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Counties → Virginia

Loudoun County, Virginia

SDWIS compliance plate

Sheet VA107 · Loudoun County 102 sys · 4,980 viol · #162/3254

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

  • VIOL-SEVERE 77.5% flagged
  • HEALTH-LOW 8.1% health
  • RANK-TOP #162/3254
  • PHOTO-FINISH ±0.3 pp
  • PFAS-HIGH 80.0% detect
  • SRC-GW GW lead 95%
  • SYS-MID 102 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Chesterfield County (+ 0.3 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Loudoun County ranks #162 of 3,254 counties by people served, and #2 of 95 counties in Virginia. See methodology · corpus placement.

Loudoun County standing, lower-flagged corpus third

Flagged-system rate 77.5% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 8.1% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 80.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #162 of 3,254 · #2 of 95 in Virginia.

Flagged-rate neighbourhood around Loudoun County

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

0% 20% 40% 60% 80% 100% Prince Edward · lowest Westmoreland · near Chesterfield · near Highland · highest 44.4% 76.9% 77.1% 77.5% 77.8% 78.6% 100%

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

Water Systems

System Name Population Violations PFAS
Loudoun Water - Central System 334,808 43 Detected
Leesburg, Town Of 65,028 0 Clean
Purcellville, Town Of 8,929 41 Detected
Round Hill, Town Of 5,019 52 Detected
Lovettsville, Town Of 2,964 101 -
Hamilton, Town Of 2,240 37 Detected
Selma Estates 1,540 0 -
Elysian Heights 1,061 0 -
VA Revolution Sportsplex 1,001 25 -
Middleburg, Town Of 803 188 -
Claude Mr Pk-Visit Ctr (Prev Roy Geiger) 800 10 -
Franklin Park 800 8 -
Cornerstone Christian Academy 653 24 -
Loudoun Golf & Country Club 490 1 -
Stoneleigh 438 0 -
Beacon Hill-Lcsa 333 14 -
Foxcroft School 301 142 -
Orion Project (Hitt) 300 3 -
Scott Jenkins Memorial Park 300 0 -
Reserve at Rokeby Farm 284 0 -
Lucketts Elementary School 269 4 -
North Spring Behavioral Healthcare 225 76 -
Main Street Truck Stop 206 80 -
Flying Ace Farm 200 9 -
Waterford Elementary School 196 11 -
Banneker Elementary School 193 16 -
Adesa Washington DC 178 170 -
Camp Highroad 150 72 -
Middleburg Community Center 150 5 -
Bluemont Community Center 146 23 -
Lincoln Elementary School 137 9 -
Whitehall Associates Lc 125 74 -
Old 690 Brewery 115 10 -
Aldie Elementary School 106 1 -
Saint Francis Desales Catholic Church 103 16 -
Harpers Ferry Adventure Center 100 3 -
Creighton Farms 95 0 -
Hillsboro, Town Of 88 1,416 -
Loudoun County Firing Range 88 0 -
Eagletree Farm 86 12 -
Hiway Mhc LLC 80 23 -
Sterling Ruritan 75 8 -
Aldie Water Company 70 558 -
Creeks Edge Winery 64 24 -
One Stop Trailer Park 60 440 -
Tart Lumber Company, Inc. 60 26 -
The Ag District Center 58 4 -
Cerritos Pupuseria 58 74 -
Stone Tower - Tower View 58 21 -
North Oatlands Animal Hospital 55 4 -

Compare beyond Virginia

Lower-flagged peers for Loudoun County

Cross-state counties nearest Loudoun County on flagged-system share (77.5%) and cumulative violation count (4,980). 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.