Water Quality Report · Updated May 12, 2026
GSW&SA (SC2620004)
GSW&SA (SC2620004) delivers tap water graded D (55/100) by TapWaterSafety.org. The utility serves approximately 252,840 residents in CONWAY, South Carolina using surface water. 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. For questions, the utility can be reached at 843-234-8989.
Is CONWAY tap water safe to drink?
GSW&SA (SC2620004) delivers tap water that earns a grade of D (55/100) from TapWaterSafety.org — a below-average rating, with multiple concerns including pfas contamination.
The utility serves 252,840 residents in CONWAY, drawing from surface water. Despite being legal under US EPA standards, this water would fail the European Union's Drinking Water Directive, primarily due to pfas contamination.
Public testing data identifies 14 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA9), Haloacetic acids (HAA5), Total trihalomethanes (TTHMs), Bromodichloromethane, Trichloroacetic acid, Dichloroacetic acid, Chloroform, Perfluorooctanoic acid (PFOA), Perfluorooctane sulfonate (PFOS), Dibromochloromethane, Nitrate and nitrite, Chromium (hexavalent), Nitrate, Atrazine. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for CONWAY residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for GSW&SA (SC2620004).
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.
Contact GSW&SA (SC2620004)
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for CONWAY
Filters matched to the specific contaminants in this water supply.
Reverse Osmosis or NSF P473 certified carbon
$80-$750Activated carbon and RO are the only technologies proven to remove PFAS at certified levels.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 55/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
GSW&SA (SC2620004) service area
This water system serves 1 community in Horry County, South Carolina. Click any city for its dedicated tap water quality page.
Find the right filter for CONWAY water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.