Well Water in Johnson County: What to Test and Why

Iron, arsenic, and chloride are present in Johnson County groundwater. Iron levels exceed EPA health standards and warrant attention.

Iron dissolves naturally from minerals in the sandy and clay layers of the Southeastern Coastal Plain aquifer system as water slowly moves through the rock. Arsenic and chloride also occur naturally in these sediments and can concentrate where water flow is slow or where clay layers trap water underground.

Groundwater in this county is moderately hard, driven primarily by elevated iron. The sandy soils and sediment layers here allow iron-bearing minerals to dissolve into water as it passes through the ground. Most wells across the county show this elevated iron character.

Wells in Johnson County contain iron at levels that exceed EPA health standards. Iron in drinking water poses health risks with long-term exposure, particularly for children and vulnerable populations. Your well water may also contain arsenic and chloride at levels worth monitoring, even if they are not universally elevated across the county.

The moderately hard water in county wells creates practical problems for your home and appliances. You will likely see reddish or brown stains on fixtures, laundry, and dishes from the iron. Scale buildup develops on pipes and water heaters, shortening their lifespan. You may notice a metallic taste in your water.

Every well in Johnson County is different, and your water could have much higher or lower iron than what is common here. Testing is the only way to know exactly what is in your well so you can treat it properly. We recommend a comprehensive metals and minerals panel to check for iron, arsenic, and other contaminants, which typically costs between two hundred and four hundred dollars. Treatment options like iron filters or water softeners can address these concerns once testing shows what you are dealing with.