Rockville, MD: High Radon Risk — 45/100 (2026)
8 ZIP codes · 4 water systems · Updated 2026-06-03
Systems across Rockville show elevated violation counts against MD benchmarks — the low safety grade reflects that ongoing compliance pattern.
How Rockville Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Rockville, 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 Rockville.
Rockville Water: The Quick Version
- Estimated remediation: $2,113 per household.
- CDC health risk index: 10.24.
Water Systems Serving Rockville
Rockville, MD draws its residential water from 3 separate providers among the 4 federally tracked systems. Each operates independently, with its own infrastructure, rate structure, and compliance record.
Overview
We track water quality and home safety data for 8 ZIP codes in Rockville, Maryland (population ~144,320), covering 4 community water systems serving approximately 1,901,494 people region-wide.
No EPA violations recorded across any ZIP codes in Rockville — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Rockville: D (45/100)
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
Rockville water systems draw from: Groundwater, Surface water.
Lead & Copper
- Lead data: not yet available for Rockville
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
- Zone 1 (High): 8 ZIP codes
- Zone 2 (Moderate): 0 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 |
|---|---|---|---|
| 20847 | D | WOODBINE VILLAGE MOBILE HOME PARK | 150 |
| 20848 | D | GRANITE MOBILE HOME PARK | 96 |
| 20849 | D | WOODBINE VILLAGE MOBILE HOME PARK | 150 |
| 20850 | D | WASHINGTON SUBURBAN SANITARY COMMISSION | 1,900,000 |
| 20851 | D | WASHINGTON SUBURBAN SANITARY COMMISSION | 1,900,000 |
| 20852 | D | WASHINGTON SUBURBAN SANITARY COMMISSION | 1,900,000 |
| 20853 | D | WASHINGTON SUBURBAN SANITARY COMMISSION | 1,900,000 |
| 20857 | D | WOODBINE VILLAGE MOBILE HOME PARK | 150 |
All ZIP Codes in Rockville
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 Rockville
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
Rockville: Remediation Cost in Perspective
Property equity in Rockville runs well ahead of estimated remediation costs — a cost-to-value ratio that sits in the low tier, meaning documented water and safety issues here are the kind homeowners can plan to address without treating the expense as a significant budget event relative to what their homes are worth.
Remediation costs in Rockville are relatively low compared to home values. The $1,388–$2,900 estimated range is a small fraction of median property value. Home values are 51% above the Maryland average.
Climate-Related Water Risk for Rockville
Flood activity in Rockville is neither negligible nor at the level of the highest-exposure areas in the NFIP dataset. The 70-claim record and 50% flood zone coverage suggest a community that has experienced recurrent events but has not faced the kind of sustained, severe exposure where water-supply contamination becomes a primary public health concern. It sits in a middle range where flood history merits inclusion in any complete local water quality picture.
Rockville has a moderate flood history with 70 FEMA claims averaging $5,042 per payout. 50% 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>$2,113</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 Rockville
- 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 Rockville, MD