- Board Sends to First Notice Proposed Amendments to General Use Water Quality
Standards for Dissolved Oxygen
The Illinois Pollution Control Board, on July 12, 2007, adopted for first notice proposed
amendments to Illinois’ general use water quality standards for dissolved oxygen (DO) (35 Ill.
- Adm.
- Code 302.206, and is assigned docket number R04-25.
- The proposal divides the year into an “early
life stages” season (March through July) and an “other life stages” season (August through
February).
- The “early life stages” of fish (egg, embryo, larval, and recently-hatched juvenile) are
more sensitive to low DO concentrations than later juvenile and adult stages and therefore
warrant g...