Transcription of Water Quality-Based Effluent Limits
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Water Quality-Based Effluent Limits
Chapter 6 Water Quality-Based EffluentLimitsPermit writers must consider the impact of every proposed surface waterdischarge on the quality of the receiving Water . Water quality goals for a Water bodyare defined by State Water quality standards. A permit writer may find, by analyzingthe effect of a discharge on the receiving Water , that technology-based permit limitsare not sufficiently stringent to meet these Water quality standards. In such cases, theCWA and EPA regulations require development of more stringent, Water quality -basedeffluent Limits (WQBEL) designed to ensure that Water quality standards are met. Inorder to develop effective WQBELs, permit writers must be familiar with State waterquality standards methods for predicting Water quality impacts from discharges, andprocedures for establishing WQBELs.
Water quality standards are composed of three parts: • Use classifications • Numeric and/or narrative water quality criteria • Antidegradation policy. Each of these three components is described below. Use Classification The first part of a State’s water quality standard is a classification system for
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