Potomac, MD 20859
5 water systems • 1,068 residents
Poor water quality - filtration recommended
Score: 38/100
Graded on EPA violations, contaminants, severity, compliance, and enforcement history. See methodology.
Data updated June 2026 • Sources: EPA ECHO and EPA Envirofacts
22
Contaminants Detected
536
Violations on Record
42
Health-Based Violations
0
Recent Violations
Grade Breakdown
38 / 100 points
Recommended Water Filters
- ✓Point-of-Use Carbon Filter (NSF-certified for lead)
- ✓Reverse Osmosis or Ion Exchange Filter
- ✓Ultraviolet (UV) Purification
- ✓Activated Carbon Filter (disinfection byproducts)
- ✓Whole Home Carbon Filter System
Consult a water quality specialist for personalized recommendations.
Potomac vs MD & National Average
Detected Contaminants
22 contaminants detected across water systems serving this ZIP code
| Contaminant | Category |
|---|---|
| Nitrate | Agricultural |
| Total Haloacetic Acids (HAA5) | Disinfection Byproduct |
| TTHM | Disinfection Byproduct |
| Arsenic | Heavy Metal |
| Barium | Heavy Metal |
| Cadmium | Heavy Metal |
| Chromium | Heavy Metal |
| Lead and Copper Rule | Heavy Metal |
| Mercury | Heavy Metal |
| Selenium | Heavy Metal |
| Fluoride | Inorganic |
| Coliform (TCR) | Microorganism |
| E. COLI | Microorganism |
| Revised Total Coliform Rule | Microorganism |
| 2,4-D | Other |
| 2,4,5-TP | Other |
| BHC-GAMMA | Other |
| Consumer Confidence Rule | Other |
| Endrin | Other |
| Methoxychlor | Other |
| Toxaphene | Other |
| Gross Alpha, Excl. Radon and U | Radiological |
Water System Information
- Systems Serving This ZIP:
- APPLEGATE MOBILE HOME COMMUNITY, SILVER HILL MANUF HOME COMM. (SC4060019), THE OAKS OF THONOTOSASSA MHP, CRYSTAL ACRES MHP, WINDWARD KNOLL MHP
- Population Served:
- 1,068
- Systems With Violations:
- 5 of 5
- Major Violations:
- 244
- Enforcement Actions:
- 499
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.