Phosphorous is an important nutrient for plant growth but is naturally abundant in our soils.  Fertilizers, grass clippings, leaves, eroded soil and animal waste are all sources of phosphorous.  When excess phosphorous is applied to soil, it can wash off into nearby lakes and streams where it accelerates algae growth.  Excessive algae growth diminishes water quality and can cause problems for fish and other aquatic life.

A new State law enacted in 2003 restricts use of phosphorous fertilizers in Minnesota..  Starting January 1, 2004, lawn fertilizers containing phosphorous cannot be used in the 7-county metro area, including Hennepin County.  Orono residents must use non-phosphorous fertilizers - look for the fertilizer bags with a middle number of "0", such as 22-0-12.

You can do your part to protect water quality by doing the following:

ü   Do not rake leaves, grass clippings and lawn debris into streets or ditches.  By all means, do not discard these materials in the lake or other surface waters.

ü   Follow Minnesota's new phosphorous-free lawn fertilizer law.  

ü   Pick up pet waste promptly, as it can contain harmful bacteria as well as nutrients.  Never drop pet waste in the street or ditches.

ü   Control soil erosion around your house.  Bare soil is easily washed away with rain, carrying phosphorous with it.  Prevent soil erosion by keeping soil covered with vegetation or mulch.

ü   Lakeshore owners can establish a buffer area of higher vegetation 10-20' wide along the shoreline to allow for runoff filtration and nutrient retention.