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False Positive and Negative Charts
The Branch of Quality Systems (BQS) operates an Organic Blind Sample Project (OBSP). One of the goals of the project is to document bias and variability for the National Water Quality Laboratory (NWQL) through the use of blind quality assurance (QA) samples. From these summaries, districts can be informed of the NWQL's performance on QA samples that parallel their own environmental samples.

The False Positive and False Negative charts provide result concentration and expected concentration respectively for every analyte for every method OBSP assesses since 2005. The charts exhibit a Reporting Level line. All data is provisional and may change if the OBSP deems necessary.

Note: If there are 20% or more false positives or false negatives, there may be a discussion in theOBSP Summaries (Internal access only) that may add to the interpretation of the data seen in these charts.

A red analyte name is an indication of a permanently estimated compound .
NOTE: Charts are presented as graphical images. Use the back button on your browser to return to analyte choices.

The charts and data that you might secure from this U.S. Geological Survey (USGS) web page (identified as "OBSP") have not received official USGS approval and as such are provisional and subject to revision. The charts and data are released on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from its authorized or unauthorized use.


Click below for a scrollable list of analytes with false positives or negatives, sorted by NWQL parameter code

Lab Schedule 1319 - Organophosphorus Pesticides, Whole Water Recoverable
Click here for all analytes sorted by NWQL parameter code or choose an analyte below Parameter CAS#
Chlorpyrifos 38932GC089 2921-88-2
Diazinon 39570GC095 333-41-5
Malathion (E) 39530GC095 121-75-5
Parathion 39540GC095 56-38-2
Parathion-methyl 39600GC095 298-00-0
Phorate 39023GC089 298-02-2
Lab Schedule 1324 - Organochlorine Pesticides by GC, Whole Water Recoverable
Click here for all analytes sorted by NWQL parameter code or choose an analyte below Parameter CAS#
Aldrin 39330GCE12 309-00-2
Alpha-endosulfan (Endosulfan I) 39388GCE12 959-98-8
Chlordane, Technical mix 39350GCE12 57-74-9
Dieldrin 39380GCE12 60-57-1
Endrin 39390GCE12 72-20-8
Heptachlor Epoxide 39420GCE12 1024-57-3
Heptachlor 39410GCE12 76-44-8
Lindane 39340GCE12 58-89-9
Mirex 39755GCE12 2385-85-5
p,p'-DDD 39360GCE12 72-54-8
p,p'-DDE 39365GCE12 72-55-9
p,p'-DDT 39370GCE12 50-29-3
p,p'-Methoxychlor 39480GCE12 72-43-5
Toxaphene 39400GCE12 8001-35-2
Lab Schedule 1383 - Semivolatile Compounds (base/neutral/acid - BNA), Whole Water Recoverable
Click here for all analytes sorted by NWQL parameter code or choose an analyte below Parameter CAS#
1,2,4-Trichlorobenzene 34551GCM57 120-82-1
1,2-Dichlorobenzene34536GCM57 95-50-1
1,3-Dichlorobenzene 34566GCM57 541-73-1
1,4-Dichlorobenzene 34571GCM57 106-46-7
