Which statement best describes the relationship between BPT and ELGs?

Which statement best describes the relationship between BPT and ELGs?

• A. Best Practicable Technology; older basis for effluent limits.
• B. ELGs are unrelated to BPT.
• C. Best Practicable Technology; older basis for effluent limits superseded by ELGs in many categories.
• D. ELGs apply only to air emissions.

Answer: (C)

Best Practicable Technology is the older standard used to set effluent limits, while Effluent Guidelines provide the current, nationally applicable limits for many industrial categories. Over time, ELGs have replaced the BPT basis in many categories because they reflect the best achievable treatment given current technology. So, the statement that BPT is the older basis for effluent limits and that ELGs have superseded it in many categories captures the relationship accurately. ELGs are about wastewater limits, not air emissions, and they are not unrelated to BPT—they’re the updated framework that in many cases overrides the older BPT approach.

Best Practicable Technology is the older standard used to set effluent limits, while Effluent Guidelines provide the current, nationally applicable limits for many industrial categories. Over time, ELGs have replaced the BPT basis in many categories because they reflect the best achievable treatment given current technology. So, the statement that BPT is the older basis for effluent limits and that ELGs have superseded it in many categories captures the relationship accurately. ELGs are about wastewater limits, not air emissions, and they are not unrelated to BPT—they’re the updated framework that in many cases overrides the older BPT approach.