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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Bethpage WD

Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Read More.

In addition to tap water disinfection, chloroform pollution in the environment also comes from industrial discharges from pulp and paper mills, and from urban wastewater effluent. Human studies show that chloroform damages the kidneys, liver and central nervous system. In animals, chloroform causes infertility, birth defects and cancer.

Click here to read more about disinfection byproducts.

 

934

Samples

0

Samples exceeding legal limit (MCL)

288

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.386 ppb15743ND - 3.60 ppb
20150.404 ppb16144ND - 3.22 ppb
20160.470 ppb16148ND - 3.66 ppb
20170.492 ppb16750ND - 3.90 ppb
20180.554 ppb14344ND - 3.20 ppb
20190.572 ppb14559ND - 3.30 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-061401064-001-POCSND
2014-01-061401064-003-POCSND
2014-01-061401064-002-POCSND
2014-01-071401169-002-POCS0.600 ppb
2014-01-071401169-001-POCSND
2014-01-071401169-003-POCSND
2014-01-101401379-002-POCSND
2014-01-101401382-002-POCSND
2014-01-101401379-001-POCSND
2014-01-101401382-001-POCS1.10 ppb
2014-02-041402054-002-POCSND
2014-02-041402054-001-POCSND
2014-02-041402054-003-POCSND
2014-02-061402226-001-POCS0.900 ppb
2014-02-061402226-003-POCSND
2014-02-06140226-002-POCS2.80 ppb
2014-02-101402403-001-POCSND
2014-02-101402406-003-POCSND
2014-02-101402403-002-POCS0.900 ppb
2014-02-181402811-001-POCSND
2014-02-181402608-001-POCSND
2014-02-181402809-001-POCSND
2014-02-181402805-001-POCS1.20 ppb
2014-03-031403028-002-POCSND
2014-03-031403028-003-POCSND
2014-03-031403028-001-POCSND
2014-03-071403446-003-POCSND
2014-03-071403446-002-POCS3.10 ppb
2014-03-071403446-001-POCS0.840 ppb
2014-03-131403873-001-POCSND
2014-03-131403873-002-POCS0.950 ppb
2014-03-131403873-003-POCSND
2014-03-171403B04-001-POCS1.30 ppb
2014-03-171403B04-004-POCSND
2014-03-171403B04-002-POCSND
2014-03-171403B04-003-POCSND
2014-04-011404009-001-POCSND
2014-04-011404009-002-POCSND
2014-04-011404009-003-POCSND
2014-04-031404242-003-POCSND
2014-04-031404242-001-POCS1.20 ppb
2014-04-031404242-002-POCSND
2014-04-031404242-004-POCSND
2014-04-091404699-003-POCSND
2014-04-091404699-002-POCS3.40 ppb
2014-04-091404699-001-POCS1.20 ppb
2014-04-141404A25-003-POCSND
2014-04-141404A25-002-POCSND
2014-04-141404A25-001-POCSND
2014-04-301404M04-001-POCS0.930 ppb
2014-04-301404N04-003-POCSND
2014-04-301404M04-002-POCSND
2014-05-011405009-003-POCSND
2014-05-011405009-002-POCSND
2014-05-011405009-001-POCSND
2014-05-051405196-003-POCSND
2014-05-051405196-001-POCS0.820 ppb
2014-05-051405196-002-POCS2.60 ppb
2014-05-081405554-002-POCS0.980 ppb
2014-05-081405554-001-POCSND
2014-05-081405554--003-POCND
2014-05-131405966-001-POCSND
2014-05-131405965-001-POCS1.20 ppb
2014-05-131405965-002ND
2014-05-131405966-002-POCSND
2014-06-021406028-003-POCSND
2014-06-021406028-001-POCS0.860 ppb
2014-06-021406028-002-POCS2.40 ppb
2014-06-031046154-002-POCSND
2014-06-031406154-002-POCS1.20 ppb
2014-06-031406154-003-POCSND
2014-06-031406154-001-POCSND
2014-06-041406248-001-POCSND
2014-06-041406248-003-POCSND
