Romulus Water Hardness & Quality Report (2026)

Romulus, Michigan, in Wayne County adjacent to Detroit Metropolitan Wayne County Airport (DTW) — a logistics, warehousing, and automotive supply chain hub in the Detroit metro's western corridor — receives its municipal water from the Great Lakes Water Authority (GLWA) system, which draws from the Detroit River and Lake Erie/Lake Huron intake facilities in the Detroit metropolitan water supply network. GLWA serves southeastern Michigan's major metropolitan communities through one of the largest regional water authorities in the United States.

The very hard 236 mg/L hardness and high TDS of 614.1 mg/L reflect the Detroit-area Great Lakes supply's strong carbonate character. The Detroit River connects Lake Huron through Lake St. Clair — collecting drainage from the Devonian and Silurian carbonate basin of Michigan and Ontario, including the Columbus Limestone, Traverse Group, Niagara Dolomite, and Bass Islands Dolomite. Southeastern Michigan's bedrock carbonate platform produces consistently hard water throughout the GLWA service area, with Romulus's supply in the hard-to-very-hard range consistent with the western Wayne County corridor.

At 236 mg/L, Romulus households face very hard water as a daily management challenge in this Detroit metro community. Scale accumulates rapidly in kettles and coffee machines within weeks, dishwashers require water softener treatment, and water heaters accumulate scale deposits reducing efficiency. Descaling appliances every four to six weeks is the practical schedule. A whole-house water softener is strongly recommended. Critically, the PFAS level of 13 ppt — among the very highest in the USA dataset — demands immediate attention: Romulus's proximity to Detroit Metropolitan Airport and the dense automotive and aerospace manufacturing infrastructure in western Wayne County creates substantial PFAS contamination in the regional supply. A certified reverse osmosis drinking water system is essential for this community.