Grease at residential well casing.

[Art CUdmore]

I just noticed water in the area around my well casing. I could not see exactly where the leak was coming from, nothing obvious at the above ground joints, but there is a pile of watery grey grease that is building up next to the casing. The pile of grease is about 3" high which seems like a lot. My residential well is 135 ft deep. Where is the grease coming from and, dare I ask, is this really bad?

 

[LLigetfa]

I am pretty sure what you are seeing is bentonite clay that was used to seal the well casing. It swells considerably when wetted. If you look inside the casing, where is the static water level? Possibly the water level has raised high enough to put pressure on the bentonite seal.