If your well water smells like rotten-eggs, you are not alone. Well water odor is a common problem and many homeowners battle stinky well water.
The cause is probably sulfate-reducing bacteria, which typically survive off naturally occurring sulfur in your water and slowly corrode steel parts while generating hydrogen. Sulfate-reducing bacteria are capable of surviving in harsh conditions, like poorly aerated plumbing.
Aeration and/or chlorine treatment utilizing common household laundry bleach has been the most common method in the past to take care of smells from well water. Chlorine however has some undesirable by-products and can leave chlorine tastes and odors.