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International Boundary and Water Commission: Opportunities Exist to Address Water Quality Problems

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Report Type Reports and Testimonies
Report Date Feb. 5, 2020
Release Date Feb. 5, 2020
Report No. GAO-20-307
Summary:

The U.S. Section of the International Boundary and Water Commission manages two wastewater treatment plants along the U.S.-Mexico border that treat raw sewage, mostly from Mexico. But population growth and aging plant infrastructure allow stormwater to bring bacteria, trash, and sediment from Mexico into the U.S.—affecting public health and the environment in Arizona and California.

The Commission has not taken comprehensive steps to resolve the problem, so we recommended that Congress consider directing the Commission to identify alternatives—including cost estimates and funding sources—to help resolve continuing water quality problems.

Corrosion of the International Outfall Interceptor (IOI) Pipe in Arizona

 Corroded pipe

Corroded pipe

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