Romulus Water Hardness & Quality Report (2026)

The City of Romulus Water Department serves approximately 22,000 residents in Romulus, Wayne County, southeast Michigan. Water is supplied by the Great Lakes Water Authority (GLWA), which provides treated surface water to 127 municipalities including Romulus. The source is the Detroit River, a critical link in the Great Lakes system, processed at the GLWA Southwest Plant before distribution. The system is fully reliant on this regional surface supply network with no local groundwater or reservoirs used.

The Detroit River watershed spans the international boundary, fed by Lake Huron and St. Clair River inflows, with a drainage area exceeding 200,000 square kilometers. Underlying geology features Paleozoic carbonate platforms — Devonian-age Dundee and Rogers City limestones, alongside Antrim shale and Berea sandstone — that weather to release alkaline minerals. Michigan Basin stratigraphy shapes this chemistry, resulting in moderately mineralised water characteristic of urban Great Lakes intakes with elevated dissolved calcium and magnesium.

At moderately hard levels, scale accumulates in pipes, heaters, and fixtures, reducing efficiency in water heaters, dishwashers, and washing machines. Boilers and coffee makers require frequent deliming. Maintenance includes monthly vinegar flushes, annual descaling of heaters, and installing scale inhibitors. A water softener is recommended to extend appliance life and improve laundry performance. The 2024 Consumer Confidence Report confirms water meets federal standards; lead was detected at 0.00765 ppm — below action levels but above the EPA MCLG of 0 — so pre-1986 homes should flush taps for 30 seconds before use.