1990 Public sewer Septic tank or Other means cesspool Number Per- Number Per- Number Per- cent cent cent US 76,455,211 74.8% 24,670,877 24.1% 1,137,590 1.1% AL 910,782 54.5% 728,690 43.6% 30,907 1.9% AK 144,905 62.3% 59,886 25.7% 27,817 12.0% AZ 1,348,836 81.3% 282,897 17.0% 27,697 1.7% AR 601,188 60.1% 382,467 38.2% 17,012 1.7% CA 10,022,843 89.6% 1,092,174 9.8% 67,865 0.6% CO 1,283,186 86.9% 183,817 12.4% 10,346 0.7% CT 935,541 70.8% 378,382 28.6% 6,927 0.5% DE 212,793 73.4% 74,541 25.7% 2,585 0.9% DC 276,481 99.3% 575 0.2% 1,433 0.5% FL 4,499,793 73.8% 1,559,113 25.6% 41,356 0.7% GA 1,638,979 62.1% 970,686 36.8% 28,753 1.1% HI 312,812 80.2% 72,940 18.7% 4,058 1.0% ID 264,618 64.0% 142,879 34.6% 5,830 1.4% IL 3,885,689 86.2% 598,125 13.3% 22,461 0.5% IN 1,525,810 67.9% 703,032 31.3% 17,204 0.8% IA 869,056 76.0% 264,889 23.2% 9,724 0.9% KS 847,767 81.2% 187,398 17.9% 8,947 0.9% KY 849,491 56.4% 600,182 39.8% 57,172 3.8% LA 1,246,678 72.6% 442,758 25.8% 26,805 1.6% ME 266,344 45.4% 301,373 51.3% 19,328 3.3% MD 1,533,799 81.1% 342,523 18.1% 15,595 0.8% MA 1,803,176 72.9% 659,120 26.7% 10,415 0.4% MI 2,724,408 70.8% 1,090,481 28.3% 33,037 0.9% MN 1,356,520 73.4% 467,936 25.3% 23,989 1.3% MS 585,185 57.9% 387,406 38.3% 37,832 3.7% MO 1,617,996 73.6% 532,844 24.2% 48,289 2.2% MT 218,372 60.5% 135,371 37.5% 7,412 2.1% NE 534,692 80.9% 117,460 17.8% 8,469 1.3% NV 456,107 87.9% 60,508 11.7% 2,243 0.4% NH 250,060 49.6% 246,692 49.0% 7,152 1.4% NJ 2,703,489 87.9% 357,890 11.6% 13,931 0.5% NM 452,934 71.7% 161,068 25.5% 18,056 2.9% NY 5,716,917 79.1% 1,460,873 20.2% 49,101 0.7% NC 1,403,033 49.8% 1,365,632 48.5% 49,528 1.8% ND 204,328 73.9% 66,479 24.1% 5,533 2.0% OH 3,392,785 77.6% 940,943 21.5% 38,217 0.9% OK 1,028,594 73.1% 367,197 26.1% 10,708 0.8% OR 835,545 70.0% 349,122 29.3% 8,900 0.7% PA 3,670,338 74.3% 1,210,054 24.5% 57,748 1.2% RI 293,901 70.9% 118,410 28.6% 2,261 0.5% SC 825,754 58.0% 578,129 40.6% 20,272 1.4% SD 207,996 71.1% 78,435 26.8% 6,005 2.1% TN 1,213,934 59.9% 781,616 38.6% 30,517 1.5% TX 5,690,550 81.2% 1,266,713 18.1% 51,736 0.7% UT 528,864 88.4% 65,403 10.9% 4,121 0.7% VT 115,201 42.5% 149,125 55.0% 6,888 2.5% VA 1,740,787 69.7% 707,409 28.3% 48,138 1.9% WA 1,387,396 68.3% 630,646 31.0% 14,336 0.7% WV 427,930 54.8% 318,697 40.8% 34,668 4.4% WI 1,440,024 70.0% 580,836 28.3% 34,914 1.7% WY 151,004 74.2% 49,055 24.1% 3,352 1.6%