What was found in ZIP 29455
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Fluoride | 575 µg/L 14% of the EPA limit 4000 µg/L Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2019 | 1/4 | SYR4 |
| Nitrate | 520 µg/L 5.2% of the EPA limit 10000 µg/L Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2019 | 1/4 | SYR4 |
| Copper | 138.5 µg/L 11% of the EPA limit 1300 µg/L Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2018
Highest in the ZIP: 149 µg/L — SEABROOK ISLAND TOWN OF (1010009) · 5,939 people · 2019 | 4/4 | SYR4 |
| Nitrate-Nitrite | 100 µg/L 1% of the EPA limit 10000 µg/L Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2017 | 1/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 35.5 µg/L 59% of the EPA limit 60 µg/L Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2019
Highest in the ZIP: 40.8025 µg/L — ST JOHN'S WATER (SC1020002) · 22,592 people · 2019 | 4/4 | SYR4 |
| TTHM | 26.075 µg/L 33% of the EPA limit 80 µg/L Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2019
Highest in the ZIP: 31.0635 µg/L — KIAWAH ISLAND UTILITY (SC1010008) · 9,550 people · 2019 | 4/4 | SYR4 |
| Dichloroacetic Acid | 26.519 µg/L No EPA limit set Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2019
Highest in the ZIP: 30.019 µg/L — ST JOHN'S WATER (SC1020002) · 22,592 people · 2019 | 4/4 | SYR4 |
| Lead | 9.87 µg/L 66% of the EPA limit 15 µg/L Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2018
Highest in the ZIP: 17.69 µg/L — SEABROOK ISLAND TOWN OF (1010009) · 5,939 people · 2019 | 4/4 | SYR4 |
| Bromoform | 14.0875 µg/L No EPA limit set Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2019
Highest in the ZIP: 14.162 µg/L — SEABROOK ISLAND TOWN OF (1010009) · 5,939 people · 2019 | 4/4 | SYR4 |
| Chloroform | 12.703 µg/L No EPA limit set Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2019 | 4/4 | SYR4 |
| Monochloroacetic Acid | 11.54 µg/L No EPA limit set Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2019 | 3/4 | SYR4 |
| Dibromoacetic Acid | 8.2815 µg/L No EPA limit set Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2019
Highest in the ZIP: 10.676 µg/L — SEABROOK ISLAND TOWN OF (1010009) · 5,939 people · 2019 | 4/4 | SYR4 |
| Trichloroacetic Acid | 4.608 µg/L No EPA limit set Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2019
Highest in the ZIP: 10.202 µg/L — SEABROOK ISLAND TOWN OF (1010009) · 5,939 people · 2019 | 4/4 | SYR4 |
| Bromodichloromethane | 7.971 µg/L No EPA limit set Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2019 | 4/4 | SYR4 |
| Dibromochloromethane | 6.62 µg/L No EPA limit set Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2019
Highest in the ZIP: 7.75 µg/L — KIAWAH ISLAND UTILITY (SC1010008) · 9,550 people · 2019 | 4/4 | SYR4 |
| Monobromoacetic Acid | 3.708 µg/L No EPA limit set Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2019
Highest in the ZIP: 3.997 µg/L — ST JOHN'S WATER (SC1020002) · 22,592 people · 2019 | 4/4 | SYR4 |
| Pfba | 0.0087 µg/L No EPA limit set Highest in the ZIP: KIAWAH ISLAND UTILITY (SC1010008) · 9,550 people · 2023 | 1/4 | UCMR-5 |
| PFOS | 0.0065 µg/L No EPA limit set Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2025
Highest in the ZIP: 0.0085 µg/L — ST JOHN'S WATER (SC1020002) · 22,592 people · 2025 | 4/4 | UCMR-5 |
| Pfpea | 0.0047 µg/L No EPA limit set Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2025
Highest in the ZIP: 0.0078 µg/L — SEABROOK ISLAND TOWN OF (1010009) · 5,939 people · 2024 | 4/4 | UCMR-5 |
| PFOA | 0.0044 µg/L No EPA limit set Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2025
Highest in the ZIP: 0.0054 µg/L — ST JOHN'S WATER (SC1020002) · 22,592 people · 2025 | 4/4 | UCMR-5 |
| Pfhxa | 0.0043 µg/L No EPA limit set Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2025
Highest in the ZIP: 0.0049 µg/L — KIAWAH ISLAND UTILITY (SC1010008) · 9,550 people · 2023 | 4/4 | UCMR-5 |
| PFBS | 0.0038 µg/L No EPA limit set Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2025
Highest in the ZIP: 0.0045 µg/L — ST JOHN'S WATER (SC1020002) · 22,592 people · 2025 | 4/4 | UCMR-5 |
| Lead | 0.0035 mg/L 23% of the EPA limit 0.0150 mg/L Main supplier: CHARLESTON WATER SYSTEM (SC1010001) · 327,422 people · 2024
Highest in the ZIP: 0.0040 mg/L — SEABROOK ISLAND TOWN OF (1010009) · 5,939 people · 2025 | 4/4 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
Water suppliers serving ZIP 29455
| Supplier | State | Population served |
|---|---|---|
| CHARLESTON WATER SYSTEM (SC1010001) | SC | 327,422 |
| ST JOHN'S WATER (SC1020002) | SC | 22,592 |
| KIAWAH ISLAND UTILITY (SC1010008) | SC | 9,550 |
| SEABROOK ISLAND TOWN OF (1010009) | SC | 5,939 |
Frequently asked questions about ZIP 29455 tap water
Is the tap water in ZIP 29455 safe to drink?
EPA testing detected 23 contaminants across the water suppliers serving ZIP 29455. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 29455?
4 public water suppliers report EPA drinking-water monitoring for ZIP 29455. Each is listed above with its population served.
What contaminants are in ZIP 29455's water?
EPA monitoring detected Fluoride, Nitrate, Copper, Nitrate-Nitrite, Total Haloacetic Acids (HAA5), and others across this ZIP's suppliers. The full list with levels and sources is above.