2014-06-041406248-002-POCSND
2014-06-091406560-001-POCSND
2014-06-091406556-001-POCS0.840 ppb
2014-06-091406560-002-POCSND
2014-06-091406556-002-POCSND
2014-07-011407005-002-POCS2.90 ppb
2014-07-011407012-003-POCSND
2014-07-011407012-001-POCSND
2014-07-011407005-003-POCSND
2014-07-011407012-002-POCSND
2014-07-01147005-001-POCS1.10 ppb
2014-07-031407230-001-POCSND
2014-07-031407230-002-POCSND
2014-07-031407219-001-POCS1.10 ppb
2014-07-031407219-002-POCSND
2014-07-031407226-003-POCSND
2014-07-031407226-002-POCS0.990 ppb
2014-07-031407226-001-POCSND
2014-08-051408207-001-POCSND
2014-08-051408207-003-POCSND
2014-08-051408207-002-POCSND
2014-08-061408299-003-POCSND
2014-08-061408299-001-POCS0.980 ppb
2014-08-061408299-002-POCS2.40 ppb
2014-08-071408410-003-POCSND
2014-08-071408410-002-POCS0.950 ppb
2014-08-071408410-001-POCSND
2014-08-111408684-002-POCSND
2014-08-111408682-002-POCSND
2014-08-111408682-001-POCS0.910 ppb
2014-08-111408684-001-POCSND
2014-09-021409035-002-POCSND
2014-09-021409035-001-POCSND
2014-09-021409035-003-POCSND
2014-09-031409183-001-POCS0.980 ppb
2014-09-031409183-002-POCS2.80 ppb
2014-09-031409183-003-POCSND
2014-09-041409243-003-POCSND
2014-09-041409243-002-POCS1.000 ppb
2014-09-041409243-001-POCSND
2014-09-051409357-001-POCSND
2014-09-051409357-002-POCSND
2014-09-051409360-002-POCSND
2014-09-051409360-001-POCS0.880 ppb
2014-10-011410069-001-POCS0.860 ppb
2014-10-011410067-001-POCSND
2014-10-011410067-003-POCSND
2014-10-011410067-002-POCSND
2014-10-011410069-002-POCS2.10 ppb
2014-10-011410069-003-POCSND
2014-10-061410308-003-POCSND
2014-10-061410308-002-POCS0.940 ppb
2014-10-061410308-001-POCSND
2014-10-081410587-001-POCS0.820 ppb
2014-10-081410584-002-POCSND
2014-10-081410587-002-POCSND
2014-10-081410584-001-POCSND
2014-11-031411023-001-POCSND
2014-11-031411032-002-POCSND
2014-11-031411023-003-POCSND
2014-11-031411032-003-POCSND
2014-11-031411032-001-POCSND
2014-11-031411023-002-POCS1.90 ppb
2014-11-041411165-002-POCSND
2014-11-041411165-003-POCSND
2014-11-041411165-001-POCSND
2014-11-051411230-001-POCSND
2014-11-051411230-002-POCSND
2014-11-131411907-002-POCSND
2014-11-131411907-001-POCSND
2014-12-011412018-002-POCSND
2014-12-011412018-001-POCSND
2014-12-011412016-003-POCSND
2014-12-011412018-003-POCSND
2014-12-011412016-002-POCS3.60 ppb
2014-12-011412016-001-POCS0.940 ppb
2014-12-021412144-003-POCSND
2014-12-021412144-002-POCS0.560 ppb
2014-12-021412144-001-POCSND
2014-12-031412223-001-POCS0.630 ppb
2014-12-031412225-001-POCSND
2014-12-031412225-002-POCSND
2014-12-031412223-002-POCSND
2015-01-021501009-002-POCS0.830 ppb
2015-01-021501004-02-POCS2.50 ppb
2015-01-021501009-003-POCSND
2015-01-021501004-003-POCSND
2015-01-021501009-001-POCSND
2015-01-051501004-001-POCS0.710 ppb
2015-01-121501572-002-POCSND
2015-01-121501570-002-POCSND
2015-01-121501570-001-POCS1.000 ppb
2015-01-121501572-001-POCSND
2015-01-261501F10-001-POCSND
2015-01-261501F10-002-POCSND
2015-01-261501F10-003-POCSND
2015-02-021502016-001-POCS0.750 ppb
2015-02-021502041-001-POCSND
2015-02-021502016-002-POCS2.30 ppb
2015-02-021502041-002-POCSND
2015-02-021502016-003-POCSND
2015-02-021502041-003-POCSND
2015-02-091502455-001-POCS0.990 ppb
