What regulation does Secondary Drinking Water Regulation follow?

• A. 40 CFR 141
• B. 40 CFR 136
• C. 40 CFR 142
• D. 40 CFR 143

Answer: (D)

Secondary Drinking Water Regulations are non-health-based standards that focus on how water looks, tastes, and smells, as well as other aesthetic qualities. In federal regulations, these guidelines are written in 40 CFR Part 143, which establishes the National Secondary Drinking Water Regulations (SMCLs). They’re designed to protect consumer acceptance of drinking water rather than to protect against health effects, so they are not federally enforceable in the same way primary standards are. States can adopt these SMCLs as enforceable requirements and utilities often monitor them to keep water appealing to customers. For contrast, health-based, enforceable standards used to protect public health are in 40 CFR Part 141.