PlainWater
Counties → Colorado

Weld County, Colorado

Water Systems
77
Population Served
359,543
Total Violations
4,558
558 health-based
PFAS Detected
3
of 15 tested

Violation Analysis

83.1%
Systems with Violations
59.2
Avg Violations per System
12.2%
Health-Based Violations

Water Source Types

SW
40 systems (52%)
GW
10 systems (13%)

PFAS Contamination

15
Systems Tested
3
PFAS Detected
20.0%
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

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

No violations on record (8) One or more violations (42)

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
Greeley City Of 132,310 49 Clean
Firestone Town Of 27,798 41 Clean
Johnstown Town Of 24,725 294 Clean
Windsor Town Of 23,500 14 Clean
Evans City Of 19,369 58 Clean
Frederick Town Of 17,173 43 Clean
North Weld County WD 15,890 3 Clean
Ft Lupton City Of 12,099 328 Clean
Severance Town Of 11,733 30 Clean
Milliken Town Of 9,200 331 Clean
Central Weld Cnty WD 7,662 8 Clean
Eaton Town Of 7,328 39 Clean
Dacono City Of 6,900 16 Clean
Lochbuie Town Of 6,830 88 Detected
Keenesburg Town Of 4,650 161 -
Ault Town Of 4,220 22 -
Hudson Town Of 3,350 184 Clean
Platteville Town Of 2,900 36 -
Kersey WD 2,101 47 -
La Salle Town Of 2,010 71 -
Aristocrat Ranchette Water Project 1,260 32 -
Gilcrest Town Of 1,150 15 -
Pierce Town Of 1,094 212 -
Stoneybrook MHP 1,073 0 -
Cave Creek 1,025 0 -
Longview MHP 1,000 15 -
Villa West 833 1 -
River Valley Mhc 803 0 -
McDonald Farms Enterprises Inc 772 62 -
Friendly Village of Greeley MHP 660 43 -
Prairie Greens MHP 654 13 -
Nunn Town Of 499 15 -
Eagle Crest MHP 441 12 -
Countryside of Greeley 435 6 -
Stoneybrook Pointe 355 2 -
Wattenberg Improvement Assoc 350 73 -
Woodlands East 350 0 -
Briggsdale WC 303 57 -
Country Estates Mobile Home Park 297 0 -
Terrace Park MHP 297 57 -
Prairie Elem at New Raymer 275 446 -
Copper Key Village MHP 260 0 -
Tagawa Greenhouses Inc 250 278 -
New Vision MHP 200 120 -
Briggsdale School 194 39 -
Greeley Mobile Manor 180 0 -
Green Acres Mobile Home Park 180 0 -
Greeley RV Park 164 89 -
Salt & Acres 158 25 -
Serenity Ridge Vault Connection 157 24 -

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 Weld County? ▼
Weld County has 4,558 total drinking water violations across 77 water systems, of which 558 are health-based violations. 83.1% of systems have at least one violation.
How many people get water from Weld County systems? ▼
Water systems in Weld County serve approximately 359,543 people through 77 public water systems.
Has PFAS been detected in Weld County water? ▼
Of 15 water systems tested for PFAS in Weld County, 3 had PFAS detected (20.0% detection rate).
What types of water sources supply Weld County? ▼
Water systems in Weld County use SW (40 systems), GW (10 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. 12.2% of Weld 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.