Thompson Builders Finishes $5 million Beach Force Main Rehab for Sausalito and Marin City

Thompson Builders Corporation has completed a $5 million beach force main rehabilitation project in Sausalito, California, rehabilitating about 2,200 linear feet of a 20-inch sewer line with a new 16-inch liner. EIN Presswire announced the completion on November 12, 2026. Thompson Builders is a privately held, family-owned Northern California general contractor founded in 1989 that delivers commercial, civic, education, healthcare, residential, transportation and water-infrastructure projects for public agencies and private developers.

Inside the Sausalito Force Main Work

The pipeline runs along the bay from the Main Street Pump Station to the treatment plant. The company installed the new 16-inch liner within the existing pipeline, which rehabilitated the line without replacing the entire system.

The company said the new pipeline allows wastewater to travel directly to the treatment plant without being pumped up and over the hill. That reduces the pumping demands and electricity required to operate the Main Street Pump Station, lowering energy costs there.

Civil and mechanical work at the existing pump station and treatment plant formed the rest of the scope. It included demolition of select existing facilities, modifications to the pump station wet well and roof slab, excavation and installation of new valve and flow meter vaults, and installation of two dry weather flow pumps. Crews also added new electrical panels and variable frequency drives, instrumentation, pump station yard piping, pavement resurfacing and connections to the existing force main. The company said the work required temporary flow bypassing and protection of existing facilities because it took place within an active wastewater system.

Thompson Builders' Project Record

According to akta.pro company records, Thompson Builders has been entrusted with over 200 large-scale commercial projects with a combined contract value of over $2 billion, and it has completed over $500 million in Design/Build projects. The same records list a $56.2 million Veterans Memorial Senior Center in Redwood City completed in May 2026 and a $3 million Treasure Island Ferry Terminal contract secured and broken ground on in January 2026.

Earlier Thompson Builders Completions

On November 2, 2026, EIN Presswire reported that Thompson Builders completed a $120 million mental health crisis facility in Chino, California, covering approximately 72,613 square feet. On October 22, 2026, EIN Presswire reported the company's completion of a $10.4 million US Army Torpedo Building and Pier E-2 Improvements project on Yerba Buena Island, which included waterproofing and rehabilitation of the historic Torpedo Building and construction of a new public parking lot and utilities for Pier E-2.

The company's own project portfolio lists its infrastructure and building work across California.