Knox, OH
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 Knox in Ohio · Population: 62,888
TRI sites such as Owens Corning Insulating Systems LLC Mount Vernon; F.t. Precision Inc.; Prestress Services Industries LLC - Plant 6; SDWIS systems such as MOUNT VERNON CITY PWS; KNOX COUNTY WATER AND WASTEWATER PWS; ODRC-PICKAWAY CORRECTION PWS anchor Knox, OH's EPA extract. Derived burden score 16/100 (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 Knox include ODRC-PICKAWAY CORRECTION PWS, while Owens Corning Insulating Systems LLC Mount Vernon leads reported TRI pounds among local Form R filers. AQS median AQI 41 / peak 101 in 2024.
Burden score 16/100 (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 Knox -- 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.
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 | 208 (85%) | 36 | 1 | 101 |
| 2023 | 200 (82%) | 44 | 1 | 105 |
| 2022 | 225 (92%) | 19 | 1 | 119 |
| 2021 | 225 (92%) | 20 | 0 | 97 |
| 2020 | 226 (92%) | 19 | 0 | 80 |
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 Ohio, see the EPA's AirNow.gov.
Water Systems (9)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| MOUNT VERNON CITY PWS | 16,990 | 0 |
| KNOX COUNTY WATER AND WASTEWATER PWS | 7,710 | 0 |
| ODRC-PICKAWAY CORRECTION PWS | 3,376 | 2 |
| FREDERICKTOWN VILLAGE | 2,648 | 0 |
| GAMBIER VILLAGE PWS | 2,300 | 0 |
| DANVILLE VILLAGE PWS | 994 | 0 |
| MARTINSBURG VILLAGE PWS | 240 | 0 |
| GRANDVIEW MHP A PWS | 74 | 0 |
| GRANDVIEW MHP B | 47 | 0 |
TRI Facilities (4)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Owens Corning Insulating Systems LLC Mount Vernon | 70 lbs |
| 2 | F.t. Precision Inc. | 38 lbs |
| 3 | Prestress Services Industries LLC - Plant 6 | 20 lbs |
| 4 | Prestress Services Industries LLC - Mount Vernon Branch | 1 lbs |
Cities in Knox (6)
Frequently Asked Questions
What is the environmental risk level in Knox, Ohio? ▼
Are there Superfund sites in Knox? ▼
How many toxic release facilities are in Knox? ▼
What is the air quality in Knox? ▼
Is the drinking water safe in Knox? ▼
What environmental agencies cover Knox? ▼
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.