County · Wisconsin
Columbia County, Wisconsin: drinking water records
This overview covers 13 ZIP codes and 23 community water systems in Columbia County. It also stands in for 0 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 |
|---|---|---|---|---|---|
| Columbus Utilities WI1110038 | 5,173 | 120 | 0 | 2 | 8.9 ppb |
| Portage Waterworks WI1110039 | 10,437 | 120 | 1 | 0 | 6.2 ppb |
| Wisconsin Dells Waterworks WI1110113 | 3,232 | 0 | 0 | 1 | 1.7 ppb |
| Lodi Waterworks WI1110100 | 3,146 | 0 | 0 | 2 | 18 ppb |
| Poynette Waterworks WI1110037 | 2,520 | 0 | 0 | 1 | 3.1 ppb |
| Randolph Water Dept WI1110125 | 1,800 | 0 | 0 | 5 | 1.3 ppb |
| Fall River Waterworks WI1110098 | 1,793 | 0 | 0 | 1 | 0.9 ppb |
| Rio Waterworks WI1110111 | 1,095 | 0 | 0 | 1 | 1.4 ppb |
| Arlington Waterworks WI1110093 | 946 | 0 | 0 | 4 | 2 ppb |
| Cambria Waterworks WI1110041 | 767 | 0 | 0 | 1 | 4.2 ppb |
| Crystal Lake RV Resort LLC WI1110066 | 725 | 0 | 0 | 4 | 5.5 ppb |
| Saddle Ridge Estates WI1110123 | 700 | 0 | 0 | 1 | 3.3 ppb |
| Friesland Waterworks WI1110099 | 345 | 0 | 0 | 3 | 0 ppb |
| Dells Estates WI1111017 | 30 | 0 | 0 | 1 | 1.7 ppb |
| Pardeeville Waterworks WI1110049 | 2,151 | 0 | 0 | 0 | 1.7 ppb |
| Harmony Grove San Dist WI1110101 | 1,950 | 0 | 0 | 0 | 3.2 ppb |
| Wyocena Waterworks WI1110124 | 768 | 0 | 0 | 0 | 2.7 ppb |
| Wisconsin Academy Main Campus WI1110248 | 115 | 0 | 0 | 0 | 0 ppb |
| Suburban Heights MHP WI1110103 | 90 | 0 | 0 | 0 | 0 ppb |
| Inch Heights LLC WI1110110 | 47 | 0 | 0 | 0 | 1.1 ppb |
| Harmony Mobile Manor WI1110065 | 45 | 0 | 0 | 0 | 0.5 ppb |
| Pine Haven Estates WI1110112 | 45 | 0 | 0 | 0 | 0 ppb |
| Capital Hill Mobile Home Park WI1110107 | 36 | 0 | 0 | 0 | 4.6 ppb |
ZIP reports in Columbia County
No ZIP report in this county is published yet.
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.