Water Quality Report · Updated May 12, 2026
ROCK HILL CITY OF (SC4610002)
ROCK HILL CITY OF (SC4610002) delivers tap water graded D (55/100) by TapWaterSafety.org. The utility serves approximately 84,504 residents in ROCK HILL, South Carolina using surface water. The most significant water quality concerns are: PFAS contamination; Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline. For questions, the utility can be reached at 803-322-7494.
Is ROCK HILL tap water safe to drink?
ROCK HILL CITY OF (SC4610002) 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 84,504 residents in ROCK HILL, drawing from surface water.
Public testing data identifies 14 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA9), Total trihalomethanes (TTHMs), Haloacetic acids (HAA5), Bromodichloromethane, Trichloroacetic acid, Chloroform, Dichloroacetic acid, Dibromochloromethane, Dibromoacetic acid, Chromium (hexavalent), Perfluorooctanoic acid (PFOA), Nitrate, Tritium, Perfluorooctane sulfonate (PFOS). 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 ROCK HILL residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for ROCK HILL CITY OF (SC4610002).
PFAS contamination
Severe concernPerfluorooctanoic acid (PFOA), Perfluorooctane sulfonate (PFOS) 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 24.3 ppb, 405x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 35.4 ppb, 236x above the EWG health guideline of 0.15 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 16.0 ppb, 160x above the EWG health guideline of 0.1 ppb.
Contact ROCK HILL CITY OF (SC4610002)
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 ROCK HILL
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 |
24.3 ppb | 0.06 | — | — | — | — | — | 405× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
35.4 ppb | 0.15 | 80.0 | 100 | — | — | — | 236× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
16.0 ppb | 0.1 | 60.0 | 60 | — | — | — | 160× over |
| Bromodichloromethane Disinfection byproduct |
9.34 ppb | 0.06 | — | — | — | — | — | 156× over |
| Trichloroacetic acid Disinfection byproduct |
5.76 ppb | 0.1 | — | — | — | — | — | 58× over |
| Chloroform Disinfection byproduct |
21.9 ppb | 0.4 | — | — | — | — | — | 55× over |
| Dichloroacetic acid Disinfection byproduct |
9.61 ppb | 0.2 | — | — | — | — | — | 48× over |
| Dibromochloromethane Disinfection byproduct |
4.03 ppb | 0.1 | — | — | — | — | — | 40× over |
| Dibromoacetic acid Disinfection byproduct |
0.607 ppb | 0.03 | — | — | — | — | — | 20× over |
| Chromium (hexavalent) Heavy metal |
0.13 ppb | 0.02 | — | — | — | — | — | 6.5× over |
| Perfluorooctanoic acid (PFOA) PFAS |
0.48 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 5.3× over |
| Nitrate Inorganic |
0.33 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 2.4× over |
| Tritium Other |
702.67 pCi/L | 400.0 | — | — | — | — | — | 1.8× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
0.4 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 1.3× over |
| Chlorate Disinfection byproduct |
64.0 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Bromoform Disinfection byproduct |
0.102 ppb | 0.5 | — | — | — | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.0403 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Manganese Heavy metal |
1.95 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Vanadium Other |
0.404 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
4.26 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
3.78 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.0219 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0393 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.62 ppm | — | 4.0 | 1.5 | 1.5 | — | — | 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.
ROCK HILL CITY OF (SC4610002) service area
This water system serves 1 community in York County, South Carolina. Click any city for its dedicated tap water quality page.
Find the right filter for ROCK HILL water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.