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San Mateo receives update on $1.035 billion wastewater plant upgrade; council told up to $9.6M may still be needed
Summary
San Mateo City Council received a study‑session update March 2 from Public Works on the Clean Water Program. Presenters said the wastewater plant is largely complete, with an estimated finish cost of $1,035,000,000 and potential near‑term needs of roughly $9.6 million for remaining plant and system work.
Mayor Lorraine welcomed attendees at a March 2 special meeting of the San Mateo City Council and opened a study session on the city’s Clean Water Program, an years‑long effort to modernize sewer conveyance and the wastewater treatment plant.
Tom Williams, engineering manager for the Clean Water Program, said the project traces to a 2009 cease‑and‑desist order and has included pump stations, conveyance work and the treatment plant. “We projected in 2017 that we’d spend $991,000,000,” Williams said. “The current estimate at completion is $1,035,000,000,” about a 4.4% increase from that earlier projection.
The presentation outlined major upgrades at the plant: a new headworks to screen grit and debris, enclosed primary clarifiers with odor control, biological nutrient removal (BNR) and a membrane bioreactor (MBR) that Williams described as producing much clearer effluent than the older plant. He said performance testing is ongoing and that the new processes will be operational this…
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