​Beyond Pesticides
http://www.beyondpesticides.org/​

Beyond Pesticides – Least Toxic Control of Pests in the Home and Garden
http://www.beyondpesticides.org/alternatives/factsheets/index.htm​

Beyond Pesticides – Pesticide-Induced Diseases Database
http://www.beyondpesticides.org/health/​

Beyond Pesticides – Health Effects of 30 Commonly Used Lawn Pesticides
http://www.beyondpesticides.org/lawn/factsheets/30health.pdf​

California Department of Agriculture (CDFA) Fertilizing and Materials Program 

http://www.cdfa.ca.gov/egov/is/fert/

Cornell University, Department of Horticulture, Cornell Turfgrass

http://www.hort.cornell.edu/turf/

Environmental Working Group
http://www.ewg.org/​

EPA
http://www.epa.gov/pesticides/lawncare/​

Healthy Yards, Healthy Lawns, Health Environment
http://www.epa.gov/reg3wcmd/pesticideslawn.htm​

Heavy Metal Analysis in Fertilizers Distributed in Minnesota
http://www.mda.state.mn.us/chemicals/fertilizers/heavymetals.aspx​

How Many Pets are Poisoned by Lawn Pesticides?
http://www.thedailygreen.com/environmental-news/latest/pets-pesticides-47010505​

Is Herbicide Exposure Placing Your Pets at Risk
http://www.ecochem.com/t_lawnchemicals_pet.html​

Metal Content Analysis Information (WA, OR or CA)
http://www.aapfco.org/metals.htm​

Minnesota Department of Health
http://www.health.state.mn.us/divs/eh/risk/studies/metals.html​

​Northeast Organic Farming Association
http://www.nofa.org/

Oregon Department of Agriculture 
http://www.oda.state.or.us/dbs/heavy_metal/search.lasso

PAN Pesticide Database
http://www.pesticideinfo.org/​

Pesticide Action Network North America  

http://www.panna.org/

Pesticide, Fertilizers Mixes Linked to Range of Health Problems
http://www.pmac.net/pesticides_fertilizers.html​

Rodale Institute
http://www.rodaleinstitute.org/​

Safe Fertilizer Information Institute
http://www.saffii.com/index.php/Safe_Fertilizer_Information_Institute_Home​

Safe Lawns
http://www.safelawns.org

Safer Pest Control Project
http://www.spcpweb.org/​

USDA Natural Resources Conservation Service – Soil Food Web
http://soils.usda.gov/sqi/concepts/soil_biology/soil_food_web.html​

University of Illinois Extension– Soil Testing Labs
http://www.urbanext.illinois.edu/soiltest/​ 
  Washington State Department of Agriculture Commercial Fertilizer Database

​http://apps.ecy.wa.gov/fertilizer/

Washington State Department of Ecology Fertilizer Database

http://www.apps.ecy.wa.gov/fertilizer/index.html

Wastelands –The Threat of Toxic Fertilizers
 http://www.pirg.org/toxics/reports/wastelands/​