Our Sewer Service Area

Charleston Water System provides direct retail sewer service for 50,000 accounts, mostly within the City of Charleston. We also serve unincorporated areas in West Ashley and parts of Johns Island within the urban growth boundary.

Charleston Water System has two wastewater treatment plants: The Plum Island Treatment Plant, our primary plant, which has a permitted capacity of 36 million gallons per day (mgd), and the Daniel Island Treatment Plant, which is used for pre-treatment and has a permitted capacity of 1 mgd.

Searchable Service Area Map
To find out if a home, business, or vacant lot is in our water and/or sewer service area, view our searchable map and enter an address or TMS number.

Service Availability for New Development
To find out if water and/or sewer service is available for a property, please complete the Request for Service Availability Letter form

Wholesale Purchased Treatment
In addition to our retail service, Charleston Water System treats wastewater from Folly Beach, Hollywood, Meggett, Ravenel, and the James Island Public Service District on a wholesale basis. However, we do not own or operate the sewer systems in these areas.