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Counties → Virginia

Fairfax County, Virginia

SDWIS compliance plate

Sheet VA059 · Fairfax County 44 sys · 2,070 viol · #37/3254

VIOL-SEVERE · HEALTH-MID · RANK-TOP · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-MID · BOOK-FULL

  • VIOL-SEVERE 93.2% flagged
  • HEALTH-MID 20.1% health
  • RANK-TOP #37/3254
  • PHOTO-FINISH ±0.3 pp
  • PFAS-HIGH 100.0% detect
  • SRC-GW GW lead 84%
  • SYS-MID 44 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Montgomery County ( -0.3 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Fairfax County ranks #37 of 3,254 counties by people served, and #1 of 95 counties in Virginia. See methodology · corpus placement.

Fairfax County standing, mid-flagged corpus third

Flagged-system rate 93.2% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 20.1% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 100.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #37 of 3,254 · #1 of 95 in Virginia.

Flagged-rate neighbourhood around Fairfax County

Lowest/highest poles plus in-state counties nearest Fairfax County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Prince Edward · lowest Prince George · near Fairfax · this county Highland · highest 44.4% 92.9% 92.9% 92.9% 93.2% 93.7% 100%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

Water Systems

System Name Population Violations PFAS
Fairfax County Water Authority 1,121,613 1 Detected
Dulles Airport 76,500 34 Detected
Fort Belvoir 39,303 38 Detected
Vienna, Town Of 30,000 11 Detected
Herndon, Town Of 24,601 6 Detected
Fort Belvoir North Area 11,822 1 Detected
Mount Vernon 3,000 48 -
Fort Belvoir Woodlawn 2,200 0 -
Great Falls Park 2,000 59 -
Bull Run - Main System 1,001 6 -
Bull Run Special Events Center 1,000 12 -
Lake Fairfax-Campground 600 9 -
Riverbend Golf & Country Club 600 106 -
Fountainhead Reg Park - Marina 350 69 -
L`auberge Chez Francois 345 314 -
Tauxemont 250 96 -
Pohick Bay - Pool 200 16 -
Trattoria Villagio 175 54 -
Bull Run - Bathhouse #2 150 35 -
Bull Run - Comfort Station 2 150 31 -
Bull Run - Comfort Station 1 150 69 -
Clifton Cafe 132 0 -
Pleasant Valley Golf 122 102 -
Riverbend Golf - Back Nine 110 13 -
Peterson's Ice Cream Depot 105 4 -
Camp Fraser 100 53 -
Fountainhead Park Comfort Sta 100 16 -
Sandy Run Regional Park 100 31 -
Woodlands Stewardship Education Center 92 0 -
Clifton General Store 75 12 -
Trummer's on Main 75 8 -
Friends of Fairfax Station Inc 50 26 -
Mason Neck State Park 50 29 -
Pohick Bay - Comfort Station #3 50 29 -
Clifton Presby. Church Preschool 45 64 -
Bull Run - Shooting Center 44 44 -
St Francis Episcopal Church 40 19 -
Fairfax Yacht Club 31 217 -
Hemlock Overlook Regional Park 31 95 -
Eastern Ridge School, The 27 12 -
Clifton House 25 163 -
Clifton Town Meeting Hall 25 38 -
Riverbend Park Nature Center 25 21 -
Riverbend Park 25 59 -

Compare beyond Virginia

Mid-flagged peers for Fairfax County

Cross-state counties nearest Fairfax County on flagged-system share (93.2%) and cumulative violation count (2,070). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.