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Counties → Colorado

Larimer County, Colorado

SDWIS compliance plate

Sheet CO069 · Larimer County 136 sys · 9,218 viol · #134/3254

VIOL-SEVERE · HEALTH-LOW · RANK-TOP · PHOTO-FINISH · PFAS-LOW · SRC-GW · SYS-LARGE · BOOK-FULL

  • VIOL-SEVERE 93.4% flagged
  • HEALTH-LOW 19.3% health
  • RANK-TOP #134/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-LOW 14.3% detect
  • SRC-GW GW lead 51%
  • SYS-LARGE 136 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Hinsdale County (+ 0 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Larimer County ranks #134 of 3,254 counties by people served, and #6 of 64 counties in Colorado. See methodology · corpus placement.

Larimer County standing, mid-flagged corpus third

Flagged-system rate 93.4% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 19.3% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 14.3% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #134 of 3,254 · #6 of 64 in Colorado.

Flagged-rate neighbourhood around Larimer County

Lowest/highest poles plus in-state counties nearest Larimer County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Broomfield · lowest Hinsdale · near Park · near Kiowa · highest 66.7% 92.9% 93.3% 93.4% 93.5% 94% 100%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

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 -

Compare beyond Colorado

Mid-flagged peers for Larimer County

Cross-state counties nearest Larimer County on flagged-system share (93.4%) and cumulative violation count (9,218). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - 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

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.