US Geological Survey

This search form allows a user to view and download Health-Based Screening Level (HBSL) values for 436 unregulated contaminants (those without Maximum Contaminant Levels) analyzed by the National Water-Quality Assessment (NAWQA) Program. HBSLs are estimates of benchmark concentrations of contaminants in water that may be of potential concern for human-health. HBSLs are used in screening-level assessments to provide an initial perspective on the potential relevance of detected contaminants to human health and to help prioritize further investigations. HBSLs do not consider all potential human exposure pathways (only drinking water ingestion), nor do they address ecological concerns.

Learn more about what HBSLs are, how they are calculated, and guidance on their use.

HBSL Search Instructions

1. Define search criteria.

• Search by chemical class - Hold CTRL (Windows) or Option (Mac OS) key and click items to select multiple chemical classes.
• Search by chemical name - Hold CTRL (Windows) or Option (Mac OS) key and click items to select multiple chemical names.
• Search by Chemical Abstracts Service Registry Number (CASRN) - Type in without hyphens; use "*" as a wildcard.
• To select all chemicals, select "Do Not Search By Class" for Chemical Class, "Do Not Search by Name" for Chemical Name, and "All" for CASRN.

2. Select the type of data output.

• Short HBSL report - Includes HBSL values and select key information about how the HBSL values were calculated.
• Detailed HBSL report - Includes HBSL values and complete information about the toxicity information and the approach used to calculate each HBSL value.
• To export either report format to a comma-separated file, click the export and metadata links below the report. To save the metadata file, right-click the link and choose "Save As".

