Household water treatment in Rockville, Maryland.

The City of Rockville treats Potomac River water at its own plant, in service since 1958, for about 70% of the city, and WSSC Water serves the rest; Rockville's 2025 report lists free chlorine at a running average of 1.0 ppm.

A city plant on the Potomac

Rockville's plant draws about 5 million gallons a day from the river and runs it through screening, coagulation, settling, sand and anthracite filtration and disinfection. Its 2025 report puts trihalomethanes at a highest running average of 74 ppb against a limit of 80, and a Rockville assessment begins by confirming whether your street is on the city system or WSSC.

The way we work does not change from house to house. We look up the public data on your water, tell you what your home actually needs, and put it in for one all-in price.

What we fit in Rockville homes

• A softener and carbon filter for the whole house, fitted on your main line, as the flagship bundle starting at $2,699 installed.
• Reverse osmosis under the sink for drinking water, and the part of the setup that deals with PFAS.

Done locally

In Rockville the first step is finding out which of the two suppliers serves your address.