County · Kansas
Jefferson County, Kansas: drinking water records
This overview covers 9 ZIP codes and 18 community water systems in Jefferson 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 |
|---|---|---|---|---|---|
| Jefferson Co Rwd 12 KS2008717 | 3,635 | 180 | 0 | 0 | 3.4 ppb |
| Jefferson Co Rwd 3 KS2008708 | 2,435 | 0 | 0 | 4 | 1.4 ppb |
| Valley Falls, City of KS2008710 | 1,086 | 0 | 0 | 1 | 4.1 ppb |
| Mclouth, City of KS2008702 | 858 | 0 | 0 | 1 | 0 ppb |
| Perry, City of KS2008720 | 858 | 60 | 0 | 0 | 3.9 ppb |
| Jefferson Co Rwd 15 KS2008721 | 563 | 0 | 0 | 2 | 0 ppb |
| Jefferson Co Rwd 11 KS2008712 | 483 | 0 | 0 | 1 | 0 ppb |
| Lakeside Village Improvement Dist KS2008716 | 343 | 0 | 0 | 2 | 2 ppb |
| Jefferson Co Rwd 1 KS2008706 | 2,343 | 0 | 0 | 0 | 1.7 ppb |
| Jefferson Co Rwd 13 KS2008704 | 2,115 | 0 | 0 | 0 | 0.1 ppb |
| Jefferson Co Rwd 7 KS2008713 | 1,180 | 0 | 0 | 0 | 0 ppb |
| Oskaloosa, City of KS2008714 | 1,086 | 0 | 0 | 0 | 1.8 ppb |
| Jefferson Co Rwd 2 KS2008719 | 642 | 0 | 0 | 0 | 2.9 ppb |
| Ozawkie, City of KS2008718 | 636 | 0 | 0 | 0 | 1.7 ppb |
| Nortonville, City of KS2008703 | 599 | 0 | 0 | 0 | 0 ppb |
| Winchester, City of KS2008701 | 450 | 0 | 0 | 0 | 2.1 ppb |
| Jefferson Co Rwd 9 KS2008715 | 352 | 0 | 0 | 0 | 0.7 ppb |
| Jefferson Co Rwd 10 KS2008709 | 300 | 0 | 0 | 0 | 5 ppb |
ZIP reports in Jefferson 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.