N.J. Stat. § 13:1E-122
The tariffs established pursuant to this act shall not be levied upon the collectors or haulers of solid waste for that portion of the solid waste generated by the Federal Government or agencies thereof. The exemption from tariffs shall apply only to solid waste disposed of pursuant to contracts in effect prior to the effective date of this act. In order to qualify for an exemption from the new tariff schedule, a hauler shall certify to the board that the contract in question involves solid waste generated by the Federal Government or agencies thereof and was in effect prior to the effective date of this act. All solid waste to be disposed of pursuant to contracts which are entered into, or renewed, on or after the effective date of this act shall be subject to the provisions thereof.
N.J.S. § 13:1E-122