# Appendix B

NPDES Applicator and Application EstimatesThe following table provides EPA’s current estimates of the number of applicators and applications of

pesticides that fall within pesticide use patterns that result in the application of pestic ides to and over, including near, waters of the United States. The information has not undergone peer review , and EPA intends to update these estimates as additional data become available. There are two ma in limitations to the data provided. First, there is not a direct source of information on the number of applicators and applications made for these pesticide use patterns. As a result, the estimates were derived from secondary sources of information, and generalizing assumptions were sometimes made

. Th e second limitation is that the definition of an application and an applicator is derived from the best available data by use pattern . Therefore the definition may be different by use pattern

. More detail, by pesticide use pattern , is provided in the calc ulation notes. Following the table is a listing of information sources used in EPA’s estimation of the number of pesticide applicators and applications. Information sources are l isted by pesticide use pattern. **NPDES Applicator & Application Estim ates** 

**Us e**  **Patterns Number**  **of**

**Applicators Number**  **of**

**Applications Calculation Notes**  Mosquito Adulticides 1,200 461,450 There are 400 mosquito abatement districts and approximately 800 other public agencies that apply mo squito control pesticides

-- it is assumed that each represents an applicator. There w ere 103 million acre

treatments with insecticides in 2005 (99 million for adulticides and 4 million for larvicides). Assuming that 77% of adulticide application s are made by ground and 23% are made by air and that an average adulticide application by ground covers 180 acres and that an adulticide application by air covers 600 acres, there are an estimated 461,450 annual adulticide applications. Mosquito Larvicides 1,200 18,800 There are 400 mosquito abatement district s and approximately 800 other public agencies that apply mo squito control pesticides

-- it is assumed that each represents an applicator. There w ere 103 million acre

treatments with insecticides in 2005 (99 million for adulticides and 4 million for larvicid es). Assuming that 77% of larvicide application s are made by ground and 23% are made by air and that an average larvicide application by gro und covers 180 acres and that a larvicide application by air covers 600 acres, there are an estimated 18,800 annual larvicide applications. Aquatic Weed Control

- Lakes and Ponds 23,200 4,524,000 OPP data show approximately 23,200 applicators holding certification in the aquatic category. The estimate of applications to lakes, ponds, irr igation systems and waterways is the result of 23,200 multiplied by 1 application per day over 195 work days (5 work days per w eek multiplied by 3 9 w eeks [9 mo nths of the year] ) , which equals 4,524 ,000 applications per year. EPA cannot determine what applications are made to each site , so one overall number has been calculated fo r all aquatic weed control in lakes, ponds, irrigation systems, and waterways

.**Us e**  **Patterns Number**  **of Applicators**  **Number of** 

**Applications Calculation Notes**  Aquatic Weed Control

- Irrigation Sy stems and Waterways See Aquatic

Weed Control

- Lakes and Ponds See Aquatic

Weed Control

- Lake s and Ponds See Aquatic Weed Control

- Lakes and Ponds

Aquatic Weed Control

– Ditchbanks 330,000 660,000 About 15%, or 330,000, of 2.2 million U.S. farms are irrigated. EPA assumes that each farm is treated twice per year. This d oes not account for types of irrigation. Aquatic Nuisance Animal Control Not

Available Not

Available Includes use of pesticides for the control of fish,

lam prey s, and mollusks. EPA currently does not have an estimate of the number of applicators and applications within this use pattern. Wide Area Pest Control

- Insects 170 5,000 Based on grass hopper & Mormon cricket control. E stimate of 5 million acres treated with a minimum of 1,000 acres per application. This is a low estimate because it does not include east of the Mississip pi, and parts of w est. Number of applicators is based on NAAA survey estimate of available aircraft. Wide Area Pest Control

- Invasive Weeds 5,000 10,000 Herbicides are usually not feasible for control of large wide area infestations. They are most likely used to control and/or eradicate smaller new er infestations. Applicators may be individual land owners or government agencies. No data is available for number of applicators and applications, but EPA estimates that there are at least 5,000 applicators and 10,000 applications, and that these estimate s may be low

