Currently we have well water with both sulphur and iron. It took a year before the water treatment specialist" agreed that we had sulphur. We had to replace the anode in the water heater and treat the well with bleach, and put hydrogen peroxide in the water heater. Every now and then I have to turn the water heater temp up to kill off the bacteria, because today's recommended water heater temp of 120 is enough to breed the bacteria but not kill it.
