Established in 1912, the Marin Municipal Water District provides high-quality drinking water to 190,300 customers in central and southern Marin County. Seventy-five percent of our water comes from more than 21,600 acres of protected watershed on Mt. Tamalpais and in the grassy hills of west Marin. Rainfall from these watersheds flows into one of MMWD’s seven reservoirs. This reservoir water is then treated at one of the district’s potable water treatment plants before traveling to customers’ homes and businesses.