N.J. Admin. Code § 8:13-2.3
No person shall distribute or sell, offer for sale or have in his or her possession with the intent to distribute or sell any clams which have been harvested from special restricted waters and have not been depurated for at least 48 hours and which do not meet the bacteriological standards set forth under 8:13-2.21. Clams shall be depurated for a minimum of 48 hours, but not longer than 72 hours. Depuration shall be restricted to clams of the species approved by the Department. Only clams harvested from waters approved for this purpose by the Department of Environmental Protection pursuant to 58:24-1 et seq. may be depurated. Clams from other sources may not be stored on the premises of the depuration plant. The depuration plant shall be used for no purpose other than the depuration of clams.
N.J. Admin. Code § 8:13-2.3