2015-02-091502455-002-POCSND
2015-02-091502453-001-POCSND
2015-02-091502453-002-POCSND
2015-02-101502576-002-POCS0.960 ppb
2015-02-101502576-001-POCSND
2015-02-101502576-003-POCSND
2015-03-021503016-003-POCSND
2015-03-021503016-002-POCS2.60 ppb
2015-03-021503018-001-POCSND
2015-03-021503018-002-POCSND
2015-03-021503018-003-POCSND
2015-03-021503016-001-POCS0.830 ppb
2015-03-041503223-002-POCSND
2015-03-041503223-001-POCS1.10 ppb
2015-03-041503217-002-POCSND
2015-03-041503217-001-POCSND
2015-03-091503514-003-POCSND
2015-03-091503514-001-POCSND
2015-03-091503514-002-POCS0.890 ppb
2015-03-231503F54-001 POCSND
2015-04-021504182-003-POCSND
2015-04-021504182-001-POCS0.940 ppb
2015-04-021504182-002-POCS3.10 ppb
2015-04-061504322-002-POCSND
2015-04-061504322-003-POCSND
2015-04-061504322-001-POCSND
2015-04-081504519-002-POCSND
2015-04-081504516-001-POCS1.50 ppb
2015-04-081504516-002-POCSND
2015-04-081504519-001-POCSND
2015-04-091504631-001ND
2015-04-161504B93-002-POCS0.580 ppb
2015-04-161504B93-001-POCSND
2015-04-161504B93-003-POCSND
2015-05-041505127-001-POCS0.900 ppb
2015-05-041505126-001-POCSND
2015-05-041505127-03-POCSND
2015-05-041505127-002-POCS2.62 ppb
2015-05-051505273-002-POCS0.870 ppb
2015-05-051505273-003-POCSND
2015-05-051505228-002-POCSND
2015-05-051505226-001-POCSND
2015-05-051505226-003-POCSND
2015-05-051505226-002-POCSND
2015-05-051505273-001-POCSND
2015-05-111505703-002-POCSND
2015-05-111505703-001-POCS1.24 ppb
2015-05-111505701-001ND
2015-05-111505701-002ND
2015-06-011506001-002-POCSND
2015-06-011506001-001-POCSND
2015-06-011506021-002-POCS3.00 ppb
2015-06-011506021-003-POCSND
2015-06-011506003-001-POCSND
2015-06-011506001-003-POCSND
2015-06-011506021-001-POCS0.970 ppb
2015-06-031506226-001-POCS1.37 ppb
2015-06-031506228-002-POCSND
2015-06-031506228-001-POCSND
2015-06-031506226-002-POCSND
2015-06-051506511-002-POCS1.01 ppb
2015-06-051506511-003-POCSND
2015-06-051506511-001-POCSND
2015-07-011507028-004 POCSND
2015-07-011507028-003ND
2015-07-011507028-002ND
2015-07-011507028-001ND
2015-07-021507155-002 POCSND
2015-07-021507122-002ND
2015-07-021507131-003ND
2015-07-021507126-002 POCSND
2015-07-021507131-001 POCS1.01 ppb
2015-07-021507152-001ND
2015-07-021507131-002 POCS3.09 ppb
2015-07-021507155-001 POCSND
2015-07-021507126-001 POCSND
2015-07-021507122-001 POCS1.22 ppb
2015-08-031508112-002ND
2015-08-031508021-001 POCSND
2015-08-031508112-003 POCSND
2015-08-031508016-001 POCSND
2015-08-031508016-002 POCSND
2015-08-031508112-001 POCSND
2015-08-041508136-002 BAC2.84 ppb
2015-08-041508132-001 POCSND
2015-08-041508132-003ND
2015-08-0415089132-002 POC1.07 ppb
2015-08-041508136-003 POCSND
2015-08-041508136-001 POCS0.960 ppb
2015-08-051508292-002 POCSND
2015-08-051508292-001 POCS1.19 ppb
2015-09-011509069-002 POCS2.82 ppb
2015-09-011509069-003ND
2015-09-011509048-001 POCSND
2015-09-011509069-001 POCS1.02 ppb
2015-09-011509044-003ND
2015-09-011509044-001 POCSND
2015-09-011509044-002 POCSND
2015-09-021509127-001 POCS1.19 ppb
2015-09-021509130-003 POCSND
2015-09-021509130-002 POCS1.12 ppb
2015-09-021509130-001 POCSND
2015-09-021509127-002ND
2015-09-241509I95-002ND
2015-10-011510012-003ND
2015-10-011510012-0023.22 ppb
2015-10-011510012-0011.13 ppb