3. Submit the query by pressing the "Go" button.

Query Parameters

Chemical Class	Do Not Search By Class Emerging contaminantMajor ionNutrientPCBPesticidePesticide degradation productSVOCTrace elementVOC	Chemical Name	Do Not Search By Name 1,1,1,2-Tetrachloroethane1,1,2,2-Tetrachloroethane1,1,2-Trichloro-1,2,2-Trifluoroethane1,1-Dichloroethane1,1-Dichloropropene1,2,3,4-Tetramethylbenzene1,2,3,5-Tetramethylbenzene1,2,3-Trichlorobenzene1,2,3-Trichloropropane1,2,3-Trimethylbenzene1,2,4-Trimethylbenzene1,2-Diphenylhydrazine1,3,5-Trimethylbenzene1,3-Dichlorobenzene1,3-Dichloropropane1,3-Dichloropropene1,4-Naphthoquinone1-Chloro-2-methylbenzene1-Ethyl-2-Methylbenzene1-Methyl-4-isopropylbenzene1-Methylnaphthalene1-Naphthol17-beta-Estradiol2,2-Dichloropropane2,4,5-T2,4,6-Trichlorophenol2,4-D methyl ester2,4-DB2,4-Dichlorophenol2,4-Dimethylphenol2,4-Dinitrophenol2,4-Dinitrotoluene2,5-Dichloroaniline2,6-Diethylaniline2,6-Dimethylnaphthalene2,6-Dinitrotoluene2-(4-tert-butylphenoxy)-cyclohexanol2-Amino-N-isopropylbenzamide2-Chloro-2,6-diethylacetanilide2-Chloronaphthalene2-Chlorophenol2-Ethyl-6-methylaniline2-Hexanone2-Hydroxyatrazine2-Methylnaphthalene2-Nitrophenol2-[2-Ethyl-6-methylphenyl)amino]-1-propanol3,3'-Dichlorobenzidine3,4-Dichloroaniline3,5-Dichloroaniline3-(4-chlorophenyl)-1-methyl urea3-(Trifluoromethyl)-phenyl urea3-beta-Coprostanol3-Chloropropene3-Hydroxycarbofuran3-Keto-carbofuran3-Methyl-1(H)-indole3-Phenoxybenzyl alcohol3-tert-Butyl-4-hydroxy anisole3-Trifluoromethylaniline4,4'-Dichlorobenzophenone4,6-Dinitro-2-methylphenol4-(Hydroxymethyl)pendimethalin4-Bromophenylphenylether4-Chloro-2-methylphenol4-Chlorobenzylmethyl sulfone4-Chlorophenyl phenyl ether4-Chlorotoluene4-Cumylphenol4-Methyl-2-pentanone4-n-Octylphenol4-tert-Octylphenol5-Methyl-1H-benzotriazoleAcenaphtheneAcenaphthyleneAcetate, VinylAcetochlorAcetochlor ethane sulfonic acidAcetochlor oxanilic acidAcetoneAcetophenoneAcetyl hexamethyl tetrahydronaphthaleneAcifluorfenAcifluorfen, sodiumAcroleinAcrylonitrileAlachlor ethane sulfonic acidAlachlor oxanilic acidAldicarbAldicarb sulfoneAldicarb sulfoxideAldrinalpha-Endosulfanalpha-HCHAluminumAmetrynAminomethylphosphonic acidAnthraceneAnthraquinoneAROCLOR 1016AROCLOR 1221AROCLOR 1232AROCLOR 1242AROCLOR 1248AROCLOR 1254AROCLOR 1260Azinphos-methylAzinphos-methyl-oxonBarbanBendiocarbBenfluralinBenomylBensulfuron-methylBentazonBenzidineBenzophenoneBenzo[b]fluorantheneBenzo[ghi]peryleneBenzo[k]fluorantheneBenz[a]anthracenebeta-Endosulfanbeta-HCHbeta-Sitosterolbeta-StigmastanolBifenthrinbis(2-Chloroethoxy)methanebis(2-Chloroethyl)etherbis(2-chloroisopropyl) etherBisphenol ABoronBromacilBromideBromobenzeneBromochloromethaneBromoetheneBromomethaneBromoxynilButachlorButylateButylbenzyl phthalateCaffeineCalciumCamphorCaptanCarbarylCarbazoleCarbon DisulfideCarbon OrganicCarboxinChlorambenChloramben, methyl esterChlordane, technicalChlorideChlorimuron-ethylChloroethaneChloroethyl vinyl etherChlorothalonilChlorpyrifosChlorpyrifos, oxygen analogChlorsulfuronCholesterolChromium (III)Chromium (VI)Chrysenecis-1,3-Dichloropropenecis-Chlordanecis-Permethrincis-PropiconazoleClopyralidCobaltCotinineCyanazineCyanazine-amideCycloateCyfluthrinCyhalothrinCyhalothrin/KarateCypermethrind-LimoneneDacthalDacthal monoacidDeethylatrazineDeisopropyl-prometrynDeisopropylatrazinedelta-HCHDemethyl-fluometuronDemethyl-norflurazonDesethyl desisopropyl atrazineDesulfinylfipronilDesulfinylfipronil amideDi-n-butyl phthalateDi-n-octyl