LE
Legacy Environmental Laboratory, LLC
109 Carpenter Drive, Sterling, VA
Water testing labs in Loudoun County, VA
3 state-accredited water testing labs in Loudoun County, VA.
3 certified labsUpdated October 2026Source: state lab accreditation records
Source: Virginia DCLS list of drinking water laboratories with certification detail, list dated Aug 1, 2026. Find a Water Test is independent and not affiliated with Virginia's Division of Consolidated Laboratory Services (DCLS). Certification covers specific tests, so confirm the lab is certified for the ones you need: Verify a certification.
3 certified labs near Loudoun County, VA
LW
Loudoun Water Laboratory
44961 Loudoun Water Way, Ashburn, VA
Public water system lab. Many don't accept private well samples, so call first.
TL
Town of Leesburg Water Treatment Plant
43234 Edwards Ferry Road, Leesburg, VA
Public water system lab. Many don't accept private well samples, so call first.
Mail-in labs that ship to Loudoun County, VA
How mail-in testing worksNT
National Testing Laboratories (WaterCheck)
Ships nationwide
Single tests from $75; well and city packages $165 to $440
Certified in Virginia
TS
Tap Score by SimpleLab
Ships nationwide
About $189 to $1,125 (city and well kits, Oct 2026)
Testing service: sends your sample to a partner lab.
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Well water guides
Common questions
Where can I test well water near Loudoun County, VA?
The state-accredited labs above serve Loudoun County, VA. Many offer sample bottles you collect at home.
What should I test for near Loudoun County, VA?
Start with total coliform bacteria and nitrates, then ask your county health department about local concerns.