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Supreme Court looking at Maui County groundwater case

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In County of Maui, Hawaii v. Hawaii Wildlife Fund, the Supreme Court will decide whether groundwater is subject to National Pollutant Discharge Elimination System (NPDES) permitting requirements under the Clean Water Act (CWA).

The State and Local Legal Center (SLLC) filed an amicus curie brief arguing that it shouldn’t be.

Maui County injects treated wastewater from wells into the groundwater. Some of the treated wastewater reaches the Pacific Ocean. The Hawaii Wildlife Fund sued the county arguing it was required to obtain an NPDES permit for these discharges.

Per the CWA, a party must obtain an NPDES permit if it discharges a pollutant from a point source to a navigable water. Wells are point sources and the Pacific Ocean is a navigable water. But the treated wastewater in this case doesn’t go directly from the well to the ocean. It is conveyed through groundwater. The Ninth Circuit assumed without deciding groundwater isn’t a point source or navigable waters.

The Ninth Circuit held that the CWA requires Maui to get an NPDES permit in this case. It concluded that the discharges in groundwater are point source discharges because “nonpoint source pollution” excludes, for example, roadway runoff that isn’t “collected, channeled, and discharged through a point source.” Here the pollutants are collected in wells. According to the lower court, they are also “fairly traceable” from the point source to the navigable water and reach the navigable water at “more than de minimis levels.”

The SLLC amicus brief provides a number of examples of discharges from water supply, sanitation and flood control services which will require NPDES permits under the Ninth Circuit’s theory. Obtaining such permits will be costly and unnecessary. The brief explains how the NPDES permitting process is a poor match for regulating groundwater because it is designed to regulate surface water only. Finally, the brief argues that the “text, structure, and legislative history of the Clean Water Act demonstrate Congress’s intent to leave the regulation of groundwater to the states.”

J.G. Andre Monette, Shawn Hagerty and Rebecca Andrews of Best Best & Krieger, wrote the SLLC amicus brief which the following national organizations joined:  National Association of State Legislatures, National Association of Counties, National League of Cities, International City/County Management Association, and the International Municipal Lawyers Association.

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About Lisa Soronen (Full Bio)

Executive Director, State and Local Legal Center

Lisa Soronen is the Executive Director of the State and Local Legal Center (SLLC).  Prior to joining the SLLC, Ms. Soronen worked for the National School Boards Association, the Wisconsin Association of School Boards, and clerked for the Wisconsin Court of Appeals.