29455
Charleston, SC
Charleston County · Charleston-North Charleston, SC metro area
CHARLESTON WATER SYSTEM (SC1010001)

Is tap water in Johns Island CCD (29455) safe to drink?

Higher concern
Last tested: October 2025
Source: Official EPA UCMR5 federal monitoring data. Last tested October 2025.
Cities:
Townships:
  • Johns Island CCD, SC
  • Kiawah Island-Seabrook Island CCD, SC
  • West Ashley CCD, SC
Community:
  • Johns Island, SC
Neighborhoods:
  • Essex Village
  • Castlewood
  • Orleans Estates
  • Orleans Woods
  • Plantation Estates
  • Saint Andrews Heights

The short answer for Johns Island CCD (29455)

Charleston tap water has 16 contaminants above EPA guidelines, including PFPeA at 2.2× the limit (tested November 2024). See the full compound-by-compound breakdown and filter recommendations.

The health risk for Charleston

PFAS ('forever chemicals') have been detected above EPA limits in this water system's most recent tests. These synthetic chemicals do not break down in the body and are linked to a range of health effects. A certified filter is strongly recommended.
  • PFBS, PFOA, PFOS, PFPeA above limit.
PFPeA concentration (µg/L) November 2024
0 µg/L 0.003 µg/L 0.01 µg/L
0.006 µg/L
Detected
µg/L
0.003 µg/L
EPA limit
guideline
117% above limit
Comparison
vs. guideline
EPA limit: 0.003 µg/L | Your water: 0.006 µg/L
Certified Filters for Charleston Tap Water

PFPeA (a PFAS 'forever chemical') was detected above EPA limits. These filters are independently certified to reduce common drinking-water contaminants.

Water filter recommendation for Charleston tap water: Epic Pure XP Water Filter Pitcher
Pitcher filter
Epic Pure XP Water Filter Pitcher
NSF-certified dual-layer filtration reduces 70+ contaminants including PFAS, lead, chlorine, microplastics, and bacteria.
NSF/ANSI 42, 53, 401 & P473Removes 99.99% PFASMade in USABPA-free
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Most elevated compounds
Compound Measurement EPA Limit Comparison
PFPeA
Tested: November 2024 · Town of Seabrook Island		 0.006 µg/L 0.003 µg/L 117% above limit
PFOS
Tested: November 2024 · Town of Seabrook Island		 0.007 µg/L 0.004 µg/L 88% above limit
PFPeA
Tested: October 2025 · Charleston CPW - Connection		 0.006 µg/L 0.003 µg/L 87% above limit
PFOS
Tested: October 2025 · Charleston CPW - Connection		 0.007 µg/L 0.004 µg/L 80% above limit
PFOS
Tested: September 2025 · Charleston Water System		 0.006 µg/L 0.004 µg/L 62% above limit
View all tested compounds

CC 1020002 St John's Water · Tested: October 2023

Compound Measurement EPA Limit Comparison
PFOS 0.006 µg/L 0.004 µg/L 57% above limit
PFPeA 0.005 µg/L 0.003 µg/L 57% above limit
PFBS 0.004 µg/L 0.003 µg/L 23% above limit
PFOA 0.004 µg/L 0.004 µg/L 7% above limit
PFHxA 0.005 µg/L 3 µg/L 0.2% of limit
lithium <9.000 µg/L 10 µg/L Below limit
PFHxS <0.003 µg/L 0.004 µg/L Below limit
HFPO-DA <0.005 µg/L 0.01 µg/L Below limit
PFNA <0.004 µg/L 0.01 µg/L Below limit
PFBA <0.005 µg/L 6 µg/L Below limit
11Cl-PF3OUdS <0.005 µg/L 0.005 µg/L Below limit
4:2 FTS <0.003 µg/L 0.003 µg/L Below limit
6:2 FTS <0.005 µg/L 0.005 µg/L Below limit
8:2 FTS <0.005 µg/L 0.005 µg/L Below limit
9Cl-PF3ONS <0.002 µg/L 0.002 µg/L Below limit
ADONA <0.003 µg/L 0.003 µg/L Below limit
PFDA <0.003 µg/L 0.003 µg/L Below limit
PFDoA <0.003 µg/L 0.003 µg/L Below limit
PFHpA <0.003 µg/L 0.003 µg/L Below limit
PFHpS <0.003 µg/L 0.003 µg/L Below limit
PFTrDA <0.007 µg/L 0.007 µg/L Below limit
PFUnA <0.002 µg/L 0.002 µg/L Below limit

