Oakland is staring at a multibillion-dollar backlog under its streets: a Sept. 10 city report cited by the Mercury News says much of the stormwater drainage system — pipes, pumps and related gear that in places date back about 85 years — needs upgrades or replacement across a roughly 400-mile network.
City Stormwater and Drain manager Terri Fashing told the Mercury News that an unfinished Storm Drainage Master Plan, launched in 2020 and now about 75% complete, finds an estimated 30% to 40% of the system requires rehabilitation or replacement across those pipes, four pump stations and about 80 miles of creeks and waterways. A full citywide rehab is projected at $3.6 billion and would take at least 70 to 80 years; a prioritized $1.26 billion package of 15 high-priority and 24 medium-priority pipe-capacity projects is expected to span 30 to 50 years, Fashing said.
Who floods first
If the work stalls, the Mercury News reported, West Oakland and East Oakland face heightened risks of flooding, sinkholes and landslides. Federal Emergency Management Agency flood maps summarized in the article put more than 500 structures at risk in a once-in-100-year precipitation event and more than 6,000 in a once-in-500-year storm, with major inundation threats in West Oakland, Jack London Square and East Oakland around the Coliseum. Fashing said low-lying West Oakland and Downtown depend on pump stations and tide gates when rain intensifies. The city's Storm Drainage Master Plan page asks residents to report drainage "hotspots."
El Niño as a stress test
A strengthening El Niño could preview those stresses this winter. The Mercury News quoted Fashing saying the 2026–2027 season is expected to bring larger and more frequent storms that magnify sedimentation, clogging, trash, high-tide backflow and rising groundwater. NOAA, as cited in the article, puts a 75% chance the event reaches historic intensity exceeding El Niños since 1950 — though California rainfall effects are not guaranteed. The piece recalled a Dec. 31, 2022, atmospheric river that closed the Oakland Zoo after flash flooding and a roughly 10-foot sinkhole when debris overloaded a culvert.
To pay for fixes, Oakland is considering a Proposition 218 property-related storm-drainage fee needing simple-majority approval from property owners; a draft aimed at 2029 could raise up to $15 million annually for pipe repair and flood abatement, with bonds and grants also in the mix, the Mercury News reported. Staff also estimate at least $24 million a year for water-quality compliance and about $16.3 million a year to shift maintenance from reactive to preventative. Doing nothing, the city report warned, means rising repair costs, more failures and greater legal liability as climate-driven storms intensify.