N.J. Admin. Code § D

Current through Register Vol. 54, No. 7, April 4, 2022


Explanation of the Soil Suitability Classification System

The suitability of soil for onsite disposal of sanitary wastewater by means of individual subsurface sewage disposal systems is classified based upon the type and depth of soil limiting zones as outlined below. Definitions and criteria for recognition of soil limiting zones are provided in Subchapters 2 and 5 of this chapter.

Type of Limiting Zone Depth, Suitabilit
ft. y Class
Fractured Rock or Excessively [GREATER THAN]5 I
Coarse Substrata 0-5 IISc
Massive Rock or Hydraulically [GREATER THAN]9 I
Restrictive Substrata 4-9 IISr
0-4 IIISr
Hydraulically Restrictive Horizon, [GREATER THAN]9 I
Permeable Substratum 4-9 IIHr
0-4 IIIHr
Excessively Coarse Horizon [GREATER THAN]5 I
0-5 IIHc
Zone of Saturation, Regional [GREATER THAN]5 I
2-5 IIWr
0-2 IIIWr
Zone of Saturation, Perched [GREATER THAN]5 I
2-5 IIWp
0-2 IIIWp

The soil suitability classification consists of a Roman numeral from I to III which is indicative of the severity of the limitation and a letter symbol which indicates the type of limiting zone. (In general the limitation is considered more severe when the limiting zone occurs at a shallower depth in or below the soil profile). Where more than one type of limiting zone is present, the primary classification of the soil is based upon whichever limiting zone(s) presents the most severe limitation (highest numerical symbol). Secondary limitations are given based upon limitations which are less severe (lower numerical symbols). The primary classification is stated first, followed by secondary classifications in parentheses. For example, the classification for a soil with a seasonally high water table (top of a regional zone of saturation) at a depth of 1.5 feet and a massive rock substratum at a depth of 7 feet would be IIIWr(IISr).

Where two or more limiting zones are present with the same degree of limitation, a compound symbol is used in primary or secondary classifications, consisting of a Roman numeral showing the degree of limitation together with a letter symbol for each type of limited zone. For example, the classification for a soil with a seasonally high water table at a depth 2.5 feet and a fractured rock substratum at a depth of 3 feet would be IIWrSc.

Soil Suitability Classes of New Jersey Soil Series

The type of standard septic system installation, if any, which can be approved on a specific site depends upon the soil suitability class which must be determined based upon detailed onsite soil evaluation. Such evaluation is costly and would normally not be performed prior to the purchase of land or the granting of preliminary or conceptual approvals for large tracts of land which are to be subdivided for residential or commercial development. In these or other situations where more general information regarding soil suitability is required, preliminary determinations may be made based upon information contained in the county soil surveys which are published by the U.S.D.A.--Soil Conservation Service in cooperation with the N.J. Agricultural Experiment Station and Cook College of Rutgers, The State University. These soil surveys contain descriptions of the various soil series which occur in New Jersey together with maps showing the geographic distribution of the soils. At present, published soil surveys or preliminary field maps are available for every county in the state with the exception of Essex and Hudson.

A soil series is a group of similar soil types having major horizons which are similar in thickness, arrangement and other important characteristics. The soil suitability classes provided for each New Jersey soil series listed below are based primarily upon the soil profile descriptions given in the soil survey reports.

Soil series may be divided into one or more soil phases which differ in the texture of the surface horizon, stoniness or some other property. Although soil phase differences may affect design and construction requirements, they are generally not a factor in determination of the soil suitability class given for a particular soil series. In some cases a soil series may have one or more variants which may differ significantly with respect to the types or depths of soil limiting zones. In such cases each variant is treated as a separate soil type with respect to the classification.

Each soil series is characterized by a range of soil profile characteristics so that two or more soil suitability classes may be possible for a given soil series. The soil suitability classes given below are those which are considered most typical for a given soil series. Other soil suitability classes are possible depending upon conditions which may vary from location to location.

