Active Projects

A view looking over the wastewater plant, with pools, railing and machinery, buildings
  1. WWTP Rehabilitation Project (Phase 2) Update
  2. Digester #2 Rehabilitation Project


450 Sycamore Avenue
Mill Valley, CA 94941

Phase Information & Update

The Waste Water Treatment Plant (WWTP) Rehabilitation Project (Phases 1 and 2) is 90% complete. The first phase of the WWTP Master Plan implementation began in April 2018 and was completed in 2020. Phase 2 started in 2020 and will be completed by the end of 2021 The primary goal in this $20+ million dollar program is to help ensure reliable treatment of wastewater, as well as compliance with regional, State, and Federal regulations. Numerous upgrades of major equipment and rehabilitation of existing infrastructure are key components of these two phases of this SASM construction program.

Completed Project Elements and Ongoing Work Activities

The following is a list of completed project elements and ongoing work activities that are progressing well and remain on schedule to be completed by November 2022:

    Headwork Building Belt-press Room Ventilation Modifications:100% complete.
    Rehabilitation of Secondary Clarifier Number 1: 100% Complete
    Rehabilitation of Secondary Clarifier Number 2: 100% Complete
    Hypochlorite Storage and Transfer System:100% Complete
    Rest Area Improvements: 100% Complete
    Digester Tank Number 1 Floating Cover Replacement: 100% Complete
    Cathodic Protection System (CP-1) Replacement: 100% Complete
    Trickling Filter #1 & #2 Media Replacement: April - October 2022
    Main Plant Switchgear Replacement: May – August 2022