Ottawa County, OH
The federal environmental record for Ottawa County (population 39,803): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
2
federal cleanup sites
1
PFAS-detecting water systems
5
TRI facilities
17
open tank releases
Drinking water: PFAS testing
Public water systems serving Ottawa 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 |
|---|---|---|
| OTTAWA COUNTY REGIONAL WATER DISTRICT OH6205011 | PFBA: 7.3 ng/L PFHxA: 6.6 ng/L PFPeA: 4.5 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
5 facilities in Ottawa filed TRI reports for 2024, totalling 798k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| MATERION BRUSH INC | ELMORE | Nitric acid, Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 792k lb |
| NORTHERN MANUFACTURING CO | OAK HARBOR | Chromium, Nickel | 3k lb |
| US ARMY NATIONAL GUARD CAMP PERRY RANGES | PORT CLINTON | Lead | 1k lb |
| GRAYMONT DOLIME (OH) INC. | GENOA | Lead And Lead Compounds, Mercury And Mercury Compounds | 496 lb |
| US GYPSUM CO | GYPSUM | Mercury compounds, Lead compounds | 81 lb |
Underground fuel tanks
EPA's UST Finder records 166 tank facilities in Ottawa: 128 tanks in service and 322 closed. 233 fuel releases are on record, of which 17 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Ottawa 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 Ottawa, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- OAK HARBOR FISH KILLOAK HARBOR
- STANDARD PRODS COPORT CLINTON