The Environmental Protection Agency is the government body tasked with enforcing the laws passed about chemicals, substances, and other materials that affect the environment. The Substance Registry Services (SRS) database collects all of that information, including links to the relevant laws and statutes, in one place.
Nexis Uni includes legal opinions and state and federal regulations, and the Government Publishing Office provides open access to the current Code of Federal Regulations, which govern the U.S.
Not sure which agency regulates a particular topic? Start with USA.gov:
Or start with the regulations and search for the topic.
Where to find articles about the physical effects of lead in drinking water.