If they put in a pond that is being warmed to 90 degrees or so, and that pond is recharging the aquifer, that could be your source of warm water.
You should find out why the pond was built and what it is being used for.
If they are using that pond as a source of cooling water, or if they are using it for discharge of warm water from an air conditioning system or power plant, that could be the source of your problem.
If they are pumping water from the aquifer for cooling, and using that pond to recharge the aquifer, or pumping warm water directly to the aquifer, then it could heat up the aquifer that is supplying your well. It might also be something that the regulatory agencies might be concerned about if you complain. That is the sort of thing that results in interest of lawyers and causes $$$$ to flow.
If there is a leak that is keeping the pump running, then it should show up in the electric bill.
Your electric bill usually gives you the reading for each month for the last 12 months. Read the meter and compare the kWhr per day since the last reading date (shown on your bill) with the kWhr/day for the previous month and for the month a year ago.
It take a lot of electricity to heat your well significantly. If that is the problem, you will have a BIG bill.
On the other hand, if a geothermal source is heating your water you can use it to heat your house and save on fuel next winter.