1. Water Quality Program Pesticides in Groundwater A Summary of What’s in DEQ’s Database March 16, 2016 2016 Oregon Pesticide Symposium Salem, Oregon Phil Richerson | Oregon Department of Environmental Quality

2. Statewide Pesticide Use What’s NOT in DEQ’s Database Groundwater Pesticide Data in DEQ’s Database What Have We Looked For Where Have We Looked What Have We Found Today's Topics

3. Statewide Pesticide Use Roundup was an analyte in 206 samples collected from two GWMAs and 4 ambient studies. All results were BDL.

4. What’s NOT in DEQ’s Database Cleanup Sites Public Drinking Water Suppliers Source Area Assessments Data from other sources USGS ODA lab database Today's Topics In other words, this is NOT a comprehensive look at all groundwater pesticide data in the State.

5. 222 analytes Current Use (e.g., dacthal, atrazine) Legacy (e.g., DDT) Results from 1991 through 2015 Analyte lists have changed over time Based on EPA’s Pesticides of Interest Modified as pesticides come and go and test methods are developed What Have We Looked For

6. 3 Groundwater Management Areas Ambient Groundwater Study Areas Landfills Miscellaneous Sites (e.g., Alkali Flat) Where Have We Looked

8. Northern Malheur County GWMA Lower Umatilla Basin GWMA Southern Willamette Valley GWMA North Coast Ambient Study Alkali Lake Haz Waste Site Milton- Freewater Ambient Study Burns Ambient Study Baker Landfill Agate Beach Landfill Port Orford Landfill Box Canyon Landfill City of Spray Crook County Landfill S. Deschutes / N. Klamath Ambient Study Rogue Basin Ambient Study Klamath Falls Landfill Lake County Landfill

9. Northern Malheur County GWMA Lower Umatilla Basin GWMA Southern Willamette Valley GWMA North Coast Ambient Study Alkali Lake Haz Waste Site Milton- Freewater Ambient Study Burns Ambient Study Baker Landfill Agate Beach Landfill Port Orford Landfill Box Canyon Landfill City of Spray Crook County Landfill S. Deschutes / N. Klamath Ambient Study Rogue Basin Ambient Study Klamath Falls Landfill Lake County Landfill LUBGWMA Alachlor Atrazine Atrazine-Desethyl Atrazine-Desisopropyl Bentazon Bromacil Dacthal DEET Dicamba Diuron Endosulfan sulfate Imazapyr Imidacloprid Methomyl Metolachlor Metribuzin Pentachlorophenol Phenoxyherbicide Screen Picloram Prometon Propazine Simazine Tebuthiuron

10. Northern Malheur County GWMA Lower Umatilla Basin GWMA Southern Willamette Valley GWMA North Coast Ambient Study Alkali Lake Haz Waste Site Milton- Freewater Ambient Study Burns Ambient Study Baker Landfill Agate Beach Landfill Port Orford Landfill Box Canyon Landfill City of Spray Crook County Landfill S. Deschutes / N. Klamath Ambient Study Rogue Basin Ambient Study Klamath Falls Landfill Lake County Landfill SWV GWMA 2,6-Dichlorobenzamide 4,4`-DDT Alachlor Atrazine Atrazine-Desethyl Bromacil Clopyralid Deisopropylatrazine Desethylatrazine Diazinon Diuron Ethofumesate Imidacloprid Malathion Metolachlor Metribuzin Norflurazon Picloram Simazine Terbacil Triclopyr

11. Northern Malheur County GWMA Lower Umatilla Basin GWMA Southern Willamette Valley GWMA North Coast Ambient Study Alkali Lake Haz Waste Site Milton- Freewater Ambient Study Burns Ambient Study Baker Landfill Agate Beach Landfill Port Orford Landfill Box Canyon Landfill City of Spray Crook County Landfill S. Deschutes / N. Klamath Ambient Study Rogue Basin Ambient Study Klamath Falls Landfill Lake County Landfill Rogue Basin 2,4´-DDD 2,6-Dichlorobenzamide 4,4´-DDD 4,4´-DDE 4,4´-DDT Acetamiprid Atrazine Deisopropylatrazine Desethylatrazine Diuron Heptachlor epoxide Norflurazon Pentachlorophenol Prometon Simazine

12. Northern Malheur County GWMA Lower Umatilla Basin GWMA Southern Willamette Valley GWMA North Coast Ambient Study Alkali Lake Haz Waste Site Milton- Freewater Ambient Study Burns Ambient Study Baker Landfill Agate Beach Landfill Port Orford Landfill Box Canyon Landfill City of Spray Crook County Landfill S. Deschutes / N. Klamath Ambient Study Rogue Basin Ambient Study Klamath Falls Landfill Lake County Landfill NMC GWMA 4,4`-DDD 4,4`-DDE 4,4`-DDT Aldrin Atrazine Atrazine-Desethyl Atrazine-Desisopropyl Bentazone Bromacil Bromomethane Cycloate Dacthal DEET delta-BHC Dieldrin Dinoseb Diuron Endosulfan I Endosulfan II Endosulfan sulfate NMC GWMA Endrin Endrin Ketone Heptachlor Heptachlor epoxide Hexazinone Imazapyr Metalaxyl Methoxychlor Metolachlor Metribuzin Nitrogen/Phos. Screen Pendimethalin Phenoxyherbicide Screen Prometon Simazine Terbacil Triclopyr

13. Northern Malheur County GWMA Lower Umatilla Basin GWMA Southern Willamette Valley GWMA North Coast Ambient Study Alkali Lake Haz Waste Site Milton- Freewater Ambient Study Burns Ambient Study Baker Landfill Agate Beach Landfill Port Orford Landfill Box Canyon Landfill City of Spray Crook County Landfill S. Deschutes / N. Klamath Ambient Study Rogue Basin Ambient Study Klamath Falls Landfill Lake County Landfill Alkali Lake Site 2,4,5-T 2,4-D 2,4-DB 3,5-Dichlorobenzoic acid Bentazon Chloramben Dicamba Dichloroprop Dinoseb MCPA MCPP Pentachlorophenol Picloram Silvex

14. 79 of 222 pesticides detected at least once (36%) Pesticides were detected in about 2.5% of samples (2,540 out of 100,737) What Have We Found

15. Top 25 Pesticides Detected Analyte#Use Dacthal1525Herbicide Atrazine-Desethyl209Herbicide Atrazine150Herbicide Phenoxyherbicide Screen75Herbicide Simazine51Herbicide Desethylatrazine35Herbicide Bromacil33Herbicide Diuron33Herbicide Deisopropylatrazine32Herbicide Metribuzin31Herbicide MCPA27Herbicide 2,6-Dichlorobenzamide26Herbicide Prometon25Herbicide Metolachlor21Herbicide 2,4-D19Herbicide 2,4,5-T14Herbicide DEET13Insecticide MCPP12Herbicide Dicamba11Herbicide Picloram11Herbicide Silvex11Herbicide Malathion10Insecticide 2,4-DB9Herbicide Pentachlorophenol9Insecticide and Fungicide Terbacil9Herbicide

16. The End Any Questions? (541) 278-4604 Phil.Richerson@state.or.us