In a Notice published in the Federal Register on April 21, the U.S. Environmental Protection Agency (EPA) and the Department of the Army (Army) finalized the Navigable Waters Protection Rule, which provides updated regulations on what waters fall under the jurisdiction of the Clean Water Act.

As part of the ongoing mediation for Massachusetts and New Hampshire’s small municipal separate storm sewer systems (MS4s) general permits, EPA published a Notice of Availability in the Federal Register of the proposed permit modifications on April 23.