Tap Water Quality Report
Tap water quality in FREDERICK, Maryland
Tap water in FREDERICK, Maryland receives a grade of D (64/100) from TapWaterSafety.org. It's served by 2 public water systems, primarily NEW DESIGN - FREDERICK COUNTY. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in FREDERICK's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utilities serving FREDERICK.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 28.8 ppb, 480x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 49.0 ppb, 326x above the EWG health guideline of 0.15 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 24.2 ppb, 242x above the EWG health guideline of 0.1 ppb.
Water systems serving FREDERICK
FREDERICK is served by 2 public water systems. Click any utility to see its complete grade card and treatment plant contact info.
NEW DESIGN - FREDERICK COUNTY
- Haloacetic acids (HAA9) significantly above health guideline
- Total trihalomethanes (TTHMs) significantly above health guideline
- Haloacetic acids (HAA5) significantly above health guideline
CITY OF FREDERICK
- Haloacetic acids (HAA9) significantly above health guideline
- Haloacetic acids (HAA5) significantly above health guideline
- Total trihalomethanes (TTHMs) significantly above health guideline
Recommended filters for FREDERICK
Filters matched to the specific contaminants in FREDERICK's water supply.
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 FREDERICK'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 |
41.5 ppb | 0.06 | — | — | — | — | — | 692× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
38.5 ppb | 0.1 | 60.0 | 60 | — | — | — | 385× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
50.4 ppb | 0.15 | 80.0 | 100 | — | — | — | 336× over |
| Bromochloroacetic acid Disinfection byproduct |
4.56 ppb | 0.02 | — | — | — | — | — | 228× over |
| Bromodichloromethane Disinfection byproduct |
6.14 ppb | 0.06 | — | — | — | — | — | 102× over |
| Chloroform Disinfection byproduct |
13.9 ppb | 0.4 | — | — | — | — | — | 35× over |
| Dibromochloromethane Disinfection byproduct |
3.08 ppb | 0.1 | — | — | — | — | — | 31× over |
| Nitrate and nitrite Inorganic |
1.61 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 12× over |
| Chromium (hexavalent) Heavy metal |
0.201 ppb | 0.02 | — | — | — | — | — | 10× over |
| Bromochloromethane Other |
0.579 ppb | 0.06 | — | — | — | — | — | 9.7× over |
| Nitrate Inorganic |
0.35 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 2.5× over |
| Bromoform Disinfection byproduct |
1.01 ppb | 0.5 | — | — | — | — | — | 2.0× over |
| Radium, combined (-226 and -228) Radiological |
0.1 pCi/L | 0.05 | 5.0 | — | — | — | — | 2.0× over |
| Chlorate Disinfection byproduct |
191.5 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Atrazine Pesticide/Herbicide |
0.086 ppb | 0.1 | 3.0 | 0.1 | 100 | 0.15 | — | Below guideline |
| Chloromethane Other |
1.86 ppb | 2.69 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
7.04 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Barium Heavy metal |
22.6 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Vanadium Other |
0.195 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
0.258 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.193 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.572 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Bromomethane Other |
0.0871 ppb | — | — | — | — | — | — | Below guideline |
| Chloroethane Other |
3.25 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 NEW DESIGN - FREDERICK COUNTY.