U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
(a) MCLGs for the following contaminants are as indicated:
| Contaminant | MCLG |
|---|---|
| (1) | zero |
| (2) Viruses | zero |
| (3) | zero |
| (4) Total coliforms (including fecal) | zero |
| coliforms and | |
| (5) | zero |
| (6) | 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.
