Well Water in Mercer County: What to Test and Why

Groundwater in Mercer County contains manganese, iron, arsenic, chloride, nitrite, and sulfate. Several of these contaminants exceed EPA health standards, making this a serious concern for well owners.

The rock beneath Mercer County naturally contains these metals locked inside. As groundwater slowly moves through cracks in the rock, it dissolves iron and manganese. Arsenic sits trapped in the same stone. Chloride and sulfate also build up as water sits in contact with minerals in the bedrock.

Groundwater in this county is very hard, driven by elevated calcium and magnesium from the carbonate rock below, combined with high sodium and sulfate. The minerals dissolve naturally as water moves through the limestone and dolomite. These hard-water and elevated-mineral characteristics are widespread across wells in the county.

Wells in Mercer County contain several contaminants that exceed EPA health standards. Arsenic, chloride, nitrite, and iron can cause serious health problems with long-term exposure. Arsenic is particularly concerning because it has no taste or smell and builds up in your body over time, increasing the risk of cancer and organ damage. Nitrite affects how blood carries oxygen, which is especially dangerous for infants and young children. Manganese at elevated levels can harm brain development in children.

The extremely hard water in this county creates significant quality-of-life problems. You will see thick white crusty buildup on faucets, showerheads, and inside pipes. Iron causes orange and rust-colored stains on sinks, toilets, and laundry. The high sulfate levels may give your water a bitter or salty taste. This extreme hardness can shorten the lifespan of water heaters, dishwashers, and other appliances.

We recommend testing your well as soon as possible. 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 is actually in your water so it can be properly treated. Given the multiple contaminants exceeding health standards, we recommend a comprehensive metals and minerals panel, which typically costs $200-400. Treatment options include a water softener combined with an arsenic-removal system or whole-house filtration designed for multiple contaminants.