. Forestry 4,500 4,500 There are 5,175 tracts of forest in the U.S. and 2.7 million acre s of forest are treated per year. Assuming that an average pesticide application to forests is 600 acres (ba sed on NAAA survey ), the number of applications is calculated as the number of acres treated per year divided by the number of acres treated per application

. It is assumed that the 4,500 applications are evenly distributed across the 5,175 forest tracts, thus it is assumed that there is one applicator per treated tract. The estimate of the num ber of applications and applicators may be low because data are not available on pesticides applied by ground. Total 365,270 5,683,750**NPDES Applicator &**  **Applicati on Inform**  **ation Sources**

**Mosquito Control** CDC, 2009. Infectious disease information: Mosquito

- borne diseases. U.S. Centers for Disease Control and Prevention

. Available online at: htt p://www.cdc.gov/ncidod/diseases/list_mosquitoborne.htm EPA Proprietar Marketing Research Data. EPA and CDC, 2007. Joint statement on mosquito control in the United States. U.S. Environmental Protection Agency and the U.S. Centers for Disease Control and Prevention . Available online at: http://www.epa.gov/opp00001/health/mosquitoes/mosquitojoint.htm Florida Coordinating Council on Mosquito Control, 1998. Florida mosquito c ontrol: The state of the mission as defined by mosquito controllers, regulators, and environmental managers, University of Florida, Vero Beach, FL. NAAA, 2004. Pesticide use survey report for agricultural aviation. National Agricultural Aviation Associati on, Washington, DC. University of Florida, IFAS Extension,(undated). Integrated mosquito management (IMM). Florida Medical Entomology Laboratory . Available online at: http://mosquito.ifas.ufl.edu/Integrated_Mosquito_Management.htm **Aquatic Weed Control** Baker Hughes Incorporated, 2004. MAGNACIDE ® H h erbicide: Most cost e ffective a quatic w eed c ontrol

. Available online at: http://www.bakerhughesdirect.com/cgi/hello.cgi/BPC/public/agriculture/pdf/BakerPetrolie_costeffective.pd f Bronzini, Michael S., 1997. Inland waterways: Still or t urbulent w aters ahead? Annals of the American Academy of Political and Social Science , Vol. 553, Transport at the Millennium (Sep., 1997), 66

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. California Department of Pesticide Regulation. Pesticide Information Portal, 2009. Pesticide Use Reporting . Available online at: http://www.cdpr.ca.gov/docs/pur/purmain.htm EPA Proprietar Marketing Research Data. EPA. 2007. Survey of the Nation’s l akes: A f act s heet for c ommunities. U.S. EPA, Office of Water, National Lak es Assessment . Available online at: http://epa.gov/owow /lakes/lakessurvey/ Smith, S.V., W.H. Renwick, J.D. Bartley, and R.W. Buddenmier , 2002. Distribution and significance of sm all, artificial wat er bodies across the United States landscape. The Science of The Total Environment

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- 36. University of Kentuchy , 2009. Aquatic w eed c ontrol. Univ. of Kentucky Pesticide Education Program

. Available online at: http://www.uky.edu/Ag/PAT/cat5/cat5.htm U.S. Census Bureau, 2003. 2002 Census of Governments , Volum e 1, Number 1, Government Organization , GC02(1)

- 1, U.S. Government Printing Office, Washington, DC . Available online at: http://www.census.gov/prod/2003pubs/gc021x1.pdf USDA NASS, 2005 Census of Aquaculture, Volume 3, Special Studies, Part 2, AC

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Statistic s Service . Available online at: http://www.agcensus.usda.gov/ **Wide Area Pest Control** Evans, E.W. and E.W. Hodgdon, 2008. Grasshoppers , Utah Pests Fact Sheet ENT

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. Utah State U. Extension and Utah Plant Pest Diagnostic Laboratory, June 2008. NAAA , 2004. Pesticide use survey report for agricultural aviation. National Agricultural Aviation Association, Washington, DC. Plant Protection Act, Public Law 106

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. USDA/APHIS. 2002. Rangeland Grasshopper and Mormon Cricket Suppression Program, Final Envir onmental Impact Statement

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