Soil survey maps delineate the boundaries of soil mapping units in which a specific soil series, soil phase, soil complex, association or other grouping is predominant. Within every soil mapping unit however, there may be areas of dissimilar soils which are too small and scattered or otherwise impractical to show at the scale of mapping used. For this reason, use of the soil survey is not a substitute for onsite soil evaluation when detailed information for a specific site is required.

Many soil series in the coastal plain region of southern New Jersey are underlain by stratified sedimentary formations which consist of layers of contrasting grain size. In some cases layers of highly permeable sand and gravel may alternate with hydraulically restrictive layers of silt and clay. Where hydraulically restrictive layers occur at depths less than nine feet they will be a determining factor for the soil suitability classification. The presence of such layers below a depth of five feet however, is generally not indicated in the soil survey reports and therefore may not be reflected in the soil suitability classes given here. As a result, coastal plain soils series which are classified as having no limitation (Roman numeral I) with respect to hydraulically restrictive horizons and substrata may in some locations have IIHr or IISr limitations. In other cases, soil series which are assigned classifications of IISr or IIISr may in some locations have permeable substrata at depths below the extent of soil survey data such that a classification of IIHr or IIIHr may be appropriate.

In the northern portion of the state many soil series are described as having bedrock substrata at shallow depths below the soil profile. Soil survey reports generally do not provide information relative to the permeability of these rock substrata. Rock substrata underlying soil profiles of the same soil series may often range from excessively permeable to relatively impermeable. Soil suitability classes are given to represent those conditions which are considered most typical for a soil series. In many cases, however, soil series which are given classes of I or IISc may in some locations have the more severe limitations associated with classes IISr or IIISr. Classifications of rock substrata given here must be regarded as preliminary in nature and may be subject to modification based upon detailed onsite evaluation and testing.

