Community Water System · PWS SC1010009
Seabrook Island Town of (1010009)
Operator location Johns Island, South Carolina - UCMR5 detected 5 PFAS compounds (upper-third PFAS panel (> 4 compounds)) on this PWS; SDWIS lists 19 violations and 5,939 people served.
- 5,939
- People served (this PWS)
- 19
- EPA violations (this PWS)
- 1
- Health-based (this PWS)
- 5 PFAS
- UCMR5 (this PWS)
Seabrook Island Town of (1010009) standing, low SDWIS violation third
UCMR5 detected 5 PFAS compounds - upper-third PFAS panel (> 4 compounds). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 5% is middle-third health share (≤ 23%). UCMR5: upper-third PFAS panel (> 4 compounds). Population rank #6,895 of 29,740 among systems serving 500+.
The verdict
Seabrook Island Town of (1010009) is in the lower third by violation count (19; lower-third violation load (≤ 21 violations)). A low count does not mean the system is unmonitored - monitoring and reporting violations still appear in SDWIS. Population served is large (5,939; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 5% (middle-third health share (≤ 23%)). UCMR5 detected 5 PFAS compounds (upper-third PFAS panel (> 4 compounds)).
- #6,895 of 29,740
- Population · /systems
- #119 of 314
- Population · SC
- 19
- Total EPA violations on record
- 5%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
5 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 2,671
- County
- Charleston
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 15
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | MR | 4 | 2024 |
| Revised Total Coliform Rule | MON | 4 | 2024 |
| Chlorine | MR | 4 | 2024 |
| Coliform (TCR) | MR | 3 | 2003 |
| Consumer Confidence Rule | Other | 3 | 2007 |
| Coliform (TCR) | MCL | 1 | 2000 |
Violation Count vs. the National Corpus
Seabrook Island Town of (1010009) has 19 recorded EPA violations, 30% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 69% carry more. 5% of this system's own violations are health-based (1 of 19), and it ranks #6,895 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
19 Lower than most fewer violations than 69% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 15 of 116 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFBA | 8/21/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMBA | 8/21/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/21/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 8/21/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 8/21/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 8/21/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 8/21/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 8/21/2024 | 4.80 ppt | 3.00 ppt | Detected |
| PFMPA | 8/21/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 8/21/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDA | 8/21/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 8/21/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| NEtFOSAA | 8/21/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 8/21/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 8/21/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 8/21/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 8/21/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/21/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 8/21/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 8/21/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFNA | 8/21/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 8/21/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFUnA | 8/21/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/21/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/21/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| NMeFOSAA | 8/21/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTrDA | 8/21/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFOS | 8/21/2024 | 6.30 ppt | 4.00 ppt | Detected |
| PFHxS | 8/21/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 8/13/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 8/13/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/13/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/13/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 8/13/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 8/13/2024 | 3.70 ppt | 3.00 ppt | Detected |
| 6:2 FTS | 8/13/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDA | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 8/13/2024 | 6.10 ppt | 4.00 ppt | Detected |
| PFOA | 8/13/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 8/13/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpA | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 8/13/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 8/13/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
UCMR5 PFAS record for Seabrook Island Town of (1010009)
Open EPA SDWIS federal reports for PWS SC1010009 to cross-check UCMR5 detections and violation codes; state primacy agencies enforce the Safe Drinking Water Act locally.
Sources: EPA SDWIS
Nationwide peers
19 violations · 5,939 served: nearest cross-state SDWIS matches.
Cross-state systems with similarly light violation ledgers
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Seabrook Island Town of
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in South Carolina compares on the same EPA violation measures. South Carolina systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.