U.S. cities are facing challenges in funding water infrastructure improvements and are concerned about the affordability of meeting environmental requirements, according to the National League of Cities. Repairs and upgrades of water infrastructure over the next 20 years will require upwards of $650 billion, according to federal estimates. "In our estimation, these investment levels are actually an underestimate given the advancing age of our infrastructure, the burden of unfunded federal regulatory mandates, and factors not yet known as a result of our changing climate," said Michael Sesma, a city council member in Gaithersburg, Md.

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