County · Kansas
Washington County, Kansas: drinking water records
This overview covers 11 ZIP codes and 12 community water systems in Washington 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 |
|---|---|---|---|---|---|
| Greenleaf, City of KS2020106 | 347 | 0 | 0 | 4 | 0 ppb |
| Mahaska, City of KS2020102 | 44 | 0 | 0 | 1 | 0 ppb |
| Washington Co Rwd 1 KS2020107 | 1,093 | 0 | 0 | 0 | 0 ppb |
| Washington, City of KS2020101 | 1,065 | 0 | 0 | 0 | 0 ppb |
| Hanover, City of KS2020108 | 689 | 0 | 0 | 0 | 2.2 ppb |
| Washington Co Rwd 2 KS2020113 | 673 | 0 | 0 | 0 | 1.5 ppb |
| Clifton, City of KS2002709 | 455 | 0 | 0 | 0 | 3.3 ppb |
| Linn, City of KS2020104 | 382 | 0 | 0 | 0 | 0.7 ppb |
| Barnes, City of KS2020110 | 161 | 0 | 0 | 0 | 2.8 ppb |
| Palmer, City of KS2020105 | 125 | 0 | 0 | 0 | 2.3 ppb |
| Morrowville, City of KS2020103 | 115 | 0 | 0 | 0 | 1.6 ppb |
| Haddam, City of KS2020109 | 109 | 0 | 0 | 0 | 5.9 ppb |
ZIP reports in Washington 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.