The Drinking Water Contaminants of Emerging Concern (CEC) program identifies environmental contaminants for which current health-based standards currently do not exist or need to be updated, investigate the potential for human exposure to these chemicals, and develop guidance values for drinking water. Contaminants evaluated by CEC staff include contaminants that have been released or detected in Minnesota waters (surface water and groundwater) or that have the potential to migrate to or be detected in Minnesota waters.
Arsenic occurs naturally in soil and minerals and is commonly found in groundwater throughout much of Minnesota. The occurrence and distribution of arsenic in groundwater is difficult to predict. Research is steadily increasing our understanding of the mechanisms and geologic conditions that determine arsenic occurrence in groundwater. The arsenic concentration in a new well, measured at the time of construction, is sometimes higher or lower, compared to subsequent sampling results.
Approximately 70 percent of all Minnesotans rely on groundwater as their primary source of drinking water. Wells used for drinking water must be properly sealed when removed from service to protect both public health and Minnesota’s invaluable groundwater resources. The Minnesota Department of Health protects both public health and groundwater by assuring the proper sealing of unused wells.
Clean Water funds are being provided to well owners as a 50% cost-share assistance for sealing unused public water-supply wells.
Drill well to clear pump for borehole geophysical survey on well 2. Purchase spill response materials to be better prepared in case of spill or train derailment.
Identify and update Potential Contaminant Source Inventory to eliminate private wells with potential pathway for contamination. Purchase, replace 2 data loggers, 1 indicator for data collection equipment
Provide first half of rent payment to landowner to allow city to implement nitrogen BMPs on field. Purchase and custom seed rye to scavenge up the residual nitrogen in the soil to keep it from getting into groundwater.
Prepare preliminary engineering report to help identify feasibility of adding a second intake upstream of current intake.
Prepare preliminary engineering report to help identify feasibility of adding a second intake upstream of current intake.