phthalateDiazinonDiazoxonDibenz[a,h]anthraceneDibromomethaneDicambaDichlobenilDichlorodifluoromethaneDichlorpropDichlorvosDicrotophosDieldrinDiethyl phthalateDiisopropyletherDimethenamidDimethenamid ethane sulfonic acidDimethenamid oxanilic acidDimethoateDimethomorphDimethyl phthalateDiphenamidDisulfotonDisulfoton sulfoneDisulfoton sulfoxideDiuronEndosulfanEndosulfan etherEndosulfan sulfateEndrin aldehydeEPTCEquileninEsfenvalerateEstroneEthalfluralinEther, EthylEthionEthion monoxon¿EthoprophosEthyl methacrylateEthyl tert-butyl etherEthynyl estradiolFenamiphosFenamiphos sulfoneFenamiphos sulfoxideFenthionFenthion sulfoxideFenuronFipronilFipronil metabolitesFipronil sulfideFipronil sulfoneFlufenacetFlufenacet ethane sulfonic acidFlufenacet oxanilic acidFlumetralinFlumetsulamFluometuronFluorantheneFluoreneFonofosFonofos, oxygen analogGlufosinateGlufosinate ammoniumHalosulfuron methylHexachlorobutadieneHexachloroethaneHexadydrohexamethylcyclopentabenzopyranHexazinoneHydroxideImazapyrImazaquinImazethapyrImidaclopridIndeno[1,2,3-cd]pyreneIndoleIodideIprodioneIronIsoborneolIsofenphosIsophoroneIsopropylbenzeneIsoquinolineLinuronLithiumm- and p-Xylenem-NitrotolueneMagnesiumMalaoxonMalathionManganeseMCPAMCPBMentholMetalaxylMethidathionMethiocarbMethomylMethomyl oximeMethyl acetateMethyl acrylateMethyl acrylonitrileMethyl Ethyl KetoneMethyl iodideMethyl methacrylateMethyl salicylateMethyl tert-butyl etherMethyl-3-(2,2-dichlorovinyl)-2,2-dimethyl-(1-cyclopropane)-carboxylate (cis- or trans-)MethylchlorideMetolachlorMetolachlor ethane sulfonic acidMetolachlor oxanilic acidMetribuzinMetsulfuron-methylMirexMolinateMolybdenumMyclobutanilN,N-diethyl-meta-toluamiden-ButylbenzeneN-Nitrosodi-N-propylamineN-NitrosodimethylamineN-Nitrosodiphenylaminen-PropylbenzeneNaledNaphthaleneNapropamideNeburonNickelNicosulfuronNitrobenzeneNitrogenNitrogen AmmoniaNitrogen Ammonia +OrganicNitrogen, OrganicNonylphenol, diethoxy-NorflurazonO-Ethyl-O-methyl-S-propylphosphorothioateo-XyleneOctylphenol, diethoxy-Octylphenol, monoethoxy-OryzalinOxamyl oximeOxyfluorfenp,p'-DDDp,p'-DDEp,p'-DDTp-Chloro-m-cresolp-Cresolp-Nitrophenolpara-NonylphenolParaoxon-ethylParaoxon-methylParathionParathion-methylPebulatePendimethalinPerchloratePermethrinPerthanePhenanthrenePhenolPhenolsPhoratePhorate oxonPhosmetPhosmet oxonPhosphorusPhosphorus OrthoPolychlorinated naphthalenesPotassiumPrimisulfuron methylProfenofosPrometonPrometrynPropachlorPropachlor ethane sulfonic acidPropachlor oxanilic acidPropanilPropargitePropazinePropetamphosProphamPropiconazolePropoxurPropyzamideProsulfuronPyrenesec-ButylbenzeneSiduronSilicaSilverSimetrynSodiumStrontiumSulfateSulfideSulfometuron-methylSulfoteppSulprofosTCPSA, ethyl esterTebupirimphosTebupirimphos, oxygen analogueTebuthiuronTefluthrinTefluthrin metabolite [R 119364]Tefluthrin metabolite [R152912]TemephosTerbacilTerbufosTerbufos-O-analogue sulfoneTerbufos-sulfoxideTerbuthylazineTerbutryntert-Amyl alcoholtert-butyl alcoholtert-Butylbenzenetert-Pentyl methyl etherTetrahydrofuranTetrahydrophthalimideThifensulfuron methylThiobencarbtrans-1,3-Dichloropropenetrans-1,4-Dichloro-2-butenetrans-Chlordanetrans-PropiconazoleTri(2-butoxyethyl)phosphateTri(2-chloroethyl)phosphateTriallateTriasulfuronTribenuron-methylTribuphosTributyl phosphateTrichlorofluoromethaneTriclopyrTriclosanTriethyl citrateTrifluralinTriflusulfuron methylTriphenyl phosphateTris(dichlorisopropyl)phosphateTrithionVanadiumVernolateZinc	CASRN	[All]
Report Type	Short Detailed

History of HBSL Revisions

HBSL Update Date

HBSL Values current as of April 10, 2008