Alto Sanitary District (ALS) is the sewer agency responsible for waste water collection from the homes and businesses in the Alto neighborhood- an unincorporated area of Mill Valley.  Alto is located generally in the Sutton Manor/Alto neighborhood just west of the 101 freeway and hillside to the east of the 101 freeway north of Tiburon Boulevard and west of North Knoll Road.

Alto Sanitary District is a governmental Special District. The Sewerage Agency of Southern Marin (SASM), of which ALS is a member, has the sewage treatment responsibility. ALS also has responsibility for trash collection for which Mill Valley Refuse Service currently holds the contract. Property owners within the Alto community pay their sewer bills via their property tax assessments, and their trash collection directly to Mill Valley Refuse.

CASH FOR SEWERS:  Are you repairing your sewer lateral?  To learn about low-cost loans or even grants to pay for your sewer repair please follow this link to the SASM website.