PlainWater
Counties → Montana

Yellowstone County, Montana

Water Systems
116
Population Served
168,956
Total Violations
16,006
1,072 health-based
PFAS Detected
7
of 7 tested

Violation Analysis

93.1%
Systems with Violations
138.0
Avg Violations per System
6.7%
Health-Based Violations

Water Source Types

SW
27 systems (23%)
GW
23 systems (20%)

PFAS Contamination

7
Systems Tested
7
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

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

No violations on record (4) One or more violations (46)

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
Billings City Of 114,000 4 Clean
Co Water Dist of Billings Heights 12,000 11 Clean
Laurel Municipal Water System 6,339 141 Clean
Lockwood Water and Sewer District 5,900 12 Clean
Rocky Mountain College 5,700 9 Clean
Montana State University Billings 2,999 0 Clean
Pioneer Water Service 900 42 -
Worden Ballantine Yellowstone 800 403 -
Meadowlark of Billings LLC 800 52 -
Shepherd Schools 800 42 -
Golden Meadows Subdivision 772 2 -
Fisher Water Service 750 75 -
Hillside Village 650 143 -
Travel Centers of America Truck Plaza 600 17 -
Cherry Creek Estates LLC 600 62 -
Elder Grove Middle School Bldg 6 600 26 -
Windsor Estates 530 126 -
Pryor Creek Water Assn 475 166 -
Elder Grove School Buildings 1 & 2 420 13 -
Custer Rest Area Eastbound 400 31 -
Custer Rest Area Westbound 400 43 -
Sundance Subdivision 378 0 -
Stone Creek Subdivision 378 0 -
Hidden Lake Yellowstone County W and S D 350 643 -
Zoomontana Inc 324 42 -
Emerald View Park 320 31 -
Shiloh Road Development 315 3 -
Shepherd Dollar General Water System 303 0 -
Northwest Water Conditioning Culligan W 300 21 -
Peter Yegen JR Golf Club 300 81 -
Town and Country Dba Market Basket 300 70 -
Camelot Ranch Event Center 300 33 -
New Life Church 250 185 -
Pictograph Cave State Park 250 31 -
Precision Water 250 17 -
Granite Park Water Association 250 50 -
Golden Meadows Subdivision 2nd Cc 245 2 -
Yellowstone Boys and Girls Ranch 240 691 -
Wells Garden Estates 240 280 -
Huntley Yellowstone Co Water and Sewer 230 51 -
Crystal Springs Water System 225 683 -
The Nines Subdivision 220 6 -
Western Ranch Supply 215 33 -
Broadview Town Of 200 358 -
Canyon Creek School District 4 200 66 -
Elder Grove School Building Five 200 35 -
Oak Ridge Estates 200 373 -
Eagle Rock Golf Course 200 151 -
Yellowstone Drag Strip 200 151 -
Go 2 U Water Delivery 200 13 -

Other Counties in Montana

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
Silver Bow County
23 systems · 42,630 served · 2,525 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Yellowstone County? ▼
Yellowstone County has 16,006 total drinking water violations across 116 water systems, of which 1,072 are health-based violations. 93.1% of systems have at least one violation.
How many people get water from Yellowstone County systems? ▼
Water systems in Yellowstone County serve approximately 168,956 people through 116 public water systems.
Has PFAS been detected in Yellowstone County water? ▼
Of 7 water systems tested for PFAS in Yellowstone County, 7 had PFAS detected (100.0% detection rate).
What types of water sources supply Yellowstone County? ▼
Water systems in Yellowstone County use SW (27 systems), GW (23 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. 6.7% of Yellowstone 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.