CHICAGO (AP) — Toxic PCBs will not be stored in a central Illinois landfill sitting atop an aquifer that provides water to 750,000 people, Gov. Pat Quinn’s office announced Monday.

The Illinois Environmental Protection Agency agreed to bar PCBs from being dumped in the Clinton Landfill near Clinton after learning that local approval of the landfill in 2002 didn’t include PCBs. The agency initially signed off on a plan by landfill-owner Area Disposal in Peoria and a subsidiary to store the chemical.