Wellwater Conspiracy was an American rock band that formed in Seattle, Washington in 1993. The band was created by members of the grunge-era side project Hater. Wellwater Conspiracy featured Soundgarden drummer Matt Cameron and ex-Monster Magnet guitarist John McBain. The band originally featured ex-Soundgarden bassist Ben Shepherd, who left the band in 1998. Various other artists have contributed to the band's albums.