Much infrastructure work needs to be done, according to the Laborers' International Union of North America, which supports an investment of $100 billion to fund projects. More than 25% of the country's bridges are substandard and about 3,650 dams are not safe, according to the American Society of Civil Engineers. The EPA notes that about 850 billion gallons of sewage a year spill out because of broken or outdated wastewater systems.

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