Section 302.525  Radioactivity

Except as provided in Section 302.102, all waters of the Lake Michigan Basin must meet the following concentrations:

a)         Gross beta concentrations must not exceed 100 picocuries per liter (pCi/L).

b)         Strontium 90 concentration must not exceed 2 picocuries per liter (pCi/L).

c)         The annual average radium 226 and 228 combined concentration must not exceed 3.75 picocuries per liter (pCi/L).

(Source:  Amended at 47 Ill. Reg. 4437, effective March 23, 2023)