The case ("Anderson, et al. v. Pacific Gas & Electric," file BCV 00300) alleged contamination of drinking water with hexavalent chromium (also written as "chromium VI", "Cr-VI" or "Cr-6") in the southern California town of Hinkley. At the center of the case was a facility, the Hinkley compressor station, built in 1952 as a part of a natural-gas pipeline connecting to the San Francisco Bay Area. Between 1952 and 1966, PG&E used hexavalent chromium in a cooling tower system to fight corrosion. The waste water was discharged to unlined ponds at the site, and some percolated into the groundwater, affecting an area near the plant approximately . The Regional Water Quality Control Board (RWQCB) put the PG&E site under its regulations in 1968.