NOV ~82004Re: Proposed amendments to dissolved oxygen standard (R04-25) STATE OF ~LL~NU~l)orothy Gunn, Clerk Poflulion Controi doe.
The current Illinois standard for
dissolved oxygen follows U.S.
Environmental Protection Agency guidelines and past scientific studies do not
support a lower standard.
Low dissolved, oxygen levels in the Fox
River will also negatively impact fish species that spawn in late summer, and sportfish such as smallmouth bass aresensitive to low dissolved oxygen levels.
In February 2004, over 150,000 residents in Aurora were recommended to boil their water.
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