Regulations last checked for updates: Jan 18, 2025

Title 40 - Protection of Environment last revised: Dec 30, 2025
All TitlesTitle 40Chapter IPart 265Subpart FFAppendix Appendix III - Appendix III to Part 265—EPA Interim Primary Drinking Water Standards
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Appendix Appendix III - Appendix III to Part 265—EPA Interim Primary Drinking Water Standards
Parameter Maximum level (mg/l)
Arsenic0.05
Barium1.0
Cadmium0.01
Chromium0.05
Fluoride1.4-2.4
Lead0.05
Mercury0.002
Nitrate (as N)10
Selenium0.01
Silver0.05
Endrin0.0002
Lindane0.004
Methoxychlor0.1
Toxaphene0.005
2,4-D0.1
2,4,5-TP Silver0.01
Radium5 pCi/1
Gross Alpha15 pCi/1
Gross Beta4 millirem/yr
Turbidity1/TU
Coliform Bacteria1/100 ml

[Comment: Turbidity is applicable only to surface water supplies.]

authority: 42 U.S.C. 6905,6906,6912,6922,6923,6924,6925,6935,6936,6937,and
source: 45 FR 33232, May 19, 1980, unless otherwise noted.
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