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| Title | Focus on Mixing Zones for Wastewater Discharges | |
| Month-Year Published | January 2000 | |
| Revised on | January 2009 | |
| Online Availability |
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| Short Description |
Mixing zones are areas around treated wastewater discharges where the water quality standards may be exceeded. Mixing zone conditions are described in Washington′s Water Quality Standards (Chapter 173-201A. WAC). The size of the area is small enough that it doesn′t interfere with beneficial uses, such as swimming, drinking and fish habitat. The Department of Ecology (Ecology) allows mixing zones because the concentrations and effects of most pollutants diminish rapidly after discharge, due to dilution. Ecology establishes mixing zones that limit the amount of time the discharge could potentially cause harm to water quality, plants or fish. All states have a mixing zone policy or regulation. Washington′s allowance is one of the most restrictive in the nation. | |
| Publication Number | 00-10-002 | |
| Print Availability |
Not available as a printed document
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| Number of pages | 2 | |
| Keywords | discharge, discharges, fish, mixing zone, plan, quality, standards, waste, wastewater, water, water quality, water quality standards | |
| Related Web Content | Permits - Point Source Pollution | |
This page last updated August 11, 2011
Copyright © Washington State Department of Ecology. See http://www.ecy.wa.gov/copyright.html.
