County · Wisconsin
Oneida County, Wisconsin: drinking water records
This overview covers 8 ZIP codes and 8 community water systems in Oneida 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 |
|---|---|---|---|---|---|
| Rhinelander Water & Wastewater WI7440126 | 8,234 | 120 | 4 | 1 | 1 ppb |
| Lakeland Sanitary Dist 1 WI7440116 | 2,381 | 0 | 0 | 1 | 2.2 ppb |
| Three Lakes Sanitary District WI7440129 | 500 | 0 | 0 | 2 | 11.2 ppb |
| Northernaire Sanitary District WI7440812 | 315 | 0 | 0 | 1 | 2.5 ppb |
| Mcnaughton Correctional Center WI7440115 | 133 | 0 | 0 | 0 | 0 ppb |
| Patricia Lake Manufactured Housing Community WI7440139 | 56 | 0 | 0 | 0 | 1.2 ppb |
| Fishermans Paradise MHP WI7440609 | 54 | 0 | 0 | 0 | 3.1 ppb |
| Rockwood Estates WI7440144 | 48 | 0 | 0 | 0 | 1.4 ppb |
ZIP reports in Oneida 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: 54463, 54531, 54564.
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.