Morristown Water Hardness & Quality Report (2026)

Morristown, New Jersey, in Morris County — the Morris County seat adjacent to Parsippany and Madison, a National Historic Landmark district and the site of Washington's Headquarters during the Revolutionary War, in the New Jersey Highlands corridor — receives its municipal water from New Jersey American Water (NJAW) or the Morristown Water Division, drawing from the Boonton Reservoir (Rockaway River, Morris County) through the NJAW Morris-Essex system.

The soft 81 mg/L hardness and TDS of 151.4 mg/L reflect the Boonton Reservoir's New Jersey Highlands character. The Rockaway River headwaters drain the New Jersey Highlands (Precambrian Reading Prong gneiss and granite — entirely insoluble crystalline silicate), the Cambrian Kittatinny Quartzite (insoluble), and the glacially scoured Morris County moraine and valley terrain. The result is the soft water characteristic of all New Jersey Highlands reservoir supplies.

At 81 mg/L, Morristown's water is soft — essentially no scale forms, soap lathers abundantly, and appliances maintain good efficiency. Annual descaling is sufficient. The PFAS level of 7.5 ppt warrants a certified drinking water filter — the Picatinny Arsenal (Morris County — a major US Army weapons manufacturing PFAS source in the Rockaway River watershed), Grumman and defense industry sites in Morris County, and the New Jersey Highlands PFAS corridor contribute to Morristown's elevated readings.