City of Rockville

Public water system · Maryland · serves 52,000 people · source: Potomac River · PWS ID MD0150003

High Risk

8 contaminants above health guidelines

At 443× the EWG health guideline, one glass of this tap water carries what 443 glasses should.

What’s in the water

× = times the EWG health guideline

Haloacetic acids (HAA9)Cancer-linked

×443

Total trihalomethanes (TTHMs)Cancer-linked

×277

Haloacetic acids (HAA5)Cancer-linked

×201

BromodichloromethaneCancer-linked

×46

DibromochloromethaneCancer-linked

×24

Also above the guideline (3 more): Nitrate and nitrite ×11 · Chloroform ×5.5 · Chromium (hexavalent) ×4.5

What actually fixes it

pick by what’s flagged above

Carbon / pitcher filter

Cuts chlorine taste & some byproducts. A good first step, misses nitrate, chromium-6 & PFAS.

Reverse Osmosis (RO)

Under-sink drinking-water system, removes the widest range: byproducts, nitrate, chromium-6 & PFAS.

Complete system

Softener and carbon for every tap, plus Reverse Osmosis (RO) at the kitchen for what whole-home can’t catch.

Free

Get the report for your own ZIP

Every flag for your address, what it means per glass, and which fix covers it, at myfreewaterreport.com/water-report.

Report prepared by SwiftPro Heating, Cooling & Plumbing · VA Class A Contractor License #2705192276 · Fully insured · 4230 Lafayette Center Dr, Suite N, Chantilly, VA 20151 · (571) 396-0299 · [email protected]
Water data via the EWG Tap Water Database (June 2026); this report is not affiliated with EWG. Levels are the latest reported system-wide averages and vary by home and season. Full detail at https://myfreewaterreport.com/water/rockville. SwiftPro builds and pays for this site. The reports are free whether or not you ever hire us.