Loudoun County, Virginia
35 ZIP codes · Avg score 77/100 · Grade B
ZipCheckup grade for Loudoun County: B.
This ZIP has a few items worth a quick check.
In Loudoun County, where this site follows 35 ZIP codes, the composite grade sits in the upper band.
How Loudoun County Compares
How Loudoun County Compares
Loudoun County scores 2 points above the Virginia state average (75/100) and 4 points above the national average (73/100).
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData
ZIP Code Risk Map
Water Quality Map: Loudoun County, Virginia
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 9.7 (asthma 8.9%, diabetes 9.5%)
Modeled additional annual cost estimate per homeowner: $708, largest modeled factor: Sea Level
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINSA infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $708
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Loudoun County
Modeled remediation costs in Loudoun County can be compared with the median property value; actual costs vary by property.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Loudoun County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems mapped to Loudoun County ZIP codes
8 community water systems mapped to Loudoun County ZIP codes; EPA may list more systems serving the county.
- B
- B
- B
- C
- C
- C
Show all 8 water systems
- B
- B
12 water systems mapped to Loudoun County ZIP codes in our data; EPA may list more systems serving the county.
Systems with the most violations in Loudoun County
3 water systems with violations in EPA records.
- B
- B
All ZIP Codes in Loudoun County
35 ZIP codes tracked in Loudoun County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 20147 | Ashburn | 83 | B | 1 | $680K |
| 2 | 20148 | Ashburn | 83 | B | 1 | $844K |
| 3 | 20152 | Chantilly | 83 | B | 1 | $708K |
| 4 | 20165 | Sterling | 83 | B | 1 | $661K |
| 5 | 20166 | Sterling | 83 | B | 1 | $576K |
| 6 | 20176 | Leesburg | 83 | B | 1 | $702K |
| 7 | 20175 | Leesburg | 82 | B | 3 | $718K |
| 8 | 20141 | Round Hill | 67 | C | 0 | $677K |
| 9 | 20132 | Purcellville | 66 | C | 2 | $704K |
| 10 | 20158 | Hamilton | 66 | C | 2 | $771K |
| 11 | 20164 | Sterling | 66 | C | 1 | $527K |
| 12 | 20101 | Dulles | — | — | — | |
| 13 | 20102 | Dulles | — | — | — | |
| 14 | 20103 | Dulles | — | — | — | |
| 15 | 20104 | Dulles | — | — | — | |
| 16 | 20105 | Aldie | — | — | 5 | $807K |
| 17 | 20117 | Middleburg | — | — | 4 | $948K |
| 18 | 20118 | Middleburg | — | — | — | |
| 19 | 20129 | Paeonian Springs | — | — | $1206K | |
| 20 | 20131 | Philomont | — | — | — | |
| 21 | 20134 | Purcellville | — | — | — | |
| 22 | 20142 | Round Hill | — | — | — | |
| 23 | 20146 | Ashburn | — | — | — | |
| 24 | 20149 | Ashburn | — | — | — | |
| 25 | 20159 | Hamilton | — | — | — | |
| 26 | 20160 | Lincoln | — | — | — | |
| 27 | 20163 | Sterling | — | — | — | |
| 28 | 20167 | Sterling | — | — | — | |
| 29 | 20177 | Leesburg | — | — | — | |
| 30 | 20178 | Leesburg | — | — | — | |
| 31 | 20180 | Lovettsville | — | — | 0 | $629K |
| 32 | 20189 | Dulles | — | — | — | |
| 33 | 20197 | Waterford | — | — | 0 | $989K |
| 34 | 20598 | Dhs | — | — | — | |
| 35 | 22093 | Ashburn | — | — | — |
Recommended Buyer Guides for Loudoun County
Nothing on this list means a problem exists in your own home: the matches are drawn from county- and ZIP-level records, so a guide shows up because of an area signal, and only testing at your tap describes a specific household.
- Best Water Testing Kits — Baseline water quality check for your ZIP
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant peace of mind
Deep Dive Reports
Detailed analysis for Loudoun County, Virginia
Overview
Loudoun County in Virginia covers 35 tracked ZIP records with an average Home Safety Score of B (77/100) across 11 scored records.
12 of 15 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. The available record reports no health-based violations for this measured scope.
← Back to Virginia Home Safety Profile
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- PFAS screening: EPA UCMR 5
- Radon zones: EPA Map of Radon Zones
- Air quality: EPA AirData annual AQI
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.