South Carolina
Charleston County drinking water quality
73 active public water systems serve 431,366 people in Charleston County. 61 are compliant, 12 had at least one EPA violation in the past three years, 1 is a designated serious violator, and 0 carry a health flag.
Needs attention
Community water systems
15 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Charleston Water System (sc1010001) Charleston |
278,771 | 1 | 0 | |
|
MT Pleasant Waterworks (sc1010002) Mount Pleasant |
91,500 | 0 | 0 | |
|
ST John's Water (sc1020002) Johns Island (sta.) |
22,592 | 0 | 0 | |
|
Kiawah Island Utility (sc1010008) Johns Island (sta.) |
9,550 | 0 | 0 | |
|
Isle of Palms W/s Comm (sc1010004) Isle Of Palms |
9,530 | 1 | 0 | |
|
Seabrook Island Town of (1010009) Seabrook |
5,939 | 3 | 0 | |
|
Folly Beach City of (1010005) Folly Beach |
5,086 | 0 | 0 | |
|
Sullivans Island Town of (1010003) Sullivans Island |
2,521 | 0 | 0 | |
|
Lincolnville Town of (sc1010007) Lincolnville |
1,980 | 1 | 1 | |
|
Awendaw Town of (sc1010504) Awendaw |
713 | 2 | 1 | |
|
Burbage MHP (sc1060063) Ravenel |
171 | 3 | 2 | |
|
Jericho Trailer Park (1060061) Adams Run |
103 | 0 | 0 | |
|
WA Burbage Trailer Park 1 (1060014) Ravenel |
81 | 2 | 1 | |
|
Dewees Utilities (sc1050011) |
55 | 4 | 0 | |
|
Windwood Farm Home (sc1070963) Awendaw |
33 | 2 | 1 |
Non-community systems (58: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (186, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The South Carolina records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.