PlainWater
Counties → Colorado

Weld County, Colorado

SDWIS compliance plate

Sheet CO123 · Weld County 77 sys · 4,558 viol · #196/3254

VIOL-SEVERE · HEALTH-LOW · RANK-TOP · BELOW-PEER · PFAS-LOW · SRC-SW · SYS-MID · BOOK-FULL

  • VIOL-SEVERE 83.1% flagged
  • HEALTH-LOW 12.2% health
  • RANK-TOP #196/3254
  • BELOW-PEER 1.5 pp cleaner
  • PFAS-LOW 6.7% detect
  • SRC-SW SW lead 64%
  • SYS-MID 77 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Montrose County (+ 1.5 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Weld County ranks #196 of 3,254 counties by people served, and #9 of 64 counties in Colorado. See methodology · corpus placement.

Weld County standing, lower-flagged corpus third

Flagged-system rate 83.1% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 12.2% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 6.7% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #196 of 3,254 · #9 of 64 in Colorado.

Flagged-rate neighbourhood around Weld County

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

0% 20% 40% 60% 80% 100% Broomfield · lowest Weld · this county Jefferson · near Kiowa · highest 66.7% 80% 83.1% 84.6% 85% 86% 100%

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

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 -

Compare beyond Colorado

Lower-flagged peers for Weld County

Cross-state counties nearest Weld County on flagged-system share (83.1%) and cumulative violation count (4,558). 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.