If you need to drain your pool or spa, it is best to discharge the water to a sanitary sewer, since the sanitary sewer system is conveyed to a treatment plant where it is designed to remove most chemicals found in pools and spas.
Limits Apply to Storm Drains
You can discharge pool or spa water to a storm drain only if the water:
Is free of any chemicals in toxic amounts, including but not limited to chlorine, bromine, hydrogen peroxide products, copper, silver, algaecides, fungicides, soda ash, cyanuric acid, and muriatic acid. Pool or spa water treated with an ionizer or mineral purifier may not be discharged to a storm drain. Always consider alternatives to copper algaecides for algae control.
Is free of debris, algae, or vegetation
Is between pH 6.5 and 8.5 (pH 7 is neutral)
Is at a flow rate that does not cause damage to the storm drain system or cause erosion downstream.
Will not increase or decrease the temperature of the nearest creek or stream more than 5°F