What's in Rockville, MD tap water?
Rockville's tap water comes from WSSC Water. While fully EPA-compliant, its disinfection-byproduct and hexavalent-chromium levels sit well above EWG's stricter health guidelines.
Zip codes covered: 20850, 20851, 20852, 20853 and surrounding Rockvilleareas. “× over” compares the detected level to EWG's health guideline, not the federal legal limit.
2 PFAS “forever chemicals” found in Rockville, MD's water
The EPA's most recent national testing round detected PFAS in Washington Suburban Sanitary Commission'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 Washington Suburban Sanitary Commission. Levels vary by sampling point and date. Learn more about PFAS.
How to get Rockville water off that list
Here is the good news: everything above comes out at your kitchen tap. WSSC Water treats the water for the whole Rockville system, but a reverse osmosis system finishes the job at your sink, catching what city treatment leaves behind. The Sanavia Hydra fits under a standard Rockville sink and is NSF-certified to cut haloacetic acids (haa5) and the rest by up to 99%.
Rockville water quality FAQ
Is Rockville, MD tap water safe to drink?
WSSC Water water meets all federal EPA legal limits. However, independent EWG testing finds 4 contaminants above its stricter health-based guidelines, including Haloacetic acids (HAA5) and Total trihalomethanes (TTHMs). Legal compliance and health-optimal water are not the same thing.
What contaminants are in Rockville water?
The most notable contaminants above EWG health guidelines are Haloacetic acids (HAA5), Total trihalomethanes (TTHMs), Chromium-6 (hexavalent), Arsenic. These are largely disinfection byproducts and trace metals common to the region's water sources.
Does a reverse osmosis system remove these contaminants?
Yes. A reverse osmosis system like the Sanavia Hydra uses a 0.0001-micron membrane plus multi-stage carbon filtration, NSF-certified to reduce every contaminant class detected in Rockville water, at your tap, regardless of what the utility does upstream.
The contaminants flagged in Rockville water
Plain-English guides to what WSSC Watertesting turns up above EWG's health guidelines — what each one is, and what actually removes it.