Delaware County, OH
The federal environmental record for Delaware County (population 231,636): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
3
federal cleanup sites
1
PFAS-detecting water systems
13
TRI facilities
23
open tank releases
Drinking water: PFAS testing
Public water systems serving Delaware 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 |
|---|---|---|
| DEL-CO WATER COMPANY, INC. OH2101412 | PFBA: 10.7 ng/L PFHxA: 8.7 ng/L PFPeA: 6.3 ng/L | above final limit |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
13 facilities in Delaware filed TRI reports for 2024, totalling 156k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| PPG INDUSTRIES OHIO INC - DELAWARE | DELAWARE | Certain glycol ethers, Xylene (mixed isomers) | 69k lb |
| CHARTER NEXT GENERATION - DELAWARE | DELAWARE | Ozone | 30k lb |
| ASTEMO AMERICAS INC. | SUNBURY | Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region), Manganese And Manganese Compounds | 23k lb |
| AMERICAN HOWA OF OHIO | DELAWARE | Diisocyanates | 13k lb |
| ABRASIVE TECHNOLOGY | LEWIS CENTER | Toluene | 11k lb |
| LIBERTY CASTING CO LLC. | DELAWARE | Phenol, 1,2,4-Trimethylbenzene | 9k lb |
| HENKEL US OPERATIONS CORP | DELAWARE | Diethanolamine | 114 lb |
| MIDWEST ACOUST-A-FIBER | DELAWARE | Diisocyanates | 39 lb |
| SAM DONG OHIO INC | DELAWARE | Copper And Copper Compounds | 19 lb |
| WORTHINGTON CYLINDERS CORP | WESTERVILLE | Lead | 3 lb |
| NAGASE CHEMTEX AMERICA | DELAWARE | - | 0 lb |
| OBERFIELDS - SUNBURY OH MASONRY PLANT | SUNBURY | Lead | 0 lb |
| LUVATA OHIO INC FPBU | DELAWARE | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 188 tank facilities in Delaware: 208 tanks in service and 352 closed. 249 fuel releases are on record, of which 23 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Delaware as Zone 1, the highest predicted indoor radon levels (over 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 Delaware, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- DELAWARE MERCURY SPILLLEWIS CENTER
- OLD DELAWARE CITY LANDFILLDELAWARE
- USDA USFS R09 DELEWARE MIDELAWARE