COUNTY WATER-SYSTEM LEDGER
Johnson, Iowa
EPA’s September 2026 export lists 6 active community water systems serving Johnson, Iowa, with 0 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 Johnson, Iowa
EPA associates 6 covered systems with Johnson, Iowa; their reported population-served values total 151,626 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 |
|---|---|---|---|
| Iowa City Water DepartmentIA5225079 | 68,753 | Surface water | No current violation flagged |
| University Water SystemIA5225101 | 26,684 | Surface water | No current violation flagged |
| North Liberty Water SupplyIA5252072 | 23,276 | Ground water | No current violation flagged |
| Coralville Muni Water SystemIA5208071 | 22,318 | Ground water | No current violation flagged |
| Tiffin Water SupplyIA5288021 | 7,577 | Ground water | No current violation flagged |
| Solon Water DeptIA5282062 | 3,018 | Ground water | No current violation flagged |
02 / SOURCE MIX
Primary water sources for Johnson, Iowa
EPA classifies 6 systems serving Johnson, Iowa across 2 primary-source categories; Surface water is the largest category with 2 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.