Sequoyah, OK
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 Sequoyah in Oklahoma · Population: 39,676
TRI sites such as Ok Foods - Muldrow; U.S. Lime Co St Clair; Sheng Long Power Train; SDWIS systems such as SEQUOYAH CO. RWD #8; SALLISAW; MULDROW PWA anchor Sequoyah, OK's EPA extract. Derived burden score 30/100 (Moderate 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 Sequoyah include SEQUOYAH CO. RWD #8; SALLISAW; MULDROW PWA, while Ok Foods - Muldrow leads reported TRI pounds among local Form R filers. AQS median AQI 44 / peak 97 in 2024.
Burden score 30/100 (Moderate 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 Sequoyah -- 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 Sequoyah, OK: EPA TRI 2023 reporting year
Same facilities, both years
-33.9%
4 facilities that filed in 2022 and 2023
Whole inventory
-33.9%
422 lb → 279 lb, every facility that filed
- Sequoyah, OK's total reported releases fell from 422 lb in 2022 to 279 lb in 2023, based on EPA TRI filings.
- Sequoyah, OK's land releases fell from 143 lb in 2022 to 61 lb in 2023, based on EPA TRI filings.
- Sequoyah, OK's air releases fell from 273 lb in 2022 to 218 lb in 2023, based on EPA TRI filings.
- Sequoyah, OK's chemicals reported fell from 10 in 2022 to 9 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 | 252 (69%) | 114 | 0 | 97 |
| 2023 | 227 (62%) | 138 | 0 | 84 |
| 2022 | 278 (76%) | 84 | 2 | 122 |
| 2021 | 250 (69%) | 108 | 2 | 122 |
| 2020 | 304 (84%) | 57 | 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 Oklahoma, see the EPA's AirNow.gov.
Water Systems (14)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| SEQUOYAH CO. RWD #8 | 13,460 | 5 |
| SALLISAW | 8,510 | 6 |
| MULDROW PWA | 3,104 | 28 |
| SEQUOYAH CO. RWD #7 | 2,948 | 4 |
| ROLAND | 2,842 | 2 |
| SEQUOYAH CO. RWD #4 | 1,750 | 4 |
| GORE PWA | 1,688 | 45 |
| VIAN | 1,445 | 7 |
| SEQUOYAH CO. RWD #5 | 1,075 | 1 |
| SEQUOYAH CO. RWD #3 | 1,040 | 5 |
| GANS UTILITY AUTHORITY | 600 | 5 |
| SEQUOYAH CO. RWD #5 | 250 | 2 |
| LEE CREEK RWD | 250 | 3 |
| CANOE MOUNTAIN WATER SYSTEM | 26 | 5 |
TRI Facilities (4)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Ok Foods - Muldrow | 2.4K lbs |
| 2 | U.S. Lime Co St Clair | 486 lbs |
| 3 | Sheng Long Power Train | 0 lbs |
| 4 | Aviagen Feed Processing Unit | 0 lbs |
Cities in Sequoyah (7)
Frequently Asked Questions
What is the environmental risk level in Sequoyah, Oklahoma? ▼
Are there Superfund sites in Sequoyah? ▼
How many toxic release facilities are in Sequoyah? ▼
What is the air quality in Sequoyah? ▼
Is the drinking water safe in Sequoyah? ▼
What environmental agencies cover Sequoyah? ▼
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.