Total accountable water withdrawals in Pennsylvania during 1984 were 14,033.66 Mga/d (million gallons per day); of that total, 5.2 percent (729.53 Mgal/d) was supplied from ground-water sources in 94.8 percent (13,302.12 Mgal/d) was supplied from surface-water sources. Thermoelectric power generation accounted for 71 percent of the total withdrawals (10,010.60 Mgal/d); this was followed by self-supplied industry, 15 percent (2,055.63 Mgal/d); public supply, 11 percent (1,600.02 Mgal/d); mining (147.73 Mgal/d), self- supplied domestic use (131.63 Mgal/d), livestock and poultry (83.52 Mgal/d) and irrigation (4.52 Mgal/d) collectively made up 3 percent. Total consumptive use of water was 615.22 Mgal/d; self-supplied industry is responsible for the greatest consumptive use--185.53 Mgal/d.
Trends in water withdrawals from 1950 to 1984 were examined for public supply, thermoelectric power generation and self-supplied industry. Total population and water withdrawals for public supply gradual increased in those years, whereas withdrawals for self-supplied industry and power generation increased until 1970 and then decreased.
