15th ANNIVERSARY OF WATER CRISIS

  • Dr. Ian Gilson and nurse Mary Busalacchi treated several of the AIDS patients who died during the cryptosporidium outbreak in Milwaukee. (Photo by Erin Toner)

Fifteen years ago, 400,000
people got sick and more than 100 died
from contaminated drinking water. It’s
still the biggest outbreak of waterborne
disease ever in the United States. It
happened because a parasite got into the
water supply in Milwaukee. Since then,
there have been major changes in water
systems across the nation. Erin Toner
reports:

Transcript

Fifteen years ago, 400,000
people got sick and more than 100 died
from contaminated drinking water. It’s
still the biggest outbreak of waterborne
disease ever in the United States. It
happened because a parasite got into the
water supply in Milwaukee. Since then,
there have been major changes in water
systems across the nation. Erin Toner
reports:

Dr. Ian Gilson has been treating AIDS patients for 25 years. He says in all that time,
nothing’s been as bad as 1993 when Milwaukee’s drinking water was contaminated with
a parasite called cryptosporidium.

“We began to get reports of some of our patients having diarrhea that didn’t stop and we
had patients with weird stuff like an ulcer that was not related to acid, severe gall bladder
disease without stones. Ultimately by the time it was called a waterborne epidemic we
knew we had a big problem on our hands.”

Healthy people who drank the water, or brushed their teeth with it, or ate food that was
washed in it, had severe vomiting and diarrhea. But people with weak immune systems,
like those HIV with AIDS, couldn’t fight the parasite. And there weren’t good AIDS
drugs back then, so the patients just deteriorated.

“I distinctly remember several patients saying if you can’t get me over this let’s just be
done with this. One guy who was suffering terribly, we couldn’t seem to get him enough
morphine. And I ordered what I thought was a fatal dose of morphine because I thought
that was the only thing that was going to help him. And it actually relieved his pain.”

When it was all over, cryptosporidium killed 103 people with HIV and AIDS. Even after
15 years, the source of the parasite is still a mystery.

“The cause is not known and may never be known. There does not seem to be any
obvious explanation.”

Carrie Lewis is superintendent of Milwaukee Water Works. She says at the time of the
outbreak, the city pumped in water through an intake pipe about a mile off shore in Lake
Michigan.

The prevailing theory is that sewage overflows contaminated water in the bay, and that
the water was pushed toward the intake pipe and entered the treatment plant.

Lewis doesn’t buy it.

She says if human sewage was the source, people would have had to be sick to excrete
the parasite, and there’s no evidence of that. Some also speculate that cow manure
contaminated area rivers, but Lewis says regular testing in the watershed rarely finds
traces of cryptosporidium.

Lewis says she has no clue what happened, and she’s OK with that. She says what’s
important is what’s changed since then. Lewis says water testing at the time of the
outbreak amounted to taking a couple of samples a day – and that was considered good.

“Today we have hundreds of instruments testing the water every single second for all
sorts of different parameters, so the 15 years that’s gone by it’s a lifetime.”

The cryptosporidium outbreak so damaged Milwaukee’s psyche that people were willing
to do just about anything to make the water safe again. The city spent $90 million to
extend the intake pipe farther out in Lake Michigan. The filters at purification plants were
updated. And now the water is treated with ozone, which kills cryptosporidium.

What happened in Milwaukee caused changes around the country.

New federal regulations required water systems to test for the parasite and safeguard
against it. A drug was licensed to treat the disease.

Michael Beach is associate director for healthy water at the Centers for Disease Control
and Prevention. He says today people should have a lot of confidence when they turn on
their tap.

“Those types of outbreaks have virtually disappeared from the tracking system.”

Many water experts say municipal drinking water in this country is now the safest in the
world. They say the legacy of the Milwaukee outbreak is that water utilities are no longer
just managing a system of pipes and water mains – they’re in the business of protecting
public health.

For The Environment Report, I’m Erin Toner.

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