If they don't pollute the wells, they will have clean and safe water. ( Change the sentence to if 3 beginning: if..........)?

If they pollute the wells, they will not have clean and safe water.

If the wells are not polluted, they will have clean and safe water; if they are protected from contamination, they will not be polluted; if they take precautions to prevent pollution, they will have clean and safe water.