Upper Marlboro, MD Water Safety: 53/100 (2026)
5 ZIP codes · 3 water systems · Updated 2026-06-03
If you're researching Upper Marlboro, MD tap water quality, the baseline finding is below average — health-based violations are documented in several service areas, and verifying the specific system at your address is the right next step.
How Upper Marlboro Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Upper Marlboro, MD
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
Distribution of water safety grades across Upper Marlboro.
Upper Marlboro Water: The Quick Version
- Estimated remediation: $1,180 per household.
- CDC health risk index: 13.05 — above typical levels.
Water Systems Serving Upper Marlboro
Federal records list 3 water systems tied to Upper Marlboro, MD. Of those, 3 are the primary providers, meaning service conditions, rate structures, and compliance histories can differ depending on where a property sits.
Overview
We track water quality and home safety data for 5 ZIP codes in Upper Marlboro, Maryland (population ~104,989), covering 3 community water systems serving approximately 1,925,810 people region-wide.
No EPA violations recorded across any ZIP codes in Upper Marlboro — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Upper Marlboro: D (53/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Upper Marlboro water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Upper Marlboro
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 5 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 20772 | D | WASHINGTON SUBURBAN SANITARY COMMISSION | 1,900,000 |
| 20773 | D | MARYLAND MANOR MOBILE HOME PARK | 810 |
| 20774 | C | WASHINGTON SUBURBAN SANITARY COMMISSION | 1,900,000 |
| 20775 | D | CITY OF BOWIE | 25,000 |
| 20792 | D | MARYLAND MANOR MOBILE HOME PARK | 810 |
All ZIP Codes in Upper Marlboro
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
CDC Health Data for Upper Marlboro
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Upper Marlboro: Remediation Cost in Perspective
Across Upper Marlboro, the equity share taken up by estimated remediation is small — a favorable ratio for most property owners.
Remediation costs in Upper Marlboro are relatively low compared to home values. The $500–$2,000 estimated range is a small fraction of median property value. Home values are 4% above the Maryland average.
Climate-Related Water Risk for Upper Marlboro
131 FEMA flood insurance claims are on file for Upper Marlboro, and 40% of local ZIP codes fall within federally designated flood zones — enough to put flood exposure on the planning radar, though short of the concentrated-risk threshold where treatment-system vulnerability becomes a primary consideration.
Upper Marlboro has a moderate flood history with 131 FEMA claims averaging $5,404 per payout. 40% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$1,180</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
What You Can Do in Upper Marlboro
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
- Review your water system's CCR. Your utility publishes an annual Consumer Confidence Report with detailed test results. Request it or find it online.
Deep Dive Reports
Detailed analysis for Upper Marlboro, MD