印第安纳州美国水务公司（INAWC）在科科莫的地下水处理设施提供了高水平的水处理，其工艺与常规水处理和砷的专门处理相辅相成。各种地下水源中的砷主要以可溶状态存在，以As+3为主。该设施的通风对砷的成分没有显著影响，而高锰酸钾和氯的添加提供了化学氧化，将所有As+3转化为As+5。三氯化铁与自然生成的铁结合，为吸附颗粒态砷提供基质。一旦砷被吸附到铁上，凝固、澄清和过滤过程就提供了从处理过的水中物理去除颗粒砷的必要手段。

Indiana-American Water Company's (INAWC) groundwater treatment facility in Kokomo provides a high level of water treatment using processes that compliment conventional water treatment with specialized treatment for arsenic. Arsenic in the various groundwater sources occurs primarily in a soluble state, with As+3 predominating. Aeration at this facility has no significant effect on the composition of arsenic, while the addition of potassium permanganate and chlorine provides chemical oxidation to convert all the As+3 to As+5. Ferric chloride in combination with naturally occurring iron provides the substrate for adsorption of particulate arsenic. Once the arsenic is adsorbed onto the iron, the processes of coagulation, clarification and filtration provides the means necessary to physically remove particulate arsenic from the treated water.