Who primarily enforces environmental regulations in the United States?

The Environmental Protection Agency (EPA) is the primary federal agency responsible for enforcing environmental regulations in the United States. Established in 1970, the EPA's mission includes protecting human health and the environment by developing and enforcing regulations based on laws passed by Congress. This involves monitoring pollution levels, regulating emissions, and ensuring compliance with environmental standards.

While state legislatures do play a role in establishing and enforcing environmental rules within their own jurisdictions, they do so under the broader framework set by federal laws and regulations. Environmental activists advocate for stronger protections and may influence policy and public opinion, but they do not enforce regulations themselves. International organizations may address global environmental issues, but they do not have the authority to enforce regulations within the United States. Thus, the EPA stands out as the central authority in this context.