Why might some point sources be unable to meet a water quality based effluent limit?

Frequently Asked Questions

Water quality criteria (and corresponding effluent limits) are intended to protect designated uses such as aquatic life and do not take into consideration the feasibility or costs associated with meeting the criteria. In some cases, meeting the water quality based effluent limit may require millions of dollars in capital investments or complex treatment systems that may be unrealistic for small communities to afford and operate.