1990 1% |
1980 1% |
1970 Form 2 Metro |
1960 1% |
"If a well provides water for six or more houses or apartments, mark A public system. If a well provides water for five or fewer houses or apartments, mark one of the categories for individual well. Drilled wells, or small diameter wells, are usually less than 1 1/2 feet in diameter. Dug wells are generally hand dug and are wider."