---
kind: "section"
citation: "40 C.F.R. § 143.3"
title: "40"
number: "143.3"
heading: "Secondary maximum contaminant levels."
url: "https://uscodex.org/cfr/40/143.3"
---

# §143.3. Secondary maximum contaminant levels.


The secondary maximum contaminant levels for public water systems are as follows:


## Notes

### Amendments

[44 FR 42198, July 19, 1979, as amended at 51 FR 11412, Apr. 2, 1986; 56 FR 3597, Jan. 30, 1991]

### Authority

Authority: 42 U.S.C. 300f et seq.

### Source

Source: 44 FR 42198, July 19, 1979, unless otherwise noted.

### Amendments

[44 FR 42198, July 19, 1979, as amended at 51 FR 11412, Apr. 2, 1986; 56 FR 3597, Jan. 30, 1991]