Regulations last checked for updates: Feb 11, 2026

Title 40 - Protection of Environment last revised: Dec 22, 2026
All TitlesTitle 40Chapter IPart 141Subpart F - Subpart F—Maximum Contaminant Level Goals and Maximum Residual Disinfectant Level Goals
View all text of Subpart F [§ 141.50 - § 141.55]
§ 141.55 - Maximum contaminant level goals for radionuclides.

MCLGs for radionuclides are as indicated in the following table:

Contaminant MCLG
1. Combined radium-226 and radium-228Zero.
2. Gross alpha particle activity (excluding radon and uranium)Zero.
3. Beta particle and photon radioactivityZero.
4. UraniumZero.
[65 FR 76748, Dec. 7, 2000]
authority: 42 U.S.C. 300f,300g,300g,300g,300g,300g,300g,300j,300j,and
source: 40 FR 59570, Dec. 24, 1975, unless otherwise noted.
cite as: 40 CFR 141.55
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