Where can I have my well water sample speciated (differentiated) for arsenic 3 and arsenic 5 concentrations?
Inorganic arsenic occurs naturally as arsenic 3 and arsenic 5. Arsenic 3 is significantly more difficult to remove from water than arsenic 5. Therefore, if the total arsenic concentration in your well water exceeds the public drinking water standard, you should consider having a sample tested for arsenic speciation in order to select a treatment option that will remove a sufficient amount of arsenic to produce finished water that meets the standard. See MassDEP’s Certified Laboratories That Test For Arsenic Speciation web page.