Reality Check: Supreme Court Decision on Water Pollution No Cause for Alarm

The Pennsylvania Supreme Court recently issued a ruling in a case involving EQT and the state Department of Environmental Protection under the Clean Streams Law. The dispute concerned whether civil penalties continue to accrue as long as pollutants remain in groundwater. The court made it clear that it was not passing judgment on the size of DEP’s proposed fines, but rather on how the law should be interpreted.

In its decision the Court ruled that the mere presence of contamination in groundwater does not, by itself, constitute a violation of the Clean Streams Law; the violation occurs when pollutants are introduced into the waters of the Commonwealth. The justices rejected DEP’s so‑called “water‑to‑water” theory, which would have treated the movement of contaminants from one body of water to another as a separate offense. They also clarified that Section 401 of the Clean Streams Law does apply to all discharges that cause pollution, including industrial waste, and declined to address DEP’s broader “soil‑to‑water” theory.

While this decision narrows the state’s penalty theories, it does not strip DEP of its ability to protect streams and rivers. The agency can still issue compliance orders to stop pollution from migrating, and if those orders are violated, additional penalties can result. DEP can also seek criminal sanctions when warranted. The ruling may change how the agency documents and prosecutes cases, but it should not undermine Pennsylvania’s ability to safeguard water quality and hold polluters accountable.