Chantilly, VA: High Radon Risk — 49/100 (2026)
3 ZIP codes · 2 water systems · Updated 2026-06-03
Across water systems in Chantilly, EPA data shows a below-average compliance pattern for VA — health-based violations are on file in several areas, and checking the specific system serving your address is a practical first step for concerned residents.
How Chantilly Compares
Data: EPA SDWIS Last verified: 2026-06-03
Chantilly Water: The Quick Version
- Homes built before 1986: 25% — older plumbing may contain lead solder.
- Estimated remediation: $2,567 per household.
- CDC health risk index: 9.75.
Water Systems Serving Chantilly
Throughout Chantilly, VA, water comes from one of 2 primary utilities out of 2 total systems — independent providers with different rate structures, infrastructure, and compliance records that vary across the service territory.
Overview
We track water quality and home safety data for 3 ZIP codes in Chantilly, Virginia (population ~58,955), covering 2 community water systems serving approximately 1,456,421 people region-wide.
No EPA violations recorded across any ZIP codes in Chantilly — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Chantilly: D (49/100)
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
Chantilly water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Chantilly
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
- Zone 1 (High): 3 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 |
|---|---|---|---|
| 20151 | D | FAIRFAX COUNTY WATER AUTHORITY | 1,121,613 |
| 20152 | D | LOUDOUN WATER - CENTRAL SYSTEM | 334,808 |
| 20153 | D | FAIRFAX COUNTY WATER AUTHORITY | 1,121,613 |
All ZIP Codes in Chantilly
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 Chantilly
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
How Old Is Chantilly's Housing Stock?
Housing age data helps assess potential lead pipe and infrastructure risks. Newer housing stock generally means lower plumbing-related contamination risk.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
The median home in Chantilly was built in 1994, after the federal ban on lead solder in plumbing. Most of the housing stock postdates that cutoff, placing typical plumbing risk on the lower end — though any home built before 1986 still warrants individual testing.
Most homes in Chantilly were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Chantilly: Remediation Cost in Perspective
In Chantilly, the equity impact of remediation is proportionally small — not the kind of financial commitment that rises to the level of a genuine planning constraint, but a minor share of what most properties here are worth.
Remediation costs in Chantilly are relatively low compared to home values. The $1,700–$3,500 estimated range is a small fraction of median property value. Home values are 126% above the Virginia average.
Protecting Children from Lead in Chantilly
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Confirming what flows from a specific faucet still requires a one-home draw, even where Chantilly averages stay clean and the pre-rule housing share holds at 25%.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Chantilly
11 FEMA flood insurance claims are on file for Chantilly, and 67% 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.
Chantilly has a moderate flood history with 11 FEMA claims averaging $888 per payout. 67% 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>$2,567</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 Chantilly
- 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 Chantilly, VA