Nitrates  - 2002
    Data cells represent forty acre units where well water samples were tested for nitrate levels.  The legend represents values from 0-150 parts per million (ppm) or milligrams per liter (mg/L).  Nitrate levels are reported as "nitrates as nitrogen" with an established EPA limit of 10 ppm.  Values appearing as light blue or lighter blue are over the limit.  The south and west parts of the district generally show levels at or above established limits.