Kansas
Jefferson County drinking water quality
18 active public water systems serve 19,964 people in Jefferson County. 7 are compliant, 11 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
18 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Jefferson CO Rwd 12 Winchester |
3,635 | 0 | 0 | |
|
Jefferson CO Rwd 3 Valley Falls |
2,435 | 0 | 0 | |
|
Jefferson CO Rwd 1 Meriden |
2,343 | 0 | 0 | |
|
Jefferson CO Rwd 13 Lawrence |
2,115 | 3 | 0 | |
|
Jefferson CO Rwd 7 Oskaloosa |
1,180 | 0 | 0 | |
|
Oskaloosa, City of Oskaloosa |
1,086 | 1 | 0 | |
|
Valley Falls, City of Valley Falls |
1,086 | 1 | 1 | |
|
McLouth, City of Mclouth |
858 | 2 | 0 | |
|
Perry, City of Perry |
858 | 2 | 1 | |
|
Jefferson CO Rwd 2 Perry |
642 | 2 | 0 | |
|
Ozawkie, City of Ozawkie |
636 | 1 | 1 | |
|
Nortonville, City of Nortonville |
599 | 0 | 0 | |
|
Jefferson CO Rwd 15 Grantville |
563 | 1 | 1 | |
|
Jefferson CO Rwd 11 Ozawkie |
483 | 0 | 0 | |
|
Winchester, City of Winchester |
450 | 1 | 0 | |
|
Jefferson CO Rwd 9 Ozawkie |
352 | 0 | 0 | |
|
Lakeside Village Improvement Dist Ozawkie |
343 | 3 | 1 | |
|
Jefferson CO Rwd 10 Ozawkie |
300 | 1 | 1 |
Inactive systems (11, 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 Kansas 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.