Defiance County, OH
The federal environmental record for Defiance County (population 38,315): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
4
federal cleanup sites
1
PFAS-detecting water systems
8
TRI facilities
3
open tank releases
Drinking water: PFAS testing
Public water systems serving Defiance with at least one PFAS detection under UCMR5. The federal limit for PFOA and PFOS is 4 ng/L; EPA proposed in May 2026 to rescind the limits for the other compounds, which are shown for information.
| System | Highest results | Reading |
|---|---|---|
| DEFIANCE CITY OH2000111 | PFPeA: 6.8 ng/L PFBA: 6.3 ng/L PFHxA: 5 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
8 facilities in Defiance filed TRI reports for 2024, totalling 395k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| JOHNS MANVILLE CORP PLANT 8 | DEFIANCE | Ammonia, Formaldehyde | 212k lb |
| FWT LLC | HICKSVILLE | Chromium | 96k lb |
| JOHNS MANVILLE PLANT 2 | DEFIANCE | Ammonia, Formaldehyde | 54k lb |
| GENERAL MOTORS LLC GLOBAL PROPULSION SYSTEMS -DEFIANCE | DEFIANCE | Phenol, Cumene hydroperoxide | 28k lb |
| GT TECHNOLOGIES DEFIANCE PLANT 1 | DEFIANCE | Chromium | 3k lb |
| DEFIANCE METAL PRODUCTS | DEFIANCE | Copper, Nickel | 931 lb |
| GT TECHNOLOGIES DEFIANCE PLANT 2 | DEFIANCE | Chromium | 11 lb |
| PARKER HANNIFIN CORP. | HICKSVILLE | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 114 tank facilities in Defiance: 98 tanks in service and 207 closed. 149 fuel releases are on record, of which 3 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Defiance as Zone 2, moderate predicted indoor radon (2 to 4 pCi/L average). Radon and air quality are covered in depth on lung.com.
The record for one specific address
County figures blur what matters: distance. The Address Environmental Report runs these same federal datasets against one address and reports every site, tank, polluter and water result around it, with distances, in about a minute.
Get the report - $39All federal cleanup sites on file
The wider Superfund enterprise inventory (SEMS) for Defiance, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- DEFIANCE PRECISION PRODUCTS SITEDEFIANCE
- GLYCERIN TRADERS LLCDEFIANCE
- SK HANDTOOLDEFIANCE
- ZELLER 1DEFIANCE