PurityMap
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Updated 2026-09-16
County water report

Dorchester County Water Quality

Dorchester County, South Carolina: one city report built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

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Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

Perfluorooctanesulfonic acid (PFOS)SUMMERVILLE CPW (SC1810003)4.0 ng/L federal MCL (2024) · US EPA8.1 ng/L
Perfluorooctanoic acid (PFOA)SUMMERVILLE CPW (SC1810003)4.0 ng/L federal MCL (2024) · US EPA6.2 ng/L
Lead (90th percentile)SUMMERVILLE CPW (SC1810003)15 µg/L federal action level · US EPA0.3 µg/L
Perfluorobutanesulfonic acid (PFBS)SUMMERVILLE CPW (SC1810003)2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPA4.4 ng/L
Perfluorohexanoic acid (PFHxA)SUMMERVILLE CPW (SC1810003)400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLE5.9 ng/L
Perfluorobutanoic acid (PFBA)SUMMERVILLE CPW (SC1810003)No federal or state limit; shown for transparency5.1 ng/L
Perfluoropentanoic acid (PFPeA)SUMMERVILLE CPW (SC1810003)No federal or state limit; shown for transparency6.6 ng/L
24 substances tested, none detected in this systemShow

Tested in this system: SUMMERVILLE CPW (SC1810003)

  • 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
  • 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
  • 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
  • 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
  • Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
  • Lithium
  • N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
  • N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
  • Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
  • Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
  • Perfluoro-3-methoxypropanoic acid (PFMPA)
  • Perfluoro-4-methoxybutanoic acid (PFMBA)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluoroheptanoic acid (PFHpA)
  • Perfluorohexanesulfonic acid (PFHxS)
  • Perfluorononanoic acid (PFNA)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
1 city

Cities ranked by the records

Showing 1 of 1 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Dorchester County1 of 1 city reports a regulated PFAS above the federal limit
  1. Summerville8.1 ng/L
4.0 ng/L federal MCL · PFOS, ng/LPFAS in South Carolina
Lead

0of 1 city above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in South Carolina
Who supplies the county

Largest water systems

  1. SummervilleSUMMERVILLE CPW (SC1810003) · SC1810003
    81,750 served
Questions

Frequently asked

How does Dorchester County tap water compare across cities?

PurityMap ranks 1 city in Dorchester County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Summerville's main water system: SUMMERVILLE CPW (SC1810003) · PWSID SC1810003 · Purity Score 57 (Fair) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Dorchester County cities have PFAS above the federal limit?

1 city of 1 had at least one regulated PFAS (PFOA, PFOS or PFHxS) measured above the 2024 federal limit in EPA's UCMR 5 testing, including Summerville (PFOS 8.1 ng/L). PFAS were detected at any level in 1.

Is there lead in Dorchester County tap water?

Utilities report lead as a 90th-percentile result from home taps. 1 of 1 Dorchester County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

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