Water Quality-Based Effluent Limits
Chapter 6Water 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.
The CWA describes various uses of waters that are considered desirable and should be protected. These uses include public water supply, recreation, and propagation of fish and wildlife. The States are free to designate more specific uses (e.g., cold water aquatic life, agricultural), or to designate uses not mentioned in the CWA, with the
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