PlainWater
Counties → Colorado

Jefferson County, Colorado

Water Systems
113
Population Served
577,729
Total Violations
5,182
1,029 health-based
PFAS Detected
5
of 8 tested

Violation Analysis

85.0%
Systems with Violations
45.9
Avg Violations per System
19.9%
Health-Based Violations

Water Source Types

SW
35 systems (31%)
GW
15 systems (13%)

PFAS Contamination

8
Systems Tested
5
PFAS Detected
62.5%
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

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

No violations on record (11) One or more violations (39)

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
Arvada City Of 171,610 18 Clean
Consolidated Mutual Maple Grove 81,400 18 Detected
Green Mountain WSD 49,400 6 -
Bancroft Clover WSD 44,000 0 -
Golden City Of 38,288 0 Clean
Bear Creek WSD 30,000 0 -
Wheat Ridge Water District 20,000 4 -
Evergreen MD 15,750 36 Clean
Ken Caryl WSD 12,000 0 -
Lakehurst WSD 12,000 0 -
Valley WD 10,000 0 -
North Table Mountain WSD 10,000 10 Clean
Morrison Town Of 9,887 276 Detected
Willowbrook WSD 9,348 0 -
Lakewood City Of 6,000 0 -
Edgewater City Of 5,300 13 -
High View WD 4,000 0 -
Genesee WSD 3,920 180 Clean
Meadowbrook WD 3,290 1 -
Molson Coors Beverage Company 2,725 23 -
South Sheridan Water and Sewer Dist 2,500 5 -
Alameda WSD 2,480 0 -
Conifer High School 2,350 48 -
Mountain WSD 1,941 221 -
Aspen Park MD 1,800 124 -
Ralston Valley WSD 1,610 2 -
Indian Hills WD 1,300 108 -
Bear Creek Lake Park 1,250 51 -
Tiny Town Historical Park 1,210 16 -
Staunton State Park 1,079 3 -
North Lincoln WSD 1,000 6 -
Homestead WC 1,000 244 -
Alta Convenience No 6152 1,000 19 -
Brook Forest WD 998 17 -
Marshdale Elem School 920 0 -
Golden Terrace West 825 22 Clean
Friends of Dinosaur Ridge 770 16 -
Mt Vernon Country Club 734 266 -
Elk Creek Elem School 600 37 -
Golden Terrace Village 580 22 -
Conifer WA 550 14 -
Conifer MD 525 518 -
Geneva Glen Camp 513 28 -
Granite Lake 506 16 -
Sheridan MHP 480 63 -
Mountainside Estates MHP 473 31 -
Golden Terrace South 425 25 -
Ramah in the Rockies 405 32 -
Forest Hills MD Riva Chase 400 190 -
Mother Cabrini Shrine 389 8 -

Other Counties in Colorado

Denver County
5 systems · 1,312,794 served · 487 violations
Arapahoe County
40 systems · 864,434 served · 5,553 violations
El Paso County
140 systems · 757,938 served · 21,020 violations
Adams County
86 systems · 711,442 served · 11,205 violations
Larimer County
136 systems · 519,497 served · 9,218 violations
Boulder County
82 systems · 428,472 served · 7,231 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Jefferson County? ▼
Jefferson County has 5,182 total drinking water violations across 113 water systems, of which 1,029 are health-based violations. 85.0% of systems have at least one violation.
How many people get water from Jefferson County systems? ▼
Water systems in Jefferson County serve approximately 577,729 people through 113 public water systems.
Has PFAS been detected in Jefferson County water? ▼
Of 8 water systems tested for PFAS in Jefferson County, 5 had PFAS detected (62.5% detection rate).
What types of water sources supply Jefferson County? ▼
Water systems in Jefferson County use SW (35 systems), GW (15 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. 19.9% 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.