Missouri
Johnson County drinking water quality
16 active public water systems serve 66,549 people in Johnson County. 10 are compliant, 6 had at least one EPA violation in the past three years, 0 are designated serious violators, and 0 carry a health flag.
Community water systems
16 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
MO American Warrensburg Warrensburg |
18,500 | 0 | 0 | |
|
Johnson County Pwsd 2 Holden |
12,490 | 0 | 0 | |
|
Whiteman Air Base |
10,106 | 1 | 0 | |
|
Laf JO Saline County Cons Pwsd 2 |
7,180 | 0 | 0 | |
|
Johnson County Pwsd 3 Warrensburg |
5,317 | 0 | 0 | |
|
Johnson County Pwsd 1 Warrensburg |
4,240 | 2 | 0 | |
|
Knob Noster PWS Knob Noster |
2,863 | 0 | 0 | |
|
Holden PWS Holden |
2,683 | 0 | 0 | |
|
Pettis/johnson/saline Pwsd 1 Saline |
1,000 | 3 | 1 | |
|
Leeton PWS Leeton |
601 | 2 | 0 | |
|
Chilhowee PWS |
382 | 0 | 0 | |
|
Kingsville PWS Kingsville |
345 | 0 | 0 | |
|
MO American East Warrensburg |
335 | 0 | 0 | |
|
Centerview PWS Centerview |
277 | 1 | 0 | |
|
Country Acres Subd Knob Noster |
130 | 0 | 0 | |
|
Confluence Rivers M & M MHP Wtp |
100 | 1 | 0 |
Inactive systems (25, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Missouri records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.