Imperial Refining Company
Deleted NPL SiteArdmore, OK
According to the EPA Superfund Enterprise Management System, Imperial Refining Company in Ardmore, OK is listed with NPL status Deleted NPL Site. Its Hazard Ranking System (HRS) score is 30.00. The public extract catalogs 4 contaminant records for this site. EPA marks construction of the cleanup remedy as complete. The site has been deleted from the NPL in the EPA record. NPL listing is a cleanup-authority designation, not a measured health-risk score.
Superfund National Priorities List inclusion (status and HRS score shown above) is the EPA's formal designation that a contaminated site qualifies for long-term federal cleanup authority under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). A federal-facility classification means the site is owned or operated by a federal agency, which routes cleanup responsibility differently than a privately owned site.
"Construction Complete" (status shown above) is an EPA milestone marking that the physical remedy work is finished, not that the site has exited EPA oversight; long-term monitoring can continue afterward. Deletion from the NPL is a separate, later step the EPA takes only once it determines every planned response action is finished.
NPL listing is a cleanup-authority designation in the EPA record, not a quantitative health-risk score. HRS scores of 28.50 or above qualify a site for the NPL under the EPA screening model (toxicity, pathways, waste quantity, and affected population factors). For current site conditions and official community notices, see the EPA Regional Superfund profile and the Oklahoma environmental agency.
What is the cleanup status of this Superfund site?
Contaminants
| Contaminant | Media |
|---|---|
| ARSENIC | Sediment |
| ARSENIC | Soil |
| BENZO[A]PYRENE | Sediment |
| BENZO[A]PYRENE | Soil |
Location
Other Superfund Sites in Oklahoma
| Site Name | Status | HRS Score |
|---|---|---|
| Compass Industries (Avery Drive) | Deleted NPL Site | 36.57 |
| Double Eagle Refinery Co. | Deleted NPL Site | 30.83 |
| Eagle Industries | NPL Site | 50.00 |
| Fansteel Metals/FMRI | NPL Site | 0.00 |
| Fourth Street Abandoned Refinery | Deleted NPL Site | 30.67 |
| Hardage/Criner | NPL Site | 51.01 |
| Henryetta Iron and Metal | NPL Site | 49.33 |
| Hudson Refinery | NPL Site | 29.34 |
| Mosley Road Sanitary Landfill | Deleted NPL Site | 38.06 |
| National Zinc Corp. | Proposed NPL Site | 50.00 |
How does this site's HRS score compare in Oklahoma?
Of the 18 Oklahoma Superfund sites with a scored Hazard Ranking System (HRS) evaluation, Imperial Refining Company ranks #15 by score (30.00).
Either side of it: Double Eagle Refinery Co. (30.83), Fourth Street Abandoned Refinery (30.67), Hudson Refinery (29.34), Sand Springs Petrochemical Complex (28.86)
Frequently Asked Questions
What is the Imperial Refining Company Superfund site? ▼
What does NPL listing mean for Imperial Refining Company? ▼
What is the HRS score for Imperial Refining Company? ▼
What contaminants are at the Imperial Refining Company site? ▼
What is the cleanup status of Imperial Refining Company? ▼
NPL listing is a cleanup-authority designation in the EPA record, not a quantitative health-risk score. See Superfund Sites Explained for how the National Priorities List, Hazard Ranking System, and cleanup phases work.
Read our methodology - how this data is sourced, computed, and verified.