2015-10-021510102-003ND
2015-10-021510102-002ND
2015-10-021510102-001ND
2015-10-021510135-001ND
2015-10-051510204-0021.31 ppb
2015-10-051510204-003ND
2015-10-051510275-0011.63 ppb
2015-10-051510275-002ND
2015-10-051510204-001ND
2015-10-091510761-002ND
2015-10-091510761-001ND
2015-11-021511011-0022.55 ppb
2015-11-021511015-003ND
2015-11-021511015-002ND
2015-11-021511019-003ND
2015-11-021511011-003ND
2015-11-021511019-001ND
2015-11-021511019-0020.860 ppb
2015-11-021511015-001ND
2015-11-021511011-0010.900 ppb
2015-11-041511236-001ND
2015-11-041511239-002ND
2015-11-041511232-001ND
2015-11-041511232-002ND
2015-11-041511239-0011.33 ppb
2015-12-011512122-003ND
2015-12-011512117-001ND
2015-12-011512117-002ND
2015-12-011512122-002ND
2015-12-011512122-001ND
2015-12-011512124-001ND
2015-12-031512274-0020.980 ppb
2015-12-031512274-001ND
2015-12-031512274-003ND
2016-01-041601028-001ND
2016-01-041601027-003ND
2016-01-041601027-001ND
2016-01-041601026-003ND
2016-01-041601027-002ND
2016-01-041601026-0010.970 ppb
2016-01-041601026-0022.62 ppb
2016-01-051601118-0011.55 ppb
2016-01-051601117-001ND
2016-01-051601117-003ND
2016-01-051601121-001ND
2016-01-051601118-002ND
2016-01-0516011174-0020.990 ppb
2016-02-011602028-001ND
2016-02-011602026-001ND
2016-02-011602030-0011.17 ppb
2016-02-011602026-002ND
2016-02-011602030-0023.40 ppb
2016-02-011602026-003ND
2016-02-011602030-003ND
2016-02-021602118-001ND
2016-02-021602114-003ND
2016-02-021602114-001ND
2016-02-021602114-0020.870 ppb
2016-02-021602116-002ND
2016-02-021602116-0011.47 ppb
2016-03-011603017-003ND
2016-03-011603058-0011.01 ppb
2016-03-011603017-001ND
2016-03-011603058-0023.03 ppb
2016-03-011603017-002ND
2016-03-011603030-001ND
2016-03-011603058-003ND
2016-03-021603131-001ND
2016-03-021603133-0011.37 ppb
2016-03-021603133-002ND
2016-03-021603136-003ND
2016-03-021603136-001ND
2016-03-021603136-0020.850 ppb
2016-04-041604178-0022.89 ppb
2016-04-041604178-0011.000 ppb
2016-04-041604176-001ND
2016-04-041604182-001ND
2016-04-041604182-002ND
2016-04-041604182-003ND
2016-04-041604178-003ND
2016-04-051604307-0012.24 ppb
2016-04-051604309-001ND
2016-04-051604307-002ND
2016-04-081604814-003ND
2016-04-081604814-001ND
2016-04-081604814-0021.06 ppb
2016-04-191604H82-001 POCSND
2016-04-191604H67-002ND
2016-04-191604H67-001ND
2016-05-021605031-0010.990 ppb
2016-05-021605031-003ND
2016-05-021605026-001ND
2016-05-021605031-0022.73 ppb
2016-05-021605026-002ND
2016-05-021605025-001ND
2016-05-021605026-003ND
2016-05-031605136-0011.95 ppb
2016-05-031605134-0021.19 ppb
2016-05-031605134-003ND
2016-05-031605136-002ND
2016-05-031605134-001ND
2016-05-131605C19-001ND
2016-05-131605C19-002ND
2016-06-011606058-0021.62 ppb
2016-06-011606058-003ND
2016-06-011606046-001ND
2016-06-011606043-001ND
2016-06-011606046-002ND
2016-06-011606058-0010.630 ppb
2016-06-011606046-003ND
2016-06-021606179-001ND
2016-06-021606174-0011.43 ppb
2016-06-021606179-002ND
2016-06-021606174-002ND
2016-06-021606176-003ND
2016-06-021606176-0020.890 ppb
2016-07-011607038-0010.850 ppb
2016-07-011607038-003ND
2016-07-011607033-001ND
2016-07-011607038-0023.66 ppb
2016-07-011607033-002ND
2016-07-011607033-003ND
2016-07-011607041-001ND
2016-07-061607309-001ND
