---
kind: "section"
citation: "40 C.F.R. § 142.304"
title: "40"
number: "142.304"
heading: "For which of the regulatory requirements is a small system variance available?"
url: "https://uscodex.org/cfr/40/142.304"
---

# §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)](/cfr/40/1412.md?p=b-15) of the Act.

## Notes

### Source

Source: 63 FR 43848, Aug. 14, 1998, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 300f, 300g-1, 300g-2, 300g-3, 300g-4, 300g-5, 300g-6, 300j-4, 300j-9, and 300j-11.

### Source

Source: 41 FR 2918, Jan. 20, 1976, unless otherwise noted.