The vast majority of water managed by Occidental is co-produced from hydrocarbon reservoirs with oil and gas; this is called produced water. Produced water occurs naturally in oil and gas reservoirs. After separating produced water at the surface from the produced oil and gas, Occidental often reinjects it into mature oil and gas reservoirs as part of its improved oil recovery (IOR) operations. Produced water is sometimes reused during drilling, completions and well stimulation – including hydraulic fracturing. When produced water is returned to its original source in deep geologic reservoirs, it is not consumed or removed from the environment. When produced water cannot be used beneficially, it is disposed of by injection into government-approved saltwater reservoirs designated for that purpose.