Free nitrate testing for private well owners

The Olmsted County Soil and Water Conservation District (SWCD) and Olmsted County Public Health Services (OCPHS) are providing free water testing for households that rely on private systems for their drinking water. Free nitrate testing will be available at the Rochester Farmer’s Market on Saturday, June 24, 2023.

Water testing event details

• Date/Time: Saturday, June 24, 2023, from 7:30 a.m. to 12 p.m.
• Location: Graham Park, 35 Fairgrounds Avenue SE, Rochester

To participate, collect a cup of water from your well in a clean plastic bag or glass container and bring it to the Rochester Farmer’s Market. Your sample will be analyzed while you wait. Olmsted County SWCD and OCPHS staff will provide results to you within 15 minutes.

Olmsted County SWCD and OCPHS staff will be available to answer questions and recommend solutions if the water samples show elevated nitrate levels.

What is nitrate? 

Nitrate is a compound that naturally forms when nitrogen combines with oxygen or ozone. While nitrogen is essential for all living things, high nitrate levels (10mg/L) in drinking water could pose harmful risks, especially to infants and pregnant women. 

Nitrates can occur naturally in surface and groundwater without causing health problems. However, high nitrate levels in well water often result from improper well construction and location. Improper disposal of human and animal waste or the overuse of chemical fertilizers can further increase nitrate levels. Sources of nitrate that can enter your well include fertilizers, septic systems, animal feedlots, industrial waste, and food processing waste. After flooding, wells could become more vulnerable to contamination, especially if the wells are shallow, poorly constructed, dug or bored, or submerged by floodwater for long periods.