What's in Loudoun County, VA tap water?
Loudoun County sits about 31 miles from our Arlington base and is served primarily by Loudoun Water - Central System, which provides water to roughly 334,808 people. It draws from the Potomac River watershed. Most of the DC metro area drinks treated Potomac River water. Because that surface water is heavily chlorinated to stay safe across a long distribution system, the contaminants that most often exceed EWG's stricter health guidelines here are chlorination byproducts, alongside unregulated contaminants like PFAS and hexavalent chromium.
Larger areas have more than one water system. Enter your exact zip code below for your utility's own EPA record and EWG report.
1 PFAS “forever chemical” found in Loudoun County, VA's water
The EPA's most recent national testing round detected PFAS in Loudoun Water - Central System's supply. The EPA's 2024 legal limit for PFOA and PFOS is just 4 ppt, and its own health goal is zero, no level is considered safe.
Reverse osmosis is independently rated the most effective way to remove PFAS at the tap.
See the fixSource: EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR5), highest detected result per compound for Loudoun Water - Central System. Levels vary by sampling point and date. Learn more about PFAS.
Your tap water is legal. That doesn't make it clean.
Enter any U.S. zip code to see your water utility and the contaminants in its supply. For DC-metro utilities we show levels measured against the stricter EWG health guideline, not just the legal limit.
DC-metro levels from the EWG Tap Water Database & utility Consumer Confidence Reports; nationwide results from EPA SDWIS records. Utilities shown are in legal EPA compliance. “× over” compares the detected level to EWG's stricter health-based guideline, not the federal legal limit.
Getting cleaner water in Loudoun County
Your city treats the water for everyone; a reverse osmosis system handles the last few feet, at your own sink, where it matters. The Sanavia Hydra is NSF-certified to cut the potomac river watershed contaminants above by up to 99%. Loudoun County is about 31 miles from our Arlington base, so it is inside our free in-home installation area, and every system ships nationwide with local installer help wherever you are.
Loudoun County water quality FAQ
Is Loudoun County, VA tap water safe to drink?
Public water in Loudoun County meets federal EPA legal limits. But "legal" is not the same as "clean": across the Potomac River watershed, independent testing routinely finds contaminants like Total trihalomethanes (TTHMs) and Haloacetic acids (HAA5) above EWG's stricter health guidelines. Enter your zip code above to see your exact utility's record.
What contaminants are common in Loudoun County water?
For the Potomac River watershed, the contaminants that most often exceed health guidelines are Total trihalomethanes (TTHMs), Haloacetic acids (HAA5), Hexavalent chromium (chromium-6), PFAS (forever chemicals), Lead (from older service lines). Your specific levels depend on your utility, which you can look up by zip code above.
Does Sanavia install reverse osmosis systems in Loudoun County?
Yes. Loudoun County is roughly 31 miles from our Arlington base and inside our service area. A Sanavia Hydra reverse osmosis system installs under your sink and is NSF-certified to reduce every contaminant class above, and we offer a free in-home water test.
Where does Loudoun County tap water come from?
Loudoun County's primary public water system is Loudoun Water - Central System, which serves roughly 334,808 people. It sits in the Potomac River watershed, so its water shares that region's contaminant profile. Larger areas may have more than one utility, so enter your exact zip code above for your own system's EPA record.
Is well water in Loudoun County tested for these contaminants?
No. Private wells are not covered by municipal testing, so the responsibility falls on the homeowner. If your Loudoun County home is on a well, nitrate and naturally occurring contaminants are worth testing for specifically, and a reverse osmosis system reduces them at the tap. We offer a free in-home water test either way.
The contaminants behind the Potomac River watershed
Each of these is a plain-English guide to a contaminant class common in Loudoun County and the surrounding Potomac River watershed — what it is, the health context, and what actually removes it.
Detailed city water reports
For the largest DC-metro utilities we publish the full measured contaminant table.