Global Water Crisis and Potable Reuse: Key Insights

Name: From Waste to Value: Rethinking the Water Crisis | Michelle Nazareth, MBA ’27
Uploaded: 2026-04-03T20:13:29.983292+00:00
Duration: 10 min 36 s
Channel: Stanford Graduate School of Business
Description: Summary and key takeaways on Global Water Crisis and Potable Reuse: Key Insights, covering The Global Water Crisis Two billion people currently live in

Stanford Graduate School of Business

Apr 03, 2026

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10 min video

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2 min read

YouTube video ID: EK_QQv_xvJU

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Two billion people currently live in water‑scarce regions, and global water demand is projected to increase 55 % by 2050. In India, poor families can spend up to 15 % of their monthly income just to access water. Bangalore, once famous for its more than 100 lakes, faced a severe water crisis in 2024 after local water bodies degraded, illustrating how failing infrastructure amplifies scarcity.

The Psychology of Water

People instinctively view “new” water as clean and label “old” water as dirty, a bias that fuels disgust toward recycled supplies. This psychological barrier halted San Diego’s “toilet to tap” water‑reuse project in the early 2000s. Over time, education and necessity shifted public attitudes, allowing the same facility to become operational in March 2022.

The Solution: Potable Water Reuse

Eighty percent of global wastewater is released into the environment without proper treatment. Potable water reuse cleans wastewater to a standard safe for human consumption and pipes it back into municipal systems. Properly treated recycled water can be cleaner than conventional drinking water sourced from rivers, because “so long as it’s properly treated, it doesn’t matter whether it comes from a treatment plant or a spring.”

The reuse process mirrors the natural water cycle: every drop on Earth today has already passed through endless cycles of purification and reuse in nature. Scaling this technology requires three strategic actions: widespread education to overcome disgust, substantial investment in high‑standard treatment facilities, and policies that normalize recycled water as a reliable supply.

Strategic Shift

Normalizing recycled water hinges on coordinated effort. Governments must enact regulations that mandate reuse targets, while private investors fund advanced treatment plants. Educational campaigns should highlight that wastewater is one of the most neglected resources we have, and demonstrate that “this water is actually cleaner than conventional drinking water sourced from rivers.” When these elements align, what once seemed impossible suddenly becomes obvious.

Takeaways

Two billion people live in water‑scarce regions and demand is set to rise 55 % by 2050, pressuring low‑income families who may spend up to 15 % of their income on water.
Psychological bias labels recycled water as dirty, a sentiment that stopped San Diego’s early reuse project until education and necessity changed public opinion.
Eighty percent of wastewater is discharged untreated, yet potable reuse can produce water cleaner than river‑sourced drinking supplies when properly treated.
The reuse process replicates nature’s endless purification cycles, proving that source origin is irrelevant once water meets high treatment standards.
Widespread education, investment in advanced treatment, and supportive policies are essential to normalize recycled water and resolve the global crisis.

Frequently Asked Questions

Why do people resist potable water reuse despite its safety?

People resist potable water reuse because they instinctively view “old” water as dirty and experience disgust toward recycled supplies. This bias, known as the new‑vs‑old water perception, can be overcome through education and demonstrated necessity, as shown by the eventual acceptance of San Diego’s reuse facility.

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Helpful resources related to this video

If you want to practice or explore the concepts discussed in the video, these commonly used tools may help.

Home Water Quality Testing Kit Recommended

Tests for contaminants in tap water, helping users understand the safety and quality of their local water supply.

Amazon →

High Capacity Home Water Filtration System

Provides advanced purification for household water, aligning with the speaker's focus on the importance of high-standard water treatment.

Amazon →

Books On Global Water Crisis

Provides deeper context on the scarcity issues and infrastructure challenges discussed in the lecture.

