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pathogenic diseases known to have affected humans.
The idea of drinking water that was recently sewage swirling
down your toilet bowl, shower drain, or kitchen sink may sound
pretty icky. But experts say it’s actually nothing to be
squeamish about — and it might be coming to your state and city
soon.
It’s a water recycling method known as direct potable reuse, or
DPR, which sends highly treated sewage water almost directly to
a drinking water system for distribution to communities. It’s
legal in Texas, and legal on a case-by-case basis in Arizona.
Multiple other states are in the process of formulating
regulations to legalize it too, including California, Colorado,
and Florida.
The water produced by DPR meets federal drinking water quality
standards, experts say. And there’s a growing movement to urge
people to warm up to the idea of DPR and other sewage recycling
methods, which were once dismissively labeled “toilet-to-tap.”
“People need that change in mindset, forgetting where your water
came from and focusing more on how clean it is when it’s in
front of you,” Dan McCurry, a civil and environmental
engineering professor at the University of Southern California,
tells CNBC Make It.
Recycling wastewater can help avoid drinking water shortages
The process might not sound appetizing, but DPR can prove
invaluable when drinkable water becomes scarce.
Climate change alters patterns in rain and snowmelt, which sends
less fresh water to crucial, natural drinking water sources like
the Colorado River, Lake Mead and Lake Powell — all of which
face severe water shortages amid extreme drought conditions.
Growing populations that demand more drinking water will only
stretch those sources thinner, making methods like DPR all the
more essential.
Two cities in Texas — Big Spring and Wichita Falls — have used
DPR to bolster drinking water supply so far. El Paso is planning
to follow suit, alongside major cities like Los Angeles and San
Diego once state DPR regulations are in place.
Wichita Falls implemented DPR for about a year, starting in July
2014, as an emergency solution to a harrowing five-year drought.
Chris Horgen, the city’s public information officer, says DPR
produced 5 million gallons of treated water each day for the
city, representing a third of the drinking water distributed to
taps.
“The state was that close to delivering water bottles to us in
that final year,” Horgen says. “That’s what would’ve happened
without DPR.”
In El Paso, DPR isn’t live yet, but the project is underway with
a goal of building a long-term sustainable drinking water
supply. Diversifying the city’s drinking water sources could
better prepare it for severe droughts that threaten natural
sources like river water, says Christina Montoya, communications
and marketing manager at El Paso Water Utilities.
“It’s a way to make sure that El Paso will thrive 50 years out
from now,” she says. “We can’t just be planning when an
emergency happens. We need to be planning all the time for the
future.”
Wastewater recycling is nothing new
If you’re still feeling squeamish about DPR, know that it’s
nothing new: There might already be recycled sewage in your
drinking water. Several cities in the U.S. have used a similar
system called indirect potable reuse, or IPR, for decades.
In that system, sewage water is treated at a wastewater
treatment plant, which cleans it to a level that meets the
standards for irrigation, or for watering land and crops. The
water then gets sent to an advanced purification facility, which
McCurry says cleans the water even more, typically putting it
through a three-step process that ensures it meets or even
exceeds state and federal standards for drinking water quality.
By this point, the water is clean. Still, it then goes into an
“environmental buffer” like an underground aquifer, where it can
spend months or even years to undergo further filtration.
Finally, it goes to a drinking water system for distribution,
McCurry says.
DPR cuts out that environmental buffer step, eliminating time,
cost and energy from the process, McCurry says. In some cases,
the water gets sent directly to taps. In other cases, it gets
mixed with raw water — like lake water, for instance — before
entering distribution.
Research shows that advanced purification facilities can
consistently treat sewage to safe drinking standards without
that extra step of an environmental buffer, which is “really not
necessary,” says Patricia Sinicropi, executive director of water
industry trade association WateReuse.
“That technology can really take any type of water from any
source and purify it to the point where the average consumer
will have a good experience drinking it,” she says.
How cities are eliminating the ‘yuck factor’
More than two decades ago, political rhetoric and media
sensationalism sparked heavy public resistance to the concept,
resulting in abandoned projects in cities like Los Angeles. A
2015 survey of 2,000 people across the U.S. found that 13%
definitely refuse to try recycled sewage, 38% are uncertain and
49% are willing to try it.
That’s why some cities are launching test runs first.
San Diego operated a small-scale advanced purification facility
from 2009 to 2013 that successfully demonstrated that DPR can
treat sewage water to safe drinking water standards. That
demonstration facility didn’t distribute any water to taps —
making it perfectly legal — and it allowed the public to visit
and try the water being produced.
In El Paso, a demonstration facility successfully ran its course
for eight months in 2016, according to Montoya. Soon after, the
city gained approval to develop a large-scale facility to carry
out DPR, which will likely be finished in 2026 and produce about
10 million gallons of drinking water daily. Ninety-six percent
of citizens said they were supportive of the city’s DPR plans
after visiting the demonstration facility.
“We know that the technology can treat wastewater to some of the
purest water out there. But it’s that challenge of public
acceptance for other parts of the country,” Montoya says.
“People just need to understand how important it is.”
Los Angeles has a similar plan to avoid repeating history. Jesus
Gonzalez, manager of the recycled water program at the Los
Angeles Department of Water and Power, says the city will open a
demonstration facility at the heart of the city by late 2024 to
serve as a “proof of concept,” after California legalizes DPR
and finalizes regulations by the end of 2023.
“We want to eliminate the ‘yuck factor’ or people’s negative
perception,” he says.
https://www.cnbc.com/2022/08/19/direct-potable-reuse-why- drinking-water-could-include-recycled-
sewage.html?&qsearchterm=water
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