Federal regulations · Through 2026-08-25 · Newer source version available

40 CFR 141.51: Maximum contaminant level goals for inorganic contaminants.

Where this section sits in the code

Title 40—Protection of Environment
CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
SUBCHAPTER D—WATER PROGRAMS
PART 141—NATIONAL PRIMARY DRINKING WATER REGULATIONS
Subpart F—Maximum Contaminant Level Goals and Maximum Residual Disinfectant Level Goals

(a) [Reserved]

(b) MCLGs for the following contaminants are as indicated:

Contaminant MCLG (mg/l)

Antimony 0.006

Arsenic zero 1

Asbestos 7 Million fibers/liter (longer than 10 µm).

Barium 2

Beryllium .004

Cadmium 0.005

Chromium 0.1

Copper 1.3

Cyanide (as free Cyanide) .2

Fluoride 4.0

Lead zero

Mercury 0.002

Nitrate 10 (as Nitrogen).

Nitrite 1 (as Nitrogen).

Total Nitrate + Nitrite 10 (as Nitrogen).

Selenium 0.05

Thallium .0005

1 This value for arsenic is effective January 23, 2006. Until then, there is no MCLG.

Collected 2026-08-27T02:26:04Z. Source file · JSON