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EWG's Tap Water Database — 2021 UPDATE

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Total trihalomethanes (TTHMs)

South Farmingdale WD

Trihalomethanes are cancer-causing contaminants that form during water treatment with chlorine and other disinfectants. The total trihalomethanes group includes four chemicals: chloroform, bromodichloromethane, dibromochloromethane and bromoform. Read More.

Studies conducted in the U.S. and Europe have found that drinking tap water that carries disinfection byproducts increases the risk of developing bladder cancer. In animal studies, all trihalomethanes cause liver, kidney and intestinal tumors. Some human epidemiological studies also reported an association between disinfection byproducts and an increased risk of problems during pregnancy, including spontaneous miscarriage, cardiovascular defects, neural tube defects and low birth weight.

The health guideline of 0.15 parts per billion, or ppb, for the group of four trihalomethanes, or THM4/TTHM, was defined in a peer-reviewed scientific study by EWG and represents a one-in-one-million lifetime cancer risk level.

Click here to read more about disinfection byproducts.

 

635

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND1000ND
2015ND930ND
2016ND1030ND
2017ND1070ND
20180.0176 ppb1232ND - 1.27 ppb
20190.0780 ppb1093ND - 5.10 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.15 ppb

The health guideline of 0.15 parts per billion, or ppb, for the group of four trihalomethanes, or THM4/TTHM, was defined in a peer-reviewed scientific study by EWG and represents a one-in-one-million lifetime cancer risk level.

