For many years, natural resource damages (NRD) enforcement in Pennsylvania has been sporadic and fleeting. Like most states, the commonwealth typically only pursued NRD in response to large releases or as part of a "trustee council" with the federal government or other state trustees. Today, NRD enforcement—and NRD law—in the commonwealth is much different. In recent years, the commonwealth, with the help of contingency-fee counsel, have filed a series of increasingly aggressive and far-reaching lawsuits demanding NRD throughout the state. A recent decision from the Pennsylvania Commonwealth Court addressing Pennsylvania's authority and standing to seek NRD may further embolden state officials. The regulated community should be aware of changing NRD landscape in Pennsylvania and work with counsel to manage potential NRD liabilities.