Tapcensus

Water quality in Johnstown, Colorado

Johnstown is in Weld County. 79 active public water systems serve the county; 39 had an EPA violation in the past three years.

Most likely your provider

Johnstown Town of CO0162418 · Community water system · Surface water
Serves 27,295 people Rules violated, past 3 years 1 Last sanitary survey Nov 7, 2023 Distance 2.7 mi

Your location is within the outer bounds of this system's EPA service area.

View system details EPA facility report

Other community water systems in Weld County

57 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
Windsor Town of
 23,500 0 6.4 mi
Milliken Town of
 9,200 2 6.9 mi
Serenity Ridge Vault Connection
Berthoud		 157 0 7.8 mi
Greeley City of
 132,310 2 9.0 mi
Severance Town of
 11,733 2 11.4 mi
Cave Creek
Evans		 1,025 0 11.8 mi
Gilcrest Town of
 1,150 0 12.4 mi
Evans City of
 19,369 2 13.4 mi
Platteville Town of
 2,900 0 13.8 mi
LA Salle Town of
 2,010 4 14.0 mi
Central Weld Cnty WD
 7,662 0 15.3 mi
Eagle Crest MHP
 441 0 16.0 mi
Firestone Town of
 27,798 0 16.2 mi
Eaton Town of
 7,328 3 16.7 mi
North Weld County WD
 15,890 0 16.9 mi
Ault Town of
 4,220 2 18.3 mi
Frederick Town of
 17,173 2 19.0 mi
Pierce Town of
 1,094 0 20.4 mi
Dacono City of
 6,900 1 21.0 mi
Fox Hill Water Association INC
 44 0 21.3 mi
Kersey WD
 2,101 1 21.4 mi
Aristocrat Ranchette Water Project
 1,715 3 22.0 mi
FT Lupton City of
 12,099 3 22.7 mi
Nunn Town of
 499 0 24.3 mi
Wattenberg Improvement Assoc
 350 1 25.6 mi
All 58 community water systems in Weld County
Non-community systems in Weld County (21: schools, campgrounds, workplaces, restaurants)

These systems serve places you visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
RM INC
 52 0 0
Greeley RV Park South
 126 0 0
Salt & Acres
 158 3 0
Fourway Baptist Church
 45 0 0
Great Guns Sporting
 33 2 1
Tagawa Greenhouses INC
 250 1 0
Mountain States Jatc Training Facility
 100 0 0
Ceesi
 30 1 1
Wild Animal Sanctuary the
 97 0 0
Roggen Motel
 27 0 0
Opal Foods LLC Roggen Farm
 27 0 0
Cardinal Community Academy
 120 0 0
Briggsdale School
 194 1 0
Prairie Elem at New Raymer
 275 2 0
Peak Oilfield Services LLC
 150 3 1
Crow Valley Campground
 57 2 1
Stoneham Village
 51 2 0
Opal Foods LLC Hudson Farm
 49 2 2
Redtail Gas Plant
 48 0 0
Rocky Mountain Energy Center
 39 0 0
Shortgrass Steppe Campus
 30 1 0
About this data

Water systems are matched to Weld County, nearest to Johnstown first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files.

Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Colorado records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.