EPA Maximum Contaminant
Level (MCL) 80 ppb

The legal limit for the group of four trihalomethanes, established in 1998, was based on the need for residual disinfectant levels in water served to customers and the cost of treatment. This limit does not fully protect against the risk of cancer due to exposure to trihalomethanes.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-131401475-004-POCSND
2014-01-131401475-001-POCSND
2014-01-131401475-002-POCSND
2014-01-20140188-001-POCSND
2014-01-201401838-001-POCSND
2014-01-201401838-003-POCSND
2014-01-221401932-001-POCSND
2014-02-041402114-001-POCSND
2014-02-101402416-001-POCSND
2014-02-101402421-002-POCSND
2014-02-101402421-001-POCSND
2014-02-101402414-001-POCSND
2014-02-111402529-001-POCSND
2014-02-111402530-002-POCSND
2014-02-111402528-001-POCSND
2014-02-1102537-001-POCSND
2014-02-111402530-001-POCSND
2014-02-201402995-002-POCSND
2014-02-201402995-001-POCSND
2014-03-101403620-002-POCSND
2014-03-101403620-001-POCSND
2014-03-171403B47-009-POCSND
2014-03-171403B47-008-POCSND
2014-03-171403B47-006-POCSND
2014-03-241403G69-001-POCSND
2014-04-071404544-003-POCSND
2014-04-071404544-001-POCSND
2014-04-071404543-002-POCSND
2014-04-151404B58-001A-POCND
2014-05-121405797-001I-POCND
2014-05-141405A66-002E-POCND
2014-05-141405A68-001E-POCND
2014-05-141405A72-001-POCSND
2014-05-141405A66-003E-POCND
2014-05-151405B82-001I-POCND
2014-05-201405E52-002B-POCND
2014-05-201405E52-006A-POCND
2014-05-281405J67-001C-POCND
2014-06-021406094-001A-POCND
2014-06-091406604-001-POCSND
2014-06-091406604-003-POCSND
2014-06-161406B41-001-POCSND
2014-06-161406B40-002-POCSND
2014-06-161406B40-001-POCSND
2014-06-161406B42-003A-POCND
2014-06-161406B40-004-POCSND
2014-07-071407399-002-POCSND
2014-07-071407399-004-POCSND
2014-07-071407399-001-POCSND
2014-07-141407953-001-POCSND
2014-07-141407953-003-POCSND
2014-07-141407952-002A-POCND
2014-08-041408134-005-POCSND
2014-08-041408134-003-POCSND
2014-08-041408134-001-POCSND
2014-08-041408136-001-POCSND
2014-08-111408675-001-POCSND
2014-08-141408985-002-POCSND
2014-08-141408A32-002-POCSND
2014-08-141408985-001-POCSND
2014-08-181408C50-001-POCSND
2014-08-251408H70-002-POCSND
2014-08-251408H70-001-POCSND
2014-08-271408J62-003-POCSND
2014-08-271408J62-002-POCSND
2014-08-271408J62-004-POCSND
2014-09-021409121-003-POCSND
2014-09-02140918-001-POCSND
2014-09-021409118-002-POCSND
2014-09-021409121-002-POCSND
2014-09-021409121-001-POCSND
2014-09-081409537-001-POCSND
2014-09-081409537-003-POCSND
2014-10-061410393-003-POCSND
2014-10-061410393-005-POCSND
2014-10-061410393-002-POCSND
2014-10-061410393-001-POCSND
2014-10-061410393-004-POCSND
2014-10-141410940-001-POCSND
2014-10-151410A36-001-POCSND
2014-10-151410A35-001-POCSND
2014-11-031411114-002-POCSND
2014-11-03141114-001-POCSND
2014-11-031411115-001-POCSND
2014-11-051411300-003-POCSND
2014-11-051411300-002-POCSND
2014-11-101411585-001-POCSND
2014-11-101411583-001-POCSND
2014-11-101411591-002-POCSND
2014-11-101411591-004-POCSND
2014-11-101411585-003-POCSND
2014-11-101411591-001-POCSND
2014-11-171411B01-001-POCSND
2014-11-171411A99-001-POCSND
2014-12-011412071-001-POCSND
2014-12-011412072-004-POCSND
2014-12-011412072-001-POCSND
2014-12-011412071-003-POCSND
2014-12-011412072-002-POCSND
2014-12-151412A95-001-POCSND
2015-01-051501112-002-POCSND
2015-01-051501112-003-POCSND
2015-01-051501112-004-POCSND
2015-01-121501580-001-POCSND
2015-01-131501664-003-POCSND
2015-02-021502048-003-POCSND
2015-02-021502048-001-POCSND
2015-02-021502051-001-POCSND
2015-02-021502050-001-POCSND
2015-02-031502112-001-POCSND
2015-02-171502A25-001-POCSND
2015-02-181502B18-001-POCSND
2015-02-181502B18-004-POCSND
2015-02-181502B18-003-POCSND
2015-02-181502B26-001-POCSND
2015-02-181502B26-003-POCSND
2015-02-191502C09-001-POCSND
2015-02-191502C09-002-POCSND
2015-03-031503181-001-POCSND
2015-03-031503181-004-POCSND
2015-03-031503176-001-POCSND
2015-03-031503176-003-POCSND
2015-03-031503181-002-POCSND
2015-03-161503A68-001-POCSND
2015-04-061504342-001-POCSND
2015-04-071504418-003-POCSND
2015-04-071504418-001-POCSND
2015-04-071504418-002-POCSND
2015-04-131504901-001-POCSND
2015-04-131504901-003-POCSND
2015-04-141504A19-001-POCSND
2015-05-041505179-001D-POCND
2015-05-041505180-001D-POCND
2015-05-041505178-003-POCSND
2015-05-041505178-001-POCSND
