Jefferson, MO
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against every other tracked county rather than against fixed national thresholds.
Environmental data for Jefferson in Missouri · Population: 228,227
Jefferson, MO is tracked across three EPA datasets covering 12 Toxics Release Inventory (TRI) facilities, 47 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 52/100 (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 5.9M lbs of reported toxic releases under EPCRA Section 313, while 11 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 40 and a peak AQI of 105 in 2024, with 81% 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 | 292 (81%) | 67 | 1 | 105 |
| 2023 | 225 (62%) | 121 | 14 | 185 |
| 2022 | 236 (66%) | 121 | 3 | 108 |
| 2021 | 244 (67%) | 116 | 4 | 164 |
| 2020 | 250 (68%) | 113 | 2 | 141 |
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 Missouri, see the EPA's AirNow.gov.
Water Systems (47)
| System | Population | Violations |
|---|---|---|
| JEFFERSON CO CONS PWSD C 1 | 37,000 | 0 |
| JEFFERSON COUNTY PWSD 1 | 21,113 | 0 |
| JEFFERSON COUNTY PWSD 3 | 17,000 | 0 |
| FESTUS PWS | 12,054 | 0 |
| JEFFERSON COUNTY PWSD 10 | 10,000 | 0 |
| JEFFERSON COUNTY PWSD 5 | 8,000 | 0 |
| JEFFERSON COUNTY PWSD 6 | 7,500 | 0 |
| DESOTO PWS | 6,400 | 0 |
| JEFFERSON COUNTY PWSD 7 | 6,100 | 0 |
| PEVELY PWS | 5,600 | 0 |
| CRYSTAL CITY PWS | 4,733 | 10 |
| JEFFERSON CO PWSD 8 | 4,733 | 0 |
| HERCULANEUM PWS | 4,227 | 0 |
| HILLSBORO PWS | 3,000 | 1 |
| JEFFERSON COUNTY PWSD 12 | 3,000 | 0 |
| RAINTREE PLANTATION | 2,200 | 0 |
| MIRASOL SUBDIVISION | 2,012 | 0 |
| JCPSD SUMMER SET | 1,080 | 3 |
| VALLE LAKE SUBD | 625 | 0 |
| SUNRISE LAKES SUBD | 400 | 1 |
| LAKE ADELLE SUBD | 380 | 0 |
| QUAIL RUN OF IMPERIAL | 370 | 1 |
| STARLING MHP | 342 | 0 |
| SEGES MHP | 285 | 0 |
| ANTIRE VALLEY SUBD | 260 | 3 |
| HUNTERS GLEN | 240 | 0 |
| LAKE LORRAINE WATER CO | 230 | 0 |
| OZARK HILLS MHP | 230 | 0 |
| BRIARWOOD UTILITIES | 210 | 0 |
| SYCAMORE SPRINGS | 200 | 0 |
| LAKESIDE MANOR | 150 | 0 |
| FRONTIER ESTATES | 120 | 7 |
| WARE LAKE SUBD | 100 | 0 |
| MANDERLY MHP | 100 | 0 |
| BAISCH NURSING CENTER | 80 | 0 |
| LAKEHURST MHP | 70 | 0 |
| HOUSE SPRINGS APT | 48 | 0 |
| MEADOW DRIVE SUBD | 42 | 0 |
| CRYSTAL COVE MHP | 40 | 0 |
| WALKER HILL MHP | 30 | 1 |
| COUNTRY AIRE ESTATES | 30 | 1 |
| LYNN ACRES MHP | 27 | 0 |
| EAGLES LANDING SUBDIVISION ASSOCIATION | 25 | 0 |
| FICKEN HILL SUBD | 25 | 5 |
| JEFFERSON COUNTY WATER AUTHORITY | 25 | 0 |
| BIG VALLEY COURT | 23 | 2 |
| VALLE ACRES MHP | 11 | 0 |
TRI Facilities (12)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Doe Run Co Herculaneum Smelter | 3.8M lbs |
| 2 | Metal Container Corp - Arnold Can Plant | 1.1M lbs |
| 3 | Ameren Missouri Rush Island Energy Center | 625.0K lbs |
| 4 | H-J Enterprises Inc | 180.5K lbs |
| 5 | Ardagh Glass Inc | 115.8K lbs |
| 6 | River Cement Co (dba Buzzi Unicem Usa) | 105.6K lbs |
| 7 | Superior Industrial Solutions Inc. | 41.7K lbs |
| 8 | Masterchem Industries (behr LLC -- St Louis) | 10.2K lbs |
| 9 | Carondelet Foundry Corp | 5.7K lbs |
| 10 | Pvs Dx Inc. | 740 lbs |
| 11 | Engineered Coil Co. DBA Drs Marlo Coil | 230 lbs |
| 12 | Ddp Specialty Electronic Materials US LLC | 0 lbs |
Cities in Jefferson (7)
Frequently Asked Questions
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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.