2,4,6-Trichlorophenol 34621GCM56 88-06-2
2,4-Dichlorophenol 34601GCM56 120-83-2
2,4-Dinitrophenol (E) 34616GCM56 51-28-5
2,4-Dinitrotoluene 34611GCM57 121-14-2
2,6-Dinitrotoluene 34626GCM57 606-20-2
2-Chloronaphthalene 34581GCM57 91-58-7
2-Chlorophenol 34586GCM56 95-57-8
2-Nitrophenol 34591GCM56 88-75-5
3,3'-Dichlorobenzindine (E) 34631GCM55 91-94-1
4,6-Dinitro-2-methylphenol (E) 34657GCM56 534-52-1
4-Bromophenylphenylether 34636GCM57 101-55-3
4-Chloro-3-methylphenol 34452GCM56 59-50-7
4-Chlorophenyl phenyl ether 34641GCM57 7005-72-3
4-Nitrophenol (E) 34646GCM56 100-02-7
Acenaphthene 34205GCM57 83-32-9
Acenaphthylene 34200GCM57 208-96-8
Anthracene 34220GCM57 120-12-7
Benz[a]anthracene 34526GCM57 56-55-3
Benzo[b]fluoranthene 34230GCM57 205-99-2
Bis(2-Ethylhexyl) phthalate 39100GCM57 117-81-7
Butylbenzyl phthalate 34292GCM57 85-68-7
Chrysene 34320GCM57 218-01-9
Diethyl phthalate 34336GCM57 84-66-2
Dimethyl phthalate 34341GCM57 131-11-3
Di-n-octyl phthalate 34596GCM57 117-84-0
Fluoranthene 34376GCM57 206-44-0
Fluorene 34381GCM57 86-73-7
Hexachlorobenzene 39700GCM57 118-74-1
Hexachlorobutadiene (E) 39702GCM57 87-68-3
Hexachlorocyclopentadiene (E) 34386GCM57 77-47-4
Indeno[1,2,3-cd]pyrene 34403GCM57 193-39-5
Naphthalene 34696GCM57 91-20-3
N-Nitrosodiphenylamine 34433GCM57 86-30-6
Pentachlorophenol (E) 39032GCM56 87-86-5
Phenanthrene 34461GCM57 85-01-8
Phenol 34694GCM56 108-95-2
Pyrene 34469GCM57 129-00-0
Lab Schedule 1433 - Waste Water Compounds by GCMS, Filtered
Click here for all analytes sorted by NWQL parameter code or choose an analyte below Parameter CAS#
1,4-Dichlorobenzene (E) 34572GCM37 106-46-7
2-Methylnaphthalene 62056GCM37 91-57-6
3-beta-Coprostanol (E) 62057GCM37 360-68-9
3-Methyl-1(H)-indole (Skatole) 62058GCM37 83-34-1
4-Cumylphenol 62060GCM37 599-64-4
4-n-Octylphenol 62061GCM37 1806-26-4
4-tert-Octylphenol 62063GCM37 136-85-6
5-Methyl-1H-benzotriazole 62062GCM37 140-66-9
Acetophenone 62064GCM37 98-86-2
Acetyl hexamethyl tetrahydronaphthalene (AHTN) - Data reload in NWIS for two fragrance compounds (HHCB and ATHN) in Schedules 1433, 4433, and 5433 (WSC Action Required); see Technical memorandum 2007.03 or Rapi Note 07-014 62065GCM37 21145-77-7
Anthraquinone 62066GCM37 84-65-1
beta-Stigmastanol (E) 62086GCM37 19466-47-8
Bisphenol A (E) 62069GCM37 80-05-7
Bromoform (E) 34288GCM37 75-25-2
Caffeine 50305GCM37 58-08-2
Camphor 62070GCM37 76-22-2
Carbaryl (E) 82680GCM37 63-25-2
Carbazole 62071GCM37 86-74-8
Chlorpyrifos 38933GCM37 2921-88-2
Cholesterol (E) 62072GCM37 57-88-5
Diazinon 39572GCM37 333-41-5
Dichlorovos (Dichlorvos) (E) - Removed from method as of November 1, 2005; see Technical Memorandum 2006.01 for official documentation. 38775B 62-73-7
d-Limonene (E) 62073GCM37 5989-27-5
Hexadydrohexamethylcyclopentabenzopyran (HHCB) - Data reload in NWIS for two fragrance compounds (HHCB and ATHN) in Schedules 1433, 4433, and 5433 (WSC Action Required); see Technical memorandum 2007.03 or Rapi Note 07-014 62075GCM37 1222-05-5
