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<br /> . <br /> Contamination and/or Pollution <br /> 1. Domestic and municiual <br /> sewage <br /> 2, Industrial wastes <br /> A. Organic wastes <br /> (1) Food processing <br /> (2) Lumber processing <br /> B. Mineral wastes <br /> ( 1) Metal-processing <br /> industries <br /> (2) Mining and ore <br /> extraction <br /> (3) Oil industries <br /> (4) Chemical industries <br /> C. Cooling water <br />t" 3. Solid and semi-solid refuse <br />(;) <br />if! <br />c:- <br /> <br />. <br /> <br />Dep;radation <br /> <br />1. Effects of development, <br />use and re-use of water <br /> <br />A. Irrigation return <br /> <br />B, Interchange between <br />aquifers through <br />defec ti ve wells <br /> <br />C. Overdraft conditions <br /> <br />(1) <br />(2) <br />(3) <br /> <br />Salt-water intru- <br />sion <br />Salt imbalance <br />Upward or lateral <br />diffusion of connate <br />brines <br /> <br />2, Natural causes <br /> <br />A. Inflow or percolation <br />of highly mineralized <br />waters from springs <br />or streams <br /> <br />The foregoing is a very incomplete list. Industrial <br /> <br /> <br />waste, especially, has an almost infinite variety of types <br /> <br />and characteristics. In addition, radioactive wastes may pre- <br /> <br />sent an entirely new series of problems in the near future, <br /> <br />A number of local pollution problems that existed in <br /> <br /> <br />California prior to World War II, were greatly intensified and <br /> <br />new ones created due to population increase and industrial <br /> <br />development immediately after the war. As a result of the con- <br /> <br />cern occasioned by these oroblems, a California water quality <br /> <br /> <br />control program was enacted by the Legislature at its 1949 <br /> <br />session, <br /> <br />Responsibility for the abatement of "contaminatiorr' <br /> <br /> <br />rests with the local health departments and the State Department <br /> <br /> <br />of Public Health, both of which are empowered to issue <br /> <br />-:3- <br />