Storms send sewage pouring into streets, creeks, San Francisco Bay and Pacific Ocean

[johan]

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.

Downpours triggered the release of millions of gallons of raw sewage mixed
with rainwater across the region in just two weeks, spilling contaminated
water into dozens of rivers, creeks and ultimately into the ocean and San
Francisco Bay, according to a Bay Area News Group analysis of 88 reports
to the state’s Office of Emergency Services.

“Flooded waters contain pathogens,” warned Eileen White, executive officer
for the San Francisco Bay Regional Water Quality Control Board. “If you
touch flood waters, you want to wash your hands thoroughly with soap and
water to make sure that you don’t get yourself exposed.”

When sewage flows into homes and businesses, expensive remediation and
decontamination is needed to make them safe again. Overflows also may have
dangerous consequences for the environment, because human waste,
pharmaceuticals, shampoos and other harmful products are flushed down
drains and toilets.

In one incident, the Martinez Refinery Company reported releasing more
than six million gallons of storm and wastewater into the Carquinez Strait
estuary, which drains into the San Francisco Bay, on Jan. 4, according to
state records. The discharge of partially treated “process water” and
storm water was necessary to avoid damage to the refinery, the company
reported.

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.

State records show that between Dec. 31 and Jan. 3, a total of more than
14 million gallons of sewage were discharged in the San Francisco Bay
region, enough to fill 21 Olympic-sized swimming pools, according to
White. The Jan. 4 storm triggered the release of another 8 million
gallons, or 12 Olympic-sized swimming pools.

More recent releases are still being tallied. Experts say the total volume
is likely to be much larger than current estimates because the chaotic
circumstances surrounding these emergency flooding situations mean it’s
nearly impossible to accurately evaluate the true scale and impact of
sewage contamination.

Like bridges or skyscrapers designed to bear certain weights, stormwater
management systems are designed within the limits of weather — and can’t
handle the intensity of storms that might happen only every decade or two.

In dry times, waste from homes and businesses is whisked immediately away
to wastewater-treatment plants, never to be seen, smelled or considered
again.

But two weeks of near-constant storms have stressed the system, as heavy
rainfall and flooding infiltrate sewer pipes.

“We saw 13 times our average wastewater flows,” said Andrea Pook of East
Bay Municipal Utilities District.

Most of the releases were caused when storm water backs up into the
streets, flowing up through drains or manhole covers forced open by the
overwhelming volume of high-pressure torrents, the reports show.

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.

When a sewage lift station in Daly City overflowed because of stormwater,
35,950 gallons of waste were released into the Pacific Ocean. The rupture
of a main treatment line in Moss Beach also caused a spill into the ocean.
In Pacifica, an overflowing pump station caused 20,000 gallons to be
discharged at Linda Mar Beach. About 34,000 gallons were released in
Menlo Park’s Belle Haven neighborhood when a West Bay Sanitary treatment
plant couldn’t keep up with the flow.

In Richmond, the West County Wastewater facility pumped sewage directly
into the San Francisco Bay, according to a Jan. 11 report. “It is unknown
how long the releasing will be going for,” it said.

Three discharges into Oakland’s San Leandro Creek, Barnhill Marina and an
estuary at the foot of Alice Street originated from the East Bay Municipal
Utility District’s “overflow structures,” which are designed to discharge
water in high-flow conditions.

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.

Mother Nature is wreaking additional chaos. In Oakland, a tree fell on the
sewer line, causing 5,100 gallons of sewage to be released into Sausal
Creek. In Crockett, a hillside eroded and collapsed — causing a pipe to
break and release 2,700 gallons. When debris blocked a sewer conduit,
about 10,000 gallons overflowed into a drain that leads to Oakland’s Lake
Temescal.

Records show that a single day — Dec. 31, New Year’s Eve — was responsible
for the largest number of reports to the California Governor’s Office of
Emergency Services, with 51 discharges in different Bay Area cities.

On that morning alone, there were 15 sewage discharges in 12 cities:
Hillsborough, Woodside, San Bruno, Daly City, Pacifica, Burlingame, Half
Moon Bay, San Lorenzo, Richmond, Piedmont, Oakland and Daly City. By
midnight, there were an additional 36 discharges in 25 cities: Alameda,
Oakland, San Mateo, Richmond, Pacifica, Martinez, El Granada, Montara,
Pittsburg, Corte Madera, San Francisco, Antioch, Redwood City, Dublin, San
Leandro, Albany, Berkeley, Woodside, Vallejo, Menlo Park, Benicia,
Sausalito, Pleasanton, Foster City and Hayward.

The problem isn’t new, said Sejal Choksi-Chugh, executive director of San
Francisco Baykeeper, a nonprofit focused on the health of the San
Francisco Bay. But the constant rain has exacerbated the issue.

“Over the years, and typically every time it rains, we see sewage spills
in the streets and wastewater overflows,” she said. “But the back-to-back-
to-back-to-back major storm events is causing a continuous discharge.
That’s what is new.”

With continued population growth, the demands on our sewer systems have
increased, say experts. Meanwhile, more development leads to more asphalt
and cement, so the bulk of the rainfall ends up in our sewage systems.
And our wastewater pipes, often made of clay, are aging, so water
infiltrates through cracks and gaps.

The rate at which the urban Bay Area is adapting to these threats is
lagging behind the speed at which rain is drowning it, said Choksi-Chugh.
Cities need to invest in replacing pipes and upgrading wastewater
treatment systems to increase storage capacity and install more recycling
technologies, she said. Cities also could incentivize homeowners to
replace old pipes through grants or low-interest loans.

In the absence of major improvements to our sewer infrastructure, these
dangerous overflows will increase as climate change leads to more extreme
weather, say experts.
“Our old infrastructure is just not going to be up to snuff,” Choksi-Chugh
said. “It’s not going to be able to handle these larger storm events, year
upon year. So we really need to be thinking about the future.”

https://www.mercurynews.com/2023/01/15/storms-send-sewage-pouring-into-
streets-creeks-san-francisco-bay-and-pacific-ocean/?itm_source=parsely-api

[Siri Cruise]

In article <XnsAF947...@0.0.0.2>, johan <jo...@eweka.nl>
wrote:

> 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.

I don't know why it's a secret. A city has two choices: storm
drains link directly to creeks to get the relatively clean water
in runoff away from people. Or storm drains can connect to sewers
to treat for any trash in gutters but that risk overwhelming
sewage treatment. Santa Clara County, and I think Los Angeles,
drain directly into creeks and rivers. We have warnings
stencilled at storm drains that all water goes directly to creeks
so people should avoid using gutters as sewers.

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