PlainWater
Counties → Colorado

Boulder County, Colorado

Water Systems
82
Population Served
428,472
Total Violations
7,231
1,148 health-based
PFAS Detected
0
of 8 tested

Violation Analysis

90.2%
Systems with Violations
88.2
Avg Violations per System
15.9%
Health-Based Violations

Water Source Types

SW
37 systems (45%)
GW
13 systems (16%)

PFAS Contamination

8
Systems Tested
0
PFAS Detected
0.0%
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

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

No violations on record (6) One or more violations (44)

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
Boulder City Of 166,080 31 Clean
Longmont City Of 102,866 78 Clean
Erie Town Of 40,061 114 Clean
Lafayette City Of 28,700 262 Clean
Louisville City Of 20,975 149 Clean
Left Hand WD 20,280 213 Clean
Superior MD No 1 17,900 165 Clean
Longs Peak WD 3,200 4 -
Lyons Town Of 2,990 114 -
Nederland Town Of 2,406 63 -
Eldora Mountain Resort 2,400 210 Clean
Boulder Meadows MHP 1,657 52 -
Pine Brook Hills WD 1,100 16 -
Mile HI Water Inc Hauler 1,000 147 -
Arbordale Acres MHP 901 19 -
Boulder Ridge MHP 897 0 -
San Lazaro Mfctd Housing Community 844 479 -
Baseline WD 820 14 -
Countryside of Longmont 775 6 -
Vista Village MHP 750 52 -
Pawnee Cg 740 15 -
Fairview Conoco 700 58 -
Hoover Hills WSD 662 76 -
St Vrain MHP LLC 544 0 -
Eldora Mountain Restaurant 510 25 -
Shannon WSD 450 8 -
Kelly Dahl Cg 368 12 -
Skylark Mobile Home Community 342 12 -
Allenspark WSD 340 352 -
Camp Dick Cg 328 36 -
Eldorado Municipal System 308 30 -
East Boulder County WD 300 31 -
Jamestown Town Of 280 418 -
Meeker Park Lodge 270 244 -
Grand Meadow of Longmont MHP 255 0 -
Lefthand WSD Lake Pines 250 23 -
Olde Stage WD 250 30 -
Jacobs Corner 250 120 -
Wild Basin Es 250 0 -
Ward Town Of 230 46 -
Mountain View MHP 211 0 -
Glacier View Ranch 210 29 -
Lafayette Gardens 207 0 -
Colorado Mountain Ranch 205 65 -
Eldorado Corner Market 204 32 -
Girl Scouts Meadow Mtn Ranch 175 137 -
Stone Mountain Lodge and Cabins 160 435 -
Islamic Center of Boulder 157 75 -
Rock Creek Farm WS 151 15 -
Sans Souci MHP 150 501 -

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
Jefferson County
113 systems · 577,729 served · 5,182 violations
Larimer County
136 systems · 519,497 served · 9,218 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Boulder County? ▼
Boulder County has 7,231 total drinking water violations across 82 water systems, of which 1,148 are health-based violations. 90.2% of systems have at least one violation.
How many people get water from Boulder County systems? ▼
Water systems in Boulder County serve approximately 428,472 people through 82 public water systems.
Has PFAS been detected in Boulder County water? ▼
Of 8 water systems tested for PFAS in Boulder County, 0 had PFAS detected (0.0% detection rate).
What types of water sources supply Boulder County? ▼
Water systems in Boulder County use SW (37 systems), GW (13 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. 15.9% of Boulder 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.