Pennsylvania
| TOTAL PERSONS | TOTAL HOUSING UNITS | PUBLIC SYSTEM | DRILLED WELL | DUG WELL | OTHER SOURCE | PUBLIC SEWER | SEPTIC TANK | OTHER MEANS | |
| 11,881,643 | 4,938,140 | 3,854,953 | 905,420 | 72,800 | 104,967 | 3,670,338 | 1,210,054 | 57,748 | |
| COUNTIES | |||||||||
| ADAMS | 78,274 | 30,141 | 13,701 | 14,461 | 1,194 | 785 | 14,210 | 15,238 | 693 |
| ALLEGHENY | 1,336,449 | 580,738 | 568,562 | 9,880 | 796 | 1,500 | 553,094 | 26,163 | 1,481 |
| ARMSTRONG | 73,478 | 31,757 | 17,916 | 9,504 | 1,270 | 3,067 | 12,983 | 18,068 | 706 |
| BEAVER | 186,093 | 76,336 | 61,228 | 13,618 | 653 | 837 | 52,708 | 23,265 | 363 |
| BEDFORD | 47,919 | 21,738 | 6,414 | 12,408 | 1,064 | 1,852 | 5,131 | 15,983 | 624 |
| BERKS | 336,523 | 134,482 | 94,082 | 36,219 | 2,628 | 1,553 | 95,676 | 37,463 | 1,343 |
| BLAIR | 130,542 | 54,349 | 40,530 | 11,869 | 921 | 1,029 | 39,777 | 14,063 | 509 |
| BRADFORD | 60,967 | 27,058 | 10,193 | 14,338 | 775 | 1,752 | 8,256 | 17,693 | 1,109 |
| BUCKS | 541,174 | 199,934 | 153,922 | 42,791 | 2,716 | 505 | 163,998 | 35,000 | 936 |
| BUTLER | 152,013 | 59,061 | 29,413 | 25,942 | 1,131 | 2,575 | 29,616 | 28,602 | 843 |
| CAMBRIA | 163,029 | 67,374 | 58,172 | 6,012 | 1,137 | 2,053 | 48,541 | 17,559 | 1,274 |
| CAMERON | 5,913 | 4,399 | 2,132 | 1,318 | 284 | 665 | 1,534 | 2,519 | 346 |
| CARBON | 56,846 | 27,380 | 15,145 | 11,104 | 689 | 442 | 13,232 | 13,657 | 491 |
| CENTRE | 123,786 | 46,195 | 37,283 | 6,193 | 793 | 1,926 | 31,285 | 14,341 | 569 |
| CHESTER | 376,396 | 139,597 | 89,075 | 45,790 | 3,526 | 1,206 | 85,633 | 52,493 | 1,471 |
| CLARION | 41,699 | 18,022 | 7,649 | 5,726 | 1,220 | 3,427 | 6,056 | 11,502 | 464 |
| CLEARFIELD | 78,097 | 34,300 | 24,715 | 5,161 | 1,681 | 2,743 | 15,573 | 17,725 | 1,002 |
| CLINTON | 37,182 | 16,478 | 11,364 | 2,783 | 336 | 1,995 | 9,668 | 5,563 | 1,247 |
| COLUMBIA | 63,202 | 25,598 | 13,566 | 10,387 | 905 | 740 | 10,788 | 14,423 | 387 |
| CRAWFORD | 86,169 | 40,462 | 14,723 | 23,421 | 1,250 | 1,068 | 19,494 | 20,185 | 783 |
| CUMBERLAND | 195,257 | 77,108 | 56,853 | 18,679 | 908 | 668 | 56,756 | 19,640 | 712 |
| DAUPHIN | 237,813 | 102,684 | 80,516 | 20,405 | 1,250 | 513 | 82,873 | 18,986 | 825 |
| DELAWARE | 547,651 | 211,024 | 203,751 | 6,248 | 509 | 516 | 197,667 | 12,581 | 776 |
| ELK | 34,878 | 17,249 | 12,436 | 2,960 | 352 | 1,501 | 8,992 | 8,005 | 252 |
| ERIE | 275,572 | 108,585 | 85,781 | 17,665 | 4,457 | 682 | 85,085 | 23,092 | 408 |
| FAYETTE | 145,351 | 61,406 | 50,935 | 6,777 | 746 | 2,948 | 30,241 | 29,510 | 1,655 |
| FOREST | 4,802 | 8,445 | 1,024 | 4,302 | 362 | 2,757 | 493 | 5,656 | 2,296 |
| FRANKLIN | 121,082 | 48,629 | 31,446 | 13,484 | 971 | 2,728 | 30,352 | 17,393 | 884 |
| FULTON | 13,837 | 6,184 | 1,303 | 4,226 | 218 | 437 | 1,140 | 4,853 | 191 |
| GREENE | 39,550 | 15,982 | 10,427 | 3,396 | 542 | 1,617 | 7,321 | 7,963 | 698 |
| HUNTINGDON | 44,164 | 19,286 | 7,643 | 9,400 | 718 | 1,525 | 6,422 | 12,166 | 698 |
| INDIANA | 89,994 | 34,770 | 18,592 | 11,761 | 1,419 | 2,998 | 14,762 | 18,993 | 1,015 |
