On Wednesday, the Environmental Protection Agency announced plans to weaken limits on some harmful “forever chemicals” in drinking water roughly a year after the Biden administration finalized the first-ever national standards.

The Environmental Protection Agency said Wednesday that it plans to weaken limits on some “forever chemicals” in drinking water that were finalized last year, while maintaining standards for two common ones.

The administration said it wants to rescind and reconsider whether limits are needed for four PFAS that chemical companies are still producing and using in the U.S. — despite known health risks.