWS 140 4 -
Bitterroot Health Stevensville 140 0 -
Corvallis Mobile Village 138 106 -
Corvallis Subway 125 6 -
Daly Estates Subdivision 123 92 -
Triple Creek Ranch 120 74 -
Wild Flower HOA, The 120 19 -
Centennial Homeowner's Association, Inc 115 25 -
Montana Frontier Cafe 110 19 -
McNulty Investments 110 5 -
Bear's Lair 107 15 -
Camp Sula 105 48 -
L and M Building 100 26 -

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 Ravalli County? ▼
Ravalli County has 9,816 total drinking water violations across 129 water systems, of which 1,316 are health-based violations. 93.0% of systems have at least one violation.
How many people get water from Ravalli County systems? ▼
Water systems in Ravalli County serve approximately 30,657 people through 129 public water systems.
Has PFAS been detected in Ravalli County water? ▼
Of 2 water systems tested for PFAS in Ravalli County, 2 had PFAS detected (100.0% detection rate).
What types of water sources supply Ravalli County? ▼
Water systems in Ravalli 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. 13.4% of Ravalli 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.