We have a casing sticking out of the ground about 2 ft maybe?and it's on a slight hill so there shouldn't be any groundwater getting in.That is alarming. Rain should not cause sand to be stirred up in a deep well. Describe your well head. Do you have a pit, is your casing sticking out of the ground, or what?
From what I've read and talked to locals, after all the heavy rains, the aquifer fills up to a level higher than what it was at before the rains which causes the sediment to "fall" into the aquifer. so everybody with a well in this aquifer have the same issue. we're not talking alot of sand either. I only clean the faucets and washing machine out once a year. and the water is never cloudy or silty or anything like that either after or during the rains.
i hope i'm right about that. does it make sense to you? or do you think there is an underlying problem?