Under the U.S. Clean Water Act (CWA), every state must adopt water quality standards to protect, maintain and improve the quality of the nation’s surface waters. Therefore, water quality is uniquely regulated in several states. Some states, such as California and Arizona, have specific scientific studies that are required to be submitted when registering a product. Other states, such as Florida, New York, Washington and New Jersey, require data or data summaries prior to approval of product use within certain regions of their states. Though groundwater contamination concerns from the 1980’s have initiated a broad range of regulatory oversight of products in a majority of the states, concerns regarding surface water quality are the most rapidly expanding area of regulation, particularly in how these regulations are coupled to mandates under the CWA.