Environmental and resource quality recently have become special public concerns. A few states have already enacted legislation posing land use-environmental restrictions. Vermont, Hawaii, Colorado, Maine, Massachusetts and New York, passed land use laws. Illinois formed a Pollution Control Board to quantify nutrients and sediment polluting streams and suggest action. In 1971, the Iowa Legislature passed the “Conservancy District Act,” creating soil conservancy districts “to preserve and protect public interest in soil and water resources for future generations.” Legislation centers on soil erosion and sedimentation. Erosion is declared a nuisance if it results in siltation damage. The law sets allowable soil loss limits on land at one to five tons per acre per year, depending on soil type.