- PWSID
- SC1020002
- State
- South Carolina
- System type
- community water system (CWS)
- Population served
- 22,592
- City
- Johns Island
- Counties
- Charleston County
- Primary source water
- surface water (purchased)
- UCMR 5 sampling
- 2025-01-06 to 2025-10-01 · 1 entry point(s) · water types: SW
- Service-area boundary
- EPA-modeled (Random Forest) — approximate: estimated by EPA with a statistical model, not a surveyed service area
PFOS 1–3 × its limit highest single result
PFOS 1–3 × its limit worst entry-point average
Open on the South Carolina map · All South Carolina systems · All results
These are monitoring results collected under EPA's Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) at entry points, where treated water enters the distribution system; they are not tap-water samples. They are not compliance determinations: compliance with EPA's 2024 PFAS limits is judged on running annual averages of compliance monitoring, required from 2029, so a single UCMR 5 result at or above a limit is not a violation. “< MRL” means the compound was not quantified at EPA's minimum reporting level; it does not mean zero.
Water purchased from
- Charleston Water System (Sc1010001) (SC1010001)
Seller's highest results: PFOA 4.7 ppt · PFOS 6.5 ppt · HI 0.002 · detected: PFBS;PFHxA;PFOA;PFOS;PFPeA
Seller results are the seller's own entry-point samples, not measurements of this system's water. This system's own samples (below) may reflect purchased water, its own sources, or both.
Compared with EPA's 2024 values
| Highest single result | Worst entry-point average* | Limit | |
|---|---|---|---|
| PFOA (ppt) | 5.4 | 4.92 | 4 |
| PFOS (ppt) | 8.5 | 7.2 | 4 |
| Hazard Index | 0.002 | 0.002 | 1.0† |
“<MRL” = every result for the compound was below its reporting limit. * Mean of all samples at each entry point with non-detects = 0 (EPA compliance convention; the Hazard Index also uses non-detects = 0); a screening comparison, not a formal running annual average. † Rescission proposed May 2026. PFOA/PFOS MCL 4 ppt (2024 NPDWR, in effect). PFHxS, PFNA, HFPO-DA (10 ppt each) and the Hazard Index (1.0) are 2024 NPDWR values; EPA proposed rescinding them on 18 May 2026 (comment period closed 20 Jul 2026).
No South Carolina PFAS drinking-water standard in effect or proposed as of 2026-10-17: No state PFAS drinking-water standard; H. 3116 and H. 5572 (2025-26) pending, not enacted.
Sampling history
Sampled 2025-01-06 to 2025-10-01 · 1 entry point(s) · water types: SW · 4 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2025-01-06 | Charleston CPW - Connection (SW) | SE1 | 4.2 | 6.4 | 0.002 | PFHxA 4.1, PFPeA 4.4 |
| 2025-04-22 | Charleston CPW - Connection (SW) | SE2 | 5.1 | 6.7 | 0.002 | PFHxA 4.3, PFPeA 4.8 |
| 2025-07-24 | Charleston CPW - Connection (SW) | SE3 | 5 | 8.5 | 0.002 | PFHxA 4.2, PFPeA 5.2 |
| 2025-10-01 | Charleston CPW - Connection (SW) | SE4 | 5.4 | 7.2 | 0.002 | PFHxA 4.9, PFPeA 5.6 |
“<4” = not detected at the reporting limit shown; “n/a” = not analyzed in that sample. Highlighted = at or above the 4 ppt MCL. HI computed per sample with non-detects as 0. Other detections lists every other quantified compound (lithium in µg/L).
All results by entry point
119 results. Each column is one sampling visit (date and UCMR 5 sample event). A number is a measured concentration; “< 4” = below the minimum reporting level shown; “–” = not analyzed in that visit. PFAS in ppt (ng/L); lithium in µg/L.
Charleston CPW - Connection facility 10108 · sample point P10108 · surface water
| Compound | MRL | 2025-01-06 SE1 | 2025-04-22 SE2 | 2025-07-24 SE3 | 2025-10-01 SE4 |
|---|---|---|---|---|---|
| PFBS | 3 ppt | 3.9 | 4.2 | 4.4 | 4.5 |
| PFHxA | 3 ppt | 4.1 | 4.3 | 4.2 | 4.9 |
| PFOA | 4 ppt | 4.2 | 5.1 | 5 | 5.4 |
| PFOS | 4 ppt | 6.4 | 6.7 | 8.5 | 7.2 |
| PFPeA | 3 ppt | 4.4 | 4.8 | 5.2 | 5.6 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| 6:2 FTS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 8:2 FTS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 | < 2 | < 2 |
| ADONA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| HFPO-DA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| NEtFOSAA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| NFDHA | 20 ppt | < 20 | < 20 | < 20 | < 20 |
| NMeFOSAA | 6 ppt | < 6 | < 6 | < 6 | < 6 |
| PFBA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| PFDA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFDoA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFEESA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFHpA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFHpS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFHxS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFPeS | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 | < 2 | < 2 |
| lithium | 9 µg/L | < 9 | < 9 | – | < 9 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFBS | 4 | 100% | 4.5 2025-10-01 | 4.25–4.25 | 4.2 | 4.4 | 4.5 | 4.5 |
| PFHxA | 4 | 100% | 4.9 2025-10-01 | 4.38–4.38 | 4.2 | 4.3 | 4.9 | 4.9 |
| PFOA | 4 | 100% | 5.4 2025-10-01 | 4.92–4.92 | 5 | 5.1 | 5.4 | 5.4 |
| PFOS | 4 | 100% | 8.5 2025-07-24 | 7.2–7.2 | 6.7 | 7.2 | 8.5 | 8.5 |
| PFPeA | 4 | 100% | 5.6 2025-10-01 | 5–5 | 4.8 | 5.2 | 5.6 | 5.6 |
Never detected (25): 11Cl-PF3OUdS, 4:2 FTS, 6:2 FTS, 8:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFBA, PFDA, PFDoA, PFEESA, PFHpA, PFHpS, PFHxS, PFMBA, PFMPA, PFNA, PFPeS, PFTA, PFTrDA, PFUnA, lithium.
Left-censored Kaplan–Meier statistics (Helsel 2005; Helsel & Lee 2006, NADA for R). Units: ppt; lithium µg/L. Each compound has one reporting limit, so the Kaplan–Meier mean equals the upper mean bound (non-detects at the MRL); the lower bound sets non-detects to 0. “<MRL” = the percentile falls below the reporting limit and cannot be estimated. These describe this system's UCMR 5 samples, not population estimates.
Sources
- EPA UCMR 5 occurrence data text files (UCMR5_All.txt; samples 2023-01-09 to 2026-06-15; data summary dated Jul 2026)
- EPA SDWIS via ECHO SDWA downloads, quarter 2026Q3
- EPA Public Water System Service Areas v3 (Mar 2026)
- US Census Bureau cartographic boundary counties 1:500k, 2024
- EPA/USGS NHDPlus V2 (medium resolution) flowlines, Strahler order 2+
Data build 04c4b5704fe9 · 2026-10-18T04:07Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.