Technically Based Local Limits (TBLL) are developed by which entity?

• A. EPA
• B. Control Authority
• C. POTW Operator
• D. City Council

Answer: (B)

Technically Based Local Limits are site-specific discharge limits that a POTW uses to protect its treatment works from industrial inputs. They’re tailored to what the particular sewer system and treatment plant can reliably treat without causing interference, pass-through, or regulatory issues.

The entity responsible for developing these limits is the Control Authority. This is the regulatory body that issues the POTW’s permit and oversees its pretreatment program, often coordinating with the POTW to determine allowable discharges from industrial users based on the plant’s design, treatment capabilities, and capacity. In short, TBLL are established by the Control Authority to ensure the local system can meet overall permit requirements while accommodating the specifics of the local treatment facility.

The EPA sets federal guidelines, but TBLL themselves are locally developed. The POTW operator implements the permit and runs the facility, but does not set these statutory limits. A City Council typically enacts ordinances, not the technical discharge limits.