The total amount of water withdrawn in Illinois during 1992 was about 19,076 (Mgal/d) million gallons per day. About 16,101 Mgal/d, or about 84 percent of this total, was withdrawn for thermoelectric-power generation, and about 1,877 Mgal/d was withdrawn by and delivered from public-supply facilities. About 1,910 Mgal/d of surface water was withdrawn, excluding withdrawals for thermoelectric-power generation. Public-supply facilities in Illinois withdrew about 1,210 Mgal/d from Lake Michigan in 1992. The next largest withdrawal of surface water was that by self-supplied industrial users. About 1,068 Mgal/d of the total water withdrawn was ground water; about 25 Mgal/d of this ground water was saline. Public-supply facilities withdrew about 36 percent of the total ground water withdrawn; the second largest withdrawal of ground water was for irrigation.