涉及到对成本的考虑，法令规定常规污染物“最佳控制技术”应该包括：（1）“要考虑达到减污所用成本与污水减少之后所获利益之间的合理性”；

• Concerning cost considerations, the statute provides that BCT shall include: (1) "consideration of the reasonableness of the relationship between the costs of attaining a reduction in effluents and the effluent reduction benefits derived";