Gladstone Water Hardness & Quality Report (2026)

Gladstone, Oregon, in Clackamas County — a Clackamas County city adjacent to Oregon City and Milwaukie at the confluence of the Clackamas and Willamette Rivers in northwest Oregon — receives its water from the North Clackamas County Water Commission or a local utility, drawing from the Clackamas River through the northwest Oregon distribution.

The very soft 40.5 mg/L hardness and very low TDS of 75.5 mg/L reflect the Clackamas County Clackamas River supply's very soft character — the Columbia River Basalt and Cascade volcanic deposits are among the most insoluble geological formations in North America, contributing negligible dissolved minerals to the pristine Cascades snowmelt runoff (compare Oregon City OR: 39/72 in Clackamas County comparable; Milwaukie OR: 41/78 in Clackamas County comparable; Gladstone consistent very soft from the same Clackamas County Clackamas River Tertiary-Quaternary basalt supply). The Clackamas watershed — Tertiary Columbia River Basalt (insoluble — primary dilutant), Quaternary Cascade volcanic deposits (insoluble — secondary dilutant), and Holocene alluvium (insoluble — minimal TDS).

At 40.5 mg/L with TDS 76, Gladstone's water is very soft — virtually no scale buildup and excellent soap lathering. Older copper plumbing may see slight corrosion from the soft water; check annually. The PFAS level of 1.6 ppt is very low — excellent result. Gladstone has one of the cleanest water profiles in the country. Review the North Clackamas County Water Commission's annual water quality report.