Well Water in Atascosa County: What to Test and Why

Groundwater in Atascosa County contains iron, manganese, chloride, arsenic, and fluoride that well owners should monitor. Several of these contaminants exceed EPA health standards, which means they warrant attention and testing.

The coastal uplands aquifer system here sits above rock and soil layers that naturally contain iron and manganese minerals. As water moves slowly through these layers over time, it dissolves these metals and picks up chloride and other salts from deeper deposits. Human activity like oil and gas operations in the region can also contribute to elevated chloride levels in some areas.

Groundwater in this county is hard, driven mainly by elevated iron and calcium from the rock layers below. The iron content is particularly noticeable, while moderate sodium levels add to the overall mineral load. These characteristics show up across many wells in the county, though individual wells can vary quite a bit depending on their depth and location.

Wells in Atascosa County commonly have arsenic, chloride, fluoride, iron, and manganese at levels above EPA health standards. Arsenic can build up in your body over time and increase the risk of cancer and other serious illnesses. Fluoride at high levels can damage bones and teeth, especially in children. Chloride and manganese at elevated levels can also cause health problems with long-term exposure.

The hard water in county wells leaves stains on fixtures and clothes, and scale builds up inside pipes and appliances. Iron and manganese create rust-colored stains and can give water a metallic taste and smell. The hard water can shorten the lifespan of water heaters, dishwashers, and other appliances by causing mineral buildup inside them.

We recommend testing your well with a comprehensive panel since several contaminants exceed health standards in this area. Every well is different, and your water could 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 you can treat it properly. A comprehensive metals and minerals panel typically costs between two and four hundred dollars, and treatment options like reverse osmosis systems or specific filters can address multiple concerns.