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Green Plumbing

Category - Caring for Our Water

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All of the following are categories of regulated contaminants for US drinking water except:

Microorganisms
Disinfectants
Inorganic Chemicals
Sand and grit

Explanation

Answer: D - Sand and grit are removed during the water treatment process and do not necessitate additional oversight and regulation as drinking water contaminants. The other three responses, as well as disinfectant byproducts, organic chemicals, and radionuclides are all contaminants subject to regulation.

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