PlainWater
Counties → Wisconsin

Grant County, Wisconsin

SDWIS compliance plate

Sheet WI043 · Grant County 89 sys · 3,251 viol · #1072/3254

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

  • VIOL-SEVERE 88.8% flagged
  • HEALTH-MID 23.6% health
  • RANK-UPPER #1072/3254
  • PHOTO-FINISH ±0.7 pp
  • PFAS-CLEAN 0.0% detect
  • SRC-GW GW lead 100%
  • SYS-MID 89 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Richland County (+ 0.7 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Grant County ranks #1,072 of 3,254 counties by people served, and #28 of 71 counties in Wisconsin. See methodology · corpus placement.

Grant County standing, lower-flagged corpus third

Flagged-system rate 88.8% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 23.6% 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 #1,072 of 3,254 · #28 of 71 in Wisconsin.

Flagged-rate neighbourhood around Grant County

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

0% 20% 40% 60% 80% 100% Bayfield · lowest Marinette · near Richland · near Milwaukee · highest 52.1% 84.8% 87.4% 88.8% 89.5% 91.8% 95.3%

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

Water Systems

System Name Population Violations PFAS
Platteville Waterworks 12,268 111 Clean
Lancaster Waterworks 3,868 43 Clean
Boscobel Waterworks 3,237 21 -
Fennimore Waterworks 2,507 43 -
Cuba City Waterworks 2,141 31 -
Muscoda Waterworks 1,453 123 -
Hazel Green Waterworks 1,193 52 -
Dickeyville Waterworks 1,069 100 -
WI DOT Rest Area 106 Jamestown 880 60 -
Cassville Waterworks 777 13 -
Montfort Waterworks 718 43 -
Potosi Waterworks 718 83 -
Bloomington Waterworks 682 23 Clean
Livingston Waterworks 664 119 -
WI DNR Wyalusing Central Pump House 600 25 -
Kieler SD No 1 560 19 -
Blue River Waterworks 424 35 -
Boulder Creek Campground 368 31 -
Tennyson Waterworks 367 103 -
Bagley Waterworks 353 43 -
WI Historical Stonefield Barn 303 12 -
WI Historical Stonefield Ag Museum 300 24 -
WI DNR Wyalusing Visitors Station 254 33 -
River of Lakes Riverfront Campground & Resort 250 8 -
Platteville Golf & Cntry Clb 215 21 -
Sinsinawa Dominicans Inc 213 73 -
Hickory Grove Country Club 210 67 -
Crossroads Supper Club 208 6 -
Mount Hope Waterworks 181 37 -
Boscobel Bowling & Banquet 162 0 -
Patch Grove Waterworks 160 72 -
Birchwood Golf Course Clubhouse 160 4 -
Country Heights Supper Club 153 5 -
Stitzer Sanitary Dist 1 150 28 -
St Marys Catholic Church 150 5 -
Whitetail Bluff Camp and Resort Expansion 150 4 -
Wisconsin Badger Camp 140 0 -
Three Mile House 135 21 -
Village Bar 129 31 -
WI DNR Nelson Dewey Walnut Grove Group Camp 125 14 -
Coconut Cove Resort 108 12 -
Gulers Corners 106 14 -
I Dont Care Pub & Grub 106 32 -
Whitetail Bluff Camp and Resort 103 6 -
Calvary Baptist Ch 101 16 -
Motor Boatn Bar and Grill 101 88 -
Maryville SD 2 100 45 -
St Joseph Catholic School 100 295 -
WI DNR Nelson Dewey Maple Grove Office 100 9 -
Grant River Recreation Area 100 0 -

Compare beyond Wisconsin

Lower-flagged peers for Grant County

Cross-state counties nearest Grant County on flagged-system share (88.8%) and cumulative violation count (3,251). 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.