Section 465.430  Action Response to Laboratory Results

a)         For laboratory results concerning samples from public water supplies and their sources, presumptive positive microbiological test results are to be reported to the Illinois Environmental Protection Agency and the community public water supply system as preliminary without waiting for membrane filter verification or multiple tube fermentation (MTF) completion.  After membrane filter verification or MFT completion or both, the adjusted results shall be reported.  The Illinois Environmental Protection Agency and the public water supply shall be notified when results indicate that non-coliforms may have interfered with the total coliform analysis, as described in 40 CFR 141.21(c)(2).

b)         If any sample is fecal coliform- or E. coli-positive, the system shall notify the State by the end of the day when the public water supply system is notified of the test result, unless the public water supply system is notified of the result after the State office is closed, in which case the system shall notify the State before the end of the next business day (see 40 CFR 141.21(e)(1)).

c)         A total coliform-positive result is based on the confirmed phase if the Multiple Tube Fermentation Technique or Presence/Absence (P/A) Coliform Test is used, or the verified test for the Membrane Filter Technique if M-Endo medium or LES Endo agar is used.  No requirement exists to confirm a total coliform-positive result using Colilert, Colisure, MI agar, E*Colite, m-ColiBlue24, Chromocult, Readycult/Fluorocult, Coliscan, or Colitag test.  Also, no requirement exists to confirm and/or verify as such, but if found to be fecal coliform or E. coli-positive, the sample is considered total coliform-positive and fecal coliform/E. coli-positive.

(Source:  Amended at 35 Ill. Reg. 14494, effective August 12, 2011)