U.S. Geological Survey National Water-Quality Assessment Program Stream water-quality analytes Major ions and trace elements­schedule 998 (20 constituents) Pesticides ­­schedule 2437 (229 compounds) Alkalinity 1H­1,2,4­Triazole Arsenic 2,3,3­Trichloro­2­propene­1­sulfonic acid (TCPSA) Boron 2,4­D Calcium 2­(1­Hydroxyethyl)­6­methylaniline Chloride 2­[(2­Ethyl­6­methylphenyl)amino]­1­propanol Fluoride 2­Amino­N­isopropylbenzamide Iron 2­Aminobenzimidazole Lithium 2­Chloro­2',6'­diethylacetanilide 2­Chloro­4,6­diamino­s­triazine {CAAT} Magnesium (Didealkylatrazine) pH 2­Chloro­4­isopropylamino­6­amino­s­triazine Potassium 2­Chloro­6­ethylamino­4­amino­s­triazine {CEAT} Total dissolved solids 2­Chloro­N­(2­ethyl­6­methylphenyl)acetamide Selenium 2­Hydroxy­4­isopropylamino­6­amino­s­triazine 2­Hydroxy­4­isopropylamino­6­ethylamino­s­triazin Silica e {OIET} Sodium 2­Hydroxy­6­ethylamino­4­amino­s­triazine Specific conductance 2­Isopropyl­6­methyl­4­pyrimidinol Strontium 3,4­Dichlorophenylurea Sulfate 3­Hydroxycarbofuran Turbidity 3­Phenoxybenzoic acid Vanadium 4­(Hydroxymethyl)pendimethalin 4­Chlorobenzylmethyl sulfoxide Suspended sediment 4­Hydroxy molinate 4­Hydroxychlorothalonil Nutrients­schedule 2430 (18 constituents) 4­Hydroxyhexazinone A Inorganic carbon, suspended Acephate Dissolved inorganic carbon Acetochlor ammonia + organic nitrogen (unfiltered­Kjeldahl) Acetochlor oxanilic acid ammonia + organic nitrogen (filtered­Kjeldahl) Acetochlor sulfonic acid Ammonia as N, filtered Acetochlor sulfynilacetic acid nitrite, filtered Alachlor Nitrite + nitrate, filtered Alachlor oxanilic acid Organic carbon, suspended Alachlor sulfonic acid Dissolved organic carbon Alachlor sulfynilacetic acid Phosphorus, filtered Aldicarb Total phosphorus, unfiltered Aldicarb sulfone Orthophosphate, filtered Aldicarb sulfoxide Total nitrogen (NH3+NO2+NO3+Organic), filtered Ametryn Total Particulate Carbon (TPC) Asulam Total Particulate Nitrogen (TPN) Atrazine Ultraviolet absorbing organic constituents ­ 254 nm Azinphos­methyl Ultraviolet absorbing organic constituents ­ 280nm Azinphos­methyl oxon Ultraviolet absorbing organic constituents ­ 412 nm Azoxystrobin Bentazone Bifenthrin Bromacil Bromoxynil Butralin Butylate

Pesticides ­­continued Fenamiphos sulfone Carbaryl Fenamiphos sulfoxide Carbendazim Fenbutatin oxide Carbofuran Fentin Carboxy molinate Fipronil Chlorimuron­ethyl Fipronil amide Chlorosulfonamide acid Fipronil sulfide Chlorpyrifos Fipronil sulfonate Chlorpyrifos oxon Fipronil sulfone Chlorsulfuron Flubendiamide cis­Bifenthrin acid/cis­Cyhalothrin Flumetsulam acid/cis­Tefluthrin acid cis­Permethrin Fluometuron Cyanazine Fonofos Dacthal monoacid Halosulfuron­methyl Dechlorofipronil Hexazinone Dechlorometolachlor Hexazinone Transformation Product C Deiodo flubendiamide Hexazinone Transformation Product D Deisopropyl prometryn Hexazinone Transformation Product E Demethyl fluometuron Hexazinone Transformation Product G Demethyl hexazinone B Hydroxy didemethyl fluometuron Demethyl norflurazon Hydroxy monodemethyl fluometuron Desamino metribuzin Hydroxyacetochlor Desamino­diketo metribuzin Hydroxyalachlor Desulfinylfipronil Hydroxydiazinon Desulfinylfipronil amide Hydroxyfluometuron Diazinon Hydroxymetolachlor Diazinon oxon Hydroxyphthalazinone Dicamba Hydroxysimazine Dichlorvos Hydroxytebuthurion Dicrotophos Imazamox Didemethyl hexazinone F Imazaquin Diflubenzuron Imazethapyr Diflufenzopyr Imidacloprid Diketonitrile­isoxaflutole Indoxacarb Dimethenamid Isoxaflutole Dimethenamid oxanilic acid Isoxaflutole acid metabolite RPA 203328 Dimethenamid SAA Kresoxim­methyl Dimethenamid sulfonic acid Lactofen Dimethoate Linuron Disulfoton Malaoxon Disulfoton oxon Malathion Disulfoton oxon sulfone MCPA Disulfoton oxon sulfoxide Metalaxyl Disulfoton sulfone Metconazole Disulfoton sulfoxide Methamidophos Diuron Methidathion EPTC Methomyl EPTC degradate R248722 Methomyl oxime Ethoprophos Methoxyfenozide Etoxazole Methyl paraoxon Famoxadone Methyl parathion Fenamiphos Metolachlor

Pesticides ­­continued Metolachlor hydroxy morpholinone sec­Acetochlor oxanilic acid Metolachlor oxanilic acid sec­Alachlor oxanilic acid Metolachlor sulfonic acid Siduron Metribuzin Simazine Metribuzin DK Sulfentrazone Molinate Sulfometuron­methyl Myclobutanil Sulfosulfuron N­(3,4­Dichlorophenyl)­N'­methylure a Sulfosulfuron ethyl sulfone Naled Tebuconazole Nicosulfuron Tebufenozide Norflurazon Tebupirimfos oxon Novaluron Tebupirimphos O­Ethyl­O­methyl­S­propylphosphorothioate Tebuthiuron O­Ethyl­S­methyl­S­propyl phosphorodithioate Tebuthiuron TP 104 O­Ethyl­S­propyl phosphorothioate Tebuthiuron TP el108 Omethoate (Dimethoate oxon) Tebuthiuron TP el109 Tebuthiuron Transformation Product Orthosulfamuron 106 Oryzalin Terbacil Oxamyl Terbufos Oxamyl oxime Terbufos oxon Oxyfluorfen Terbufos oxon sulfone Paraoxon Terbufos oxon sulfoxide Pendimethalin Terbufos sulfone Phorate Terbufos sulfoxide Phorate oxon Terbuthylazine Phorate oxon sulfone Tetraconazole Phorate oxon sulfoxide Thiobencarb Phorate sulfone trans­Permethrin Phorate sulfoxide Triallate Phosmet Tribufos Phthalazinone Triclopyr Piperonyl butoxide Trifloxystrobin Profenofos Prometon Prometryn Propanil Propargite Propazine Propiconazole Propoxur Propyzamide Prosulfuron Pymetrozine Pyraclostrobin Pyridaben Pyriproxyfen