The Washington State Department of Agriculture (WSDA) and Washington State Department of Ecology (Ecology) partner to oversee the use of waste ingredients in fertilizers. Wastes often contain nutrients for plants. Many of these are derived from relatively benign, natural sources, like manure. Some wastes may have toxic components, however.
Ecology's Hazardous Waste and Toxics Reduction Program examines the applications of any fertilizer that has waste as ingredients to determine that it is not dangerous waste before it may be registered as a fertilizer in Washington by WSDA.
The Waste-derived and Micronutrient Fertilizer Review Process describes what fertilizer producers must do in order to register their fertilizer in the State of Washington (Washington)
Standards for Maximum Allowable Levels of Metals in Fertilizer lists the limits adopted by Washington.
Wastes in Commercial Fertilizers Database is Ecology's database that offers information on analyses of waste-derived products by company, product, or waste to detect dangerous metals.
WSDA's Fertilizer Product Database Search for waste-derived and non-waste-derived fertilizers by product name or registrant for the concentrations the nine heavy metals for which Washington State has developed soil loading standards.
Current Laws and Rules:
Fertilizer Product Registration:
Fertilizer Product Registration at WSDA
Fertilizer Products Recommended for Approval By Ecology from July 1, 2015 – June 30, 2017
Metals in Fertilizers at WSDA
Copyright © Washington State Department of Ecology. See http://www.ecy.wa.gov/copyright.htm