As someone who had had wells drilled multiple time and lived off wells, I'll share my experience with the process. I am no expert though. Allowing surface water to run into a 300' well for example, would bypass the natural filtering process provided by the soil. Excrement (animal and otherwise), chemicals, etc, on the surface would be allowed to directly contaminate the water table. In California he water can only come out of the well, never back in. Check valves must be installed on the well head to prevent the water being pulled back out of your house and back into the ground by gravity. This is for residential only in my experience. Some water districts in California are experimenting with injecting clean water back into the ground as storage and to prevent salt water intrusion. Also well drilling is really expensive.
deadpottedplant t1_j48xa4b wrote
Reply to comment by CakeBrigadier in Nearly all of California exits the worst drought categories in U.S. Drought Monitor by pneumatichorseman
As someone who had had wells drilled multiple time and lived off wells, I'll share my experience with the process. I am no expert though. Allowing surface water to run into a 300' well for example, would bypass the natural filtering process provided by the soil. Excrement (animal and otherwise), chemicals, etc, on the surface would be allowed to directly contaminate the water table. In California he water can only come out of the well, never back in. Check valves must be installed on the well head to prevent the water being pulled back out of your house and back into the ground by gravity. This is for residential only in my experience. Some water districts in California are experimenting with injecting clean water back into the ground as storage and to prevent salt water intrusion. Also well drilling is really expensive.