Oxford Water Hardness & Quality Report (2026)

Oxford, Connecticut, in the Naugatuck Valley region — a Naugatuck Valley town adjacent to Shelton and Seymour on the Housatonic watershed in south-central Connecticut — receives its water from a local water authority or private district, drawing from the Housatonic River tributary watershed through the south-central Connecticut distribution.

The ultra-soft 22.5 mg/L hardness and very low TDS of 36 mg/L make Oxford's water among the softest municipal supplies on the East Coast — the Precambrian Grenville Province gneiss and Carboniferous Hartford Basin basalt are both highly insoluble crystalline formations contributing negligible dissolved minerals to the pristine Connecticut Housatonic watershed (compare Shelton CT: 21/33 in Naugatuck Valley comparable; Seymour CT: 23/38 in Naugatuck Valley comparable; Oxford consistent ultra-soft from the same Naugatuck Valley Housatonic Precambrian insoluble supply). The Housatonic watershed — Precambrian Grenville Province gneiss (insoluble — primary dilutant), Carboniferous Hartford Basin basalt (insoluble — secondary dilutant), and Quaternary glacial outwash (slightly calcareous — minimal TDS).

At 22.5 mg/L with TDS 36, Oxford has exceptionally soft water — virtually no scale buildup. Soft water is gently corrosive — check for blue-green copper staining in older plumbing. The PFAS level of 5.2 ppt warrants a certified drinking water filter despite the excellent softness. Review the local water authority's annual water quality report.