OL- 109.5 - Laboratory Procedures for Microbiology
(Lab for Microbiology)
The EPA has indicated that there is no safe level for Coliform Bacteria. Therefore:
The MCL for COLIFORM BACTERIA IS: ZERO (0) under the Presence-Absence Rule.
- Multiple Tube Fermentation (MTF) Technique utilizing 5 tubes of 20 ml. Sample each or 10 tubes of 10 ml. sample each.
- Presence-Absence (P-A) Coliform Test utilizing a single 100 ml. sample volume
- Membrane Filter (MF) Technique utilizing a 100 ml. filter volume.
- Minimal Media ONPG-MUG or Autoanalysis Colilert System).