Tapcensus

Iowa

Dubuque County drinking water quality

74 active public water systems serve 92,880 people in Dubuque County. 44 are compliant, 30 had at least one EPA violation in the past three years, 0 are designated serious violators, and 1 carries a health flag.

Active systems 74 32 community systems
People served 93K by public water systems
Systems with violations 30 41% of active systems, past 3 years
Serious violators 0 1 systems carry a health flag

Needs attention

Rolling Knolls Golf Course IA3130886 · Dyersville · Transient non-community system · Serves 118 2 rules violated in the past three years. Unresolved: Revised Total Coliform Rule (RTCR).

Community water systems

32 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
Dubuque Water Works
Dubuque 		59,667 0 0
Asbury Municipal Water System
Asbury 		5,943 0 0
Dyersville Municipal Water CO
Dyersville 		4,477 1 0
Cascade Municipal Water Supply
Cascade 		2,386 0 0
Peosta Water Supply
Peosta 		2,278 0 0
Epworth Water Supply
Epworth 		2,023 0 0
Farley Water Supply
Farley 		1,766 1 0
Alpine Park
Dubuque 		932 0 0
Terrace Heights
Dubuque 		548 1 0
Table Mound Park
Dubuque 		455 1 0
New Vienna Water Supply
New Vienna 		382 1 0
Worthington Water Supply
Worthington 		382 0 0
Holy Cross Water Supply
Holy Cross 		356 2 0
Burds Green Acres Subdivision
Peosta 		312 0 0
Thunder Hills Home & Utility Assoc.
Peosta 		300 0 0
Luxemburg Water Supply
Luxemburg 		245 0 0
Super 20 Mobile Home Court
Dubuque 		236 2 0
Spring Valley Park
Bellevue 		180 0 0
Hickory Acres
Dubuque 		115 0 0
Bernard Water System
Bernard 		114 0 0
Star Water
Dubuque 		110 1 0
Lost Canyon MHP (peosta)
Peosta 		97 1 0
Quality Water, Inc. #2 (k-L)
Dubuque 		70 3 0
Lore Mound Mobile Home Park
Dubuque 		68 0 0
Lore Oaks Homeowners Assn.
Dubuque 		64 0 0
Gavin Estates
Dubuque 		52 4 2
North End Mobile Home Park
Dubuque 		40 4 0
Country Hills Water Corp
Centralia 		38 0 0
Shagbark Estates
Dubuque 		38 3 1
Green Brier Subdivision
Dubuque 		35 2 0
Regency West Subdivision
Dubuque 		34 0 0
Ace Mobile Home Park
Dubuque 		32 0 0
Non-community systems (42: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
John Deere Dubuque Works
Dubuque 		3,000 0 0
311 Fuel & Food LLC
Peosta 		912 0 0
Sun Down Ski Resort
Dubuque 		685 0 0
Dubuque Sports Complex
Dubuque 		400 3 0
Swiss Valley Nature Center
Dubuque 		363 0 0
Sageville Elementary School
Sageville 		310 1 1
Fillmore Recreation Area
Cascade 		264 0 0
MUD Lake Park
Dubuque 		257 0 0
Derby Grange Golf INC
Dubuque 		200 1 0
Saint Peter & Paul Parish Sherril
Sherrill 		200 1 1
Swiss Valley Park
Dubuque 		183 0 0
Town Clock
Centralia 		158 3 0
Breitbach Country Dining
Sherrill 		150 1 0
Bankston Public Water System
Bankston 		145 0 0
Timberline Golf Course Inc.
Peosta 		130 3 1
Rolling Knolls Golf Course
Dyersville 		118 2 1
New Wine Park
New Vienna 		105 0 0
Heritage Trail
Dubuque 		100 0 0
Massey Marina
Dubuque 		100 0 0
Tri-State Community Church
Dubuque 		100 2 1
Corporation of New Melleray
Dubuque 		89 1 0
Dubuque Shooting Society
Dubuque 		85 0 0
Rhodys
Dubuque 		84 0 0
Riverview Ridge Campgrounds
Cascade 		80 0 0
Camp Granada
Dubuque 		76 0 0
Offside Bar & Grill
Dubuque 		75 0 0
The Barn (sherrill)
Sherrill 		64 0 0
Dubuque YMCA Camp
Dubuque 		60 0 0
Elk Lodge # 297
Dubuque 		56 0 0
Camp Little Cloud
Epworth 		55 1 0
Fillmore Bar and Grill
Cascade 		55 0 0
Mid-Mart, Inc.
Holy Cross 		51 2 1
Mile 600 LLC
Sherrill 		50 0 0
Scherrmanns Implement and Appliance INC
Dyersville 		48 0 0
Finleys Landing
Dubuque 		46 0 0
Creek Valley Campground
Dubuque 		45 1 0
ST Francis Catholic Church
Sherrill 		42 0 0
Dyersville Golf and Country Club
Dyersville 		40 1 0
Mines of Spain EB Lyons Nature Center
Dubuque 		35 0 0
Durango Depot
Durango 		32 1 0
Dutrac Comm Credit Union (peru Rd)
Dubuque 		30 0 0
Albrecht Acres
Sherrill 		27 2 0
Inactive systems (145, 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 Iowa 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.