Treatment options for hydrogen sulfide include aeration, granular activated carbon filtration, and shock (or possible continuous) chlorination to kill the sulfur-producing bacteria. Sulfates are part of naturally occurring minerals contained within soil and rock formations. As water percolates down through the soil, these minerals can dissolve releasing sulfates into groundwater.
Treatment options for sulfates include reverse osmosis, distillation, and ion exchange. The Secondary Maximum Contaminant Level (SMCL) for sulfate in drinking water is 250 milligrams per liter (parts per million) as established by the EPA. Note that the SMCL is a recommended maximum concentration as opposed to a required maximum concentration.