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Counties → South Carolina

Charleston County, South Carolina

SDWIS compliance plate

Sheet SC019 · Charleston County 74 sys · 846 viol · #148/3254

VIOL-HIGH · HEALTH-MID · RANK-TOP · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-MID · BOOK-FULL

  • VIOL-HIGH 54.1% flagged
  • HEALTH-MID 29.8% health
  • RANK-TOP #148/3254
  • PHOTO-FINISH ±0.1 pp
  • PFAS-HIGH 100.0% detect
  • SRC-GW GW lead 65%
  • SYS-MID 74 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Georgetown County (+ 0.1 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Charleston County ranks #148 of 3,254 counties by people served, and #2 of 46 counties in South Carolina. See methodology · corpus placement.

Charleston County standing, lower-flagged corpus third

Flagged-system rate 54.1% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 29.8% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 100.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #148 of 3,254 · #2 of 46 in South Carolina.

Flagged-rate neighbourhood around Charleston County

Lowest/highest poles plus in-state counties nearest Charleston County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Horry · lowest Dorchester · near Georgetown · near Lee · highest 26.4% 53.3% 53.6% 54.1% 54.2% 54.5% 100%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

Water Systems

System Name Population Violations PFAS
Charleston Water System (Sc1010001) 327,422 22 Detected
Mt Pleasant Water Works (1010002) 91,500 17 Detected
St John's Water (Sc1020002) 22,592 19 Detected
Kiawah Island Utility (Sc1010008) 9,550 5 Detected
Isle of Palms W/S Comm (Sc1010004) 9,530 32 Detected
Seabrook Island Town of (1010009) 5,939 19 Detected
Folly Beach City of (1010005) 5,086 19 Detected
Sullivans Island Town of (1010003) 2,521 9 -
Lincolnville Town of (Sc1010007) 1,980 114 -
Awendaw Town of (Sc1010504) 713 8 -
E Frierson School (Sc1070115) 281 5 -
St James School (Sc1070143) 240 27 -
Minnie Hughes Elementary (Sc1070124) 227 12 -
Camp Ho Non Wah (Sc1070675) 200 12 -
Cape Romain School (Sc1070140) 198 41 -
Burbage MHP (Sc1060063) 171 33 -
Jericho Trailer Park (1060061) 103 3 -
Jane Edwards Elementary (Sc1070122) 100 6 -
WA Burbage Trailer Park 1 (1060014) 81 38 -
Ems Medic 6/Magistrate Court (1079003) 72 4 -
Dollar General-McClellanville(sc1070008) 60 48 -
Dewees Utilities (Sc1050011) 55 89 -
The Bent Rod (Sc1070236) 50 18 -
Whole Foods Mkt Chas (Sc1080096) 50 0 -
Circle K 2720878 (1070913) 49 2 -
T W Graham Co (Sc1072002) 40 6 -
Windwood Farm Home (Sc1070963) 33 47 -
Berkeley Electric Coop (1030028) 32 6 -
Wadmalaw Island Comm Ctr (Sc1070958) 30 6 -
Deas Restaurant Water System (Sc1072016) 30 0 -
Charleston Tea Garden #1 (Sc1030020) 26 0 -
St James-Santee Fhc Inc (Sc1070006) 26 38 -
Adams Run Civic Center (Sc1070148) 26 37 -
McClellanville Diner (Sc1070234) 26 4 -
Old Post Office Restaurant (Sc1070247) 26 29 -
Scprt-Hampton Plantation (1070600) 26 12 -
Oak Plantation Campground (1070802) 26 5 -
Shree Food Mart (Sc1070915) 26 2 -
Enk 878 (Sc1070974) 26 0 -
Buckshot Restaurant (Sc1072010) 26 11 -
Mt Pleasant Ro Dispensing Sta#1(1080032) 26 0 -
Mt Pleasant Ro Dispensing Sta#2(1080033) 26 0 -
Dewees Island Ro Dis Sta (Sc1080038) 26 0 -
Earth Fare Charleston (Sc1080063) 26 0 -
Whole Food Market/Mt Pleasant (1080065) 26 0 -
Mt Pleasant Ro Dispensing Sta#3(1080066) 26 0 -
Primo-Walmart 3367 (1080067) 26 0 -
Primo-Walmart 1748 (Sc1080068) 26 0 -
Ems Medic 6/Wtr Dispense (Sc1080069) 26 0 -
Primo-Food Lion 1097 (Sc1080076) 26 0 -

Compare beyond South Carolina

Lower-flagged peers for Charleston County

Cross-state counties nearest Charleston County on flagged-system share (54.1%) and cumulative violation count (846). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.