County · Wisconsin
Sauk County, Wisconsin: drinking water records
This overview covers 14 ZIP codes and 23 community water systems in Sauk 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 |
|---|---|---|---|---|---|
| Prairie Du Sac Waterworks WI1570100 | 4,006 | 120 | 0 | 1 | 1.4 ppb |
| Baraboo Waterworks WI1570085 | 12,703 | 300 | 0 | 0 | 8.1 ppb |
| Reedsburg Waterworks WI1570102 | 9,984 | 300 | 1 | 0 | 0 ppb |
| Sauk City Waterworks WI1570105 | 3,518 | 120 | 0 | 0 | 6.4 ppb |
| Plain Waterworks WI1570098 | 792 | 0 | 0 | 1 | 2.7 ppb |
| Bluffview Sanitary District WI1570097 | 450 | 0 | 0 | 1 | 0.5 ppb |
| Merrimac Waterworks WI1570093 | 440 | 0 | 0 | 2 | 1.1 ppb |
| La Valle Waterworks WI1570113 | 365 | 0 | 0 | 6 | 1.8 ppb |
| Rock Springs Waterworks WI1570104 | 292 | 0 | 0 | 2 | 0.8 ppb |
| Ironton Waterworks WI1570849 | 253 | 0 | 0 | 2 | 0 ppb |
| Maple Park Condominiums WI1570099 | 150 | 0 | 0 | 1 | 0 ppb |
| Spring Green Estates South WI1571282 | 40 | 0 | 0 | 1 | 0.1 ppb |
| Lake Delton Waterworks WI1570664 | 2,914 | 0 | 0 | 0 | 1.1 ppb |
| Spring Green Waterworks WI1570109 | 1,626 | 0 | 0 | 0 | 3.7 ppb |
| West Baraboo Waterworks WI1570112 | 1,414 | 0 | 0 | 0 | 0.7 ppb |
| North Freedom Waterworks WI1570096 | 589 | 0 | 0 | 0 | 2.4 ppb |
| Loganville Waterworks WI1570092 | 300 | 0 | 0 | 0 | 1.0 ppb |
| Spring Green Estates WI1570110 | 300 | 0 | 0 | 0 | 1.2 ppb |
| Glacier View Subdivision WI1570924 | 75 | 0 | 0 | 0 | 0 ppb |
| Summer Oaks Condo Assoc WI1570748 | 70 | 0 | 0 | 0 | 0 ppb |
| Dell Creek Estates WI1571232 | 50 | 0 | 0 | 0 | 0.3 ppb |
| Merrimac Estates MHP WI1570094 | 37 | 0 | 0 | 0 | 0.5 ppb |
| Spring Green Estates North WI1571284 | 32 | 0 | 0 | 0 | 0.7 ppb |
ZIP reports in Sauk 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: 53937, 53940, 53942.
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.