PlainWater
Counties → Montana

Jefferson County, Montana

Water Systems
42
Population Served
10,086
Total Violations
6,871
1,290 health-based
PFAS Detected
0
of 0 tested

Violation Analysis

97.6%
Systems with Violations
163.6
Avg Violations per System
18.8%
Health-Based Violations

Water Source Types

GW
40 systems (95%)
SW
2 systems (5%)

Compliance Snapshot

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

No violations on record (1) One or more violations (41)

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
Whitehall Town Of 1,500 689 -
Boulder City Of 1,400 376 -
Jefferson Hills Wua 780 170 -
Lewis and Clark Caverns Visitor Center 615 42 -
Jefferson City South Rest Stop 600 51 -
Montana City School Dist 27 534 66 -
Saddle Mountain Corp Clancy 350 58 -
Clancy Elementary School Dist 01 333 338 -
Forest Park Water Users Association 323 119 -
Pipestone RV Park 286 2 -
Blue Sky Heights Wua Clancy 250 244 -
Montana City Grill and Saloon 250 52 -
Chubbys Bar and Grill 211 361 -
Basin County Water and Sewer Dist 200 754 -
Park Lake Campground 200 59 -
Elkhorn Congregation of Jehovahs Witness 180 3 -
Golden Sunlight Mines Inc 160 536 -
Hangmans Tree Wua 158 55 -
Stoney Brook Village Condominium Assoc 142 125 -
Papa Rays Casino and Hugos Pizza 118 57 -
Jackson Creek Bar and Grille 115 279 -
L and C Caverns State Park Cg 114 15 -
Discovery Kid Zone Montessori 110 0 -
Lewis and Clark Caverns Visitor Contact 106 16 -
Jefferson City North Rest Stop 100 46 -
Lahood Park Cardwell 94 115 -
Elkhorn Health and Rehabilitation LLC 89 257 -
Jefferson Tracts Assoc Inc 80 185 -
Ash Grove Cement Company 75 360 -
Lds Church Whitehall 75 49 -
Cardwell School Dist 16 and 31 63 125 -
Montana City Mercantile Hardware Cafe 56 58 -
Boulder Hot Springs 55 36 -
City Lights Comm Subdi 55 337 -
Merry Widow Health Mine Unapproved 52 14 -
Sunnybrook Acres HOA 50 15 -
Cardwell Campground LLC 50 150 -
Red Cliff Estates HOA 48 119 -
Rocky Mountain Wua 30 177 -
Free Enterprise Radon Health Mine 27 34 -
Alhambra RV Park 27 15 -
Tings Bar 25 312 -

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 Jefferson County? ▼
Jefferson County has 6,871 total drinking water violations across 42 water systems, of which 1,290 are health-based violations. 97.6% of systems have at least one violation.
How many people get water from Jefferson County systems? ▼
Water systems in Jefferson County serve approximately 10,086 people through 42 public water systems.
Has PFAS been detected in Jefferson County water? ▼
No PFAS testing data is available for water systems in Jefferson County.
What types of water sources supply Jefferson County? ▼
Water systems in Jefferson County use GW (40 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. 18.8% of Jefferson 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.