National Organic Program (NOP) is a federal regulatory program that develops and enforces consistent national standards for organically produced agricultural products sold in the United States.

NOP also accredits third-party organizations to certify that farms and businesses meet the national organic standards. These certifiers and USDA work together to enforce the standards, ensuring a level playing field for producers and protecting consumer confidence in the integrity of the USDA Organic Seal.

https://www.ams.usda.gov