Well Water Guides

The county and state pages on this site estimate contaminant risk from USGS models. These guides cover the practical side: what a test result means, which treatment fits which problem, and where the federal reference levels come from.

• Well Water Hardness: Average Levels, Testing & When to Soften

  What "hard" means in mg/L and grains per gallon, the USGS hardness scale, where hard groundwater is common, and how to size a softener.

• Iron in Well Water: Staining, Test Levels & Treatment

  The EPA 300 µg/L secondary standard, the four forms of iron and which filter handles each, plus the counties where USGS sampling found iron over the limit most often.