What is the maximum contaminant level of E. coli for recreational waters?
According to IAC (Indiana Administrative Code) 327, the maximum contaminant level for full body contact in recreational waters shall not exceed 235 colonies of E. coli per 100 milliliters in any 1 sample in a 30 day period nor 125 colonies of E. coli per 100 milliliters of sample as a geometric mean based on not less than five 5 samples equally spaced over a 30 day period. The LaPorte County Health Department uses the 235cfu/100mL (colony forming units per 100 milliliters), as its standard for beach closures.
