Water softeners and filtration in Roslyn, NY.

The Roslyn Water District serves about 17,900 people from seven Magothy wells, plus a well field in the Village of Roslyn where eight flowing artesian wells feed a single pump.

Total hardness in the district's 2025 report ranged from 12.7 to 143.0 mg/L, about 0.7 to 8.4 grains per gallon, so it changes a lot depending on which wells are supplying. Each well site adds sodium hydroxide for pH and calcium hypochlorite for disinfection.

What Roslyn homes are dealing with

What people notice changes from street to street here: a chlorine taste at the kitchen tap, scale where the water runs harder, or staining where there is iron. The assessment starts from what your utility publishes about the water at your address.

From there you get one recommendation for your home and one written price, before anything is ordered.

What we install in Roslyn

• Whole home softener and carbon filtration off your main line, the flagship bundle at $3,299 installed.
• Under sink reverse osmosis on its own faucet, for drinking and cooking water.

Local install

Every Roslyn job is handled locally, start to finish, by a Long Island company.