Dewey, 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 Dewey in Oklahoma · Population: 4,433
TRI sites such as Iochem Corp; SDWIS systems such as SEILING; VICI; CANTON anchor Dewey, OK's EPA extract. Derived burden score 27/100 (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 Dewey include SEILING; VICI; CANTON, while Iochem Corp leads reported TRI pounds among local Form R filers. AQS median AQI 47 / peak 112 in 2024.
Burden score 27/100 (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 Dewey -- 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 Dewey, OK: EPA TRI 2023 reporting year
Same facilities, both years
-17.6%
1 facilities that filed in 2022 and 2023
Whole inventory
-17.6%
129 lb → 106 lb, every facility that filed
- Dewey, OK's total reported releases fell from 129 lb in 2022 to 106 lb in 2023, based on EPA TRI filings.
- Dewey, OK's air releases fell from 129 lb in 2022 to 106 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 | 221 (60%) | 139 | 6 | 112 |
| 2023 | 221 (61%) | 144 | 0 | 100 |
| 2022 | 219 (63%) | 124 | 3 | 129 |
| 2021 | 261 (72%) | 103 | 1 | 116 |
| 2020 | 266 (73%) | 99 | 0 | 99 |
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 (6)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| SEILING | 860 | 9 |
| VICI | 668 | 12 |
| CANTON | 650 | 3 |
| TALOGA | 372 | 5 |
| DEWEY CO RWD #2 | 150 | 7 |
| DEWEY CO RWD #1 | 129 | 22 |
TRI Facilities (1)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Iochem Corp | 4.4K lbs |
Cities in Dewey (5)
Frequently Asked Questions
What is the environmental risk level in Dewey, Oklahoma? ▼
Are there Superfund sites in Dewey? ▼
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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.