Charleston CPW - Connection · Tested: October 2025

Compound Measurement EPA Limit Comparison
PFPeA 0.006 µg/L 0.003 µg/L 87% above limit
PFOS 0.007 µg/L 0.004 µg/L 80% above limit
PFBS 0.004 µg/L 0.003 µg/L 50% above limit
PFOA 0.005 µg/L 0.004 µg/L 35% above limit
PFHxA 0.005 µg/L 3 µg/L 0.2% of limit
lithium <9.000 µg/L 10 µg/L Below limit
PFHxS <0.003 µg/L 0.004 µg/L Below limit
HFPO-DA <0.005 µg/L 0.01 µg/L Below limit
PFNA <0.004 µg/L 0.01 µg/L Below limit
PFBA <0.005 µg/L 6 µg/L Below limit
11Cl-PF3OUdS <0.005 µg/L 0.005 µg/L Below limit
4:2 FTS <0.003 µg/L 0.003 µg/L Below limit
6:2 FTS <0.005 µg/L 0.005 µg/L Below limit
8:2 FTS <0.005 µg/L 0.005 µg/L Below limit
9Cl-PF3ONS <0.002 µg/L 0.002 µg/L Below limit
ADONA <0.003 µg/L 0.003 µg/L Below limit
PFDA <0.003 µg/L 0.003 µg/L Below limit
PFDoA <0.003 µg/L 0.003 µg/L Below limit
PFHpA <0.003 µg/L 0.003 µg/L Below limit
PFHpS <0.003 µg/L 0.003 µg/L Below limit
PFTrDA <0.007 µg/L 0.007 µg/L Below limit
PFUnA <0.002 µg/L 0.002 µg/L Below limit

Charleston Water System · Tested: September 2025

Compound Measurement EPA Limit Comparison
PFOS 0.006 µg/L 0.004 µg/L 62% above limit
PFPeA 0.004 µg/L 0.003 µg/L 47% above limit
PFBS 0.004 µg/L 0.003 µg/L 27% above limit
PFOA 0.004 µg/L 0.004 µg/L 3% above limit
PFHxA 0.004 µg/L 3 µg/L 0.1% of limit
lithium <9.000 µg/L 10 µg/L Below limit
PFHxS <0.003 µg/L 0.004 µg/L Below limit
HFPO-DA <0.005 µg/L 0.01 µg/L Below limit
PFNA <0.004 µg/L 0.01 µg/L Below limit
PFBA <0.005 µg/L 6 µg/L Below limit
11Cl-PF3OUdS <0.005 µg/L 0.005 µg/L Below limit
4:2 FTS <0.003 µg/L 0.003 µg/L Below limit
6:2 FTS <0.005 µg/L 0.005 µg/L Below limit
8:2 FTS <0.005 µg/L 0.005 µg/L Below limit
9Cl-PF3ONS <0.002 µg/L 0.002 µg/L Below limit
ADONA <0.003 µg/L 0.003 µg/L Below limit
PFDA <0.003 µg/L 0.003 µg/L Below limit
PFDoA <0.003 µg/L 0.003 µg/L Below limit
PFHpA <0.003 µg/L 0.003 µg/L Below limit
PFHpS <0.003 µg/L 0.003 µg/L Below limit
PFTrDA <0.007 µg/L 0.007 µg/L Below limit
PFUnA <0.002 µg/L 0.002 µg/L Below limit

