Union, SD
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.
Environmental data for Union in South Dakota · Population: 16,916
TRI sites such as Load King Trailers; Royal Canin USA Inc.; Alkota Cleaning Systems Inc; SDWIS systems such as DAKOTA DUNES CID; NORTH SIOUX CITY; ELK POINT anchor Union, SD's EPA extract. Derived burden score 19/100 (Low 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 Union include JEFFERSON, while Load King Trailers leads reported TRI pounds among local Form R filers. AQS median AQI 44 / peak 167 in 2021.
Burden score 19/100 (Low 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 Union -- 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 Union, SD: EPA TRI 2023 reporting year
Same facilities, both years
-95.5%
2 facilities that filed in 2022 and 2023
Whole inventory
-95.5%
266 lb → 12 lb, every facility that filed
Between the two reporting years, 1 facility filed for the first time and 0 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Union, SD's total reported releases fell from 266 lb in 2022 to 12 lb in 2023, based on EPA TRI filings.
- Union, SD's off-site transfers fell from 264 lb in 2022 to 7 lb in 2023, based on EPA TRI filings.
Air Quality History (2020–2021)
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 |
|---|---|---|---|---|
| 2021 | 179 (66%) | 90 | 2 | 167 |
| 2020 | 304 (83%) | 61 | 1 | 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 South Dakota, see the EPA's AirNow.gov.
Water Systems (5)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| DAKOTA DUNES CID | 3,700 | 0 |
| NORTH SIOUX CITY | 3,042 | 0 |
| ELK POINT | 2,124 | 0 |
| ALCESTER | 820 | 0 |
| JEFFERSON | 475 | 3 |
TRI Facilities (4)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Load King Trailers | 4.8K lbs |
| 2 | Royal Canin USA Inc. | 2.6K lbs |
| 3 | Alkota Cleaning Systems Inc | 0 lbs |
| 4 | Consumers Supply - North Sioux | 0 lbs |
Cities in Union (5)
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.