Notwithstanding any law, order, or regulation to the contrary, after July 1, 1981, no area within the geographic boundaries of the state of Washington may be used by any person or entity as a temporary, interim, or permanent storage site for radioactive waste, except medical waste, generated or otherwise produced outside the geographic boundaries of the state of Washington. This section does not apply to radioactive waste stored within the state of Washington prior to July 1, 1981.