Well Water in Keweenaw County: What to Test and Why

The water under Keweenaw County comes from old rock layers buried deep underground. These rocks are a mix of ancient basalt, sandstone, and other hard stone types. Water fills the tiny cracks and spaces between these rocks, moving slowly downward over many years.

Iron, arsenic, and chloride appear because groundwater sits for a long time inside iron-rich rock. As water touches the rock, it dissolves iron directly from the stone itself. Chloride comes partly from old saltwater that was trapped in these rocks millions of years ago. Arsenic occurs naturally in trace amounts mixed into the mineral-rich bedrock of this region.

The water here is extremely hard and carries very high levels of sodium and sulfate. The hardness comes from dissolved minerals in the old rock, and it will cause scale buildup on pipes and fixtures. High sodium and sulfate together give the water a bitter or salty taste. The high iron will stain sinks and laundry orange-brown over time.

Iron in Keweenaw County wells exceeds EPA health standards. Arsenic and chloride are also present in the area's water and warrant testing. The combination of these three contaminants plus very high mineral content makes this a moderate concern for your family's health.

Long-term exposure to elevated iron can affect your body's ability to absorb other nutrients. You will see orange and brown staining on sinks, toilets, and laundry. The extremely hard water will cause scale buildup on pipes and fixtures. Sulfate at high levels adds a bitter taste to drinking and cooking water.

Get a certified lab test from a state lab to understand what is actually in your well. A basic health screen runs $50–100. A comprehensive metals panel costs $200–400. Consider a whole-house water softener and iron filter to address the hardness and iron together.