Alto Sanitary District

450 Sycamore Ave
Mill Valley, CA 94941

Alto Sanitary District is a governmental Special District located in Mill Valley, CA, responsible for waste water collection and trash recycling services for approximately 1,200 residents in the Alto neighborhood. As a member of the Sewerage Agency of Southern Marin (SASM), Alto S.D. collaborates with SASM for sewage treatment. Property owners within the Alto community pay their sewer bills via property tax assessments and directly to Mill Valley Refuse Service for trash collection.

With its boundaries encompassing the Sutton Manor Alto neighborhood, Alto Sanitary District serves as the primary sewer agency for the unincorporated area of Mill Valley. Offering low-cost loans and grants for sewer repairs, Alto S.D. provides resources for property owners to maintain their sewer laterals. Additionally, SASM has published a list of certified plumbers for the convenience of property owners, ensuring that all plumbing licenses are current before work begins.

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