No open EPA violations as of 2026-10-15.
EPA record checked 2026-10-06
From EPA's record for SC1010001. PurityMap is independent of Charleston Water System.
Every community water system publishes one each year.
Read the report ↗As listed in EPA's records. Your water bill names your supplier.
A ZIP code is a postal area, not a water service area. Your water bill names your supplier.
Are you this utility? Correct this listing →
32 results are on record. These 5 come first: results above a listed reference, then those closest to a legal limit.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanesulfonic acid (PFOS) | 6.5 ng/L | 4.0 ng/L federal MCL (2024) | Above EPA's 2024 limit (one sample) | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluorooctanoic acid (PFOA) | 4.7 ng/L | 4.0 ng/L federal MCL (2024) | Above EPA's 2024 limit (one sample) | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Lead (90th percentile) | 3.5 µg/L | 15 µg/L federal action level | Below the listed reference | 2022–2024 monitoring period | Lead & Copper Rule 90th-percentile: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluorobutanesulfonic acid (PFBS) | 4.3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluorohexanoic acid (PFHxA) | 4.6 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Water hardness | 3.2 gpg | Aesthetic, no federal health limit | Within a secondary/aesthetic reference | 2026 | Charleston Water System 2026 Consumer Confidence Report (CCR) |
| Perfluoropentanoic acid (PFPeA) | 5 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-24 to 2025-12-09 | UCMR5 Analytical Results: CHARLESTON WATER SYSTEM (SC1010001) (SC1010001) |
1health-based violation in the last 10 years · none open as of 2026-10-15
From EPA SDWIS. Counted once per contaminant per year in the Track record subject score. A violation record is a compliance fact, not a health verdict.
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure
Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Tested your own tap? Read your results →
★ Best choice: Aquasana Claryum 2-Stage Under-Sink Filter (AQ-5200), certified for PFOA, PFOS and lead.
| Pick | Product | Certification | Price | Link |
|---|---|---|---|---|
| ★ Best choice | Aquasana Claryum 2-Stage Under-Sink Filter (AQ-5200) | Certified for PFOA and PFOS (NSF/ANSI 53, WQA) | $$ | Check price on Amazon |
| Also good | Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M) | Certified for PFOA and PFOS (NSF/ANSI 53, WQA) | $$ | Check price at Aquasana |
| Also good | Aquasana Clean Water Machine Countertop Filter (AQ-CWM2) | Certified for PFOA and PFOS (NSF/ANSI 53, WQA) | $$ | Check price at Aquasana |
★ Best choice: HealthShield™, certified for PFOA and PFOS.
| Pick | Product | Certification | Price | Link |
|---|---|---|---|---|
| ★ Best choice | HealthShield™ | Certified for PFOA and PFOS (NSF/ANSI 53, WQA) | $$$$ | Check price at Aquasana |
| $ Budget pick | iSpring WGB32B-PFKS PFAS & Heavy Metals Whole House FilterUse code REFISPRING at checkout: 10% off your first iSpring order. | Brand lab-tested for PFAS, not independently certified for PFOA, PFOS, Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA) and Perfluoropentanoic acid (PFPeA) | $$$ | Check price at iSpring |
Also: lead picks →
PurityMap earns a commission from these links. "Best choice" and "Budget pick" go to certified products first; commission never decides them. As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
Lead service lines
Charleston Water System reported 6,504 lead and 2 galvanized service lines to replace in EPA’s inventory (2026Q2). Many utilities replace these lines for free or share the cost. Ask Charleston Water System whether your home’s line is on its list before you pay anyone.
Local help
Call to be connected with a local plumbing provider about lead service lines, repiping or fixture replacement.
One email when a new sampling round is published or a result moves across its reference.
Follow this water →Its phone number on EPA record is 843-863-4038 and its mailing address is PO BOX B, CHARLESTON, SC 29402-0017. These details come from the system's EPA record.
PurityMap has no verified website for Charleston Water System. Its mailing address on EPA record is PO BOX B, CHARLESTON, SC 29402-0017. Your water bill lists the ways to pay. PurityMap does not take payments.
EPA's records list Charleston Water System as serving Charleston, South Carolina. Your water bill names your supplier.
PurityMap's record for Charleston Water System holds results for 29 PFAS substances. 5 were detected, and none is above a federal legal limit. Each result links to its source in the city report.
No open EPA violations as of 2026-10-15: that is what EPA's record shows for Charleston Water System. The record comes from EPA's SDWIS compliance database.
Charleston Water System is on EPA record as drawing from surface water.
Start with the hot-or-cold tap check. Where Charleston Water System reported something related, it's shown below.
Lead at Charleston Water System: 3.5 µg/L (90th percentile, 2022–2024 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.