Tap Water Quality Report
Tap water quality in FREDERICK, Maryland
Tap water in FREDERICK, Maryland receives a grade of C (74/100) from TapWaterSafety.org. It's served by 2 public water systems, primarily CITY OF FREDERICK. The most significant water quality concerns are: 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 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 41.5 ppb, 692x above the EWG health guideline of 0.06 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 38.5 ppb, 385x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 50.4 ppb, 336x above the EWG health guideline of 0.15 ppb.
EPA compliance record
Official U.S. EPA records for CITY OF FREDERICK (system ID MD0100015) 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.
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.
CITY OF FREDERICK
- Haloacetic acids (HAA9) significantly above health guideline
- Haloacetic acids (HAA5) significantly above health guideline
- Total trihalomethanes (TTHMs) significantly above health guideline
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
Recommended filters for FREDERICK
Filters matched to the specific contaminants in FREDERICK's water supply.
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 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 CITY OF FREDERICK.