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| County of Maui v. Hawaii Wildlife Fund | |
|---|---|
| Case name | County of Maui v. Hawaii Wildlife Fund |
| Citation | 140 S. Ct. 1462 (2020) |
| Decided | April 23, 2020 |
| Court | Supreme Court of the United States |
| Docket | No. 18-260 |
| Holding | A pollutant is subject to the Clean Water Act permitting requirement when its discharge is the functional equivalent of a direct discharge from a point source into navigable waters. |
| Majority | Breyer |
| Joined by | Kagan, Ginsburg, Sotomayor, Kavanaugh |
| Concurrence | Roberts (in judgment), Alito (in judgment) |
| Dissent | Thomas |
County of Maui v. Hawaii Wildlife Fund
County of Maui v. Hawaii Wildlife Fund was a United States Supreme Court decision interpreting the Clean Water Act's National Pollutant Discharge Elimination System permitting requirement for discharges from point source facilities to waters of the United States. The Court adopted a "functional equivalent" test to determine when a pollutant released to groundwater requires a National Pollutant Discharge Elimination System permit because it reaches navigable waters. The ruling resolved a split in the lower courts and shaped subsequent regulatory and enforcement actions involving Environmental Protection Agency, state environmental agencies, and environmental litigants such as Natural Resources Defense Council and Sierra Club.
The dispute arose from wastewater disposal practices at a municipal wastewater treatment facility operated by the County of Maui in Hawaiʻi. The County applied to inject treated effluent into four injection wells that released effluent into underlying basal aquifer and ultimately to the Pacific Ocean near Maui's coast. The Hawaii Wildlife Fund, joined by Earthjustice and other environmental organizations, alleged the County required permits under the Clean Water Act because pollutants would reach navigable waters such as the Pacific Ocean, nearshore waters, and coral reefs. The case involved interplay with prior Supreme Court precedents including Rapanos v. United States, Los Angeles County Flood Control District v. Natural Resources Defense Council, Inc., and statutory frameworks like the Federal Water Pollution Control Act.
Litigation began in federal district court in Hawaii (U.S. District Court), where plaintiffs sought injunctive relief and civil penalties under the Clean Water Act's citizen suit provision. The district court granted summary judgment for the plaintiffs, a decision affirmed by the Ninth Circuit Court of Appeals, which held that the County's discharge required an NPDES permit because pollutants reached the ocean. The County petitioned the Supreme Court, which granted certiorari to resolve whether the Clean Water Act requires an NPDES permit when pollutants pass from a point source to navigable waters via groundwater. The case drew amicus briefs from entities including Environmental Defense Fund, American Petroleum Institute, Association of State Wetland Managers, and Chamber of Commerce of the United States.
In a 6–3 opinion authored by Stephen Breyer, the Supreme Court reversed in part and affirmed in part, holding that the Clean Water Act regulates a discharge of a pollutant through groundwater to navigable waters when the discharge is the "functional equivalent" of a direct discharge from a point source. The majority concluded that the County's injections could, depending on factors such as transit time, dilution, and the nature of the pathway, be subject to permitting requirements. Chief Justice John Roberts and Justice Samuel Alito concurred in the judgment but criticized aspects of the majority's approach; Justice Clarence Thomas dissented, arguing for a narrower reading based on statutory text and precedent.
The Court declined both a categorical rule that groundwater transfers are never covered and the County's favored rule that only direct pipe-to-water discharges require permits. Instead, the majority set forth a multi-factor "functional equivalent" test considering factors such as transit time, distance traveled, the nature of the material through which the pollutant travels, dilution or chemical transformation, the amount and manner of discharge, and the extent to which the pollutant retains its original characteristics upon reaching navigable waters. The decision engaged statutory interpretation tools associated with Chevron U.S.A., Inc. v. Natural Resources Defense Council, Inc. and referenced interpretive methodologies from Massachusetts v. Environmental Protection Agency and Friends of the Earth, Inc. v. Laidlaw Environmental Services (TOC), Inc..
The ruling obliged many municipal, industrial, and agricultural operators to reassess NPDES permitting obligations where subsurface pathways connect point sources to coastal or inland navigable waters, prompting regulatory guidance from the Environmental Protection Agency and action by state agencies such as the California State Water Resources Control Board and Hawaii Department of Health. Environmental advocacy groups used the decision to pursue enforcement and permitting cases involving septic systems, stormwater, and agricultural runoff, while industry groups and municipal associations sought legislative and administrative clarity. The case influenced permit decisions affecting habitats like coral reefs, estuarine systems, and marine protected areas.
Post-decision litigation and rulemaking invoked the functional equivalent standard in matters before the Ninth Circuit Court of Appeals, Eleventh Circuit, and district courts nationwide. The Environmental Protection Agency issued interpretive guidance, and Congress debated statutory amendments to clarify the scope of the Clean Water Act. Related Supreme Court and appellate matters addressing waters of the United States surfaced in cases like Sackett v. Environmental Protection Agency and subsequent disputes over jurisdictional wetlands and point source definitions. The decision remains central in controversies involving groundwater-surface water interactions, coastal zone management, and federal-state regulatory coordination, and continues to be cited in litigation involving National Marine Fisheries Service interests and habitat protection.
Category:United States Supreme Court cases Category:Environmental law