Fairfax County, Virginia
63 ZIP codes · Avg score 51/100 · Grade D · Updated 2026-06-03
While Fairfax County's situation varies by ZIP, its 63 ZIP codes collectively fall below the state average — addressing specific concerns starts with checking the system that serves a given address.
How Fairfax County Compares
How Fairfax County Compares
Fairfax County scores 15 points below the Virginia state average (66/100) and 17 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Fairfax County, Virginia
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 9.9 (asthma 9.1%, diabetes 10.7%)
Estimated additional annual cost per homeowner: $2,324, driven primarily by sea_level
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $2,324
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 Fairfax County
Remediation costs are relatively manageable for most homeowners in Fairfax County, representing a small fraction of property value.
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 Fairfax County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Fairfax County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | FAIRFAX COUNTY WATER AUTHORITY | 1,121,613 | 0 |
| 2 | LOUDOUN WATER - CENTRAL SYSTEM | 334,808 | 0 |
| 3 | Herndon, Town of | 24,601 | 0 |
| 4 | VIENNA, TOWN OF | 30,000 | 0 |
| 5 | Fort Belvoir | 39,303 | 0 |
8 total water systems serve Fairfax County.
All ZIP Codes in Fairfax County
63 ZIP codes tracked in Fairfax County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 20172 | Herndon | 66 | C | 0 | — |
| 2 | 20192 | Herndon | 66 | C | 0 | — |
| 3 | 20193 | Herndon | 66 | C | 0 | — |
| 4 | 22060 | Fort Belvoir | 66 | C | 0 | $648K |
| 5 | 22095 | Herndon | 66 | C | 0 | — |
| 6 | 22183 | Vienna | 66 | C | 0 | — |
| 7 | 22185 | Vienna | 66 | C | 0 | — |
| 8 | 20170 | Herndon | 65 | C | 0 | $626K |
| 9 | 20171 | Herndon | 65 | C | 0 | $770K |
| 10 | 22180 | Vienna | 65 | C | 0 | $917K |
| 11 | 22181 | Vienna | 65 | C | 0 | $928K |
| 12 | 22182 | Vienna | 65 | C | 0 | $1087K |
| 13 | 22306 | Alexandria | 65 | C | 0 | $583K |
| 14 | 22308 | Alexandria | 65 | C | 0 | $871K |
| 15 | 22310 | Alexandria | 65 | C | 0 | $627K |
| 16 | 22311 | Alexandria | 65 | C | 0 | $692K |
| 17 | 22312 | Alexandria | 65 | C | 0 | $594K |
| 18 | 22315 | Alexandria | 65 | C | 0 | $609K |
| 19 | 22307 | Alexandria | 60 | C | 0 | $753K |
| 20 | 22309 | Alexandria | 60 | C | 0 | $540K |
| 21 | 22303 | Alexandria | 55 | C | 0 | $547K |
| 22 | 20151 | Chantilly | 53 | D | 0 | $647K |
| 23 | 20152 | Chantilly | 53 | D | 0 | $708K |
| 24 | 20163 | Sterling | 53 | D | 0 | — |
| 25 | 20190 | Reston | 53 | D | 0 | $569K |
| 26 | 20194 | Reston | 53 | D | 0 | $792K |
| 27 | 22027 | Dunn Loring | 53 | D | 0 | $1042K |
| 28 | 22033 | Fairfax | 53 | D | 0 | $622K |
| 29 | 22035 | Fairfax | 53 | D | 0 | — |
| 30 | 20164 | Sterling | 45 | D | 0 | $527K |
| 31 | 20165 | Sterling | 45 | D | 0 | $661K |
| 32 | 20191 | Reston | 45 | D | 0 | $617K |
| 33 | 22015 | Burke | 45 | D | 0 | $667K |
| 34 | 22031 | Fairfax | 45 | D | 0 | $710K |
| 35 | 22032 | Fairfax | 45 | D | 0 | $737K |
| 36 | 22039 | Fairfax Station | 45 | D | 0 | $974K |
| 37 | 22066 | Great Falls | 45 | D | 0 | $1240K |
| 38 | 22079 | Lorton | 45 | D | 0 | $601K |
| 39 | 22102 | Mc Lean | 45 | D | 0 | $1004K |
| 40 | 22124 | Oakton | 45 | D | 0 | $980K |
| 41 | 20122 | Centreville | 40 | D | 0 | — |
| 42 | 20153 | Chantilly | 40 | D | 0 | — |
| 43 | 20167 | Sterling | 40 | D | 0 | — |
| 44 | 20195 | Reston | 40 | D | 0 | — |
| 45 | 20196 | Reston | 40 | D | 0 | — |
| 46 | 20598 | Dhs | 40 | D | 0 | — |
| 47 | 22009 | Burke | 40 | D | 0 | — |
| 48 | 22030 | Fairfax | 40 | D | 0 | $701K |
| 49 | 22034 | Fairfax | 40 | D | 0 | — |
| 50 | 22037 | Fairfax | 40 | D | 0 | — |
| 51 | 22038 | Fairfax | 40 | D | 0 | — |
| 52 | 22067 | Greenway | 40 | D | 0 | — |
| 53 | 22081 | Merrifield | 40 | D | 0 | — |
| 54 | 22082 | Merrifield | 40 | D | 0 | — |
| 55 | 22096 | Reston | 40 | D | 0 | — |
| 56 | 22103 | West Mclean | 40 | D | 0 | — |
| 57 | 22116 | Merrifield | 40 | D | 0 | — |
| 58 | 22118 | Merrifield | 40 | D | 0 | — |
| 59 | 22119 | Merrifield | 40 | D | 0 | — |
| 60 | 22156 | Springfield | 40 | D | 0 | — |
| 61 | 22158 | Springfield | 40 | D | 0 | — |
| 62 | 22159 | Springfield | 40 | D | 0 | — |
| 63 | 22160 | Springfield | 40 | D | 0 | — |
Recommended Buyer Guides for Fairfax County
Where county records show a lead exceedance or pre-1978 housing concentration, lead-specific filters and test kits move toward the top of the list.
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Fairfax County, Virginia
Overview
Fairfax County in Virginia covers 63 ZIP codes with an average Home Safety Score of D (51/100).
No EPA violations recorded across any tracked ZIP codes in Fairfax County.
← Back to Virginia water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.
What You Can Do
Fairfax County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.