Noticed some organic matter in our well water so began to clean the
system. At which time I also noticed a failed check valve near the
water tank. It was removed and replaced. Also at this time I decided
to check the water coming directly from the well.

When the pump first starts the water has a lot of organic matter.
After running for a few seconds it starts to become cleaner and by 1-2
minutes is very clean. If I turn the pump off for ~ 24 hours and then
start get the same results.

Since the well is ~ 230 ft deep am guessing that the organic matter is
due to a leak around the well cap. Should add that the well cap is
below the ground. Did a search but only found one posting.
http://groups.google.com/group/alt.h...3e b4f1385357
I only recently discovered this problem so do not know if it only
occurs during or shortly after a rain.

Appreciate any comments, suggestions or tips on "state of the art"
techniques for sealing below ground well caps.

Gene OHara