CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER D—WATER PROGRAMS (Parts 100–149) > PART 142—NATIONAL PRIMARY DRINKING WATER REGULATIONS IMPLEMENTATION > SUBPART K—Variances for Small System (§142.301 to §142.313) > 142.304—For which of the regulatory requirements is a small system variance available?

142.304—For which of the regulatory requirements is a small system variance available?

(a) A small system variance is not available under this subpart for a national primary drinking water regulation for a microbial contaminant (including a bacterium, virus, or other organism) or an indicator or treatment technique for a microbial contaminant.
(b) A small system variance under this subpart is otherwise only available for compliance with a requirement specifying a maximum contaminant level or treatment technique for a contaminant with respect to which;
(1) a national primary drinking water regulation was promulgated on or after January 1, 1986; and
(2) the Administrator has published a small system variance technology pursuant to Section 1412(b)(15) of the Act.

Code of Federal Regulations

Note to paragraph (b)(1): Small system variances are not available for public water systems above the pre-1986 maximum contaminant level even if subsequently revised. If the Agency revises a pre-1986 maximum contaminant level and makes it more stringent, then a variance would be available for that contaminant, but only up to the pre-1986 maximum contaminant level.