Frederick, MD 21704
14 water systems • 85,001 residents
Excellent water quality with minimal contaminants
Score: 93/100
Graded on EPA violations, contaminants, severity, compliance, and enforcement history. See methodology.
Data updated June 2026 • Sources: EPA ECHO and EPA Envirofacts
12
Contaminants Detected
105
Violations on Record
36
Health-Based Violations
0
Recent Violations
Grade Breakdown
93 / 100 points
Recommended Water Filters
- ✓Reverse Osmosis or Ion Exchange Filter
- ✓Ultraviolet (UV) Purification
- ✓Activated Carbon Filter (disinfection byproducts)
Consult a water quality specialist for personalized recommendations.
Frederick vs MD & National Average
Detected Contaminants
12 contaminants detected across water systems serving this ZIP code
| Contaminant | Category |
|---|---|
| Nitrate | Agricultural |
| Chlorite | Disinfection Byproduct |
| Total Haloacetic Acids (HAA5) | Disinfection Byproduct |
| TTHM | Disinfection Byproduct |
| Coliform (TCR) | Microorganism |
| Revised Total Coliform Rule | Microorganism |
| Chlordane | Other |
| Chlorine dioxide | Other |
| Groundwater Rule | Other |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | Other |
| Toxaphene | Other |
| Gross Alpha, Excl. Radon and U | Radiological |
Water System Information
- Systems Serving This ZIP:
- CLOVERHILL 3 - CONSECUTIVE TO MD0100015, LIBERTYTOWN APARTMENTS, COPPERFIELD, CAMBRIDGE FARMS, COUNTRY MEADOWS OF FREDERICK +5 more
- Population Served:
- 85,001
- Systems With Violations:
- 7 of 14
- Major Violations:
- 42
- Enforcement Actions:
- 105
Frequently Asked Questions
What does the grade mean?
Our A–F grade ranks this ZIP code's water quality against every other analyzed ZIP in the country, based on EPA data. A = among the best, F = among the most troubled.
Is my tap water safe to drink?
Water systems regulated by the EPA must comply with Safe Drinking Water Act standards. However, if you're concerned about water quality, consider a water filter appropriate for your contaminants.
How often is the data updated?
We update our data quarterly with the latest EPA ECHO and Envirofacts data. Historical violations are tracked to identify patterns.
What filters do you recommend?
Filter recommendations are based on detected contaminants in your area. See our Filter Guide for detailed information about different filter types.