COUNTY WATER-SYSTEM LEDGER
Jefferson, Missouri
EPA’s September 2026 export lists 16 active community water systems serving Jefferson, Missouri, with 4 current-violation flags and 0 serious-violator flags among the covered systems.
Source: EPA SDWIS system-search export · Active community systems serving 2,500+ people · Snapshot 13 Sep 2026
01 / SYSTEMS
Water systems serving Jefferson, Missouri
EPA associates 16 covered systems with Jefferson, Missouri; their reported population-served values total 169,027 and may overlap.
Ordered by reported population served. Open any record for separate health, monitoring, notice, other, and serious-violator flags.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| Jefferson Co Cons PWSd C 1MO6024295 | 37,000 | Surface water purchased | No current violation flagged |
| Jefferson County PWSd 1MO6024292 | 21,113 | Surface water purchased | No current violation flagged |
| Jefferson County PWSd 3MO6024294 | 17,000 | Surface water purchased | No current violation flagged |
| Jefferson County PWSd 2MO6024293 | 16,548 | Surface water | No current violation flagged |
| Festus PWSMO6010276 | 13,000 | Purchased ground water under influence of surface water source | No current violation flagged |
| Jefferson County PWSd 10MO6024302 | 10,000 | Surface water purchased | No current violation flagged |
| Jefferson County PWSd 5MO6024296 | 8,000 | Ground water | Current monitoring/reporting flag |
| Jefferson County PWSd 6MO6024298 | 7,500 | Ground water | No current violation flagged |
| Desoto PWSMO6010213 | 6,400 | Ground water | No current violation flagged |
| Jefferson County PWSd 7MO6024299 | 6,100 | Ground water | No current violation flagged |
| Pevely PWSMO6010638 | 5,600 | Ground water | No current violation flagged |
| Herculaneum PWSMO6010359 | 5,000 | Purchased ground water under influence of surface water source | Current monitoring/reporting flag |
| Crystal City PWSMO6010198 | 4,733 | Ground water | Current monitoring/reporting flag |
| Jefferson Co PWSd 8MO6024300 | 4,733 | Ground water | Current monitoring/reporting flag |
| Jefferson County PWSd 12MO6024304 | 3,300 | Ground water | No current violation flagged |
| Hillsboro PWSMO6010368 | 3,000 | Ground water | No current violation flagged |
02 / SOURCE MIX
Primary water sources for Jefferson, Missouri
EPA classifies 16 systems serving Jefferson, Missouri across 4 primary-source categories; Surface water purchased is the largest category with 4 systems.
It is the sum of each listed system's reported population served, not a census estimate. Service areas can overlap and some systems list multiple cities or counties.