Well Water in Cobb County: What to Test and Why

Groundwater in Cobb County contains arsenic, fluoride, iron, lead, manganese, radon, and sulfate at levels that exceed EPA health standards. Several of these contaminants reach moderate to high concentrations, making them a real concern for well owners in this area.

These contaminants come from the local rock itself. The crystalline bedrock--granite, schist, and related hard rocks--naturally releases iron, manganese, and arsenic as groundwater slowly dissolves them over time. Sulfate also comes from minerals in this same bedrock. Radon and fluoride are released through the same natural weathering process.

Groundwater in this county is moderately hard and high in sulfate, driven by dissolved minerals from the crystalline rock below. The combination of moderate iron, moderately hard conditions, and elevated sulfate reflects what happens when water moves through granite and similar crystalline bedrock for years. These characteristics are common across many wells in Cobb County because the underlying rock chemistry affects water throughout the region.

Wells in Cobb County have been found to contain arsenic, fluoride, lead, manganese, radon, and sulfate at levels above EPA health standards. Arsenic and lead can damage your kidneys and nervous system with long-term exposure. Radon is a radioactive gas that increases lung cancer risk. Fluoride at high levels can affect bone health. Manganese can harm your brain and nervous system, especially in children.

The minerals in county well water create everyday problems around your home. Iron stains clothes, fixtures, and surfaces with orange or brown marks. Sulfate gives water a bitter taste and can have a laxative effect. The moderately hard water causes scale buildup on pipes and fixtures, which can shorten the lifespan of water heaters and dishwashers over time.

We recommend testing your well right away since every well is different and yours could have higher or lower levels than what is common here. A comprehensive metals and minerals panel costs between two hundred and four hundred dollars and is the only way to know what is actually in your water so you can treat it properly. Treatment options like reverse osmosis, activated carbon filters, or ion exchange systems can address multiple contaminants depending on your results.