Johnson, IA
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology.
Environmental data for Johnson in Iowa · Population: 154,881
Johnson, IA is tracked across three EPA datasets covering 8 Toxics Release Inventory (TRI) facilities, 70 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 41/100 (Moderate Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 539.4K lbs of reported toxic releases under EPCRA Section 313, while 12 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 39 and a peak AQI of 83 in 2024, with 71% of observed days rated "Good" (0–50).
All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.
Air Quality History (2020–2024)
EPA Air Quality Index (AQI) data showing how many days per year fall into each air quality category.
| Year | Good | Moderate | Unhealthy (SG) | Max AQI |
|---|---|---|---|---|
| 2024 | 259 (71%) | 107 | 0 | 83 |
| 2023 | 143 (39%) | 216 | 2 | 210 |
| 2022 | 223 (61%) | 141 | 1 | 108 |
| 2021 | 172 (47%) | 190 | 2 | 121 |
| 2020 | 207 (57%) | 154 | 1 | 105 |
Source: EPA Air Quality System (AQS) Annual AQI by County EPA Air Quality System (AQS) Annual AQI by County AQI categories: Good (0-50), Moderate (51-100), Unhealthy for Sensitive Groups (101-150), Unhealthy (151-200), Very Unhealthy (201-300), Hazardous (301+)
For real-time air quality readings and pollutant breakdowns in Iowa, see the EPA's AirNow.gov.
Water Systems (70)
| System | Population | Violations |
|---|---|---|
| IOWA CITY WATER DEPARTMENT | 68,753 | 0 |
| UNIVERSITY WATER SYSTEM | 26,684 | 2 |
| CORALVILLE MUNI WATER SYSTEM | 22,318 | 0 |
| NORTH LIBERTY WATER SUPPLY | 20,491 | 0 |
| TIFFIN WATER SUPPLY | 4,512 | 0 |
| SOLON WATER DEPT | 3,018 | 0 |
| KALONA WATER DEPT | 2,630 | 0 |
| HILLS WATER SUPPLY | 863 | 0 |
| OXFORD WATER SUPPLY | 722 | 0 |
| IOWA CITY REGENCY MOBILE HOME COMMUNITY | 700 | 2 |
| WEST BRANCH MHP | 400 | 0 |
| RIVER HEIGHTS PROPERTY OWNERS ASSOC. | 390 | 0 |
| PARKVIEW MOBILE HOME COURT | 300 | 0 |
| LAKE CREST MANOR HOA #3 | 300 | 0 |
| IOWA CITY MHP LLC | 280 | 0 |
| GADDIS ESTATES HOA | 220 | 0 |
| COTTAGE RESERVE CORPORATION | 198 | 1 |
| PARK PLAZA MHP LLC | 188 | 0 |
| NORTH TWIN VIEW HEIGHTS | 180 | 0 |
| IADU CLEAR MHP LLC | 173 | 0 |
| CORALVILLE LAKE MANOR | 170 | 0 |
| SPRING VALLEY HOMEOWNERS ASSN. | 163 | 0 |
| ROYAL OAKS SUBDIVISION | 163 | 1 |
| PRAIRIE VIEW ESTATES ASSOC JOHNSON CNTY | 155 | 0 |
| TWIN VIEW HEIGHTS | 155 | 0 |
| FORESTGATE SUBDIVISION | 140 | 0 |
| LAKE VISTA SUBDIVISION | 134 | 0 |
| LAKEVIEW KNOLLS HOMEOWNERS ASSN. | 122 | 0 |
| RIVERVIEW ESTATES | 108 | 0 |
| LONGVIEW ESTATES HOA (NORTH LIBERTY) | 108 | 0 |
| ROCKLYN MHP | 103 | 0 |
| TWIN VALLEY LAKES IMPROVEMENT ASSN | 100 | 0 |
| WALDENBURG COMMUNITY WATER SYSTEM | 90 | 5 |
| HIDDEN ACRES SUBDIVISION | 90 | 0 |
| MAKADA HOMEOWNERS ASSOCIATION | 85 | 0 |
| LYN-DEN HEIGHTS HOMEOWNERS ASSOC. | 84 | 0 |
