35 Ill. Adm. Code 302.525
Radioactivity
Section 302
Section 302.525Â
Radioactivity
Except as provided in Section
302.102, all waters of the Lake Michigan Basin must meet the following
concentrations:
a)Â Â Â Â Â Â Â Â Gross beta concentrations must not exceed 100 picocuries per
liter (pCi/L).
b)Â Â Â Â Â Â Â Â Strontium 90 concentration must not exceed 2 picocuries per
liter (pCi/L).
c)Â Â Â Â Â Â Â Â The annual average radium 226 and 228 combined concentration
must not exceed 3.75 picocuries per liter (pCi/L).