It is against the law to pump chlorinated pool water into the storm drain system; this includes backwash water. However, with permission, Mount Pleasant Waterworks (MPW) may accept pool water into the sanitary sewer system. To request to discharge pool water into the sewer, you can reach MPW's Customer Service Center at (843) 884-9626. Customer Service personnel will need to know the dimensions of your pool and general sewer discharge location. If you are draining the de-chlorinated water from the pool (not the filter backwash) - this can be sent to the public storm drain - try to avoid pumping right before, during, or after rain events! For more information, please contact our Stormwater Office at (843) 856-2157.