2015-05-041505178-004-POCSND
2015-05-111505746-003DND
2015-05-111505746-001DND
2015-05-121505872-001D-POCND
2015-05-121505867-002A-POCND
2015-05-121505867-001D-POCND
2015-05-181505C84-001D-POCND
2015-06-081506660-002-POCSND
2015-06-081506660-004-POCSND
2015-06-161506D15-002-POCSND
2015-06-161506D15-001ND
2015-06-161506D15-003-POCSND
2015-06-301506N48-004-POCSND
2015-06-301506N48-005-POCSND
2015-06-301506N48-002-POCSND
2015-06-301506N48-003-POCSND
2015-06-301506N48-001-POCSND
2015-07-061507308-003-POCSND
2015-07-061507308-001-POCSND
2015-07-061507311-001-POCSND
2015-07-131507877-003-POCSND
2015-07-131507877-001-POCSND
2015-07-201508101-001-POCSND
2015-08-031508097-002-POCSND
2015-08-031508097-001-POCSND
2015-08-031508102-001-POCSND
2015-08-061508539-002-POCSND
2015-08-061508536-001-POCSND
2015-08-171508D38-001-POCSND
2015-08-251508J13-006-POCSND
2015-08-251508J13-002-POCSND
2015-08-251508J13-007-POCSND
2015-08-251508J13-001ND
2015-09-021509174-002ND
2015-09-021508J13-003-POCSND
2015-09-021509174-001-POCSND
2015-09-021509164-003-POCSND
2015-09-021509164-001-POCSND
2015-09-031509268-001ND
2015-09-031509268-003ND
2015-09-031509268-002ND
2015-09-101509697-004-POCSND
2015-10-061510301-001-POCSND
2015-10-071510512-001-POCSND
2015-10-071510512-003-POCSND
2015-10-131510512-005-POCSND
2015-10-151510B65-002-POCSND
2015-10-221510H85-001-POCSND
2015-11-021511095-002-POCSND
2015-11-021511095-011-POCSND
2015-11-021511095-010-POCSND
2015-11-021511095-008-POCSND
2015-11-021511095-005-POCSND
2015-11-021511095-001-POCSND
2015-11-041511283-001-POCSND
2015-11-041511289-003-POCSND
2015-11-041511289-001-POCSND
2015-12-081512629-004-POCSND
2016-01-041601099-006-POCSND
2016-01-051601208-003ND
2016-01-051601208-001ND
2016-01-081601464-002-POCSND
2016-01-081601464-001ND
2016-02-011602059-002ND
2016-02-011602059-004ND
2016-02-011602059-001ND
2016-02-021602215-001ND
2016-02-021602215-003ND
2016-02-021602214-001ND
2016-02-021602204-001ND
2016-02-041602451-001ND
2016-03-071603542-002-POCSND
2016-03-071603542-001-POCSND
2016-03-071603542-004ND
2016-03-081603573-003ND
2016-03-091603744-001ND
2016-03-091603745-002ND
2016-04-041604229-001-POCSND
2016-04-041604229-003ND
2016-04-041604229-002ND
2016-04-061604532-003ND
2016-04-061604532-001ND
2016-04-061604534-001ND
2016-04-061604533-001ND
2016-04-121604A93-001ND
2016-05-031605262-005ND
2016-05-031605262-002-POCSND
2016-05-031605268-002-POCSND
2016-05-031605258-003-POCSND
2016-05-031605268-005ND
2016-05-041605366-002ND
2016-05-041605366-004-POCND
2016-05-101605903-004-POCSND
2016-05-101605913-001ND
2016-05-101605903-002-POCSND
2016-05-191605H44-001-POCSND
2016-06-081606817-003ND
2016-06-081606817-001ND
2016-06-131606C12-002ND
2016-06-131606C12-001ND
2016-06-131606C12-003ND
2016-06-211606K95-001ND
2016-06-211606K95-003ND
2016-07-051607274-002-POCSND
2016-07-051607274-003ND
2016-07-051607274-001ND
2016-07-051607276-001ND
2016-07-051607276-003ND
2016-07-081607591-001ND
2016-07-261607M59-001ND
2016-07-261607M59-003ND
2016-08-011608078-001ND
2016-08-011608078-002ND
2016-08-031608407-001ND
2016-08-031608411-001ND
2016-08-031608410-001ND
2016-08-041608526-005ND
2016-08-041608533-001ND
2016-08-041608526-001ND
2016-08-041608526-002ND
2016-08-081608765-001ND
2016-08-081608769-001ND
2016-08-231608M25-001ND
2016-08-231608M25-006ND
2016-08-291608Q26-002ND
2016-09-071609422-003ND
2016-09-071609422-001ND
2016-09-091609669-002-POCSND
2016-09-091609669-001-POCSND
2016-09-091609669-004ND
2016-09-141609B26-003ND
2016-09-261609M53-003ND
2016-09-261609M53-002-POCSND
2016-10-05701197003ND
2016-10-06701332009ND
2016-10-06701332001ND
2016-10-12701919003ND
2016-10-12701919001ND
2016-10-12701919004-POCSND
2016-11-02703541001ND
2016-11-02703529001-POCSND
2016-11-02703541002ND
2016-11-02703529001ND
2016-11-02703541003ND
2016-11-02703529002ND
2016-11-03703645010ND
2016-11-03703645007ND
2016-11-03703645001-POCSND
2016-11-03703645002ND
2016-11-03703645003ND
2016-11-03703645012ND
2016-11-03703645013ND
2016-11-09704053001-POCSND
2016-11-15704556002-POCSND
2016-11-15704556001ND
2016-12-05706000003ND
2016-12-05706000005ND
2016-12-05706000002AND
2016-12-05706000004ND
2016-12-05706000001ND
2016-12-06706101002ND
2017-01-05708360003ND
2017-01-10708773001ND
2017-01-15708360001ND
2017-01-16709166001ND
2017-01-16709167006ND
