The other two answers are ...

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The other two answers are right on the money with UV- however you may want to consider ozone as well - as long as bromide levels are low the DBPs should be low. After ozone, the chlorine residual can be much lower. There are other disinfection methods out there as well such as Filox, a solid-state oxidant but it has nothing near the power of ozone. . The big take away of the Surface Water Treatment Rule is that difficult to inactivate pathogens must be removed by filtration.