Well Water in Marion County: What to Test and Why

Iron, chloride, manganese, and nitrate are present in Marion County's groundwater and well owners should be aware of them. Several of these contaminants exceed EPA health standards, meaning they reach levels that warrant attention.

The Mississippi embayment aquifer system underlying this county naturally contains iron and manganese in its rock and sediment layers. As groundwater moves slowly through these materials, it dissolves these minerals. Chloride and nitrate come from a mix of natural saltwater deeper in the aquifer and agricultural or land-use sources near the surface.

Groundwater in this county is soft with moderate iron as the main mineral character. The rock layers here do not contain the calcium and magnesium that would make the water hard. Iron concentrations are notable across many wells in the county, though individual wells vary in how much is present.

Wells in Marion County commonly contain chloride, iron, manganese, and nitrate at levels that exceed EPA health standards. Chloride at elevated levels can be a concern for people on sodium-restricted diets and those with heart or kidney conditions. Iron and manganese can affect the nervous system and cause developmental issues in children when present at high concentrations. Nitrate is especially risky for infants under six months old, as it interferes with how blood carries oxygen through the body.

The mineral content in county wells creates some noticeable quality-of-life issues. Iron leaves orange or brown stains on sinks, toilets, and laundry that are difficult to remove. You may notice a metallic or bitter taste in the water. The good news is that your water is relatively soft, so you won't experience heavy scale buildup on pipes or shortened lifespans of water heaters and dishwashers.

We recommend a comprehensive water testing panel to find out exactly what is in your well, 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 needs treatment. A comprehensive metals and minerals panel typically costs between two hundred and four hundred dollars. Once you know your results, treatment options like reverse osmosis systems or whole-house filters can address your specific contaminants.