Water Quality Report · Updated May 12, 2026
CITY OF FREDERICK
CITY OF FREDERICK delivers tap water graded D (63/100) by TapWaterSafety.org. The utility serves approximately 54,000 residents in FREDERICK, Maryland using surface water. 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. For questions, the utility can be reached at 301-600-1754.
Is FREDERICK tap water safe to drink?
CITY OF FREDERICK delivers tap water that earns a grade of D (63/100) from TapWaterSafety.org — a below-average rating, with multiple concerns including haloacetic acids (haa9) significantly above health guideline.
The utility serves 54,000 residents in FREDERICK, drawing from surface water.
Public testing data identifies 10 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA9), Haloacetic acids (HAA5), Total trihalomethanes (TTHMs), Bromodichloromethane, Chloroform, Bromochloromethane, Dibromochloromethane, Nitrate and nitrite, Chromium (hexavalent), Nitrate. 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 FREDERICK residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for CITY OF 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.
Contact CITY OF FREDERICK
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 FREDERICK
Filters matched to the specific contaminants in this 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.
Score breakdown
This utility's overall score of 63/100 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 |
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 |
| Bromodichloromethane Disinfection byproduct |
4.08 ppb | 0.06 | — | — | — | — | — | 68× over |
| Chloroform Disinfection byproduct |
13.9 ppb | 0.4 | — | — | — | — | — | 35× over |
| Bromochloromethane Other |
0.579 ppb | 0.06 | — | — | — | — | — | 9.7× over |
| Dibromochloromethane Disinfection byproduct |
0.828 ppb | 0.1 | — | — | — | — | — | 8.3× over |
| Nitrate and nitrite Inorganic |
0.695 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 5.0× over |
| Chromium (hexavalent) Heavy metal |
0.0609 ppb | 0.02 | — | — | — | — | — | 3.0× over |
| Nitrate Inorganic |
0.35 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 2.5× over |
| Atrazine Pesticide/Herbicide |
0.086 ppb | 0.1 | 3.0 | 0.1 | 100 | 0.15 | — | Below guideline |
| Chloromethane Other |
0.361 ppb | 2.69 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
14.6 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
22.4 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Manganese Heavy metal |
1.52 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Vanadium Other |
0.195 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
0.258 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.103 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.572 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.
CITY OF FREDERICK service area
This water system serves 1 community in Frederick County, Maryland. Click any city for its dedicated tap water quality page.
Find the right filter for FREDERICK water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.