Koppers Co., Inc. (Oroville Plant)

Regulatory timeline

1. September 8, 1983Proposed for the NPL
2. September 21, 1984Established on the NPL (final listing)
3. September 4, 2003Construction completed

Projected reinspection cycle

CERCLA requires a five-year review while hazards remain on site. These dates are projected from this site's cleanup timeline — they are estimates, not EPA-published dates. Check the site progress profile for the actual review schedule.

1. September 4, 2023Projected five-year review (reinspection), cycle 4
2. September 4, 2028Projected five-year review (reinspection), cycle 5
3. September 4, 2033Projected five-year review (reinspection), cycle 6

Official EPA records