Indole 62076GCM37 120-72-9
Isoborneol 62077GCM37 124-76-5
Isophorone 34409GCM37 78-59-1
Isopropylbenzene (Cumene) (E) 62078GCM37 98-82-8
Isoquinoline 62079GCM37 119-65-3
Menthol 62080GCM37 89-78-1
Methyl salicylate 62081GCM37 119-36-8
Metolachlor 39415GCM37 51218-45-2
Naphthalene 34443GCM37 91-20-3
Nonylphenol, diethoxy- (total) (E) 62083GCM37 26027-38-2
Octylphenol, diethoxy- (E) 61705GCM37 26636-32-8
Octylphenol, monoethoxy- (E) 61706GCM37 26636-32-8
para-Nonylphenol (total) (E) 62085GCM37 84852-15-3
p-Cresol 62084GCM37 106-44-5
Pentachlorophenol (E) 34459GCM37 87-86-5
Phenanthrene 34462GCM37 85-01-8
Phenol 34466GCM37 108-95-2
Tetrachloroethylene (E) 34476GCM37 127-18-4
Triclosan 62090GCM37 3380-34-5
Triethyl citrate (ethyl citrate) 62091GCM37 77-93-0
Lab Schedule 2001 - Pesticides determinations by SPE and GCMS, Filtered
Click here for all analytes sorted by NWQL parameter code or choose an analyte below Parameter CAS#
2,6-Diethylaniline 82660GCM35 579-66-8
Carbaryl (E) 82680GCM35 63-25-2
Desulfinylfipronil 62170GCM31 not assigned
Disulfoton (E) 82677GCM35 298-04-4
Ethoprophos 82672GCM35 13194-48-4
Fipronil (E) 62166GCM31 120068-37-3
Fipronil Sulfide 62167GCM31 120067-83-6
Fipronil Sulfone 62168GCM31 120068-36-2
Lindane 39341GCM35 58-89-9
Malathion 39532GCM35 121-75-5
Metribuzin 82630GCM35 21087-64-9
Pebulate 82669GCM35 1114-71-2
Phorate 82664GCM35 298-02-2
Simazine 04035GCM35 122-34-9
Terbufos 82675GCM35 13071-79-9
Thiobencarb 82681GCM35 28249-77-6
Lab Schedule 2021 - NAWQA 85 Volatile Organic Compounds by GCMS, Whole Water Recoverable
Click here for all analytes sorted by NWQL parameter code or choose an analyte below Parameter CAS#
1,4-Dichlorobenzene 34571GCM66 106-46-7
Acetone 81552GCM66 67-64-1
Benzene 34030GCM66 71-43-2
Chloromethane (E) 34418GCM66 74-87-3
cis-1,2-Dichloroethylene 77093GCM66 156-59-2
cis-1,3-Dichloropropene 34704GCM66 10061-01-5
Dichloromethane 34423GCM66 75-09-2
Methyl iodide (E) 77424GCM66 74-88-4
Styrene 77128GCM66 100-42-5
Tetrachloroethylene 34475GCM66 127-18-4
Toluene 34010GCM66 108-88-3
trans-1,2-Dichloroethylene 34546GCM66 156-60-5
Trichloroethylene 39180GCM66 79-01-6
Lab Schedule 2033 - NAWQA ACT/ULUG Selected, Filtered Pesticides and Degradates (LS2003 plus 20 compounds)
Click here for all analytes sorted by NWQL parameter code or choose an analyte below Parameter CAS#
1-Naphthol (E) 49295GCM39 90-15-3
Atrazine 39632GCM35 1912-24-9
Chlorpyrifos, oxygen analog (E) 61636GCM35 5598-15-2
Desulfinylfipronil 62170GCM29 not assigned
Diazinon, oxygen analog 61638GCM14 962-58-3
Dichlorovos (Dichlorvos) (E) 38775GCM39 62-73-7
Disulfoton sulfone 61640GCM39 2497-06-5
EPTC 82668GCM35 759-94-4
Fenamiphos sulfoxide (E) 61646GCM39 31972-43-7
Fipronil 62166GCM29 120068-37-3
Fipronil sulfide 62167GCM29 120067-83-6
Fipronil sulfone 62168GCM29 120068-36-2
Fonofos 04095GCM35 944-22-9
Malaoxon 61652GCM39 1634-78-2
Malathion39532GCM35 121-75-5
