Heavy downpours triggered the release of millions of gallons of raw sewage mixed with rainwater across the region in just two weeks, according to an analysis of 88 reports to the state’s Office of …
January’s storms are offering an unsettling glimpse into one of the Bay Area’s dirtiest environmental secrets: Heavy rain overwhelms our region’s vast plumbing system and flushes wastewater into places where it doesn’t belong.
Dozens of other smaller incidents were caused by open manhole covers, broken pipes and overwhelmed treatment facilities, from Corte Madera to Woodside and Half Moon Bay to Pleasanton. In dry times, waste from homes and businesses is whisked immediately away to wastewater-treatment plants, never to be seen, smelled or considered again.
In Redwood City, a manhole overflow sent polluted water into Borel Creek at a rate of 150 gallons per minute. In San Mateo, 100 to 150 gallons per minute flowed into a storm drain that empties into Polhemus Creek. About 50 gallons a minute were dumped into Sonoma Creek. In Oakland, the overflow of three manholes spilled 25,000 gallons into Lake Merritt.
Farther south, a sewage treatment plant was flooded Friday when the Salinas River rushed over the banks of a levee. Percolation ponds in the city of Templeton also were flooded, sending 300,000 gallons into the river.
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