Code of Federal Regulations > Title 40 > Chapter I > Part 118

Regulations last checked for updates: Jul 07, 2025

Title 40 - Protection of Environment last revised: Nov 07, 2025

Appendix Appendix B -

Category	RQ (lbs.)	Endpoints for public receptors LD50			Endpoints for fish, wildlife and sensitive environments using 96-hour LC50
		Mammalian toxicity (oral) (mg/kg)		10% (mg/kg)	Aquatic toxicity (mg/liter)		10% (mg/L)
		Lower	Upper	10% (mg/kg)	Lower	Upper	10% (mg/L)
X	1	0	0.1	0.01	0	0.1	0.01
A	10	0.1	1	0.1	0.1	1	0.1
B	100	1	10	1	1	10	1
C	1,000	10	100	10	10	100	10
D	5,000	100	500	50	100	500	50

authority: 33 U.S.C. 1251

source: 89 FR 21955, Mar. 28, 2024, unless otherwise noted.