In the EPA pretreatment program, what two types of categorical standards are utilized?

The correct response identifies the two types of categorical standards utilized in the EPA pretreatment program as concentration-based and production-based standards.

Concentration-based standards limit the amount of specific pollutants that can be discharged based on their concentration in the wastewater. This approach ensures that the level of harmful substances is kept within safe limits to protect public health and the environment.

Production-based standards, on the other hand, set limitations based on the volume of production rather than just the concentration of pollutants. This approach recognizes that larger production operations may generate more wastewater, and therefore, their standards are designed to account for the scale of operations while still ensuring compliance with environmental regulations.

These standards are essential in the pretreatment program as they guide industries in managing their wastewater discharge to comply with environmental regulations, thereby protecting treatment facilities and the overall environment. The other options presented do not accurately reflect the types of standards recognized in the pretreatment program's regulatory framework, thus highlighting why concentration-based and production-based standards are the correct choice.