Dorchester County, SC
The federal environmental record for Dorchester County (population 169,833): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
2
federal cleanup sites
4
PFAS-detecting water systems
16
TRI facilities
38
open tank releases
Drinking water: PFAS testing
Public water systems serving Dorchester with at least one PFAS detection under UCMR5. The federal limit for PFOA and PFOS is 4 ng/L; EPA proposed in May 2026 to rescind the limits for the other compounds, which are shown for information.
| System | Highest results | Reading |
|---|---|---|
| SUMMERVILLE CPW (SC1810003) SC1810003 | PFOS: 8.1 ng/L PFPeA: 6.6 ng/L PFOA: 6.2 ng/L | above final limit |
| DCWA KNIGHTSVILLE (1820001) SC1820001 | PFOS: 8.1 ng/L PFPeA: 7.2 ng/L PFOA: 6.5 ng/L | above final limit |
| DCWS ASHLEY PHOSPHATE (1820008) SC1820008 | PFOS: 7.4 ng/L PFOA: 6.4 ng/L PFPeA: 6 ng/L | above final limit |
| DCWA CALOMET VALLEY (1850009) SC1850009 | PFBA: 7 ng/L PFOS: 6.7 ng/L PFPeA: 6.7 ng/L | above final limit |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
16 facilities in Dorchester filed TRI reports for 2024, totalling 463k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| SPORTSMAN BOAT MANUFACTURING INC. | SUMMERVILLE | Styrene, Methyl methacrylate | 160k lb |
| SCOUT BOATS INC | SUMMERVILLE | Styrene, Methyl methacrylate | 134k lb |
| KEY WEST BOATS INC. PLANT 1 (RIDGEVILLE) | RIDGEVILLE | Styrene, Methyl methacrylate | 90k lb |
| KEY WEST BOATS INC. PLANT 2 (SUMMERVILLE) | SUMMERVILLE | Styrene | 24k lb |
| ARGOS CEMENT HARLEYVILLE PLANT | HARLEYVILLE | Ammonia, Manganese And Manganese Compounds | 21k lb |
| CUTTING EDGE COMPOSITES | SUMMERVILLE | Styrene | 19k lb |
| GIANT CEMENT CO | HARLEYVILLE | Methanol, Dichloromethane | 7k lb |
| ROBERT BOSCH LLC | NORTH CHARLESTON | Chromium, Copper | 6k lb |
| RESONAC GRAPHITE AMERICA INC | RIDGEVILLE | Polycyclic aromatic compounds, Phenanthrene | 3k lb |
| AVOCA LLC | SUMMERVILLE | Methanol | 173 lb |
| JAMES HARDIE BUILDING PRODUCTS SUMMERVILLE | SUMMERVILLE | Lead | 11 lb |
| KNIGHT REDI-MIX INC. - PLANT 4 | SUMMERVILLE | Lead compounds | 0 lb |
| VAN SMITH CONCRETE CO JEDBURG PLT | SUMMERVILLE | Lead | 0 lb |
| THOMAS CONCRETE SUMMERVILLE | SUMMERVILLE | Lead And Lead Compounds | 0 lb |
| BRITELINE EXTRUSIONS INC | SUMMERVILLE | - | 0 lb |
| LEIDOS SECURITY DETECTION & AUTOMATION INC. | LADSON | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 261 tank facilities in Dorchester: 189 tanks in service and 537 closed. 201 fuel releases are on record, of which 38 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Dorchester as Zone 3, the lowest predicted indoor radon (under 2 pCi/L average). Radon and air quality are covered in depth on lung.com.
The record for one specific address
County figures blur what matters: distance. The Address Environmental Report runs these same federal datasets against one address and reports every site, tank, polluter and water result around it, with distances, in about a minute.
Get the report - $39All federal cleanup sites on file
The wider Superfund enterprise inventory (SEMS) for Dorchester, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- DONWAL SITESUMMERVILLE
- JOHNSON BRONZE COSUMMERVILLE