In reference to hazardous substances, which code relates to the Clean Water Act?

The Clean Water Act (CWA) is primarily concerned with regulating the discharge of pollutants into the waters of the United States. The correct code that specifically relates to this act is found in Title 40 of the Code of Federal Regulations, Section 110, which addresses the discharge of oil and hazardous substances. This regulation outlines the requirements for reporting oil spills and the potential impacts of discharges on navigable waters, making it a critical element in the framework that governs water protection under the CWA.

Other codes mentioned do not pertain to the Clean Water Act. For instance, the code related to hazardous waste management is 40 CFR 261.3, which defines what constitutes hazardous waste but does not specifically address water regulations. The code for hazardous materials regulations in transportation is 49 CFR 171.8, and 40 CFR 172.101 pertains to the listing of hazardous materials for transport. Therefore, the relevance of the Clean Water Act is clearly captured in 40 CFR 110, making this choice the appropriate one regarding regulations associated with hazardous substances and water protection.