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Water Filtration in the Big Apple

New York City’s first – and only – water filtration plant is a marvel of engineering.

by / February 1, 2011
David Kidd

When New York City’s Croton Water Filtration Plant goes online in 2012, it will filter about 10 percent of the Big Apple’s drinking water.

Shown here is a small portion of the 8,000-foot-long water tunnel that will connect the filtration plant with the aqueduct that that delivers water from more than 60 miles away. The tunnel itself was bored out by a special machine that cut a 13-foot circumference hole in the bedrock. Metal piping now lines the face of the rock, reducing the circumference to its final size of 9 feet.

For more information and more photos, visit

Photo by David Kidd.

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Jessica Mulholland Former Web Editor/Photographer

Jessica Mulholland served as the Web editor of Government Technology magazine from October 2012 through September 2017. She worked for the Government Technology editorial team for nearly 10 years.

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