Molinate 82671GCM35 2212-67-1
Phosmet (Imidan) (E) 61601GCM39 732-11-6
Phosmet oxon (E) 61668GCM39 3735-33-9
Simazine 04035GCM35 122-34-9
Tebuconazole 62852GCM14 107534-96-3
Lab Schedule 2060 - Polar Pesticides and Metabolites by SPE and HPLC/MS, Filtered
Click here for all analytes sorted by NWQL parameter code or choose an analyte below Parameter CAS#
2,4- 39732LCM29 94-75-7
2,4-D methyl 50470LCM29 1928-38-7
2-Hydroxy-4-isopropylamino-6-ethylamino-s-triazine {OIET} {2-Hydroxyatrazine} (E) 50355LCM29 2163-68-0
3(4-chlorophenyl)-1-methyl urea 61692LCM29 5352-88-5
3-Ketocarbofuran - Removed from method as of January 1, 2006; see Technical Memorandum 2007.02 for official documentation. 50295LCM29 16709-30-1
Aldicarb (E) 49312LCM29 116-06-3
Aldicarb sulfone (E) 49313LCM29 1646-88-4
Aldicarb sulfoxide (E) 49314LCM29 1646-87-3
Bendiocarb 50299LCM29 22781-23-3
Bromoxynil (E) 49311LCM29 1689-84-5
Carbaryl 49310LCM29 63-25-2
Chloramben, methyl ester (E) 61188LCM29 7286-84-2
Chlorimuron ethyl (E) 50306LCM29 90982-32-4
Chlorothalonil (E) - Removed from method as of January 1, 2006; see Technical Memorandum 2007.02 for official documentation. 49306LCM29 1897-45-6
Clopyralid 49305LCM29 1702-17-6
Cycloate (E) 04031LCM29 1134-23-2
Dacthal monoacid 49304LCM29 887-54-7
Chlorodiamino-s-triazine {CAAT} {Deethyldeisopropylatrazine} (E)(Removed from method July 01, 2007, see Technical Memorandum 2007.02) . 04039LCM29 3397-62-4
2-Chloro-6-ethylamino-4-amino-s-triazine {CEAT} {Deisopropylatrazine} (E) 04038LCM29 1007-28-9
Dicamba 38442LCM29 1918-00-9
Dichloroprop (Dichlorprop) 49302LCM29 120-36-5
Dinoseb 49301LCM29 88-85-7
Fenuron 49297LCM29 101-42-8
Flumetsulam (E) 61694LCM29 98967-40-9
Imidacloprid 61695LCM29 138261-41-3
MCPB 38487LCM29 94-81-5
Metalaxyl 50359LCM29 57837-19-1
Methiocarb (E) 38501LCM29 2032-65-7
Methomyl 49296LCM29 16752-77-5
Metsulfuron methyl (E) 61697LCM29 74223-64-6
Nicosulfuron (Accent) (E) 50364LCM29 111991-09-4
Norflurazon 49293LCM29 27314-13-2
Oxamyl 38866LCM29 23135-22-0
Propham 49236LCM29 122-42-9
Propiconazole (Tilt) 50471LCM29 60207-90-1
Propoxur (E) 38538LCM29 114-26-1
Sulfometuron methyl 50337LCM29 74222-97-2
Tebuthiuron 82670LCM29 34014-18-1
Terbacil (E) 04032LCM29 5902-51-2
Lab Schedule 2080 - Pharmaceuticals by HPLC-MS, Water, Filtered - custom, unapproved method
Click here for all analytes sorted by NWQL parameter code or choose an analyte below Parameter CAS#
Fluoxetine-HCl 6201100021 59333-67-4
Ranitidine-HCl 6201100021 59333-67-4
Lab Schedule 4024 - Gasoline Oxygenates, Un-acidified, Wat, Unfiltered
Choose the link below Parameter CAS#
Acetone 81552GCM60 67-64-1
Lab Schedule 2503 - NAWQA Carbon Forms - Total, Inorganic, Organic from Bed Material
Choose the link below Parameter CAS#
Organic Sediment Carbon 4927100057 not assigned

Lab Code 2322 - Phenol, Total Recoverable

Choose the link below Parameter CAS#
Phenol 32730 00088 not assigned

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