Don't pour it into a storm sewer or anywhere it can reach a natural water supply. Best option is to discharge it into a municipal sanitary sewer. This is especially important if you live near any body of water that can get contaminated. And yes, your little bit of salt water can carry living materials that may impact the environment. Macro algae in Tampa Bay, for example, is a big issue, and virtually entirely on the shoulders of the marine hobbyists.
If you really want to reuse it, you can filter it, remove the phosphates and nitrates, use ozone and ultraviolet to kill any pathogens and then balance any missing minor elements and reuse it in your tank.
In Martin Moe's book, Breeding the Orchid Dottyback, Pseudochromis Fridmani: An Aquarist's Journal he details what he did with NSW. You could do something similar, but would have to figure out a way to remove the Po4 and No3.
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