California POTWs Launch New Suit Over EPA’s CWA Toxicity Test Method

California publicly owned treatment works (POTWs) are renewing challenges over EPA’s use of contested Clean Water Act (CWA) toxicity test methods, suing in federal court in an effort to block approval of state standards that they charge has the effect of codifying the method, which until now has only been detailed in non-binding guidance. The May 22 suit , Clean Water SoCal, et al., v. EPA, et al ., filed in the U.S. District Court for the Central District of...