Paul H. Rubin: Why Is the Gulf Cleanup So Slow? - WSJ.com

First, the Environmental Protection Agency can relax restrictions on the amount of oil in discharged water, currently limited to 15 parts per million. In normal times, this rule sensibly controls the amount of pollution that can be added to relatively clean ocean water. But this is not a normal time.

Various skimmers and tankers (some of them very large) are available that could eliminate most of the oil from seawater, discharging the mostly clean water while storing the oil onboard. While this would clean vast amounts of water efficiently, the EPA is unwilling to grant a temporary waiver of its regulations.