Ill. Admin. Code tit. 35 § 302.505
Current through Register Vol. 48, No. 49, December 6, 2024
Based on a minimum of five samples taken over not more than a 30-day period, fecal coliform must not exceed a geometric mean of 20 per 100 ml in the Open Waters of Lake Michigan as defined in Section 302.501. The remaining waters of the Lake Michigan Basin must not exceed a geometric mean of 200 per 100 ml, nor may more than 10% of the samples during any 30-day period exceed 400 per 100 ml.
Ill. Admin. Code tit. 35, § 302.505
Amended at 22 Ill. Reg. 1356, effective December 24, 1997