Tap Water Quality Report
Tap water quality in CONWAY, South Carolina
Tap water in CONWAY, South Carolina receives a grade of D (65/100) from TapWaterSafety.org. It's served by GSW&SA (SC2620004). The most significant water quality concerns are: PFAS contamination; Haloacetic acids (HAA9) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in CONWAY's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving CONWAY.
PFAS contamination
Severe concernPerfluorooctane sulfonate (PFOS), Perfluorooctanoic acid (PFOA) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 36.2 ppb, 604x above the EWG health guideline of 0.06 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 25.2 ppb, 252x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 30.8 ppb, 205x above the EWG health guideline of 0.15 ppb.
EPA compliance record
Official U.S. EPA records for GSW&SA (SC2620004) (system ID SC2620004) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for CONWAY
Filters matched to the specific contaminants in CONWAY's water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in CONWAY's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
36.2 ppb | 0.06 | — | — | — | — | — | 604× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
25.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 252× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
30.8 ppb | 0.15 | 80.0 | 100 | — | — | — | 205× over |
| Bromodichloromethane Disinfection byproduct |
5.62 ppb | 0.06 | — | — | — | — | — | 94× over |
| Trichloroacetic acid Disinfection byproduct |
8.71 ppb | 0.1 | — | — | — | — | — | 87× over |
| Dichloroacetic acid Disinfection byproduct |
16.3 ppb | 0.2 | — | — | — | — | — | 81× over |
| Chloroform Disinfection byproduct |
24.9 ppb | 0.4 | — | — | — | — | — | 62× over |
| Perfluorooctanoic acid (PFOA) PFAS |
3.36 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 37× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
3.48 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 12× over |
| Dibromochloromethane Disinfection byproduct |
0.282 ppb | 0.1 | — | — | — | — | — | 2.8× over |
| Nitrate and nitrite Inorganic |
0.345 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 2.5× over |
| Chromium (hexavalent) Heavy metal |
0.0461 ppb | 0.02 | — | — | — | — | — | 2.3× over |
| Nitrate Inorganic |
0.314 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 2.2× over |
| Atrazine Pesticide/Herbicide |
0.182 ppb | 0.1 | 3.0 | 0.1 | 100 | 0.15 | — | Fails EU |
| Chlorate Disinfection byproduct |
167.5 ppb | 210.0 | — | — | — | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.178 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Dibromoacetic acid Disinfection byproduct |
0.0117 ppb | 0.03 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
4.36 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Vanadium Other |
0.305 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.271 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
0.15 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
3.72 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
2.19 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Monochlorobenzene (chlorobenzene) Volatile organic compound |
0.133 ppb | 70.0 | 100.0 | 1 | 10 | 0.15 | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
1.63 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
1.25 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
1.38 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0503 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Dicamba Other |
0.13 ppb | — | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
1.21 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
5.99 ppb | — | — | — | — | — | — | Below guideline |
| Metolachlor Pesticide/Herbicide |
0.1 ppb | — | — | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from GSW&SA (SC2620004).