How many water violations are in Dunn County?

Dunn County has 3,619 total drinking water violations across 85 water systems, of which 557 are health-based violations. 75.3% of systems have at least one violation.

How many people get water from Dunn County systems?

Water systems in Dunn County serve approximately 26,162 people through 85 public water systems.

Has PFAS been detected in Dunn County water?

Under EPA UCMR5, 0 of 1 tested systems in Dunn County had at least one PFAS detection (0.0% of the UCMR5-tested subset - not of all 85 SDWIS systems).

What types of water sources supply Dunn County?

Water systems in Dunn County use GW (85 systems) as their primary water sources.

Are health-based violations serious?

Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 15.4% of Dunn County's violations are health-based. Among counties with any SDWIS violations, this extract puts Dunn County in the middle health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

Where does Dunn County sit among U.S. counties for water-system population?

According to EPA SDWIS county population served used on /counties, Dunn County ranks #1,506 of 3,254 counties by people served, and #39 of 71 counties in Wisconsin. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Wisconsin

Dunn County, Wisconsin

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet WI033 · Dunn County 85 sys · 3,619 viol · #1506/3254

VIOL-SEVERE · HEALTH-LOW · RANK-MID · PHOTO-FINISH · PFAS-CLEAN · SRC-GW · SYS-MID · BOOK-FULL

VIOL-SEVERE 75.3% flagged
HEALTH-LOW 15.4% health
RANK-MID #1506/3254
PHOTO-FINISH ±0.4 pp
PFAS-CLEAN 0.0% detect
SRC-GW GW lead 100%
SYS-MID 85 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Buffalo County (+ 0.4 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Dunn County ranks #1,506 of 3,254 counties by people served, and #39 of 71 counties in Wisconsin. See methodology · corpus placement.

Dunn County standing, lower-flagged corpus third

Flagged-system rate 75.3% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 15.4% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #1,506 of 3,254 · #39 of 71 in Wisconsin.

Water Systems

System Name	Population	Violations	PFAS
Menomonie Waterworks	15,950	468	Clean
Colfax Waterworks	1,102	17	-
Boyceville Waterworks	1,043	58	-
Elk Mound Waterworks	895	11	-
Birch Terrace Mobile Home Community	700	14	-
Knapp Waterworks	486	82	-
Synergy Cooperative - Ridgeland	475	35	-
Rock Falls Raceway Main Bldg	410	15	-
Wheeler Waterworks Assoc	317	288	-
Buttons Bakery & Boutique	301	0	-
Rock Falls Raceway North Concessions	300	2	-
Downsville Sanitary District	250	38	-
Kyotes Den	250	3	-
Synergy Cooperative - Sand Creek	175	4	-
St Henry's Catholic Church	151	8	-
Marell Country Estates	150	37	-
Synergy Cooperative Hardware - Ridgeland	150	0	-
Pinewood Golf Course	150	0	-
Vino Cappuccino Artisan Bistro	105	0	-
Elk Mound Village Park Pavilion	100	0	-
Grain Bin Butchery & Market, LLC The	100	0	-
Sportsmens Bar & Grill	100	2	-
Dairyland Cafe	100	0	-
Little Elk Creek Lutheran Church	100	12	-
Cedar Falls Acres MHP	95	372	-
Tainter Woods Condominiums	85	104	-
Rock Creek Lutheran Church	60	23	-
Elk Point Resort Tavern	60	3	-
River Villa Mobile Home Court	60	53	-
Faith Evangelical Free Church	50	0	-
Countryside Mobile Homes	50	213	-
Hmong Menomonie Alliance Church	50	422	-
Twin Springs Campground LLC	50	30	-
Tainter United Methodist Church	50	3	-
Grandpa Joes Trailside	50	0	-
Pioneer Grill & Saloon	50	9	-
Birds Place LLC	50	3	-
Backwoods Bar	50	3	-
Blind Spot The	50	3	-
Little Midway Inc	50	0	-
Tanglewood Greens LLC	50	3	-
Myron Park	50	11	-
Skate Ranch The	50	5	-
Nedland Industries	45	21	-
West Akers Lutheran Church	45	3	-
Jeremiahs Bullfrog Fish Farm	40	22	-
New Hope Lutheran Church-Sand Creek	40	44	-
Shady Oaks MHP	40	825	-
Seventh Day Adventist Church	40	0	-
Barum Lutheran Church	40	8	-

Compare beyond Wisconsin

Lower-flagged peers for Dunn County

Cross-state counties nearest Dunn County on flagged-system share (75.3%) and cumulative violation count (3,619). 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

Compiled by PlainWater, Drinking Water Quality Editorial Process · May 15, 2026

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.