Section 504 of the Rehabilitation Act of 1973

Section 504 provides:
No otherwise qualified individual with a disability in the United States, as defined in section 7(20) shall, solely by reason of her or his disability, be excluded from the participation in, be denied the benefits of, or be subjected to discrimination under any program or activity receiving Federal financial assistance or under any program or activity conducted by any Executive agency or by the United States Postal Service.

Section 504 of the Rehabilitation Act is published in the United States Code at 29 U.S.C. §794. 

EPA's Section 504 implementing regulations are published in the Code of Federal Regulations at 40 C.F.R. Part 7 (PDF) (11 pp, 40 K) (Nondiscrimination in Programs Receiving Federal Assistance From the Environmental Protection Agency).

EPA's Civil Rights regulations (40 C.F.R. Part 7) (pdf) (11 pp, 40 K) (Nondiscrimination in Programs Receiving Federal Assistance from the Environmental Protection Agency) implement not only Title VI of the Civil Rights Act of 1964, as amended, but also section 504 of the Rehabilitation Act of 1973, as amended, and Section 13 of the [Clean Water Act] Federal Water Pollution Control Act Amendments of 1972, Public Law 93-500.