- Board Adopts Final Amendments to General Use Water Quality Standards for Dissolved
Oxygen
On January 24, 2008, the Illinois Pollution Control Board adopted final amendments to Illinois’
dissolved oxygen (DO) general use water quality standards (35 Ill.
- Adm.
- Code 302.206 (R04-25).
- At the suggestion of the Joint Committee on Administrative Rules, the Board made several
minor changes to the second-notice amendments.
- The new rules significantly improve upon the old DO standards by accounting for the natural
variability of DO and organisms in Illinois waters, focusing protection when and where it is
needed most.
- Additionally, the amendments designate stream segments
(approximatel...
Board Adopts Final Amendments to General Use Water... 