Soil Series (Variant) Name Typical Classification(s)
Abbottstown IIIHR,Wp(IIISc);IISr,Wp(IIISc)
Adelphia IIWr
Adelphia Clayey Substratum IIISr(IIWr)
Adelphia Glauconitic Variant IIISr(IIWr)
Adelphia Truncated IIIWr
Adrian IIIWr
Albia IIIHr,Wp; IIISr,Wp
Amwell IIIHr,Wp; IIIHr,Wp(IISr)
Amwell Rock Substratum IIIHr,Wp; IIIHr,Wp(IISr)
Annandale IIIHr
Arendtsville I; IISc
Atherton IIIWr
Athol I
Atsion IIIWr
Atsion Tide Flooded IIIWr
Aura I; IIHr
Aura Moderately Firm I; IIHr
Aura Ironstone Variant I; IIHr
Barclay IIWr; IIIWr
Bartley IIIHr(IIWp)
Bath IIIHr(IIWpSc)
Bath Stony IIIHr(IIWpSc)
Bayboro IIISrWr
Bayboro Ponded IIISrWr
Bedington IISc
Berks IISc
Berryland IIIWr
Berryland Flooded IIIWr
Berryland Freq. Flooded IIIWr
Berryland Heavy Subsoil Var. IIIWr
Bertie IIIWr
Bibb IIIWr
Biddeford IIISrWr
Birdsboro I; IIWr; IISc; IIWrSc
Birdsboro Gravelly Solum Var. I
Birdsboro Sandy Subsoil Var. IISc
Boonton IIIHrWp; IIISrWp
Bowmansville IIIWr
Braceville IIIHrWp
Bucks IISc; IISr
Califon IIIHrWp
Califon Friable Subsoil Var. IIIWr
Carisle Muck IIIWr
Chalfont IIISrWp
Chenango IISc
Chillum I; ISc; IIISr
Chippewa IIISrWr
Cokesbury IIIHrWp
Colemantown IIIHrWp
Collington I
Colonie I
Colts Neck I, IIHr
Croton IIISrWp; IIISrWr
Donlonton IIIHrWr
Downer I
Downer Clayey Substratum I
Downer Gravelly Substratum I; IISc
Downer Loamy Substratum I
Downer Truncated I
Doylestown IIISrWr
Dragstown IIIWr; IIWr
Duffield I; IISr
Duffield Very Rocky IISr
Dunellen I
Dunellen Mod. Well Drained Var. IIIWr
Edneyville I; IISc
Elkton IIISrWr
Ellington Loamy Subsoil Var. IISrWpWr; IIISrWpWr
Evesboro I
Evesboro Clayey Substratum IIISr; IIIHr
Evesboro Sandy Loam Subsoil Var. I
Fallsington IIIWr
Fallsington Clayey Substratum IIIHr
Fallsington Var. IIIHrWrWp
Fort Mott I
Fredon IIIWr
Freehold I
Freehold Clayey Substratum IIISr
Fripp I
Galestown I
Galestown Clayey Substratum IISr
Haledon IIIHrWp
Haledon Wet Var. IIIHrWpWr
Halsey IIIWr; IIIWr(IISc)
Hammonton IIWr
Hammonton Clayey Substratum IIISr(IIWrWp);IIIHr(IIWrWp)
Hazen I; IISc
Hazleton IISc
Hero IIScWr; IIWr
Hibernia IIIHrWp
Holmdel IIIWr; IIWr
Holmdel Clayey Substratum IIISrWr
Holyoke Rocky IISc; IIISr
Hoosic I; IISc
Howell IIWr; IIIWr
Keansburg IIIWr
Keyport IIISr(IIWp)
Klej IIWr; IIIWr
Klej Clayey Substratum IIISrWr; IIISr(IIWr)
Klej Loamy Substratum IIISrWr; IIISr(IIWr)
Klinesville Shaly IISc; IISr
Kresson IIIHrWp(IIWr)
Lakehurst IIWr; IIIWr
Lakehurst Clayey Substratum IIISrWrWp;IIISr(IIWrWp)
Lakehurst Loamy Substratum IIWr; IIIWr
Lakehurst Thick Surface IIWr; IIIWr
Lakeland I
Lakeland Firm Substratum I
Lakeland Water Table IIWr
Lakewood I
Lakewood Loamy Substratum I
Lakewood Thick Surface I
Lamington IIIHrWpWr
Lansdale IISc
Lansdowne IIIHrWp(IISc);IIIHrWp(IISr)
Lansdowne Var. IIIHrWp(IISc); IIISrWp
Lawrenceville IIISrWp; IIIHrWp
Legore I; IISr
Lehigh IIISrWp; IIIHrWp(IISc)
Lenoir IIISrWr
Leon IIIWr
Livingston IIISrWr
Manahawkin IIIWr;
Marlton IIIHr(IIWp); IIIHr
Matapeake IIISr(IIWp); IISrWp; I
Matapeake Thin Solum I
Matawan IIWr; IIIHrWp(IIWr)
Mattapex IIISr(IIWr); IIWr
Mattapex Clayey Substratum IIISrWr
Mattapex Glauconitic Substratum IIWr
Meckesville IIIHr(IIWp)
Middlebury IIIWr
Minoa IIIWr
Mount Lucas IIIWp(IISr)
Mullica IIIWr
Mullica Loamy Substratum IIIWr
Nassau IIISr; IISc
Neshaminy IISr
Neshaminy Fragipan Var. IIISrWp; IIIHrWp
Netcong I
Nixon I
Nixon Var. IIWr; IIIWr
Nixonton IIIWr
Norton IIIHr
Norwich IIIHrWr
Oquaga IISc; IIISr(IISc)
Othello IIIWr
Otisville IISc
Palmyra IISc
Parker IISc
Parker Rocky IISc
Parsippany IIHrWr; IIISrWr
Parsippany Sandy Loam Substratum IIIHrWr
Parsippany Var. IIISrWr
Pasquotank IIIWr
Pattenburg IISc
Pattenburg Moderately Wet IIScWr; IIIWr(IISc)
Pemberton IIWr; IIIWr
Pemberton Thick Surface IIWr;IIIWr
Penn IISc; IIISr
Penn Shaly IISc; IIISr
Phalanx IISc
Plummer IIIWr
Plummer Very Wet IIIWr
Pocomoke IIIWr
Pompton IIIWr; IIIWr(IISc)
Pope I; IISc
Portsmouth IIIWr
Preakness IIIWr
Preakness Dark Surface Var. IIIWr
Quakertown IISc; I
Quakertown Channery IISc
Raritan IIIHrWp; IIIHrWp(IISc)
Raynham IIIWr
Readington IIIHrWp(IISc);IIWpSrSc; IIWrSc
Reaville IIISrWp(IIHc)
Reaville Deep Var. IIISrWp(IIHc)
Reaville Wet Var. IIISrWp(IIHc)
Ridgebury IIIHrWp
Riverhead I; IISc
Riverhead Neutral Var. I; IISc
Rockaway IIIHrWp
Rowland IIIWr
Royce IISc
Sassafras I
Sassafras Clayey Substratum IIISr; IISr; IIIHr; IIHr
Sassafras Water Table IIWr
Shrewsbury IIIWr
Shrewsbury Clayey Substratum IIIWrSr
Shrewsbury Ironstone Var. IIIWrHr
Shrewsbury Truncated IIIWr
Sloan IIIWr
Steinsburg IISc
St. Johns IIIWr
St. Johns Clayey Substratum IIIWrSr
Swartswood IIIHrWp
Tinton I
Tinton Thick Surface I;
Tioga I; IIWr; IIWrSc; IISc
Turbotville IIIHrWp
Unadilla I
Valois I
Venango IIIHrWp; IIISrWp
Wallkill IIIWr
Washington I; IISc
Wassaic IISc; IIISr
Wassaic Rocky IISc; IIISr
Watchung IIIHrWpWr
Wayland IIIWr; IIIWrSr
Weeksville IIIWr
Westphalia I
Whippany IIISrWp;
Whippany Sandy Loam Substratum IIIHrWp
Whitman IIIHrWp
Woodmansie I
Woodmansie Firm Substratum I
Woodmansie Loamy Substratum I
Woodstown IIIWr; IIWr
Woodstown Clayey Substratum IIIWrSr; IIIWr(IISr);IIWrSr;
Woodstown Loamy Substratum IIIWr; IIWr
Wooster IISc; I
Wurtsboro IIIHrWp; IIIHrWp(IISc)

