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Old water wells were gravel packed and the dirt
Most states did start legislation to require retards some years back
Even now properly constructed wells often are in flood zones
Unfortunately significant contamination does enter the aquifer via wells
In the farm country wells were drilled or dug at every homestead and not properly abandoned
Now current laws do require proper retards in most cases
Back flow prevention is also required but does fail
Never ever assume that your water source is pristine unless it is tested and monitored
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