County · Missouri
Johnson County, Missouri: drinking water records
This overview covers 8 ZIP codes and 17 community water systems in Johnson 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 |
|---|---|---|---|---|---|
| Laf Jo Saline County Cons Pwsd 2 MO1024326 | 7,180 | 600 | 1 | 10 | 1.5 ppb |
| Mo American Warrensburg MO1010833 | 18,500 | 60 | 0 | 0 | 0 ppb |
| Johnson County Pwsd 2 MO1024310 | 12,490 | 60 | 0 | 0 | 1.9 ppb |
| Whiteman Air Base MO1079501 | 10,106 | 60 | 0 | 0 | 0 ppb |
| Johnson County Pwsd 3 MO1024311 | 4,700 | 120 | 0 | 0 | 0 ppb |
| Johnson County Pwsd 1 MO1024309 | 3,730 | 60 | 0 | 0 | 0 ppb |
| Pettis/Johnson/Saline Pwsd 1 MO3021332 | 1,000 | 0 | 0 | 9 | 1.2 ppb |
| Knob Noster PWS MO1010432 | 2,863 | 0 | 0 | 0 | 2.3 ppb |
| Holden PWS MO1010371 | 2,683 | 0 | 0 | 0 | 0 ppb |
| Leeton PWS MO1010460 | 601 | 0 | 0 | 0 | 1.7 ppb |
| Chilhowee PWS MO1010161 | 382 | 0 | 0 | 0 | 0.9 ppb |
| Kingsville PWS MO1010427 | 345 | 0 | 0 | 0 | 0.5 ppb |
| Mo American East Warrensburg MO1036387 | 335 | 0 | 0 | 0 | 0 ppb |
| Centerview PWS MO1010150 | 272 | 0 | 0 | 0 | 0.6 ppb |
| Fairfield Estates Mobile Home Park IA5131302 | 140 | 0 | 0 | 0 | 0 ppb |
| Country Acres Subd MO1036167 | 130 | 0 | 0 | 0 | 0 ppb |
| Confluence Rivers M & M MHP WTP MO1041228 | 100 | 0 | 0 | 0 | 1.5 ppb |
ZIP reports in Johnson 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.