Following is a listing of miscellaneous mapping unit designations which do not consist of any one specific soil series or soil series variant. In general these mapping units cannot be assigned a soil suitability class due to extreme variability or a lack of data. The type of limitations which are generally associated with these mapping units are indicated below:

Mapping Unit Designation Type(s) of Limitations
Alluvial Land (Various Modifying Terms) Flooding, Wetland
Clayey Land-Keyport Materials Hydraulically Restrictive Substrata
Clayey Land-Marlton Materials Hydraulically Restrictive Substrata
Clay Pits Disturbed Ground, Hydraulically
Restrictive Substrata
Coastal Beach Dunes, Excessively Coarse Substrata
Cut and Fill Land Disturbed Ground
Dune Land Dunes, Excessively Coarse Substrata
Fill Land (Various Modifying Terms) Disturbed Ground
Fluvaquents Flooding
Fresh Water Marsh Wetland
Gravel Pits Disturbed Ground, Excessively
Coarse Substrata
Humaquepts Wetland
Made Land (Various Modifying Terms) Disturbed Ground
Marsh (Various Modifying Terms) Wetland
Mine Dump Disturbed Ground
Muck (Various Modifying Terms) Wetland
Peat (Various Modifying Terms) Wetland
Pits (Various Modifying Terms) Disturbed Ground
Psamments Dunes, Excessively Coarse Substrata
Quarries Disturbed Ground
Rock Land-Edneyville Material Rock Outcrops, Excessively
Coarse Substrata
Rock Outcrop Rock Outcrops
Rough Broken Land Excessively Stony
Sand Pits Disturbed Ground, Excessively
Coarse Substrata
Sandy Land Excessively Coarse Substrata
Steep Stony Land Parker Material Slope, Excessively Stony
Sulphaquents Wetland
Sulphihemists Wetland
Swamp Wetland
Tidal Marsh Wetland
Urban Land Disturbed Ground


N.J. Admin. Code § D

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