County · Iowa
Johnson County, Iowa: drinking water records
This overview covers 13 ZIP codes and 74 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 |
|---|---|---|---|---|---|
| University Water System IA5225101 | 26,684 | 120 | 0 | 2 | 0 ppb |
| Iowa City Water Department IA5225079 | 68,753 | 95 | 0 | 0 | 4 ppb |
| North Liberty Water Supply IA5252072 | 23,276 | 60 | 0 | 0 | 0 ppb |
| Coralville Muni Water System IA5208071 | 22,318 | 60 | 0 | 0 | 3 ppb |
| Sunrise Village Mobile Home Pk IA5200602 | 340 | 0 | 0 | 2 | 0 ppb |
| Iowa City MHP LLC IA5200601 | 280 | 60 | 0 | 0 | 0 ppb |
| Iowa City Regency Mobile Home Community IA5225673 | 225 | 0 | 0 | 2 | 2 ppb |
| Royal Oaks Subdivision IA5282303 | 163 | 0 | 0 | 1 | 0 ppb |
| Corridor Ridge Subdivision IA5280303 | 108 | 0 | 0 | 4 | 3 ppb |
| Oak Ridge Lake Estates IA5225302 | 88 | 0 | 0 | 3 | 1 ppb |
| Lindsey Estates IA5285301 | 62 | 0 | 0 | 1 | 0 ppb |
| Kesslers Homeowners Assn IA5200802 | 60 | 0 | 0 | 6 | 2 ppb |
| Gallery Acres West IA5282306 | 43 | 0 | 0 | 21 | 0 ppb |
| Mcbride Pointe Third Master Maintenance IA5282311 | 25 | 0 | 0 | 31 | 0 ppb |
| Tiffin Water Supply IA5288021 | 7,577 | 0 | 0 | 0 | 0 ppb |
| Solon Water Dept IA5282062 | 3,018 | 0 | 0 | 0 | 7 ppb |
| Lone Tree Muni Water System IA5240095 | 1,357 | 0 | 0 | 0 | 2 ppb |
| Lake Ridge, Incorporated IA5225315 | 1,300 | 0 | 0 | 0 | 0 ppb |
| Modern Manor, INC IA5225601 | 915 | 0 | 0 | 0 | 1 ppb |
| Hills Water Supply IA5221001 | 863 | 0 | 0 | 0 | 2 ppb |
| Western Hills (Mobile) Estates IA5208600 | 760 | 0 | 0 | 0 | 0 ppb |
| Oxford Water Supply IA5260017 | 722 | 0 | 0 | 0 | 9 ppb |
| River Heights Property Owners Assoc. IA5200318 | 390 | 0 | 0 | 0 | 0 ppb |
| Coralville Lake Terrace IA5200817 | 340 | 0 | 0 | 0 | 3 ppb |
| Lake Crest Manor HOA #3 IA5200891 | 300 | 0 | 0 | 0 | 2 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.