---
kind: "section"
citation: "40 C.F.R. § 257.4"
title: "40"
number: "257.4"
heading: "Effective date."
url: "https://uscodex.org/cfr/40/257.4"
---

# §257.4. Effective date.


These criteria become effective October 15, 1979.


## Notes

### Authority

Authority: 42 U.S.C. 6907(a)(3), 6912(a)(1), 6927, 6944, 6945(a) and (d); 33 U.S.C. 1345(d) and (e).

### Source

Source: 44 FR 53460, Sept. 13, 1979, unless otherwise noted.