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643 South Carolina water systems have inventoried 2,040,969 service lines for EPA. 7,999 (0.4%) are confirmed lead and 349,307 (17%) are still of unknown material. Below: every large or city-linked South Carolina utility ranked by lead lines.
South Carolina water systems reported 7,999 lead service lines and 11,251 galvanized lines requiring replacement as of Q2 2026 — 0.4% of the 2,040,969 lines inventoried and 0.4% of the national lead total, ranking #22 of 51. CHARLESTON WATER SYSTEM (SC1010001) reports the most in the state (6,504).
CHARLESTON WATER SYSTEM (SC1010001) (6,504).
Find your utility in the table below, then check its published service line inventory (most utilities post an address-lookup map) or call the number on your water bill. Utilities must notify customers whose line is lead, galvanized-requiring-replacement or unknown. You can also test the pipe entering your home: lead is soft, dull gray, non-magnetic and turns shiny when scratched.
Under EPA's Lead and Copper Rule Improvements, systems must replace lead and galvanized-requiring-replacement lines within 10 years starting in 2027; systems with very high counts can receive longer deadlines. Ask your utility for its replacement plan and whether it covers the homeowner-owned portion.
Use a filter certified to NSF/ANSI 53 for lead for drinking and cooking, flush the tap after water has sat for hours, never use hot tap water for drinking or infant formula, and confirm your actual level with a certified lab test.
Source: EPA SDWIS Service Line Inventory, Q2 2026 snapshot (updated 2026-08-18). Counts are service lines, not people.
A certified mail-in lab test shows exactly what's in your water — lead plus dozens of other contaminants — with EPA-grade accuracy. Know your real levels before spending on a filter.
Certified lab · results in days
Community systems serving 50,000+ people plus systems linked to a city report on this site (18 shown). State totals above include every reporting system.
| # | Water system | Status | Lead | GRR | Unknown | Total lines | City report |
|---|---|---|---|---|---|---|---|
| 1 | CHARLESTON WATER SYSTEM (SC1010001) SC1010001 · 327,422 served | Lead service lines present | 6,504 | 2 | 65,064 | 134,896 | |
| 2 | GSW&SA (SC2620004) SC2620004 · 252,840 served | Many lines still unverified | 0 | 0 | 47,216 | 121,861 | |
| 3 | DARLINGTON COUNTY W&SA (SC1620001) SC1620001 · 52,288 served | Many lines still unverified | 0 | 0 | 15,285 | 19,578 | |
| 4 | AIKEN CITY OF (SC0210001) SC0210001 · 51,533 served | Lead service lines present | 0 | 1 | 12,276 | 22,216 | |
| 5 | LANCASTER COUNTY W&SD (SC2920001) SC2920001 · 79,107 served | No lead service lines reported | 0 | 0 | 9,265 | 39,319 | |
| 6 | FLORENCE CITY OF (SC2110001) SC2110001 · 79,745 served | Lead service lines present | 0 | 518 | 8,632 | 34,355 | |
| 7 | BCWSA SANGAREE W/D (0820002) SC0820002 · 95,345 served | Many lines still unverified | 0 | 0 | 8,408 | 8,408 | |
| 8 | GREENWOOD CPW (2410001) SC2410001 · 52,022 served | No lead service lines reported | 0 | 0 | 1,919 | 24,859 | |
| 9 | GREER CPW (SC2310005) SC2310005 · 54,024 served | Lead service lines present | 0 | 1,607 | 1,134 | 24,540 | |
| 10 | COLUMBIA CITY OF (SC4010001) SC4010001 · 354,068 served | No lead service lines reported | 0 | 0 | 895 | 161,692 | |
| 11 | GREENVILLE WATER (SC2310001) SC2310001 · 426,057 served | No lead service lines reported | 0 | 0 | 0 | 194,066 | |
| 12 | SPARTANBURG WATER SYSTEM (SC4210001) SC4210001 · 166,364 served | No lead service lines reported | 0 | 0 | 0 | 68,276 | |
| 13 | BJW&SA (SC0720003) SC0720003 · 164,829 served | No lead service lines reported | 0 | 0 | 0 | 65,130 | |
| 14 | MT PLEASANT WATER WORKS (1010002) SC1010002 · 91,500 served | No lead service lines reported | 0 | 0 | 0 | 41,611 | |
| 15 | ROCK HILL CITY OF (SC4610002) SC4610002 · 89,850 served | No lead service lines reported | 0 | 0 | 0 | 75,410 | |
| 16 | SJWD MIDDLE TYGER WTP (SC4220006) SC4220006 · 89,531 served | No lead service lines reported | 0 | 0 | 0 | 34,157 | |
| 17 | SUMMERVILLE CPW (SC1810003) SC1810003 · 81,750 served | No lead service lines reported | 0 | 0 | 0 | 27,679 | |
| 18 | SUMTER CITY OF (SC4310001) SC4310001 · 53,070 served | No lead service lines reported | 0 | 0 | 0 | 28,090 |
A lead or unknown service line means lead can enter water after it leaves the treatment plant, so city-level test results understate what reaches your tap. Filter drinking and cooking water with an NSF/ANSI 53 lead-certified system, and see the lead in drinking water guide or South Carolina city water reports.
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