With water consumption by its West Marin customers at the lowest level in 40 years, North Marin Water District may soon raise rates by more than the regular increase anticipated for next year. Water use  fell after the drought years of 2020 and 2021, when conservation ordinances were enacted, and it has yet to bounce back, said Tony Williams, general manager of the district, which serves Point Reyes Station, Olema and Inverness Park along…