Well Water in Tuscola County: What to Test and Why

Groundwater in Tuscola County contains iron, arsenic, and chloride at levels that exceed EPA health standards. These contaminants are present at concentrations serious enough to warrant testing and treatment.

These metals dissolve naturally from the Marshall aquifer rock formation beneath the county. The sandstone and related rock layers that make up this aquifer contain iron, arsenic, and other minerals. As groundwater moves slowly through these rocks in low-oxygen conditions underground, these metals dissolve into the water. Chloride also accumulates from ancient salt deposits in the rock and from road salt that seeps down through the soil.

Groundwater in this county is very hard, driven primarily by elevated calcium and magnesium dissolved from the rock layers. Iron at high concentrations is also present in the water. The slow movement of groundwater through mineral-rich rock allows these elements to dissolve over time. These characteristics are common across wells in Tuscola County.

Wells in Tuscola County commonly contain arsenic, chloride, iron, and sulfate at levels exceeding EPA health standards. Arsenic is a serious health concern because drinking it over many years can increase the risk of cancer and damage your kidneys and nervous system. Chloride at elevated levels can harm people with heart disease or high blood pressure. Iron and sulfate themselves do not pose direct health risks at the levels found here, but they add to the overall mineral burden in the water.

The extremely hard water in this county causes noticeable quality-of-life problems. Iron stains sinks, toilets, and laundry a reddish-brown color that is hard to remove. Sulfate can give water a rotten-egg smell or bitter taste. The very high hardness means scale builds up on fixtures and inside pipes, water heaters, and dishwashers--shortening the lifespan of these appliances over time.

We recommend testing your well with a comprehensive metals and minerals panel, since 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. Treatment options like reverse osmosis systems or water softeners paired with iron filters can address these concerns.