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How do technology-based effluent limits affect the need for water-quality based effluent limits (WQBELs) in permits?

April 26, 2017affect based effluent limits permits technology-based water-quality wqbels

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How do technology-based effluent limits affect the need for water-quality based effluent limits (WQBELs) in permits?

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This question is not entirely specific to nutrients, and therefore, is answered the same as for any other water quality criteria. Water quality-based effluent limitations are needed where technology-based effluent limitations are not stringent enough to meet applicable water quality standards. Refer to 40 CFR 122.44(d) and Chapter 6 of the NPDES Permit Writers’ Manual [PDF – 222 KB – 28 pp] for more information on WQBELs.