The U.S. Supreme Court held that Wyoming did not violate the Yellowstone River Compact by allowing its pre-1950 water appropriators to increase their net water consumption by improving the efficiency of their irrigation systems. The compact protects beneficial use water rights in existence prio...

The D.C. Circuit denied a petition challenging a magnesium plant's inclusion on the NPL. EPA uses a hazard ranking system (HRS) to determine whether to place a site on the NPL. Petitioners argued that EPA erred in calculating the HRS score and that if these errors were corrected, the site's ...

A district court held unconstitutional California legislation (SB 990) that prescribes cleanup rules that apply only to a former federal nuclear research and rocket testing facility and criminalizes any sale or disposition of the property until it is cleaned up in accordance with the standards ...

The Second Circuit affirmed a lower court decision that the parent corporation of nine manufactured gas plants (MGPs) is not an "operator" of those plants for purposes of CERCLA liability. The current owners of the MGP sites filed suit against the parent corporation, seeking to recover costs th...

The Michigan Supreme Court held that a company's plan to discharge contaminated water from an environmental cleanup site in the Manistee River watershed into a previously unpolluted site in the AuSable River watershed was manifestly unreasonable and that the state agency should be held accou...

A Maryland court remanded certain provisions in a general discharge permit for mining operations and concrete plants. Petitioners—the owners of mining companies and concrete manufacturing plants throughout the state of Maryland—correctly argued that the wet weather total suspended solids numeric...

A district court granted the Massachusetts Department of Transportation's (MassDOT's) motion for judgment in a case involving its violation of municipal separate storm sewer system NPDES permits in the Boston area and denied an environmental group's motion for additional injunctive relief. Once a co...

A district court held that a lumber company's CERCLA action against the former owner of the company's sawmill and plywood manufacturing plant for reimbursement of past and future cleanup costs associated with the site is not barred by contract. When the lumber company purchased the plant in 1993, th...

Massachusetts' highest court vacated a nuclear power company's action seeking a judgment declaring that state regulations governing cooling water intake structures (CWIS) exceeded the state environmental agency's authority under the commonwealth's Clean Waters Act. A lower court ruled that the ...

A district court, on motions for summary judgment, held that a property owner may go forward with its CERCLA claims against a printing company for environmental contamination stemming from the company's operations, but it dismissed the owner's RCRA claims against the company. The printing compa...