Which agency enforces the manufactured housing regulations?

The US Department of Housing and Urban Development (HUD) is the agency responsible for enforcing manufactured housing regulations. This includes ensuring that manufactured homes meet safety, quality, and energy efficiency standards outlined in the National Manufactured Housing Construction and Safety Standards Act. HUD establishes regulations and oversees compliance, aiming to protect consumers and enhance the overall quality of manufactured housing.

In this context, the other agencies mentioned have different mandates. The US Department of Transportation primarily focuses on laws and regulations regarding transportation, including mobile homes while they're in transit. The Federal Housing Administration deals more with mortgage insurance and financing for housing rather than the construction standards specific to manufactured homes. Similarly, the Environmental Protection Agency is concerned with environmental protection and regulations but does not oversee the manufactured housing industry directly. Therefore, HUD’s direct involvement in setting and enforcing housing standards makes it the correct answer.