The present disclosure refers to systems and methods for remediating a produced water from an oil or gas well. A representative process may comprise optionally purifying and then electrolyzing the produced water to produce at least hydrogen and oxygen; storing, selling, releasing, or converting oxygen to a useful oxygen product; and storing, selling, releasing, or converting hydrogen to a useful hydrogen product and to produce fresh water for beneficial reuse. Alternatively or additionally, the optionally purified produced water may be subjected to steam reformation with methane to produce carbon dioxide and hydrogen which can be used as desired.