Note that these environmental and water law litigation databases are offered by advocacy organizations based on their policy agendas.
National Association of Manufacturers law center database:
https://lawcenter.nam.org
Natural Resource Defense Council Court Battles webpage/database:
https://www.nrdc.org/court-battles
Sabin Center Climate Litigation Database: https://www.climatecasechart.com
U.S. Chamber of Commerce litigation database: https://www.uschamber.com/cases/search