DON'T DUMP Most catch basins in Boston connect to stormdrains that discharge the runoff to the nearest brook, river, or Boston Harbor. Substances carelessly spilled, onto our streets or directly into a catch basin can pollute Boston Harbor, the Charles, Neponset and Mystic Rivers. Please keep chemicals, pet waste and litter OUT of Boston's storm drains! LITTER Paint PET WASTE Oil Boston Water and Sewer Commission WE ARE ALL CONNECTED Let's Protect Boston's Waterways DON'T DUMP Most catch basins in Boston connect to stormdrains that discharge the runoff to the nearest brook , river , or Boston Harbor . Substances carelessly spilled , onto our streets or directly into a catch basin can pollute Boston Harbor , the Charles , Neponset and Mystic Rivers . Please keep chemicals , pet waste and litter OUT of Boston's storm drains ! LITTER Paint PET WASTE Oil Boston Water and Sewer Commission WE ARE ALL CONNECTED Let's Protect Boston's Waterways