Missouri’s Water Quality Standards (WQS), which are defined in Code of State Regulations 10 CSR 20-7.031, describe the desired condition of a body of water and the means by which that condition will be protected or achieved. There are flexibilities built into the WQS, which allow for periodic review and revision of uses, time-limited alteration of criteria, and consideration of site-specific conditions during criteria development. Missouri Revised Statutes section 644.058, RSMo. requires an evaluation of environmental and economic impacts be made when criteria are revised more than 25%.
The water quality standards in state regulations describe the desired condition of a body of water and the means by which that condition will be protected or achieved. The department uses water quality testing parameters to determine the water quality in Missouri. A variance to the water quality standards is possible to allow deviation from meeting a water quality-based effluent limit for dischargers. For more information about variances or a list of variances in process, visit Water Quality Standards Variances.
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