Well Water in St. Croix County: What to Test and Why

Groundwater in St. Croix County contains iron, manganese, and nitrate. These contaminants exceed EPA health standards and require your attention.

The deep rock layer beneath the county naturally holds iron and manganese, which dissolve into groundwater as water moves slowly through the stone. Nitrate enters from agricultural and urban land use above ground, seeping down into the water supply. This combination of natural minerals and human activity creates the contamination pattern you see here.

Groundwater in this county is very hard, driven by elevated calcium and magnesium from the bedrock below. The deep rock formation releases these minerals as water passes through, and the very high hardness levels are widespread across wells throughout the county.

Iron, manganese, and nitrate are found at levels above EPA health standards in wells throughout St. Croix County. Nitrate from agricultural and septic sources can harm infants and cause serious illness. Iron and manganese at elevated levels can affect the nervous system, especially in children. Exposure to these contaminants over time creates real health risks for your household.

Hard water is very common in St. Croix County wells. You will see white scale buildup on fixtures, reduced soap and shampoo effectiveness, and staining on laundry and dishes. The extreme hardness here can shorten the lifespan of water heaters, dishwashers, and other appliances. You may also notice a metallic or off taste in the water.

Testing is the only way to know what is actually in your well. Your well may have higher or lower levels than what is common in the county. We recommend a comprehensive metals and minerals panel to check for all three contaminants and assess hardness. Testing costs between $200 and $400. Treatment options like iron removal systems, nitrate reduction, and water softeners can address these concerns once you know your specific levels.