Disinfection byproducts formed from chlorine/chloramine include which compounds?

• A. Oxygen
• B. Trihalomethanes (THMs), haloacetic acids (HAAs), and NDMA
• C. Nitrogen gas
• D. Sulfates

Answer: (B)

Disinfection byproducts form when chlorine or chloramine reacts with natural organic matter and other precursors in water. The most recognized and commonly monitored byproducts from this chemistry are Trihalomethanes and haloacetic acids, which arise from reactions with organic matter. NDMA is another byproduct that can form under chloramination conditions from certain amine precursors. Oxygen gas, nitrogen gas, and sulfates are not typical disinfection byproducts produced by chlorine or chloramine processes, so they aren’t the expected answer.