Household water treatment in Bethesda, Maryland.

Bethesda is served by WSSC Water, which says a small southern portion of Montgomery County receives a blend from its Patuxent and Potomac plants, whose 2025 tap analyses list average hardness of 70 and 154 mg/L respectively.

Two plants, one system

Across WSSC's distribution system, 2025 trihalomethanes reached a highest running average of 66 micrograms per liter against a limit of 80, and haloacetic acids 48 against 60. Because part of southern Montgomery County gets blended water, a Bethesda assessment looks at your own home rather than assuming one hardness for the whole area.

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 Bethesda 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

Bethesda systems are sized after a look at your water and your plumbing, not from a county average.