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In Spring of 1993 there was a widespread outbreak of diarrhea, stomach cramps, fever, and dehydration among Milwaukee residents. Cryptosporidium oocysts passed through the filtration system and was identified in the water from the Howard Avenue Water Purification Plant.

An estimated 403,000 people became ill in the Milwaukee Cryptosporidium Outbreak.

It was the largest waterborne disease outbreak in U.S. history.

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