Advertisement Clean Water Act Permits for Discharges to Groundwater: EPA Issues Guidance on County Of Maui v. Hawaii Wildlife Fund Monday, February 1, 2021 On 14 January 2021, the U.S. Environmental Protection Agency (EPA) issued a guidance memorandum on the application of the U.S. Supreme Court’s 23 April 2020 decision in County of Maui v. Hawaii Wildlife Fund (Maui). 1 As a result of the Maui ruling, a range of activities—from stormwater management systems, wastewater management systems such as drain fields, and leaking infrastructure such as storage tanks or impoundments that might pollute groundwater—may now be subject to regulation and permitting under the Clean Water Act (CWA). In the wake of the