Tapcensus

Colorado

Jefferson County drinking water quality

113 active public water systems serve 577,913 people in Jefferson County. 65 are compliant, 48 had at least one EPA violation in the past three years, 0 are designated serious violators, and 1 carries a health flag.

Active systems 113 47 community systems
People served 578K by public water systems
Systems with violations 48 42% of active systems, past 3 years
Serious violators 0 1 systems carry a health flag

Needs attention

North Lincoln Wsd CO0116552 · Community water system · Serves 1,000 1 rule violated in the past three years. Unresolved: Stage 1 Disinfectants and DBP Rule.

Community water systems

47 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
Arvada City of
 171,610 2 0
Consolidated Mutual Maple Grove
 81,400 0 0
Green Mountain Wsd
 49,400 0 0
Bancroft Clover Wsd
 44,000 0 0
Golden City of
 38,288 0 0
Bear Creek Wsd
 30,000 0 0
Wheat Ridge Water District
 20,000 0 0
Evergreen MD
 15,750 0 0
Ken Caryl Wsd
 12,000 0 0
Lakehurst Wsd
 12,000 0 0
North Table Mountain Wsd
 10,000 0 0
Valley WD
 10,000 0 0
Morrison Town of
 9,887 2 0
Willowbrook Wsd
 9,348 0 0
Lakewood City of
 6,000 0 0
Edgewater City of
 5,300 1 1
High View WD
 4,000 0 0
Genesee Wsd
 3,920 0 0
Meadowbrook WD
 3,290 0 0
South Sheridan Water and Sewer Dist
 2,500 0 0
Alameda Wsd
 2,480 0 0
Mountain Wsd
 1,941 4 0
Ralston Valley Wsd
 1,610 1 0
Indian Hills WD
 1,300 5 1
Homestead WC
 1,000 4 0
North Lincoln Wsd
 1,000 1 1
Brook Forest WD
 998 5 1
Golden Terrace West
Golden 		825 1 0
MT Vernon Country Club
 734 2 0
Golden Terrace Village
 580 1 0
Sheridan MHP
 480 2 0
Mountainside Estates MHP
 473 0 0
Golden Terrace South
Golden 		425 0 0
Forest Hills MD Riva Chase
 400 1 0
Blue Mountain WD
 350 0 0
Bonvue Water and Sanitation District
 350 0 0
Idledale Wsd
 350 8 1
Elevado Estates LLC
 250 1 0
Inspiration Valley MHP
 250 0 0
Majestic MHP
 232 0 0
Ridgewood Mobile Home Park
 196 1 0
Hidden Valley Water District
 155 4 0
Ken Caryl West Ranch WD
 140 2 0
Buffalo Creek WD
 125 0 0
Pleasant View Estates
 122 2 2
Park WC Wonderview
 90 0 0
Cragmont WC
 50 2 0
Non-community systems (66: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Molson Coors Beverage Company
 2,725 1 0
Conifer High School
 2,350 2 0
Aspen Park MD
 1,800 1 0
Bear Creek Lake Park
 1,250 2 0
Tiny Town Historical Park
 1,210 2 0
Staunton State Park
 1,079 0 0
Friends of Dinosaur Ridge
 1,020 0 0
Alta Convenience NO 6152
 1,000 0 0
Marshdale Elem School
 920 1 0
Elk Creek Elem School
 600 0 0
Conifer WA
 550 0 0
Conifer MD
 525 2 0
Geneva Glen Camp
 513 0 0
Granite Lake
 506 0 0
Ramah in the Rockies
 405 1 0
Mother Cabrini Shrine
 389 2 1
Pine Country Store
 380 0 0
Aspen Park Village Ctr
 360 1 0
Fort LLC the
 320 0 0
Evergreen Lutheran Church
 306 0 0
Lds Evergreen
Evergreen 		254 0 0
Twisted Pine Girl Scout Camp
 216 0 0
Bucksnort Saloon
 200 3 0
Planned Pethood International
 178 0 0
MT Evans Outdoor Lab
 172 1 0
National Laboratory of the Rockies
 168 0 0
Green Valley Center
 164 0 0
Windy Peaks Outdoor Laboratory
 164 1 0
Blackbird Cafe and Tavern
 162 0 0
Conifer Community Church
 158 1 0
Coal Creek Elementary
 150 0 0
Woodlands Colorado LLC
 119 0 0
Lone Rock CG
 108 1 1
Lost Valley Ranch Corp
 106 1 0
Peak Art Holdings LLC
 106 0 0
Kelsey CG
 102 0 0
Montessori School of Evergreen
 100 0 0
Sun Mart 502 Store and Lounge
 100 1 0
Evergreen South
 80 0 0
Montessori Middle School
 75 0 0
West Ranch Center
 75 1 0
Yellow Barn Limited
 75 0 0
Crossroads Restaurant
 65 1 0
Green Valley Center 2
 63 0 0
Zokas Restaurant
 61 0 0
Conifer Medical Center
 60 0 0
Goose Creek CG
 60 0 0
Ripple Soft Ice Cream
 58 1 0
Conifer Bend LLC
 57 0 0
Long Scraggy Ranch
 57 0 0
Marshdale General Store
 53 0 0
Willow Ridge Manor
 52 1 0
Aspen Park Terrace
 50 0 0
King Soopers 087 Fuel
 50 0 0
285 Business Park
 46 0 0
Chapel in the Hills
 40 0 0
Canyon Shoppes the
 36 0 0
Conifer Dental Medical Group
 34 1 0
Bears Inn Bed and Breakfast
 32 1 0
KB Gas and Food LLC
 31 1 0
Twins Inn INC
 31 2 0
Bear Creek Cabins
 30 0 0
Conifer Community Park at Beaver Ranch
 28 2 1
Trumbull Town of
 28 0 0
Aspen Park Community Center
 27 3 0
Windy Point Retail Center
 25 0 0
Inactive systems (175, no longer operating or reporting)

Kept for the record and excluded from the county totals above. Browse inactive systems.

About this data

Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.

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.