S.F. seeks a solution to spewing sewage

The filth and stink of sewage spills into streets and the Bay may be stanched by reconstructed pavements lined with trees and gardens, water-absorbent asphalt and other rainwater-catching tools.

A thousand miles of subterranean sewers carry 80 million gallons of raw sewage every dry-weather day to waterfront treatment plants, according to San Francisco Public Utilities Commission figures. The system combines untreated sewage with rainwater that flows into curbside drains.

An unknown amount of untreated sewage spewed out after the ravaging storms earlier this month, according to PUC spokesman Tyrone Jue. He said problems were compounded by storm-related power outages at pump stations.

Problem hot spots after rainstorms include Cayuga Street, which used to be a flood-prone stream, and areas around Lake Merced, according to PUC wastewater planner Rosey Jencks.

“It’s an issue of the pipes not having enough space, and too much water getting into them,” Jencks said.

The City’s plan includes recommendations for rooftop gardens that trap rain for plants, thirsty trees planted in special spongelike soil, water-pervious asphalt, vegetated run-off channels and underground tanks that trap rainwater for irrigation.

During a recent inspection of the city’s sewers, inspector Raymond Mattias showed The Examiner just how foul the subterranean conditions are.

“This one’s still in good shape,” Mattias told The Examiner recently as he squatted in a 5-foot-high brick sewer below Ellis Street in the Tenderloin. A sheet of cockroaches shuffled above the PUC worker’s hard hat as he spoke. “It’s over 100 years old but it’s still functional,” he said. “It’s still working.”

Nearby, a side-sewer spouted steaming water: Somebody was probably taking a shower, Mattias said. Between his gumboots raced a foot-wide stream of liquid filth, which can become a torrent of muck when it rains.

Jencks, who has been working for two years on a plan to help reduce and slow the flow of rainwater into sewers, said she is working with other city departments to draft developer guidelines to ensure new projects are built in a way that reduces storm-water runoff, and she’s working on a citywide effort to draft new standards for streets and roads, she said.

A handful of demonstration projects were finished last year. A rooftop garden was included on the rebuilt Summit Pump Station near the Sutro Tower, and 3.5 acres of vegetated basins were built into the eastern shore of Lake Merced, according to PUC reports.

Such projects are expected to take pressure off The City’s aging underground sewer system.

jupton@examiner.com

Bay Area NewsLocal

If you find our journalism valuable and relevant, please consider joining our Examiner membership program.
Find out more at www.sfexaminer.com/join/

Just Posted

A group of restaurant workers demonstrated outside City Hall in December. The shutdown of outdoor dining during a regional stay-at-home order has been particularly controversial, with restaurants in some parts of the state filing lawsuits. (Kevin N. Hume/S.F. Examiner)
Regional coronavirus stay-at-home orders lifted as ICU capacity improves

Change in rules could allow outdoor dining to resume in San Francisco

A statue of Florence Nightingale outside the Laguna Honda Hospital is one of only two statues of women in The City. (Kevin N. Hume/S.F. Examiner)
S.F. still falling short of goal to represent women in public art

City has few streets or public facilities not named after men

Methamphetamines (Sophia Valdes/SF Weekly)
New search launched for meth sobering center site

Pandemic put project on pause but gave health officials time to plan a better facility

Hasti Jafari Jozani quarantines at her brother's San Francisco home after obtaining several clearances to study at San Francisco State University. (Photo courtesy Siavash Jafari Jozani)
Sanctions, visas, and the pandemic: One Iranian student’s bumpy path to SF State

Changing immigration rules and travel restrictions leave some overseas students in limbo

Woody LaBounty, left, and David Gallagher started the Western Neighborhoods Project which has a Balboa Street office housing historical items and comprehensive website dedicated to the history of The City’s West side. (Kevin N. Hume/S.F. Examiner)
Outside Lands podcast delves into West side’s quirky past

History buffs Woody LaBounty and David Gallagher have been sharing fun stories about the Richmond and Sunset since 1998

Most Read