2016-07-061607306-0011.57 ppb
2016-07-061607304-002ND
2016-07-061607304-001ND
2016-07-201607G21-001ND
2016-07-201607G21-003ND
2016-07-201607G21-0020.750 ppb
2016-08-011608030-0010.900 ppb
2016-08-011608023-002ND
2016-08-011608030-0022.76 ppb
2016-08-011608030-003ND
2016-08-011608029-001ND
2016-08-011608023-003ND
2016-08-011608023-001ND
2016-08-021608150-002ND
2016-08-021608153-0011.51 ppb
2016-08-021608146-0021.28 ppb
2016-08-021608153-002ND
2016-08-021608150-001ND
2016-08-021608146-003ND
2016-09-011609009-0021.17 ppb
2016-09-011609007-0023.06 ppb
2016-09-011609007-0011.17 ppb
2016-09-011609009-001ND
2016-09-011609009-003ND
2016-09-011609011-001ND
2016-09-011609007-003ND
2016-09-021609102-0011.66 ppb
2016-09-021609103-001ND
2016-09-061609226-002ND
2016-09-061609226-001ND
2016-09-141609A32-003ND
2016-09-141609A32-002ND
2016-09-141609A32-001ND
2016-10-03401016002ND
2016-10-037010040010.940 ppb
2016-10-03701016003ND
2016-10-037010040022.60 ppb
2016-10-03701016001ND
2016-10-04701085002ND
2016-10-04701090001ND
2016-10-04701090002ND
2016-10-047010860021.10 ppb
2016-10-047010850011.50 ppb
2016-10-04701086001ND
2016-11-01703329003ND
2016-11-017033290022.60 ppb
2016-11-017033290010.930 ppb
2016-11-01703342001ND
2016-11-01703342003ND
2016-11-01703342002ND
2016-11-01703340001ND
2016-11-02703439002ND
2016-11-027034430020.900 ppb
2016-11-02703441002ND
2016-11-02703439001ND
2016-11-02703443001ND
2016-11-027034410011.50 ppb
2016-11-02703443003ND
2016-12-017057570010.770 ppb
2016-12-017057570022.40 ppb
2016-12-01705755001ND
2016-12-01705759001ND
2016-12-01705755003ND
2016-12-01705755002ND
2016-12-01705757003ND
2016-12-027058640020.850 ppb
2016-12-02705864003ND
2016-12-02705856001ND
2016-12-02705864001ND
2016-12-027058600011.30 ppb
2016-12-02705860002ND
2017-01-037081190022.80 ppb
2017-01-03708122001ND
2017-01-037081190010.930 ppb
2017-01-03708119003ND
2017-01-03708121001ND
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2017-03-017012330005ND
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2017-04-0370147020033.00 ppb
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2017-04-117015498001ND
2017-04-117015494001ND
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2017-05-0170173300052.50 ppb
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2017-05-0170173300040.830 ppb
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2017-06-0170200870020.940 ppb
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2017-08-027025936002ND
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2017-08-0270259360040.870 ppb
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2017-10-027031523001ND
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2017-10-037031776001ND
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2017-11-017034471003ND
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2017-12-047037022003ND
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2017-12-217038849001ND
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2018-12-047072758001ND
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2018-12-047072767002ND
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2019-02-047078242004ND
