Well Water in Gonzales County: What to Test and Why

Groundwater in Gonzales County contains manganese, iron, chloride, arsenic, lead, fluoride, and nitrate at levels that exceed EPA health standards. Several of these contaminants reach concerning amounts, with arsenic, chloride, and nitrate being the most important for well owners to monitor.

These contaminants come from a mix of sources. The rock layers here naturally contain iron and manganese, which dissolve into groundwater as it moves through the soil. Saltwater and chloride seep up from deeper layers in the coastal geology. Nitrate enters from fertilizers and septic systems used on the land above. Arsenic and lead also occur naturally in the rock but can be concentrated by the way water moves through these particular soil and rock layers.

Groundwater in this county is moderately hard, driven by moderate iron and elevated sodium in the water. The rock and soil here release these minerals as water passes through, and the coastal setting allows sodium-rich water to move upward into shallower wells. Most wells across the county show these characteristics, though individual wells vary depending on their depth and location.

Wells in Gonzales County can contain arsenic, chloride, fluoride, iron, lead, manganese, nitrate, and sulfate at levels above EPA health standards. Arsenic and lead are serious concerns because they can build up in your body over time and cause organ damage and developmental problems in children. Nitrate is especially dangerous for infants and can affect how blood carries oxygen. Manganese can harm your nervous system with long-term exposure.

The mineral content in county wells creates practical problems in your home. Iron and manganese cause orange, brown, or black staining on fixtures, laundry, and dishes. The water tastes metallic and can smell bad. The moderately hard water in this county causes scale buildup in pipes and appliances, which can shorten the lifespan of your water heater and dishwasher.

We recommend testing your well water to find out exactly what you are dealing with. Every well is different, and your well may have higher or lower levels than what is common in the county. Testing is the only way to know what actually needs treatment. Since several analytes exceed health standards here, a comprehensive panel testing metals, minerals, and bacteria is recommended and typically costs $200 to $400. Treatment options like iron filters, reverse osmosis systems, or activated carbon can address these concerns once you know your specific levels.