In 1952, the Pacific Gas and Electric Company (PG&E) installed a compressor station near the town of Hinkley in San Bernardino County, CA part of a gas pipeline system linking Texas to California. Since then, the company has used a carcinogenic chemical compound named chromium-6 as a corrosion inhibitor in its cooling system. The contaminated water was discharged into unlined pools, thus leaking to the aquifer serving Hinkley’s residents water needs. The leakage occurred (at least) from 1952 to 1972, the year PG&E lined the discharging pools. However, it was not until 1977 that the California state passed a Law regulating the use of chromium-6 and limiting its concentration in water to 50 µg/L.