Town of Seabrook Island · Tested: November 2024

Compound Measurement EPA Limit Comparison
PFPeA 0.006 µg/L 0.003 µg/L 117% above limit
PFOS 0.007 µg/L 0.004 µg/L 88% above limit
PFOA 0.005 µg/L 0.004 µg/L 25% above limit
PFBS 0.003 µg/L 0.003 µg/L 13% above limit
PFHxA 0.005 µg/L 3 µg/L 0.2% of limit
lithium <9.000 µg/L 10 µg/L Below limit
PFHxS <0.003 µg/L 0.004 µg/L Below limit
HFPO-DA <0.005 µg/L 0.01 µg/L Below limit
PFNA <0.004 µg/L 0.01 µg/L Below limit
PFBA <0.005 µg/L 6 µg/L Below limit
11Cl-PF3OUdS <0.005 µg/L 0.005 µg/L Below limit
4:2 FTS <0.003 µg/L 0.003 µg/L Below limit
6:2 FTS <0.005 µg/L 0.005 µg/L Below limit
8:2 FTS <0.005 µg/L 0.005 µg/L Below limit
9Cl-PF3ONS <0.002 µg/L 0.002 µg/L Below limit
ADONA <0.003 µg/L 0.003 µg/L Below limit
PFDA <0.003 µg/L 0.003 µg/L Below limit
PFDoA <0.003 µg/L 0.003 µg/L Below limit
PFHpA <0.003 µg/L 0.003 µg/L Below limit
PFHpS <0.003 µg/L 0.003 µg/L Below limit
PFTrDA <0.007 µg/L 0.007 µg/L Below limit
PFUnA <0.002 µg/L 0.002 µg/L Below limit

Water utilities serving ZIP 29455

Service area boundaries are approximate and based on state filings or modeled estimates. Contact your utility to confirm exact service at a specific address.

Modeled boundaries are shown with a dashed outline.

Frequently Asked Questions about ZIP 29455 Tap Water

What contaminants are above EPA limits in ZIP 29455?

ZIP 29455 has 16 contaminants above EPA health guidelines in the latest available data, including PFPeA at 2.2x the EPA guideline. The full table on this page lists every tested compound and its measured level.

Will boiling ZIP 29455 tap water remove PFPeA?

No. Boiling does not remove PFAS, and the compounds can actually become more concentrated as water evaporates. To reduce PFAS at home, use a filter independently certified to NSF/ANSI P473 (activated-carbon pitcher or under-sink) or NSF/ANSI 58 (reverse osmosis).

Do basic pitcher filters remove PFPeA?

Most basic pitcher filters are only certified to NSF/ANSI 42 or 53, which do not cover PFAS. Look for a filter independently certified to NSF/ANSI P473 (activated-carbon pitcher or under-sink) or NSF/ANSI 58 (reverse osmosis) on the spec sheet.

Who provides tap water in ZIP 29455?

Public records identify CHARLESTON WATER SYSTEM (SC1010001) as a primary water system associated with ZIP 29455. Service boundaries can vary by address, so confirm exact service with the utility.

When was ZIP 29455 tap water last tested?

The most recent test date used in this report is October 2025. EnviroClarity last refreshed this page on 2026-05-05.

Where can I find the official water quality report for ZIP 29455?

Every U.S. public water system is required to publish an annual Consumer Confidence Report (CCR). Contact CHARLESTON WATER SYSTEM (SC1010001) or visit their website for the latest official report covering ZIP 29455. The EPA also maintains a national CCR locator.

Primary source EPA UCMR5 (2023-2025)
Guideline source EPA PFAS drinking water standard (PFOS: 0,004 µg/L, effective 2024, compliance by 2031)
Last tested October 2025
Last page update 2026-05-05

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    Data reflects publicly reported utility records from EPA datasets and local utility disclosures. This information is educational and not medical advice.

    Protect your water in Charleston → see certified filters