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Full Transcript YouTube

Water.
The molecule that supports all life on
Earth.
It's simple,
basic.
It's everywhere, and we take it
completely for granted.
We use it to water our lawns, to flush
our toilets.
We take those long showers, letting it
run while we hope to have shower
epiphanies.
This molecule drives our entire world,
and there is no substitute.
Today,
2 billion people live in water-scarce
regions of the world.
We are in a crisis around water.
This might seem like a distant problem
for those of us in the room.
But actually, farmers right here in
California
are struggling with high water prices.
Global water demand is projected to
increase 55%
by 2050.
And our fresh water resources are
plummeting.
At the core of this crisis is a
misunderstanding.
If I were to tell you that a bottle of
water contains refreshing spring water
from Fiji,
you might pay me $6 for the bottle.
What if instead I told you that it comes
recycled from someone's kitchen?
You'd be disgusted.
We think new water is clean.
Old water is dirty.
Water from certain places is better than
water from other places.
Take swimming pools, for example.
When I was a kid, I was terrified of
swimming pools.
The thought of swimming there with
everyone together made me so anxious.
What if people hadn't showered properly?
Or the worst question of all, right?
What if someone had peed in the pool?
But then I learned about chlorination
and filtration systems,
about how pool water is actually quite
clean, despite the fact that people swim
there together.
We often end up rejecting things that
make us psychologically uncomfortable,
like wastewater reuse.
In India, where I grew up,
water from the tap is undrinkable.
No matter what income level you are at,
you have to spend time or money
accessing drinking water.
And for a poor family, spending on water
can be as high as 15% of their monthly
income.
As a child, I used to think, "Why?
Why do people have to spend money on
accessing water?
Shouldn't it be more freely available?"
The reason it's not available is because
it's being bottled or shipped in tankers
from far away.
It seemed absurd to me.
And then, in the summer of 2024,
my hometown Bangalore, the Silicon
Valley of India,
ran out of water.
My flatmates and I quickly adjusted,
using fewer dishes, taking one bucket
baths.
But something that had been mundane was
suddenly scarce and precious.
One afternoon that summer,
I passed by a line of people waiting to
collect water from a public tanker.
There were small children in that line,
standing in the scorching heat of the
sun,
with buckets almost as tall as they
were.
But just 200 m away,
there was a lake.
Bangalore was once the garden city of
India.
It was this haven that people retired
to.
The city sourced its water from over 100
lakes.
Those lakes are now useless,
filled with foam and garbage.
One of them had even caught on fire.
Seeing that
made me so angry.
Here was a community in desperate need
of water,
and a water source right next to them
that was utterly unusable.
Was there really no way that we could
get the water from the lake
to the people who needed it?
And so, over the next year, as an
investor in climate tech solutions,
I went on a mission to understand water
better.
And one thing became clear to me.
Wastewater
is one of the most neglected resources
that we have.
It flows everywhere, through our cities,
our farms, our factories, and our
watersheds.
But we have systematically underinvested
in it.
So, what if things were different?
What if the access to safe, clean water
was universal?
What if
industries could simply recirculate the
water they already use, instead of
continuously drawing on fresh water
resources?
Imagine if we treated every drop of rain
as a resource, capturing and cycling it
back into use.
That world is possible,
but only if we change our understanding
of recycled water.
Let me explain how this works and why it
matters.
Today, we treat wastewater, but we use
it for non-potable purposes only.
Irrigation, flushing toilets, washing
cars.
80% of global wastewater is actually
released back into the environment
without proper treatment.
Instead, we draw on fresh water
resources from far away at enormous cost
and enormous energy.
We could be reusing the water we already
have right here.
The solution to fix this actually
exists.
It's called potable water reuse.
Wastewater can be sent into a treatment
plant,
be cleaned to a high standard, safe for
human consumption,
and then be piped directly back into the
systems that supply our homes.
This water is actually cleaner than
conventional drinking water sourced from
rivers.
But the public perception around it has
prevented governments and utilities from
investing in it.
In the early 2000s, San Diego attempted
to install a water reuse facility.
But people balked at the idea of
drinking wastewater.
A brewery led this opposition, using the
slur "toilet to tap", and successfully
halted the facility's plans.
They were scared that wastewater in
their products
would Customers would shy away from
wastewater in their products.
But frequent droughts, combined with
public education about the treatment
process,
helped change attitudes.
Nearly two decades later, in March 2022,
San Diego's first operational water
reuse facility was completed.
This is what gives me hope.
I know this shift seems hard,
but our minds can change.
What seemed impossible suddenly becomes
obvious.
20 years ago,
living in a stranger's house on vacation
would have seemed unthinkable.
But today, we call it Airbnb,
and we take it for granted.
So, our certainties can change.
Now, for this shift to happen,
we need three things working together.
The first is education.
We have to change the narrative around
recycled water.
My call to all of you here today is to
be active and curious about where your
water comes from,
and at what cost.
Be an advocate.
Every drop of water on Earth today has
already passed through endless cycles of
purification and reuse in nature.
As the saying goes, you might all be
drinking dinosaur pee.
The second is innovation and investment.
There is an economic cost to this shift,
and it is not small.
We have to put money and work behind
solutions that make it
cost-efficient and effective for
utilities and municipalities to adopt
water reuse.
And the third is policy.
For those of you going into the public
sphere,
push for policies
that prioritize water reuse over other
expensive alternatives.
We have a choice.
We can let our psychological discomfort
limit us,
keep us locked into solutions that are
expensive, inefficient, and
environmentally degrading.
Or we can realize that water is
endlessly recyclable.
So long as it's properly treated, it
doesn't matter whether it comes from a
treatment plant
or a spring.
This shift in understanding will have
enormous implications for our lives, our
future, and our world.
Thank you.
>> [applause]
[cheering]