District of Columbia Code Division V. Local Business Affairs § 32-531.06. Effect on existing employment benefits.

(a) this subchapter shall not diminish the obligation of an employer to comply with any contract, collective bargaining agreement, or any employment benefit program or plan that provides greater paid leave rights to employees than the rights established under this subchapter.

(b) The paid leave requirements under this subchapter shall not be waived for less than 3 paid leave days per calendar year by the written terms of a bona fide collective bargaining agreement; provided, that the paid leave requirements under this subchapter shall not apply to any employee in the building and construction industry covered by a bona fide collective bargaining agreement that expressly waives the requirements in clear and unambiguous terms.