Depends on how much and where its going. If you are connected to city or town sewers then IMO its fine. If you have septic then there are a few hazards to be aware of. First is typically septic systems are made of concrete and salt eats concrete. Small quanties of salt water prob wont harm much, but long term you may have issues. And your leach field will suffer die off as salt kills everything so if there is grass or what ever growing above it will prob die.