(a) MCLGs for the following contaminants are as indicated:
| Contaminant | MCLG | 
|---|---|
| (1) Giardia lamblia | zero | 
| (2) Viruses | zero | 
| (3) Legionella | zero | 
| (4) Total coliforms (including fecal) | zero | 
| coliforms and Escherichia coli | |
| (5) Cryptosporidium | zero | 
| (6) Escherichia coli (E. coli) | zero | 
(b) The MCLG identified in paragraph (a)(4) of this section is applicable until March 31, 2016. The MCLG identified in paragraph (a)(6) of this section is applicable beginning April 1, 2016.
[78 FR 10347, Feb. 13, 2013]