1970 Public sewer Septic tank or Other means cesspool Number Per- Number Per- Number Per- cent cent cent US 48,187,675 71.2% 16,601,792 24.5% 2,904,375 4.3% AL 566,307 50.8% 385,345 34.6% 163,139 14.6% AK 55,511 62.7% 18,629 21.0% 14,423 16.3% AZ 446,304 77.1% 114,433 19.8% 18,013 3.1% AR 355,684 52.9% 220,287 32.7% 96,999 14.4% CA 6,084,632 87.2% 853,013 12.2% 38,324 0.5% CO 612,659 82.5% 113,290 15.3% 16,689 2.2% CT 608,603 62.8% 354,585 36.6% 5,633 0.6% DE 130,259 74.4% 39,860 22.8% 4,870 2.8% DC 277,068 99.5% 454 0.2% 871 0.3% FL 1,509,682 60.6% 938,352 37.7% 42,743 1.7% GA 848,516 57.9% 474,455 32.4% 143,654 9.8% HI 161,438 74.8% 50,558 23.4% 3,844 1.8% ID 137,891 57.9% 93,146 39.1% 7,266 3.0% IL 3,072,266 83.2% 554,603 15.0% 65,080 1.8% IN 1,060,942 62.0% 589,794 34.5% 61,061 3.6% IA 662,320 69.4% 257,889 27.0% 34,829 3.6% KS 594,758 75.5% 163,918 20.8% 28,808 3.7% KY 536,388 50.6% 312,856 29.5% 211,328 19.9% LA 778,247 67.9% 287,481 25.1% 80,245 7.0% ME 169,975 50.1% 140,409 41.4% 28,817 8.5% MD 953,470 77.2% 243,728 19.7% 37,271 3.0% MA 1,339,304 72.8% 490,365 26.7% 9,120 0.5% MI 1,947,137 68.4% 847,433 29.8% 50,509 1.8% MN 864,984 70.9% 307,441 25.2% 47,070 3.9% MS 338,581 48.6% 209,115 30.0% 149,514 21.4% MO 1,173,688 70.5% 359,278 21.6% 132,617 8.0% MT 154,581 64.2% 74,198 30.8% 11,974 5.0% NE 385,860 75.4% 105,320 20.6% 20,266 4.0% NV 147,743 86.1% 21,988 12.8% 1,951 1.1% NH 132,475 53.3% 109,015 43.8% 7,231 2.9% NJ 1,890,977 82.0% 404,241 17.5% 10,123 0.4% NM 230,737 71.6% 65,781 20.4% 25,722 8.0% NY 4,824,525 78.3% 1,289,253 20.9% 44,883 0.7% NC 733,848 45.3% 687,572 42.5% 197,859 12.2% ND 128,967 64.3% 53,074 26.5% 18,457 9.2% OH 2,565,317 74.4% 779,510 22.6% 102,566 3.0% OK 686,240 73.2% 203,174 21.7% 48,413 5.2% OR 448,967 61.0% 275,944 37.5% 10,559 1.4% PA 2,798,522 72.1% 985,014 25.4% 96,502 2.5% RI 197,947 64.4% 107,544 35.0% 1,843 0.6% SC 363,611 45.2% 334,210 41.5% 106,996 13.3% SD 140,258 63.3% 62,366 28.1% 18,970 8.6% TN 671,248 51.8% 457,008 35.2% 168,672 13.0% TX 2,989,684 78.5% 654,283 17.2% 164,950 4.3% UT 258,649 82.9% 49,249 15.8% 3,976 1.3% VT 72,264 48.2% 68,265 45.6% 9,315 6.2% VA 906,030 61.0% 408,213 27.5% 170,580 11.5% WA 786,551 65.3% 403,909 33.5% 14,464 1.2% WV 304,151 51.3% 187,028 31.6% 101,600 17.1% WI 994,926 70.3% 371,567 26.2% 49,549 3.5% WY 86,983 75.9% 23,349 20.4% 4,217 3.7% 1970 data are presented for year-round housing units; vacant seasonal and migratory were excluded.