On October 8, 2023, Governor Gavin Newsom signed into law Senate Bill 389 (“SB 389”), which amended § 1051 of the Water Code to expand the investigatory authority of the State Water Resources Control Board (“Water Board”). The bill was introduced by Senator Ben Allen of Santa Monica. While the bill imbues the Water Board with additional investigatory authority to ascertain whether or not a water right is valid, it does not alter the statutory scheme for enforcement should the Water Board determine as part of an investigation that a particular diversion or use of water was not supported by a requisite water right.