CWS I-20 (SC) Water Quality

CWS I-20 is a small public water system in EPA region 4 that provides tap water for the 29073 zip codes. It has 1 facilities where the water supply was tested for 33 chemical contaminants that impact tap water quality and human health.

All the latest water samples for CWS I-20 had reported contaminant levels that were below unsafe concentration levels.

Contaminants

11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.005 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.005 µg/L
Reference Level: ?
Contaminant Details

1H,1H,2H,2H-perfluorodecane sulfonic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.005 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.005 µg/L
Reference Level: ?
Contaminant Details

1H,1H,2H,2H-perfluorohexane sulfonic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.003 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.003 µg/L
Reference Level: ?
Contaminant Details

1H,1H,2H,2H-perfluorooctane sulfonic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.005 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.005 µg/L
Reference Level: ?
Contaminant Details

4,8-dioxa-3H-perfluorononanoic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.003 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.003 µg/L
Reference Level: ?
Contaminant Details

9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.002 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.002 µg/L
Reference Level: ?
Contaminant Details

anatoxin-a (8)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.03 µg/L
Below Reporting Level
11/19/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.03 µg/L
Below Reporting Level
11/5/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.03 µg/L
Below Reporting Level
10/15/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.03 µg/L
Below Reporting Level
10/1/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.03 µg/L
Below Reporting Level
9/18/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.03 µg/L
Below Reporting Level
9/4/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.03 µg/L
Below Reporting Level
8/20/2018
7 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.03 µg/L
Below Reporting Level
8/6/2018
7 years ago
Minimum Reporting Level: 0.03 µg/L
Reference Level: ?
Contaminant Details

cylindrospermopsin (8)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.09 µg/L
Below Reporting Level
11/19/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.09 µg/L
Below Reporting Level
11/5/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.09 µg/L
Below Reporting Level
10/15/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.09 µg/L
Below Reporting Level
10/1/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.09 µg/L
Below Reporting Level
9/18/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.09 µg/L
Below Reporting Level
9/4/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.09 µg/L
Below Reporting Level
8/20/2018
7 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.09 µg/L
Below Reporting Level
8/6/2018
7 years ago
Minimum Reporting Level: 0.09 µg/L
Reference Level: 0.7 µg/L
Contaminant Details

hexafluoropropylene oxide dimer acid (GenX) (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
156%
0.0078 µg/L
⚠️ Exceeds Reporting Level of 0.005 µg/L by 0.0028 µg/L
3/19/2025
5 months ago
Minimum Reporting Level: 0.005 µg/L
Reference Level: ?
Contaminant Details

lithium (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<9 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 9 µg/L
Reference Level: ?
Contaminant Details

N-ethyl perfluorooctanesulfonamidoacetic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.005 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.005 µg/L
Reference Level: ?
Contaminant Details

N-methyl perfluorooctanesulfonamidoacetic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.006 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.006 µg/L
Reference Level: ?
Contaminant Details

nonafluoro-3,6-dioxaheptanoic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.02 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.02 µg/L
Reference Level: ?
Contaminant Details

perfluoro(2-ethoxyethane)sulfonic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.003 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.003 µg/L
Reference Level: ?
Contaminant Details

perfluoro-3-methoxypropanoic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.004 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.004 µg/L
Reference Level: ?
Contaminant Details

perfluoro-4-methoxybutanoic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.003 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.003 µg/L
Reference Level: ?
Contaminant Details

perfluorobutanesulfonic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.003 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.003 µg/L
Reference Level: ?
Contaminant Details

perfluorobutanoic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.005 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.005 µg/L
Reference Level: ?
Contaminant Details

perfluorodecanoic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.003 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.003 µg/L
Reference Level: ?
Contaminant Details

perfluorododecanoic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.003 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.003 µg/L
Reference Level: ?
Contaminant Details

perfluoroheptanesulfonic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.003 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.003 µg/L
Reference Level: ?
Contaminant Details

perfluoroheptanoic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.003 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.003 µg/L
Reference Level: ?
Contaminant Details

perfluorohexanesulfonic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.003 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.003 µg/L
Reference Level: ?
Contaminant Details

perfluorohexanoic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
106.7%
0.0032 µg/L
⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0002 µg/L
3/19/2025
5 months ago
Minimum Reporting Level: 0.003 µg/L
Reference Level: ?
Contaminant Details

perfluorononanoic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.004 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.004 µg/L
Reference Level: ?
Contaminant Details

perfluorooctanesulfonic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
137.5%
0.0055 µg/L
⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0015 µg/L
3/19/2025
5 months ago
Minimum Reporting Level: 0.004 µg/L
Reference Level: ?
Contaminant Details

perfluorooctanoic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.004 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.004 µg/L
Reference Level: ?
Contaminant Details

perfluoropentanesulfonic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.004 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.004 µg/L
Reference Level: ?
Contaminant Details

perfluoropentanoic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
120%
0.0036 µg/L
⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0006 µg/L
3/19/2025
5 months ago
Minimum Reporting Level: 0.003 µg/L
Reference Level: ?
Contaminant Details

perfluorotetradecanoic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.008 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.008 µg/L
Reference Level: ?
Contaminant Details

perfluorotridecanoic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.007 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.007 µg/L
Reference Level: ?
Contaminant Details

perfluoroundecanoic acid (1)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.002 µg/L
Below Reporting Level
3/19/2025
5 months ago
Minimum Reporting Level: 0.002 µg/L
Reference Level: ?
Contaminant Details

total microcystins (8)

MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.3 µg/L
Below Reporting Level
11/19/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.3 µg/L
Below Reporting Level
11/5/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.3 µg/L
Below Reporting Level
10/15/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.3 µg/L
Below Reporting Level
10/1/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.3 µg/L
Below Reporting Level
9/18/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.3 µg/L
Below Reporting Level
9/4/2018
6 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.3 µg/L
Below Reporting Level
8/20/2018
7 years ago
MM CX Oak Dr. & August Hwy.
CC 3210004 West Columbia ℹ️
0%
<0.3 µg/L
Below Reporting Level
8/6/2018
7 years ago
Minimum Reporting Level: 0.3 µg/L
Reference Level: ?
Contaminant Details

Sampling Facilities

CC 3210004 West Columbia
Surface Water (SW)

MM CX Oak Dr. & August Hwy.Entry Point to the Distribution System (EP)

FAQ

Is CWS I-20 tap water safe to drink?

When was CWS I-20 last tested for water contamination?

The latest water samples were taken on March 19th, 2025.