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percolation and evaporation pond operation accepting oilfield produced water, which is a highly saline byproduct of local oil production that contains small concentrations of cancer-causing chemicals.

The wastewater allegedly contained arsenic, benzene, ethylbenzene, naphthalene, radionuclides and toluene.Clean Water Fund and AIR alleged the practice has created an underground plume that has spread more than two miles since monitoring wells were established in the area in 2004, and that the contamination may eventually reach Buttonwillow's drinking water supply.

Valley Water Management Company (owner) & Sentinel Peak Resources (oil producer): fined $645,000

Clean Water Fund & Association of Irritated Residents: sued using Prop 65 (Safe Drinking Water and Toxic Enforcement Act of 1986) to shut down pond

other oil companies: inject wastewater deep underground in or near reservoirs where it originated

Central Valley Regional Water Quality Control Board: forced closure of pond out of concern that underground plume will reach Kern River and Bakersfield's drinking water