Wyoming Administrative Code
Agency 020 - Environmental Quality, Dept. of
Sub-Agency 0011 - Water Quality
Chapter 1 - WYOMING SURFACE WATER QUALITY STANDARDS
Appendix D - Minimum Dissolved Oxygen Criteria* (mg/L)
| Cold Water Criteria | Class 2C and Warm Water Criteria | |||
| Early Life Stages(1)(2) | Other Life Stages | Early Life Stages(2) | Other Life Stages | |
| 30 Day Mean | n/a(3) | 6.5 | n/a(3) | 5.5 |
| 7 Day Mean | 9.5 (6.5) | n/a(3) | 6.0 | n/a(3) |
| 7 Day Mean Minimum(4) | n/a(3) | 5.0 | n/a(3) | 4.0 |
| 1 Day Minimum(4) | 8.0 (5.0) | 4.0 | 5.0 | 3.0 |
*These limitations apply to Class 1, 2AB, 2B and 2C waters only and in no case shall be interpreted to require dissolved oxygen concentrations greater than 100 percent saturation at ambient temperature and elevation. Criteria derived from: U.S. EPA. 1986. Ambient Water Quality Criteria. EPA 440/5-86-003. National Technical Service, Springfield, VA.
(1)These are water column concentrations recommended to achieve the required inter-gravel dissolved oxygen concentrations shown in parentheses. For species that have early life stages exposed directly to the water column, the figures in parentheses apply.
(2)Includes all embryonic and larval stages and all juvenile forms to 30-days following hatching.
(3)n/a (not applicable).
(4)All minima should be considered as instantaneous concentrations to be achieved at all times.
