Well pump comes on constantly even if water isn't being used. The contacts engage about every 30 seconds - what can I do to fix it

Sounds like a leak somewhere, probably a checkvalve. Is your pump above ground or in the well?

If you can turn the water off to your house, then do that and see if the problem stops. If it stops, then the leak is between the tank and the house (unlikely). If it does not stop, then it involves the well.