Which category of technology-based effluent limits applies to toxic pollutants?

• A. BPT
• B. BCT
• C. NSPS
• D. BAT

Answer: (D)

For toxic pollutants, the technology-based effluent limit is Best Available Technology, economically achievable. This standard requires facilities to implement the most effective treatment technologies that are realistically feasible in terms of cost, with the goal of minimizing or eliminating the discharge of toxic substances. It is designed to address hazards posed by toxic and non-conventional pollutants, and it tends to be more stringent than limits applied to conventional pollutants.

Conventional pollutants are typically regulated under other technology-based standards, such as those developed for conventional pollutants, and new-source standards apply to facilities built after certain dates. But for toxic pollutants, the BAT framework is the applicable technology-based approach, reflecting the priority of reducing hazardous discharges.