County · Wisconsin
Grant County, Wisconsin: drinking water records
This overview covers 21 ZIP codes and 28 community water systems in Grant County. It also stands in for 3 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Platteville Waterworks WI1220115 | 12,268 | 180 | 0 | 0 | 10.3 ppb |
| Lancaster Waterworks WI1220107 | 3,907 | 180 | 0 | 0 | 1.8 ppb |
| Cuba City Waterworks WI1220092 | 2,141 | 0 | 0 | 1 | 0 ppb |
| Hazel Green Waterworks WI1220102 | 1,193 | 0 | 0 | 2 | 2.8 ppb |
| Cassville Waterworks WI1220091 | 777 | 0 | 0 | 1 | 15.1 ppb |
| Montfort Waterworks WI1220110 | 718 | 0 | 0 | 2 | 1.1 ppb |
| Potosi Waterworks WI1220117 | 718 | 0 | 0 | 2 | 1.7 ppb |
| Bloomington Waterworks WI1220085 | 682 | 60 | 0 | 0 | 1.2 ppb |
| Kieler Sd No 1 WI1220103 | 560 | 0 | 0 | 1 | 0 ppb |
| Tennyson Waterworks WI1220120 | 367 | 0 | 0 | 2 | 3.8 ppb |
| Bagley Waterworks WI1220084 | 353 | 0 | 0 | 1 | 3.8 ppb |
| Mount Hope Waterworks WI1220111 | 181 | 0 | 0 | 1 | 1.5 ppb |
| Stitzer Sanitary Dist 1 WI1220047 | 150 | 0 | 0 | 2 | 0 ppb |
| Maryville Sd 2 WI1220105 | 100 | 0 | 0 | 1 | 0.7 ppb |
| Oak Park Community WI1220095 | 90 | 0 | 0 | 2 | 1.3 ppb |
| Bluffside Court WI1220090 | 40 | 0 | 0 | 1 | 1.0 ppb |
| Stateline Mobile Home Park WI1220100 | 37 | 0 | 0 | 2 | 0 ppb |
| Boscobel Waterworks WI1220089 | 3,237 | 0 | 0 | 0 | 1.1 ppb |
| Fennimore Waterworks WI1220096 | 2,507 | 0 | 0 | 0 | 1.6 ppb |
| Muscoda Waterworks WI1220112 | 1,453 | 0 | 0 | 0 | 2.6 ppb |
| Dickeyville Waterworks WI1220094 | 1,069 | 0 | 0 | 0 | 0 ppb |
| Livingston Waterworks WI1220109 | 664 | 0 | 0 | 0 | 0.9 ppb |
| Blue River Waterworks WI1220087 | 424 | 0 | 0 | 0 | 0 ppb |
| Sinsinawa Dominicans INC WI1220118 | 213 | 0 | 0 | 0 | 0 ppb |
| Patch Grove Waterworks WI1220113 | 160 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Grant County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 53802, 53810, 53827.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.