Prince William County, Virginia
19 ZIP codes · Avg score 71/100 · Grade B · Updated 2026-06-03
Compared to state averages, Prince William County scores well — its 19 ZIP codes sit above the baseline for tap water quality.
How Prince William County Compares
How Prince William County Compares
Prince William County scores 5 points above the Virginia state average (66/100) and 3 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Prince William County, Virginia
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.2 (asthma 9.8%, diabetes 11.4%)
Estimated additional annual cost per homeowner: $2,547, driven primarily by sea_level
Infrastructure: 0.256% avg pipe failure probability
38.6% of homes built before 1978 (lead paint era)
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $2,547
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
156,623 housing units in Prince William County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Prince William County
Remediation costs are relatively manageable for most homeowners in Prince William 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 Prince William 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 Prince William County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Pwcsa - West | 136,409 | 8 |
| 2 | City of Manassas, | 42,696 | 8 |
| 3 | Baileys Mobile Home Park | 84 | 8 |
| 4 | Rolling Brook Mobile Home Park | 54 | 8 |
| 5 | PWCSA - EAST | 168,747 | 2 |
12 total water systems serve Prince William County.
All ZIP Codes in Prince William County
19 ZIP codes tracked in Prince William County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 20136 | Bristow | 83 | B | 0 | $586K |
| 2 | 22134 | Quantico | 83 | B | 0 | $238K |
| 3 | 22135 | Quantico | 83 | B | 0 | — |
| 4 | 22194 | Woodbridge | 83 | B | 0 | — |
| 5 | 22195 | Woodbridge | 83 | B | 0 | — |
| 6 | 22192 | Woodbridge | 78 | B | 0 | $466K |
| 7 | 22193 | Woodbridge | 78 | B | 0 | $427K |
| 8 | 20109 | Manassas | 77 | B | 2 | $412K |
| 9 | 20110 | Manassas | 77 | B | 2 | $445K |
| 10 | 20112 | Manassas | 77 | B | 2 | $616K |
| 11 | 22191 | Woodbridge | 73 | B | 0 | $433K |
| 12 | 20111 | Manassas | 72 | B | 2 | $449K |
| 13 | 20181 | Nokesville | 63 | C | 0 | $671K |
| 14 | 22172 | Triangle | 63 | C | 0 | $510K |
| 15 | 22199 | Lorton | 63 | C | 0 | — |
| 16 | 22025 | Dumfries | 55 | C | 0 | $498K |
| 17 | 22026 | Dumfries | 55 | C | 0 | $436K |
| 18 | 22125 | Occoquan | 55 | C | 0 | $485K |
| 19 | 20182 | Nokesville | 53 | D | 0 | — |
Recommended Buyer Guides for Prince William County
Below: editorial picks, no sponsored placements.
- 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 Prince William County, Virginia
Overview
Prince William County in Virginia covers 19 ZIP codes with an average Home Safety Score of B (71/100).
4 of 19 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← 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.