Well Water in Lapeer County: What to Test and Why

Groundwater in Lapeer County contains iron, arsenic, and manganese. Several of these contaminants exceed EPA health standards, making testing essential for well owners in this area.

These metals come naturally from the Marshall aquifer rock beneath the county. As groundwater moves slowly through the sandstone and related rock layers underground, iron and arsenic dissolve into the water. Chloride likely enters from road salt spread on highways during winter months.

Groundwater in this county is very hard, driven by elevated calcium and magnesium from the rock below. The water also carries high iron, which concentrates as it sits in contact with the sandstone. These mineral characteristics are common across wells throughout Lapeer County.

Wells in Lapeer County commonly contain arsenic, chloride, iron, manganese, and sulfate at levels above EPA health standards. Arsenic is a poison that builds up in your body over time and is linked to cancer and organ damage. Manganese can harm brain development in children and affect nerve function in adults. Chloride at elevated levels can damage your kidneys and increase blood pressure, especially for people watching their sodium intake. Iron and sulfate themselves do not pose direct health risks at the levels found here, but they add to the overall contamination picture in county wells.

Wells in this county produce water with extremely high mineral content. Iron causes orange-brown staining on sinks, toilets, and laundry that is difficult to remove. The very hard water leaves white crusty scale buildup on fixtures and can shorten the lifespan of water heaters and dishwashers. You may notice a metallic or rotten-egg taste or odor from the sulfate. Over time, mineral deposits build up inside pipes and reduce water pressure.

We recommend testing your well with a comprehensive metals and minerals panel, since multiple analytes exceed health standards. Every well is different, and your water 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 well so it can be properly treated. A comprehensive panel typically costs $200-400 and can identify exactly which contaminants need attention. Treatment options like reverse osmosis systems or specialized arsenic-removal filters paired with water softeners can address these concerns.