Alto Sanitary District is the sewer agency responsible for waste water collection for approximately 1,200 residents 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 Alto S.D. is a member, has the sewage treatment responsibility. Alto S.D. also has responsibility for trash collection and recycling 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 Service.

DISTRICT BOUNDARIES: Does your property fall within the boundaries of the Alto Sanitary District?  Look up your address at this link: SASM AGENCY MAP.

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.

PLUMBING CONTRACTOR LIST:  SASM has published the following list of certified plumbers for your convenience. Please note that the District does not assert any preferences nor make any guarantees for the contractors listed here and property owners should check to make sure that all plumbing licenses are current before work begins: PLUMBING CONTRACTOR LIST.