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Publication #SL95

St. Johns County: Soil Ratings for Selecting Pesticides1

G.W. Hurt and T.A. Obreza2


Resource soil scientists with the U. S. Natural Resources Conservation Service have rated the soils that are delineated by map units in the St. Johns County Soil Survey Report2 for their potential for leaching and runoff of pesticides. The rating criteria are given in a companion publication entitled "Soil Ratings for Selecting Pesticides for Water Quality Goals." These soil ratings have been developed to help pesticide users determine the potential for pesticides to be lost to groundwater or surface water bodies.

As explained in Circular 9591, factors that determine pesticide leaching ratings in soil are permeability and the occurrence of mucky layers in the upper 80 inches of the soil. Soils rated High have a high potential for pesticides to leach to groundwater, soils rated Medium have a medium potential for pesticides to leach to groundwater, and soils rated Low have a low potential for pesticides to leach to groundwater. Factors that determine pesticide runoff ratings from soils are hydrologic group, permeability, and slope. Soils rated High have a high potential for pesticide runoff, soils rated Medium have a medium potential for pesticide runoff, and soils rated Low have a low potential for pesticide runoff.

NOTE: The user may discover that one or more map unit names in Table 1 have been updated from names given in the legend of the soil survey report2. For example, a soil map unit may be listed in the survey report with a single soil series name, whereas the same soil map unit is shown as comprising two or more soil series in Table 1 (sequence numbers 1, 2, 3, ..) Where this occurs, the user should use the multi-named map unit given here, and make pesticide selections based on the most limiting condition to be found on the land in question. If necessary, the local Natural Resources Conservation Service office should be contacted to perform an on-site evaluation of the land in question.


  1. Obreza, T.A. and G. W. Hurt. 2006. Soil Ratings For Selecting Pesticides For Water Quality Goals. Circular 959, Soil and Water Science Department, Cooperative Extension Service, University of Florida, Gainesville, Florida, 32611. 5pp.

  2. Soil Survey of St. Johns County, Florida. USDA/NRCS in cooperation with University of Florida, Institute of Food and Agricultural Sciences, Agricultural Experiment Stations, Soil and Water Science Department and the Florida Department of Agriculture and Consumer Services.


The development of this document was supported by the USDA/ES Water Quality Initiative Project # 89EWQI-1-9134.


Table 1. 

Soil Ratings for St. Johns County (see footnotes for explanations of column headings).







109001 1 1 ADAMSVILLE High Medium
109002 1 2 ASTATULA High Low
109003 1 3 MYAKKA Medium High
109004 1 4 MYAKKA Medium High
109005 1 5 ST. JOHNS Medium High
109006 1 6 TAVARES High Low
109007 1 7 IMMOKALEE Medium High
109008 1 8 ZOLFO Medium Medium
109009 1 9 POMONA Low High
109011 1 11 SMYRNA Medium High
109012 1 12 ONA Medium High
109013 1 13 ST. JOHNS Medium High
109014 1 14 CASSIA Medium Medium
109015 1 15 POMELLO Medium Medium
109016 1 16 ORSINO High Low
109018 1 18 FLORIDANA Low High
109019 1 19 POMPANO High High
109021 1 21 WABASSO Low High
109022 1 22 MANATEE Low High
109023 1 23 PAOLA High Low
109024 1 24 PELLICER Low High
109025 1 25 PARKWOOD Low High
109026 1 26 SAMSULA Medium High
109027 1 27 ST. AUGUSTINE High Medium
109028 1 28 BEACHES High High
109029 1 29 SATELLITE High Medium
109030 1 30 WESCONNETT Medium High
109031 1 31 FRIPP High Low
109031 2 31 SATELLITE High Low
109032 1 32 PALM BEACH High Low
109033 1 33 JONATHAN Low Medium
109034 1 34 TOCOI Medium Medium
109035 1 35 HONTOON Medium High
109036 1 36 RIVIERA Low High
109038 1 38 PITS High High
109040 1 40 POTTSBURG Medium High
109041 1 41 TOMOKA Medium High
109042 1 42 BLUFF Low High
109044 1 44 SPARR Medium Medium
109045 1 45 ST. AUGUSTINE High Medium
109046 1 46 HOLOPAW Medium High
109047 1 47 HOLOPAW Medium High
109048 1 48 WINDER Low High
109049 1 49 MOULTRIE Medium High
109050 1 50 NARCOOSSE High Medium
109051 1 51 ST. AUGUSTINE High Medium
109051 2 51 URBAN LAND Medium High
109052 1 52 DURBIN Medium High
109053 1 53 IMMOKALEE Medium High
109053 2 53 URBAN LAND Medium High
109054 1 54 ASTATULA High Low
109054 2 54 URBAN LAND Medium High
109055 1 55 ARENTS High Low
109057 1 57 ADAMSVILLE High Medium
109058 1 58 EAUGALLIE Low High
109061 1 61 RIVIERA Low High
109062 1 62 FLORIDANA Low High
109063 1 63 PLACID High High
109064 1 64 ELLZEY Medium High
109065 1 65 RIVIERA Medium High
109066 1 66 TERRA CEIA Medium High
109067 1 67 TISONIA Low High
109068 1 68 WINDER Low Medium
109069 1 69 BAKERSVILLE Medium High
109072 1 72 WATER
MUID = Natural Resources Conservation Service's map unit identifier.
SEQ NUM = Sequence Number, indicating a particular soil name among one or more names constituting a map unit name.
MUSYM = Map Unit Symbol from the soil map and legend in the Soil Survey of St. Johns County, Florida. Note that if a MUSYM appears more than once in this list it signifies that two or more soils are co-dominant in that map unit, and each such soil is rated separately here.
SOIL NAME = Name of soil or other landscape component (urban land, beaches, pits, water, etc.).
SOIL LEACH = The rating of the soil for leaching of pesticides through the soil profile.
SOIL RUNOFF = The rating of the soil for runoff of pesticides from the soil surface.
NOTE: See "Soil Ratings for Selecting Pesticides for Water Quality Goals" (IFAS Extension Circular 959) for explanations of the criteria used to develop soil ratings presented in the right-hand four columns of this list.



This document is SL95, a fact sheet of the Soil and Water Science Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Publication date: April 1991, revised September 2006. Reviewed June 2013. Please visit the EDIS website at


G.W. Hurt, National Leader for Hydric Soils, Natural Resources Conservation Service, USDA; T.A. Obreza, Professor, Soil and Water Science Department, University of Florida, Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611.

The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other UF/IFAS Extension publications, contact your county's UF/IFAS Extension office.

U.S. Department of Agriculture, UF/IFAS Extension Service, University of Florida, IFAS, Florida A & M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.