Well Water in Nueces County: What to Test and Why

Groundwater in Nueces County contains arsenic, chloride, sulfate, fluoride, iron, manganese, and uranium. Several of these contaminants exceed EPA health standards, making them a real concern for well owners in this area.

The coastal location and geology of this region naturally concentrate these contaminants in the groundwater. The sandy and clay layers here contain arsenic and uranium from the rock itself. Saltwater from the nearby gulf pushes inland and mixes with freshwater, bringing chloride and sulfate deeper into the aquifer. Oil and gas activities in the county also contribute to elevated chloride and sulfate levels in some wells.

Groundwater in this county is very hard and very high in sulfate, driven by calcium, magnesium, and sulfate minerals from the rock and salty groundwater mixing. These minerals accumulate because rainwater dissolves them as it moves down through the sandy layers and encounters the deeper salty zones. Elevated iron and manganese are also common. Most wells in Nueces County show some combination of these characteristics.

Wells in Nueces County commonly exceed EPA health standards for arsenic, uranium, fluoride, and manganese. Arsenic and uranium are radioactive elements that can increase cancer risk with long-term exposure. Fluoride at elevated levels can damage bone and teeth, especially in children. Manganese can harm the nervous system and affect learning and behavior in children.

Wells in this county have moderate iron and very high sulfate levels, creating quality-of-life concerns. Iron leaves orange or brown stains on fixtures, laundry, and plumbing. The high sulfate gives water a salty taste and can cause laxative effects. Hard water leaves white scale buildup inside pipes and appliances, shortening the lifespan of water heaters and dishwashers.

We recommend a comprehensive metals and minerals panel to test your well, since multiple analytes exceed health standards in the county. Every well is different, and your water may have higher or lower levels than what is common here. Testing is the only way to know what is actually in your well so it can be properly treated. A comprehensive panel typically costs between two hundred and four hundred dollars. Reverse osmosis systems or ion exchange can address multiple contaminants.