Saint Paul, MN - June 26, 2013 - Minnesota's clean water advocates praised the Minnesota Pollution Control Agency today for its comprehensive study documenting the sources of nitrogen pollution that endanger Minnesota's drinking water, fish and aquatic habitat - and contribute to the Dead Zone in the Gulf of Mexico.
Working with the University of Minnesota and the U.S. Geological Society, MPCA tested more than 50,000 water samples as part of its extensive study of the causes of nitrogen pollution. In addition, the agency reviewed more than 35 years of monitoring data and findings from 300 published scientific studies.
Key findings included:
Drinking Water: Maximum levels of nitrates in Minnesota's rivers and streams exceeded the state's safe drinking water standards in 27 percent of monitored sites.
Fish & Habitat: Elevated nitrate levels can be harmful to fish and aquatic life threatening fish and habitat in rivers, lakes and streams.
Dead Zone: Minnesota is the sixth highest contributor of nitrogen to the Gulf of Mexico. Minnesota and other states must reduce nitrogen loading to reduce the devastating impacts of oxygen depleted waters in the Gulf, which adversely impacts commercial and recreation fishing as well as the overall health of the Gulf ecosystem.
Ag Cropland: 73 percent of the elevated nitrate levels come from cropland, primarily through agricultural drainage systems below cropped fields and by nitrate pollution leaching into groundwater, and then moving underground until it reaches streams.
"The level of change needed is sweeping," said Kris Sigford, water quality program director for Minnesota Center for Environmental Advocacy. "This study shows conclusively that the dramatic impacts to our waters from nitrate loads can only be addressed by large landscape-level changes to agricultural practices and cropping systems. This level of change cannot be achieved through traditional voluntary conservation programs subsidized by the general public. This study should serve as the impetus to jumpstart state policy approaches that are up to the task. The alternative is a degraded drinking water supply for Minnesotans and degraded fisheries for Minnesota and the Gulf of Mexico."
The study notes that up to a 13 percent reduction in nitrate pollution can occur if changes to fertilizer use are broadly adopted, but that additional and more costly practices also will be needed to make further reductions in order to restore our water quality and treat our downstream neighbors fairly.
MPCA points to two solutions that would make significant reductions in nitrogen pollution: 1) changes in the use of drainage systems under cropland - so that nitrogen collected from fields is slowed, filtered or diverted rather than heading directly into rivers and streams and groundwater; and 2) increased use of complementary cover crops in our corn and soybean fields and shifting some cropland away from such row crops to perennial crops that provide continual ground cover.
"The MPCA is on the right track in its recommendations to reduce nitrogen pollution," said Whitney Clark, executive director of Friends of the Mississippi River. "It is time to take real steps to protect our rivers and streams from the pollution delivered by tile drainage systems under cropland. These drainage systems deliver 37 percent of total statewide nitrogen water pollution."
"This is a game-changing study," said Steve Morse, executive director of the Minnesota Environmental Partnership. "These scientific findings cannot be denied. The verdict is in: current practices and approaches are inadequate to keep our water safe. The proof lies in the fact that nitrate concentrations have steadily increased in the Mississippi River since the mid-1970's. All the hard work and money that's been invested over the last 40 years to turn this around hasn't worked. The challenge before us is clear; we look to the Dayton Administration to work with concerned citizens and advocates, farm operators, the University and others to develop new measures that will protect the water we drink and the future of farming in Minnesota."
Other MEP member organizations commending the MPCA in the comprehensive nitrogen study include:
Minnesota Environmental Partnership is a coalition of more than 70 environmental and conservation organizations working together for clean water, clean energy and protection of our Great Outdoors. MEP engages state leaders, unites environmental efforts and helps citizens take action for the Minnesota they love.