Herndon, VA: High Radon Potential Area - Home Safety 50/100
6 ZIP codes · 1 water system · Updated
ZipCheckup grade for Herndon: D.
Federal records show several conditions worth reviewing.
Treat the D-F grade for Herndon, VA as a summary of available data, not a measurement at your faucet.
How Herndon Compares
Data: EPA SDWIS
What You Should Know About Herndon Water
- Average of reported 90th-percentile lead results: 0.0012 mg/L.
- Estimated remediation: $500 per household.
- Health risk index (ZipCheckup composite of CDC data): 9.75.
Who Supplies Your Water in Herndon
Public water system records for Herndon, VA point to a single listed provider, drawn from 1 system in the federal data; its violation record appears below.
- D
Overview
We track home safety data for 6 ZIP codes in Herndon, Virginia (population ~94,168), covering 1 community water system serving approximately 1,121,613 people region-wide. The EPA snapshots used for this build directly map water systems to 2 of 6 ZIP codes.
The available EPA record reports 0 violations for 2 ZIP codes with a reported violation count.
Home Safety Score
Average Home Safety Score for Herndon: D (50/100)
Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| PFAS MCL Screen | UCMR 5 testing against the covered federal MCLs |
| Radon Risk | EPA radon zone classification |
| Annual AQI | EPA AirData county-year median with at least 90 observed days |
Water Sources
Herndon water systems draw from: Surface water.
Lead & Copper
- Average of reported 90th-percentile lead results: 0.0012 mg/L (EPA action level: 0.015 mg/L)
- 0 of 2 ZIP codes with known status exceed the EPA lead action level
Radon Risk
6 of 6 ZIP records with known zones are in EPA Radon Zone 1.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 20170 | D | Fairfax County Water Authority | 1,121,613 |
| 20171 | D | Fairfax County Water Authority | 1,121,613 |
All ZIP Codes in Herndon
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
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.
Health Outcomes in Herndon
Source: CDC PLACES (County-level estimates). County health indicators are shown for context only and are not linked to this area's water records.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Cost Context: What Remediation Means for Herndon Homeowners
Measured against the median home value, the estimated cost of fixing the issues flagged for Herndon lands in the lowest of the three tiers this page uses.
Estimated remediation costs in Herndon can be compared with local home values. The $300–$800 estimated range can be set against the median property value; actual costs vary by home. Home values are 146% above the Virginia average.
Lead Exposure Risk for Children in Herndon
Why children are most at risk: The CDC states that no safe blood lead level in children has been identified. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Available area-level lead records for Herndon do not determine the lead level at an individual tap. Testing is the only way to confirm your water's lead content.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Historical NFIP Claim Context in Herndon
Historical NFIP data for Herndon contains 48 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $3,592. Among ZIP codes with claim records, 0% have an A- or V-family dominant rated zone recorded in those historical claims. This is not a complete current FEMA property-map inventory.
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. The $500 remediation estimate shown here excludes flood insurance and is not derived from NFIP claim count.
Claim count does not establish current property risk. Check the exact address in FEMA's current map and obtain a property-specific insurance quote when relevant.
Source: historical FEMA National Flood Insurance Program (NFIP) claim records. No current FEMA property-map designation is asserted.
What You Can Do in Herndon
- Test your water at home. City-level data shows averages - your tap may differ. Check the certification, price and turnaround time of any water test kit or lab service.
- Install a certified water filter. Choose a pitcher or under-sink filter certified to reduce the specific contaminants of concern.
- 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. If you use a community water system, request its annual Consumer Confidence Report for system-level test results or find it online.
Deep Dive Reports
Detailed analysis for Herndon, VA