Since the Clean Water Act of 1972 and the Safe Drinking Water Act of 1974, the U.S. has spent approximately $5 trillion in contemporary dollars fighting water pollution -- about 0.8% of annual GDP across that period. The EPA itself admits that surface water regulations are the one category of environmental rules where estimated costs exceed estimated benefits.
New York City was required to build a filtration plant to address two minor parasites in water from its Croton aqueduct. The project took a decade longer than expected and cost $3.2 billion, more than double the original estimate. After the plant opened in 2015, the city's Commissioner of Environmental Protection noted that the water would basically be "the same" to the public. Jefferson County, Alabama, meanwhile, descended into what was then the largest municipal bankruptcy in U.S. history in 2011 after EPA-mandated sewer upgrades pushed its debt from $300 million to over $3 billion.
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