| JEFFERSON | 46,083 | 21,242 | 11,226 | 6,480 | 1,068 | 2,468 | 8,049 | 12,728 | 465 |
| JUNIATA | 20,625 | 8,505 | 2,601 | 5,084 | 280 | 540 | 2,106 | 6,136 | 263 |
| LACKAWANNA | 219,039 | 91,707 | 78,962 | 11,310 | 745 | 690 | 78,805 | 12,498 | 404 |
| LANCASTER | 422,822 | 156,462 | 102,988 | 46,908 | 4,058 | 2,508 | 108,537 | 46,143 | 1,782 |
| LAWRENCE | 96,246 | 38,844 | 25,277 | 12,277 | 660 | 630 | 24,523 | 13,862 | 459 |
| LEBANON | 113,744 | 44,634 | 31,185 | 11,955 | 1,079 | 415 | 29,726 | 14,595 | 313 |
| LEGIGH | 291,130 | 118,335 | 99,783 | 16,082 | 1,383 | 1,087 | 99,771 | 17,906 | 658 |
| LUZERNE | 328,149 | 138,724 | 114,062 | 21,696 | 1,611 | 1,355 | 111,444 | 26,311 | 969 |
| LYCOMING | 118,710 | 49,580 | 30,370 | 16,249 | 1,192 | 1,769 | 26,650 | 22,167 | 763 |
| MCKEAN | 47,131 | 21,454 | 12,853 | 5,962 | 359 | 2,280 | 12,474 | 8,614 | 366 |
| MERCER | 121,003 | 48,689 | 29,289 | 16,933 | 1,063 | 1,404 | 30,637 | 17,387 | 665 |
| MIFFLIN | 46,197 | 19,641 | 11,608 | 6,440 | 289 | 1,304 | 10,838 | 8,246 | 557 |
| MONROE | 95,709 | 54,823 | 17,577 | 34,816 | 1,753 | 677 | 14,122 | 39,628 | 1,073 |
| MONTGOMERY | 678,111 | 265,856 | 234,786 | 28,747 | 1,969 | 354 | 236,323 | 28,486 | 1,047 |
| MONTOUR | 17,735 | 6,885 | 3,489 | 3,122 | 193 | 81 | 3,727 | 3,056 | 102 |
| NORTHAMPTON | 247,105 | 95,345 | 76,800 | 16,382 | 1,074 | 1,089 | 68,823 | 25,768 | 754 |
| NORTHUMBERLAND | 96,771 | 41,900 | 31,806 | 8,742 | 740 | 612 | 30,339 | 11,136 | 425 |
| PERRY | 41,172 | 17,063 | 4,874 | 10,427 | 685 | 1,077 | 4,733 | 11,329 | 1,001 |
| PHILADELPHIA | 1,585,577 | 674,899 | 673,831 | 390 | 96 | 582 | 667,471 | 3,638 | 3,790 |
| PIKE | 27,966 | 30,852 | 13,977 | 15,574 | 937 | 364 | 4,982 | 25,302 | 568 |
| POTTER | 16,717 | 11,334 | 3,670 | 4,905 | 368 | 2,391 | 3,054 | 7,350 | 930 |
| SCHUYLKILL | 152,585 | 66,457 | 50,882 | 13,290 | 1,395 | 890 | 42,613 | 22,426 | 1,418 |
| SNYDER | 36,680 | 13,629 | 6,081 | 6,414 | 499 | 635 | 6,291 | 6,833 | 505 |
| SOMERSET | 78,218 | 35,713 | 20,528 | 9,938 | 1,290 | 3,957 | 15,164 | 19,353 | 1,196 |
| SULLIVAN | 6,104 | 5,458 | 731 | 4,035 | 219 | 473 | 789 | 4,449 | 220 |
| SUSQUEHANNA | 40,380 | 20,308 | 5,096 | 12,054 | 628 | 2,530 | 4,786 | 14,787 | 735 |
| TIOGA | 41,126 | 18,202 | 6,314 | 9,171 | 784 | 1,933 | 5,152 | 12,295 | 755 |
| UNION | 36,176 | 12,886 | 6,430 | 5,692 | 486 | 278 | 6,180 | 6,540 | 166 |
| VENAGO | 59,381 | 26,961 | 14,570 | 9,051 | 706 | 2,634 | 13,928 | 12,261 | 772 |
| WARREN | 45,050 | 22,236 | 10,426 | 9,718 | 567 | 1,525 | 9,297 | 12,399 | 540 |
| WASHINGTON | 204,584 | 84,113 | 64,539 | 12,882 | 967 | 5,725 | 53,397 | 29,434 | 1,282 |
| WAYNE | 39,944 | 28,480 | 9,383 | 16,279 | 718 | 2,100 | 7,264 | 18,891 | 2,325 |
| WESTMORELAND | 370,321 | 153,554 | 126,708 | 20,895 | 1,565 | 4,386 | 102,768 | 49,195 | 1,591 |
| WYOMING | 28,076 | 11,857 | 3,200 | 7,389 | 415 | 853 | 2,279 | 9,362 | 216 |
| YORK | 339,574 | 134,761 | 88,559 | 39,903 | 3,538 | 2,761 | 83,939 | 49,200 | 1,622 |