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Ossf Dr Test Practice Questions And Answers 2025/2026

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Ossf Dr Test Practice Questions And Answers 2025/2026

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2025/2026

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OSSF DR TEST PRACTICE QUESTIONS AND ANSWERS 2025/2026

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OSSF DR TEST PRACTICE
QUESTIONS AND ANSWERS
2025/2026
_______yandy________ysoilytexturalyclassesyareyalwaysyunsuitableyforystandardyabsorptiveyOSSFy-
yCORRECTyANSWERSyclassyIAyandyIV

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yCORRECTyANSWERSysurfaceysoilyA,ysurfaceysoilyB,yandyparentymaterial

_____________yisyaytermydescribingytheyabilityyofywaterytoymigrateythroughyaysoilyprofileyunderyeit
hery_________yory__________yconditions.y-
yCORRECTyANSWERSyHydraulicyconductivity,ysaturated,yunsaturated

Interconnectedyporesyinytheysoilyprofileyallowy______yandy_______ytoyenterytheysoilyatyitsysurfaceya
ndymigrateydownwardy-yCORRECTyANSWERSyair,ywater

Listytheyfourycomponentsyofysoily-yCORRECTyANSWERSyair,ywater,yorganics,yinorganics

Aydrainfieldyisy50yfeetybyy90yfeetyandymustybeycoveredywithyanyaverageyofy15yinchesyofysandyloam.y
Howymanyycubicyyardsyofysandyyloamysoilymustybeypurchasedy(findytheyvolumeyofyayrectangularyob
ject)?y-yCORRECTyANSWERSy208.3ycubicyyards

Whatywouldybeytheyvolumeyofyay5-foot-
diameterypumpytankythatyisy5yfeetytallywithytheyinlety1yfootybelowytheyrim?y-
yCORRECTyANSWERSy587ygals

Whatywouldybeytheypercentyslopeyonyayloty250yfeetydeepythatydropsy20yfeetyinyelevationyoverytheyd
epthyofytheylot?y-yCORRECTyANSWERSy8%

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eetylongywithy18yinchesyofygravel?y1ycubicyyardy=y27ycubicyfeet.y-
yCORRECTyANSWERSy6.67ycubicyyards

Aysepticytankyisy6yfeetyinydiameteryandyisy8yfeetydeep.yHowymanyygallonsywillyityholdyifytheyoverflowy
lineyisylocatedyhalfywayyupyfromytheybottom?y-yCORRECTyANSWERSy846ygals

Calculateytheyworkingyliquidycapacityy(volume)yforythisysepticytank.ySEEyPAGEy2-39!!y-
yCORRECTyANSWERSy1077gals

Whatyisytheysurfaceyareay(areayinysquareyfeet)yofyanyevapotranspirationysystemy40yfeetywideyandy6
5yfeetylong?y-yCORRECTyANSWERSy2,600ysqft

Figureytheyacreageyforyaypieceyofypropertyythatymeasuresy256yfeetyonyeachyofyfourysides.y-
yCORRECTyANSWERSy1.5yacres

Figureytheyareayofyaylotythatymeasuresy60ftybyy280fty-yCORRECTyANSWERSy16,800sqfty,0.39yacres

Aydisposalyoptionythatymightybeyconsideredyinyayclayysoilywouldybeyay________.y-
yCORRECTyANSWERSydripyorysprayyirrigation

Theyprimaryytreatmentydeviceyprovidingytheyleastyorypoorestytreatmentyofydomesticywastewatery
wouldybey_______.y-yCORRECTyANSWERSysepticytank

Nitrogenyorynitrateyremovalyinysoilyoccursybyy_________.y-yCORRECTyANSWERSyvegetationyuptake

Theyfactorsyinfluencingytheysurvivalyofybacteriayinysoilyarey_______.y-
yCORRECTyANSWERSymoisture,ytemperature,ypH,yandyorganicymatter.

, Physicalyremovalyofybacteriaybyystrainingyoccursywheny_______.y-
yCORRECTyANSWERSytheybacteriayareylargerythanytheyporeyopeningsyinytheysoil

Aysolidythatycanybeyfilteredyoutyofytheywastewateryisyay_________.y-
yCORRECTyANSWERSysuspendedysolid

Whichyofytheyfollowingydescribesydomesticywastewateryasyityleavesyayhome?y-
yCORRECTyANSWERSyfresh,ylightyinycolor,yhasydissolvedyoxygen

Whichyofytheyfollowingyareyproblemsycausedybyymalfunctioningysepticytankysystems?y-
yCORRECTyANSWERSysurfaceywaterypollution,ygroundwaterycontamination,yandystandingysewageyi

nyneighborhoods

Anyinorganicychemicalythatyaffectsyhumanyhealthyisy-yCORRECTyANSWERSynitrate

Parasitesy(helminths)yfoundyinyuntreatedysewageyincludey________.y-
yCORRECTyANSWERSyhookworm,yroundyworms,yandytapeworms

Virusesyareyresponsibleyforysuchydiseasesyasy-
yCORRECTyANSWERSypoliomyelitisyandyinfectiousyhepatitis

Aytypeyofybacteriaythatyindicatesysewageycontaminationyisy________.y-
yCORRECTyANSWERSyfecalycoliform

Protozoayareyveryysimpleyanimalyorganismsythatymayycausey________.y-
yCORRECTyANSWERSyamoebaydysenteryyandyGiardiasis

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