Active Projects

A view looking over the wastewater plant, with pools, railing and machinery, buildings
  1. WWTP Rehabilitation Project (Phase 2) Update
  2. Shelter Bay Pump Station Improvements Project Update
  3. Digester #1 Cover Installation


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 2021:

  • 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: 25% Complete
  • Main Plant Switchgear Replacement: 5% Complete