EPA released a final report entitled, Aquatic Ecosystems, Water Quality, and Global Change: Challenges of Conducting Multi-Stressor Vulnerability Assessments.

EPA announced the establishment of a federal Underground Injection Control Class VI Program for carbon dioxide geologic sequestration wells. 

United States v. Links at Columbia, LP, No. 2:11-cv-04232-NKL (W.D. Mo. Aug. 31, 2011). Settling CWA defendants that violated NPDES stormwater permit requirements at a residential development in Columbia, Missouri, must pay a $430,000 civil penalty. 

The Bureau of Ocean Energy Management, Regulation, and Enforcement increased the maximum daily civil penalty assessment for OCSLA violations to $40,000 and the maximum daily civil penalty assessment for violations of its financial responsibility regulations to $30,000.

EPA approved 11 alternative testing methods for use in measuring the levels of contaminants in drinking water.

United States v. Winchester Municipal Utilities, No. 06-102-KSF (E.D. Ky. Jan. 19, 2011). Under a modified 2007 consent decree, a settling CWA defendant responsible for stormwater runoff pollution into the Lower Howards Creek Watershed must spend $203,000 on a watershed management plan that replaces the original supplemental environmental project.

United States v. City of Evansville, No. 3:09-CV-128 (S.D. Ind. Jan. 6, 2011). A settling CWA defendant responsible for violations in the operation of its municipal wastewater and sewer system must pay a $420,000 civil penalty to the United States and a $70,000 civil penalty to Indiana, must spend an estimated $4 million to connect homes with failing septic systems to the city's sewer system, and must remedy the deficiencies in the sewer system at a cost that may exceed $500 million no later than 2037.

United States v. Boeing Co., No. 10-457-LRS (E.D. Wash. Dec. 23, 2010). Settling CERCLA defendants responsible for violations at the Moses Lake Wellfield Superfund site in Moses Lake, Washington, must pay $3.25 million in U.S. response costs incurred at the site. The United States must pay approximately $55 million to EPA for cleanup costs, must pay future response costs not covered by the defendants' payments and those incurred by the state of Washington, and must pay the city of Moses Lake approximately $2.96 million to resolve claims for response costs and attorneys fees.

EPA announced establishment of a TMDL for nitrogen, phosphorus, and sediment for the Chesapeake Bay and its tidal tributaries.

EPA proposed revisions to the NPDES permits for cooling water intake structures at certain facilities to minimize adverse environmental impacts.