40 C.F.R. § 141.51

Maximum contaminant level goals for inorganic contaminants

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(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.

[50 FR 47155, Nov. 14, 1985, as amended at 52 FR 20674, June 2, 1987; 56 FR 3593, Jan. 30, 1991; 56 FR 26548, June 7, 1991; 56 FR 30280, July 1, 1991; 57 FR 31846, July 17, 1992; 60 FR 33932, June 29, 1995; 66 FR 7063, Jan. 22, 2001]

Notes of Decisions

Cited in 2 cases (1 in the last 5 years), 1997–2021 · leading case: Shalimar Contractors, Inc. v. American States Insurance

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Shalimar Contractors, Inc. v. American States Insurance (1997) almd “1000 (listing lead as an air contaminant); 40 C.F.R. § 141.51 (listing lead as a contaminant under drinking water regulations); 40 C.”

A Community Voice v. Usepa (2021) ca9 “§ 300g-1, 40 C.F.R. § 141.51 (setting maximum contaminant level goal for lead at zero).”

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