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2019-02-057078379002ND
2019-02-0570783790011.90 ppb
2019-03-047081153003ND
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2019-03-047081153002ND
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2019-03-047081153001ND
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2019-04-0270841240011.90 ppb
2019-04-027084124003ND
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2019-05-017087752002ND
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2019-05-017087749001ND
2019-05-0170877540010.760 ppb
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2019-05-017087754003ND
2019-05-0270879000010.510 ppb
2019-05-027087901002ND
2019-05-0270879010012.00 ppb
2019-06-0370917470052.30 ppb
2019-06-037091747006ND
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2019-06-0370917470040.860 ppb
2019-06-037091747002ND
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2019-06-047091922004ND
2019-06-047091922002ND
2019-06-0470919220061.20 ppb
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2019-06-117093118001ND
2019-07-027096056003ND
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2019-07-027095944003ND
2019-07-027096056001ND
2019-07-0270960600010.650 ppb
2019-07-0270959440011.000 ppb
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2019-07-0370963370011.70 ppb
2019-07-037096337002ND
2019-07-037096334002ND
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2019-08-027099695002ND
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2019-08-027099700002ND
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2019-09-0370103521006ND
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2019-09-03701035210070.540 ppb
2019-09-03701035210022.50 ppb
2019-09-0370103521004ND
2019-09-04701036180010.520 ppb
2019-09-0470103615002ND
2019-09-04701036150012.10 ppb
2019-09-0470103618002ND
2019-09-0670104030003ND
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2019-10-0170106776004ND
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2019-10-01701067760070.510 ppb
2019-10-01701067760022.70 ppb
2019-10-0170106776006ND
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2019-10-0170106776005ND
2019-10-0270106990005ND
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2019-10-0270106990003ND
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2019-10-03701072150010.910 ppb
2019-10-0370107215003ND
2019-10-18701089870030.950 ppb
2019-10-18701089870022.30 ppb
2019-10-1870108987001ND
2019-11-01701103990010.680 ppb
2019-11-0170110399003ND
2019-11-04701105170011.20 ppb
2019-11-0470110517003ND
2019-11-04701105170040.820 ppb
2019-11-04701105170022.80 ppb
2019-11-0570110662002ND
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2019-11-0570110665002ND
2019-11-0870111149001ND
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2019-11-0870111149002ND
2019-12-0270113568003ND
2019-12-02701135440011.50 ppb
2019-12-0270113568001ND
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2019-12-02701135650040.770 ppb
2019-12-02701135440030.550 ppb
2019-12-02701135650022.10 ppb
2019-12-0270113568002ND
2019-12-0270113565003ND
2019-12-0370113655002ND
2019-12-03701136550012.00 ppb
2019-12-23701163440010.810 ppb