Tap Water Quality Report
Tap water quality in MOUNT PLEASANT, South Carolina
Tap water in MOUNT PLEASANT, South Carolina receives a grade of F (55/100) from TapWaterSafety.org. It's served by MT PLEASANT WATER WORKS (1010002). 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 MOUNT PLEASANT's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving MOUNT PLEASANT.
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 12.3 ppb, 205x above the EWG health guideline of 0.06 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 9.6 ppb, 96x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 6.96 ppb, 46x above the EWG health guideline of 0.15 ppb.
Recommended filters for MOUNT PLEASANT
Filters matched to the specific contaminants in MOUNT PLEASANT's 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.
All contaminants detected in MOUNT PLEASANT'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 |
12.3 ppb | 0.06 | — | — | — | — | — | 205× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
9.6 ppb | 0.1 | 60.0 | 60 | — | — | — | 96× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
6.96 ppb | 0.15 | 80.0 | 100 | — | — | — | 46× over |
| Dibromoacetic acid Disinfection byproduct |
1.25 ppb | 0.03 | — | — | — | — | — | 42× over |
| Dichloroacetic acid Disinfection byproduct |
7.56 ppb | 0.2 | — | — | — | — | — | 38× over |
| Bromodichloromethane Disinfection byproduct |
2.06 ppb | 0.06 | — | — | — | — | — | 34× over |
| Dibromochloromethane Disinfection byproduct |
1.06 ppb | 0.1 | — | — | — | — | — | 11× over |
| Perfluorooctanoic acid (PFOA) PFAS |
1.01 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 11× over |
| Chloroform Disinfection byproduct |
3.84 ppb | 0.4 | — | — | — | — | — | 9.6× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
1.39 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 4.6× over |
| Trichloroacetic acid Disinfection byproduct |
0.377 ppb | 0.1 | — | — | — | — | — | 3.8× over |
| Chromium (hexavalent) Heavy metal |
0.0347 ppb | 0.02 | — | — | — | — | — | 1.7× over |
| Chlorate Disinfection byproduct |
125.1 ppb | 210.0 | — | — | — | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.142 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Nitrate and nitrite Inorganic |
0.0373 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| Nitrate Inorganic |
0.0122 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| Manganese Heavy metal |
2.64 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Vanadium Other |
0.34 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.404 ppb | 53.0 | — | — | — | — | — | Below guideline |
| 2,4-D* Pesticide/Herbicide |
0.04 ppb | 20.0 | 70.0 | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
1.14 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
1.01 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.9 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA)* PFAS |
0.4 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Picloram Other |
0.03 ppb | 166.0 | 500.0 | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0301 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.473 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Nitrite Inorganic |
0.0168 ppm | — | 1.0 | — | — | — | — | 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 MT PLEASANT WATER WORKS (1010002).