Well Water in Allegan County: What to Test and Why

Groundwater in Allegan County contains iron, manganese, and arsenic. These contaminants exceed EPA health standards and require attention.

These metals dissolve naturally from the rock layers beneath the county. The Marshall aquifer contains minerals that release iron and manganese into water when oxygen is low deep underground. Arsenic also occurs naturally in this rock and leaches into groundwater over time.

Groundwater in this county is very hard, driven by elevated calcium and magnesium from the limestone and mineral-rich rock below. The same conditions that release iron and manganese also concentrate these hardness minerals as water moves slowly through the aquifer. Very hard water is common across wells in this county.

Wells in Allegan County commonly contain arsenic, iron, and manganese at levels above EPA health standards. Arsenic is particularly concerning because it has no taste, smell, or color, so you cannot detect it without testing. Long-term exposure to arsenic in drinking water can increase the risk of cancer and harm organs like the kidneys and heart. Iron and manganese can also cause health problems over time, especially for infants and young children whose brains are still developing.

Wells in this county have very hard water, which means mineral buildup will form inside your pipes, water heater, and appliances like dishwashers and washing machines. This extreme hardness can shorten the lifespan of these appliances. You may also notice rust-colored or brown staining on sinks, toilets, and laundry. The high iron can give water a metallic taste and create unpleasant odors.

We recommend testing your well water with a comprehensive metals and minerals panel, since every well is different and your well may have higher or lower levels than what is common in the county. Testing is the only way to know what is actually in your water so it can be properly treated. A comprehensive panel typically costs $200-400. Treatment options like oxidation filters or whole-house water softeners can address these concerns.