PlainWater
Counties → Colorado

Larimer County, Colorado

Water Systems
136
Population Served
519,497
Total Violations
9,218
1,783 health-based
PFAS Detected
5
of 14 tested

Violation Analysis

93.4%
Systems with Violations
67.8
Avg Violations per System
19.3%
Health-Based Violations

Water Source Types

SW
37 systems (27%)
GW
13 systems (10%)

PFAS Contamination

14
Systems Tested
5
PFAS Detected
35.7%
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

Larimer Colorado 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
Ft Collins City Of 179,901 49 Clean
Loveland City Of 95,471 23 Clean
Ft Collins Loveland WD 63,532 7 Clean
East Larimer County WD 27,944 37 Clean
Csu Main and West Housing Campus 27,375 50 Clean
Little Thompson WD 25,654 7 Detected
Estes Park Town Of 16,722 22 Clean
Berthoud Town Of 14,211 224 Clean
Wellington Town Of 11,500 113 Clean
Csu South Campus 5,164 20 Clean
Northern Colorado WA 4,675 101 Clean
Csu Foothills Campus 4,483 19 Detected
West Fort Collins WD 4,000 59 Clean
YMCA Rockies Wind River 3,730 580 Clean
Fall River Pass 3,300 21 -
Spring Canyon WSD 2,320 157 -
Timber Ridge MHP 1,736 2 -
Harmony Village MHP 1,215 0 -
Cloverleaf Colorado LLC 1,007 9 -
Poudre Valley Mhc 985 10 -
Collins Aire Mhc 946 14 -
Rmnp Headquarters East 900 21 -
Lago Vista Mobile Home Park 842 17 -
Hickory Village 816 8 -
Pinewood Springs WD 745 264 -
Estes Park Cg at Marys Lake 700 50 -
Rocky Mountain Gateway 686 22 -
Mountain Park Cg 548 26 -
Cheley Colorado Camp Main 500 62 -
Glacier Basin 500 0 -
Longs Peak Cg 500 15 -
Hermit Park Open Space 464 74 -
Sunset Park Mhc 462 14 -
Riverview Cg 450 147 -
Sunset WD 425 79 -
Jellystone Park of Estes Park 423 53 -
Kennedy Mountain Campus 417 14 -
Chambers Lake Cg 408 56 -
Big Elk Meadows WA 405 302 -
Skyline 402 0 -
Consolidated Glacier View Meadows Assoc 395 261 -
Tunnel Cg 392 21 -
Apple & Cherry Ridge Village 350 2 -
Ben Delatour Boy Scout Camp 345 125 -
Windcliff POA 337 17 -
North Carter Lake WD 328 21 -
Alpine Vista Village 313 0 -
Fox Acres Comm Serv Corp 306 12 -
Aspen Ridge Mhc 302 17 -
West Lake Cg 296 32 -

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
Boulder County
82 systems · 428,472 served · 7,231 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Larimer County? ▼
Larimer County has 9,218 total drinking water violations across 136 water systems, of which 1,783 are health-based violations. 93.4% of systems have at least one violation.
How many people get water from Larimer County systems? ▼
Water systems in Larimer County serve approximately 519,497 people through 136 public water systems.
Has PFAS been detected in Larimer County water? ▼
Of 14 water systems tested for PFAS in Larimer County, 5 had PFAS detected (35.7% detection rate).
What types of water sources supply Larimer County? ▼
Water systems in Larimer 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. 19.3% of Larimer 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.