1980 Public sewer Septic tank or Other means cesspool Number Per- Number Per- Number Per- cent cent cent US 64,240,532 74.0% 20,926,961 24.1% 1,591,224 1.8% AL 771,748 53.2% 607,358 41.9% 71,649 4.9% AK 104,797 68.0% 31,262 20.3% 17,992 11.7% AZ 869,862 81.2% 180,665 16.9% 21,260 2.0% AR 514,653 57.9% 336,712 37.9% 37,828 4.3% CA 8,251,415 89.5% 920,690 10.0% 51,015 0.6% CO 1,019,477 87.2% 138,742 11.9% 11,355 1.0% CT 781,657 68.3% 357,446 31.2% 5,417 0.5% DE 172,294 74.8% 54,970 23.9% 3,037 1.3% DC 274,913 99.3% 402 0.1% 1,542 0.6% FL 3,076,260 71.9% 1,167,676 27.3% 34,698 0.8% GA 1,214,548 60.3% 737,539 36.6% 61,752 3.1% HI 270,701 81.5% 57,576 17.3% 3,928 1.2% ID 229,481 63.7% 124,832 34.7% 5,718 1.6% IL 3,656,245 84.9% 614,499 14.3% 33,681 0.8% IN 1,361,704 65.9% 676,718 32.8% 26,693 1.3% IA 830,489 74.1% 273,536 24.4% 17,289 1.5% KS 752,124 79.1% 183,803 19.3% 14,584 1.5% KY 736,144 54.3% 510,637 37.7% 108,653 8.0% LA 1,101,516 71.7% 401,695 26.1% 33,972 2.2% ME 214,145 50.0% 198,629 46.4% 15,471 3.6% MD 1,232,785 79.6% 294,286 19.0% 22,609 1.5% MA 1,581,814 73.9% 550,629 25.7% 8,921 0.4% MI 2,463,078 71.4% 954,965 27.7% 32,653 0.9% MN 1,144,993 74.8% 362,120 23.7% 23,180 1.5% MS 510,732 56.5% 319,285 35.3% 74,506 8.2% MO 1,418,141 72.3% 475,424 24.2% 69,011 3.5% MT 201,014 63.8% 107,018 34.0% 7,066 2.2% NE 492,946 79.7% 114,257 18.5% 11,630 1.9% NV 294,758 87.3% 41,241 12.2% 1,650 0.5% NH 182,656 52.3% 161,386 46.2% 5,130 1.5% NJ 2,327,869 86.5% 350,598 13.0% 11,910 0.4% NM 361,847 73.3% 111,967 22.7% 19,675 4.0% NY 5,279,298 78.7% 1,375,362 20.5% 51,539 0.8% NC 1,040,451 46.8% 1,084,336 48.8% 99,409 4.5% ND 182,570 72.2% 62,357 24.7% 7,822 3.1% OH 3,108,321 76.2% 911,386 22.3% 58,357 1.4% OK 908,666 73.9% 301,354 24.5% 19,502 1.6% OR 735,626 68.6% 326,213 30.4% 9,774 0.9% PA 3,360,158 74.5% 1,083,043 24.0% 69,473 1.5% RI 248,174 68.4% 112,663 31.0% 2,081 0.6% SC 596,811 53.1% 480,455 42.8% 45,661 4.1% SD 189,988 70.5% 71,743 26.6% 7,913 2.9% TN 979,399 56.4% 687,054 39.6% 70,670 4.1% TX 4,461,444 81.3% 938,671 17.1% 85,158 1.6% UT 421,923 87.7% 56,700 11.8% 2,443 0.5% VT 91,707 46.7% 99,752 50.8% 5,000 2.5% VA 1,315,815 65.8% 593,912 29.7% 90,348 4.5% WA 1,117,544 67.7% 520,354 31.5% 13,782 0.8% WV 381,110 51.7% 297,401 40.4% 58,522 7.9% WI 1,262,265 71.9% 467,986 26.6% 26,060 1.5% WY 142,456 78.1% 37,656 20.7% 2,235 1.2% 1980 data are presented for year-round housing units; vacant seasonal and migratory were excluded.