Sulfur water. Eats copper/copper alloys and metals up and wreaks havoc on most everything copper & certain metals, appliances, wiring, piping, crimp rings/fittings, pumps, etc. etc. I’ve seen some extreme cases and not so extreme (where the sulfur smell isn’t very noticeable). Did you check wiring at outlets, switches, etc.? Did you notice a smell? Slightly blackish/tinted water? I’d seriously think about referring it to a water treatment professional and affected areas be evaluated and reparied/replaced accordingly by qualified tradesman.