| TIMBER TRAIL HOMEOWNERS ASSOCIATION | 80 | 0 |
| FAR HORIZONS SUBDIVISION | 80 | 0 |
| FISHER WELL OWNERS ASSOCIATION | 80 | 0 |
| ORCHARD VIEW ESTATES | 78 | 0 |
| ORCHARD HEIGHTS SUBDIVISION | 78 | 0 |
| RAPID CREEK RIDGE | 70 | 0 |
| BEYONDER GETAWAY AT SLEEPY HOLLOW | 70 | 0 |
| LAKE MACBRIDE HEIGHTS HOA | 69 | 0 |
| WENDRAM BLUFF HOMES WATER SYSTEM | 68 | 1 |
| WINCHESTER HEIGHTS SUBDIVISION | 67 | 0 |
| FRYTOWN WATER COOP | 67 | 0 |
| TURKEY CREEK DEVELOPMENT | 65 | 0 |
| YANKEE GROVE HOA | 64 | 4 |
| MACBRIDE ESTATES DEVELOPMENT | 63 | 0 |
| INDIAN HILLS HOME OWNERS ASSOCIATION | 62 | 0 |
| LINDSEY ESTATES | 62 | 1 |
| KESSLERS HOMEOWNERS ASSN | 60 | 7 |
| CITY OF KALONA - SOUTHTOWN | 60 | 0 |
| CHERRY HILLS SUBDIVISION | 59 | 0 |
| NORTH CORALVILLE LAKE MANOR | 55 | 0 |
| CUMBERLAND RIDGE FIRST ADDITION | 55 | 0 |
| COUNTRY VIEW SUBDIVISION HOA | 55 | 0 |
| TIMBERLAKE | 52 | 0 |
| WOODS AT HUNTER CREEK (PART 1) | 50 | 0 |
| REDWING ESTATES HOA | 48 | 0 |
| WINDY RIDGE WELL ASSOCIATION | 45 | 0 |
| SUNSET HILLS ESTATES PART 2 | 45 | 1 |
| WALDSCHMIDT SUBDIVISION | 45 | 1 |
| WOODLAND RIDGE ESTATES | 42 | 0 |
| THE MEADOWS | 35 | 0 |
| POLK AVENUE WATER ASSOCIATION | 30 | 0 |
| YANKEE GROVE PART 3 | 25 | 0 |
| CHAIN RIDGE SUBDIVISION | 25 | 0 |
| MCBRIDE POINTE THIRD MASTER MAINTENANCE | 25 | 50 |
TRI Facilities (8)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Integrated Dna Technologies | 241.1K lbs |
| 2 | Loparex LLC | 220.8K lbs |
| 3 | Procter & Gamble Hair Care LLC | 76.6K lbs |
| 4 | Hawkeye Ready Mix | 500 lbs |
| 5 | Bae Systems Information & Electronic Systems Integration I | 352 lbs |
| 6 | Rockwell Collins Inc Coralville Operations | 41 lbs |
| 7 | Hubbard Feeds Inc | 0 lbs |
| 8 | P&g Iowa City Power Oral Care | 0 lbs |
Cities in Johnson (2)
Frequently Asked Questions
What is the environmental risk level in Johnson, Iowa? ▼
Are there Superfund sites in Johnson? ▼
How many toxic release facilities are in Johnson? ▼
What is the air quality in Johnson? ▼
Is the drinking water safe in Johnson? ▼
What environmental agencies cover Johnson? ▼
What does this county environmental profile show?
This county environmental profile rolls up EPA Toxics Release Inventory facility reports, Safe Drinking Water Information System public-water-system filings, and Superfund National Priorities List sites for the county boundary defined by the U.S. Census Bureau. Facility counts reflect facilities with a reporting address inside the county, not where downstream environmental effects may be observed. Population figures are from the most recent Census ACS 5-year estimate. The county detail page is updated whenever the upstream EPA programs publish revised data; see the methodology page for the documented ingest cadence and the editorial choices governing how aggregations are computed.
Read our methodology - how this data is sourced, computed, and verified.