Jefferson, MO
Transparent derived index from EPA TRI / SDWIS / Superfund extracts: not an official EPA rating. Fixed caps: facilities ≤25 pts (50+ = max), log10 releases ≤25 pts, Superfund ≤25 pts (5/site), health-violation systems ≤15 pts (3/system), high-chemical facilities ≤10 pts. Bands: High ≥60, Moderate ≥30. See methodology. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against other tracked counties rather than against these fixed caps.
Environmental data for Jefferson in Missouri · Population: 228,227
TRI sites such as Doe Run Co Herculaneum Smelter; Metal Container Corp - Arnold Can Plant; Ameren Missouri Rush Island Energy Center; SDWIS systems such as JEFFERSON CO CONS PWSD C 1; JEFFERSON COUNTY PWSD 1; JEFFERSON COUNTY PWSD 3; NPL sites such as Minker/Stout/Romaine Creek; Southwest Jefferson County Mining anchor Jefferson, MO's EPA extract. Derived burden score 62/100 (High Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
Health-flagged SDWIS rows in Jefferson include CRYSTAL CITY PWS; HILLSBORO PWS; JCPSD SUMMER SET, while Doe Run Co Herculaneum Smelter leads reported TRI pounds among local Form R filers. AQS median AQI 40 / peak 105 in 2024.
Burden score 62/100 (High Risk) is the only weighted composite on this page. The tables below list every TRI facility, SDWIS system, and Superfund site EPA has on record for Jefferson -- not just the names called out above -- reproducing the disclosure history as filed, not a current-safety verdict. Extract current as of 2026-08-25.
Release-over-release change
What changed for Jefferson, MO: EPA TRI 2023 reporting year
Same facilities, both years
-25.7%
11 facilities that filed in 2022 and 2023
Whole inventory
-92.2%
3.8 million lb → 300.1 thousand lb, every facility that filed
Between the two reporting years, 0 facilities filed for the first time and 1 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Jefferson, MO's total reported releases fell from 403.7 thousand lb in 2022 to 300.1 thousand lb in 2023, based on EPA TRI filings.
- Jefferson, MO's water releases fell from 258 lb in 2022 to 49 lb in 2023, based on EPA TRI filings.
- Jefferson, MO's air releases fell from 358.6 thousand lb in 2022 to 248.0 thousand lb in 2023, based on EPA TRI filings.
- Jefferson, MO's off-site transfers rose from 44.9 thousand lb in 2022 to 52.1 thousand lb in 2023, based on EPA TRI filings.
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 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 (45)
| System | System pop (SDWIS) | 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 | 13,000 | 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 |
| HERCULANEUM PWS | 5,000 | 0 |
| CRYSTAL CITY PWS | 4,733 | 10 |
| JEFFERSON CO PWSD 8 | 4,733 | 0 |
| JEFFERSON COUNTY PWSD 12 | 3,300 | 0 |
| HILLSBORO PWS | 3,000 | 1 |
| RAINTREE PLANTATION | 2,200 | 0 |
| MIRASOL SUBDIVISION | 2,012 | 0 |
| JCPSD SUMMER SET | 1,080 | 3 |
| VALLE LAKE SUBD | 625 | 0 |
| SYCAMORE SPRINGS | 470 | 0 |
| LAKE ADELLE SUBD | 380 | 0 |
| QUAIL RUN OF IMPERIAL | 370 | 1 |
| STARLING MHP | 342 | 0 |
| SEGES MHP | 285 | 0 |
| ANTIRE VALLEY SUBD | 260 | 4 |
| HUNTERS GLEN | 240 | 0 |
| LAKE LORRAINE WATER CO | 230 | 0 |
| OZARK HILLS MHP | 230 | 0 |
| BRIARWOOD UTILITIES | 210 | 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 |
| 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 |
Superfund Sites (2)
| Site Name | Status | HRS Score |
|---|---|---|
| Minker/Stout/Romaine Creek | NPL Site | 36.78 |
| Southwest Jefferson County Mining | NPL Site | 70.71 |
Cities in Jefferson (15)
Frequently Asked Questions
What is the environmental risk level in Jefferson, Missouri? ▼
Are there Superfund sites in Jefferson? ▼
How many toxic release facilities are in Jefferson? ▼
What is the air quality in Jefferson? ▼
Is the drinking water safe in Jefferson? ▼
What environmental agencies cover Jefferson? ▼
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.