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Tap water quality report

Johns Island (Sta.), SC

EPA monitoring detected 20 contaminants across the 2 water suppliers serving Johns Island (Sta.). A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

2
water suppliers
32,142
people served
20
contaminants found
South Carolina rankings Lead in South Carolina PFAS in South Carolina

What was found in Johns Island (Sta.)'s water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Copper
130 µg/L 10%
of the EPA limit 1300 µg/L
 2/2 SYR4
Total Haloacetic Acids (HAA5)
76.8 µg/L 128%
of the EPA limit, in the worst sample — 60 µg/L
 2/2 SYR4
Dichloroacetic Acid
71.07 µg/L
No EPA limit set
 2/2 SYR4
TTHM
38.63 µg/L 48%
of the EPA limit 80 µg/L
 2/2 SYR4
Dibromochloromethane
25.4 µg/L
No EPA limit set
 2/2 SYR4
Chloroform
22.51 µg/L
No EPA limit set
 2/2 SYR4
Trichloroacetic Acid
17.74 µg/L
No EPA limit set
 2/2 SYR4
Bromoform
14.24 µg/L
No EPA limit set
 2/2 SYR4
Dibromoacetic Acid
12.12 µg/L
No EPA limit set
 2/2 SYR4
Bromodichloromethane
11.46 µg/L
No EPA limit set
 2/2 SYR4
Monochloroacetic Acid
11.05 µg/L
No EPA limit set
 2/2 SYR4
Lead
8.4 µg/L 56%
of the EPA limit 15 µg/L
 2/2 SYR4
Monobromoacetic Acid
7.26 µg/L
No EPA limit set
 2/2 SYR4
Lead
0.5080 mg/L 3387%
above the EPA limit of 0.0150 mg/L
 2/2 LCR
Pfba
0.0087 µg/L
No EPA limit set
 1/2 UCMR-5
PFOS
0.0085 µg/L
No EPA limit set
 2/2 UCMR-5
Pfpea
0.0076 µg/L
No EPA limit set
 2/2 UCMR-5
PFOA
0.0054 µg/L
No EPA limit set
 2/2 UCMR-5
Pfhxa
0.0049 µg/L
No EPA limit set
 2/2 UCMR-5
PFBS
0.0045 µg/L
No EPA limit set
 2/2 UCMR-5
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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Johns Island (Sta.)

SupplierPopulation served
ST JOHN'S WATER (SC1020002) 22,592
KIAWAH ISLAND UTILITY (SC1010008) 9,550

Frequently asked questions about Johns Island (Sta.) tap water

Is Johns Island (Sta.) tap water safe to drink?

EPA testing detected 20 contaminants in the water serving Johns Island (Sta.). A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Johns Island (Sta.)?

2 public water suppliers report drinking-water monitoring for Johns Island (Sta.), South Carolina to the EPA. Each is listed above with its population served.

What contaminants are in Johns Island (Sta.)'s water?

The contaminants EPA monitoring detected in Johns Island (Sta.) include Copper, Total Haloacetic Acids (HAA5), Dichloroacetic Acid, TTHM, Dibromochloromethane. The full list, with the highest level found and the data source, is in the table above.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.