2017-01-16709167006-POCSND
2017-01-16709167005-POCSND
2017-01-16709167005ND
2017-02-077010719002ND
2017-02-077010724002ND
2017-02-087010871004ND
2017-02-087010869001-POCSND
2017-02-087010865001ND
2017-02-087010869001ND
2017-02-147011298002ND
2017-02-147011298003-POCSND
2017-02-147011298001ND
2017-02-147011298003ND
2017-02-157011398002ND
2017-02-157011398001ND
2017-02-227011830001ND
2017-03-077012834001ND
2017-03-077012834003ND
2017-03-077012829001ND
2017-03-087012928006ND
2017-03-087012928001ND
2017-03-087012928003ND
2017-04-047014848005ND
2017-04-047014848007-POCSND
2017-04-047014848004-POCSND
2017-04-047014848007ND
2017-04-047014848005-POCSND
2017-04-047014848004ND
2017-04-107015394001ND
2017-04-107015394003ND
2017-04-247016748001ND
2017-04-247016749001ND
2017-04-267016988001ND
2017-05-027017493009-POCSND
2017-05-027017493004ND
2017-05-02017493009-POCSND
2017-05-027017493001ND
2017-05-027017493006ND
2017-05-027017493009ND
2017-05-197019063001ND
2017-05-227019240002-POCSND
2017-05-227019240004-POCSND
2017-05-227019240001-POCSND
2017-05-237019267002ND
2017-05-257019599001-POCSND
2017-05-257019599002-POCSND
2017-06-057020387002ND
2017-06-057020387003-POCSND
2017-06-057020387001-POCSND
2017-06-057020387001ND
2017-06-067020439001-POCSND
2017-06-067020439002-POCSND
2017-06-147021336005ND
2017-06-147021336003ND
2017-07-067023264003ND
2017-07-067023264001-POCSND
2017-07-067023264004-POCSND
2017-07-067023264002-POCSND
2017-07-147024152001ND
2017-07-147024152002ND
2017-07-147024152003ND
2017-08-037026055001ND
2017-08-037026055001-POCSND
2017-08-037026055002-POCSND
2017-08-087026584001ND
2017-08-087026584002ND
2017-08-157027286001ND
2017-08-157027289002ND
2017-08-177027448001ND
2017-08-217027752001ND
2017-08-217027752003ND
2017-08-287028349001ND
2017-08-287028349004ND
2017-08-287028349002ND
2017-09-067029073004-POCSND
2017-09-067029073005-POCSND
2017-09-067029073003-POCSND
2017-09-067029073002-POCSND
2017-09-197030271003-POCSND
2017-09-197030271001-POCSND
2017-09-197030271002-POCSND
2017-10-027031635001-POCSND
2017-10-027031635002-POCSND
2017-10-027031639002-POCSND
2017-10-027031635004-POCSND
2017-10-027031639001-POCSND
2017-10-037031728002ND
2017-10-037031728001-POCSND
2017-10-037031728004-POCSND
2017-10-117032528001-POCSND
2017-10-117032528002-POCSND
2017-10-117032520001-POCSND
2017-11-067034919002-POCSND
2017-11-067034919004-POCSND
2017-11-137035549001-POCSND
2017-11-137035549002-POCSND
2017-12-057037255002-POCSND
2017-12-057037255003-POCSND
2017-12-057037259001-POCSND
2017-12-057037255001-POCSND
2017-12-057037259002-POCSND
2017-12-127037959001-POCSND
2018-01-037039624004-POCSND
2018-01-037039624001-POCSND
2018-01-037039624002-POCSND
2018-01-037039622003-POCSND
2018-01-037039622001-POCSND
2018-01-087039807001-POCSND
2018-02-06042124001-POCSND
2018-02-067042124004-POCSND
2018-02-067042124003-POCSND
2018-02-067042124005-POCND
2018-02-147042975004-POCSND
2018-02-147042975005-POCSND
2018-02-147042975001-POCSND
2018-02-147042975002-POCSND
2018-02-217043523001-POCSND
2018-02-217043523002-POCSND
2018-02-277043963001-POCSND
2018-02-277043963002-POCSND
2018-03-057044417003-POCSND
2018-03-057044417001-POCSND
2018-03-147045254004-POCSND
2018-03-147045254001-POCSND
2018-03-147045254002-POCSND
2018-03-197045252001-POCSND
2018-04-037047087003ND
2018-04-037047087004ND
2018-04-037047087001ND
2018-04-047047270001ND
2018-04-04704727003ND
2018-04-057047387002ND
2018-04-057047387005ND
2018-04-057047387006ND
2018-04-107047807001ND
2018-05-017050121001ND
2018-05-087050862001ND
2018-05-087050862001-POCSND
2018-05-087050856001-POCSND
2018-05-087050862003ND
2018-05-087050856001ND
2018-05-087050859001-POCSND
2018-05-087050862003-POCSND
2018-05-087050856002ND
2018-05-097051129002ND
2018-05-097051129004ND
2018-05-157051724003-POCSND
2018-05-157051724001-POCSND
2018-05-157051732002-POCSND
2018-05-157051724007-POCSND
2018-05-227052407001ND
2018-06-047053571002ND
2018-06-047053571004ND
2018-06-147055002001ND
2018-06-147055002002ND
2018-06-197055362002-POCSND
2018-06-197055362003-POCSND
2018-06-197055362001-POCSND
2018-06-197055362004-POCSND
2018-07-027056891001-POCSND
2018-07-027056891002-POCSND
2018-07-107057661003-POCSND
2018-07-107057661001-POCSND
2018-07-107057661004-POCSND
2018-07-107057661002-POCSND
2018-07-167058328002-POCSND
2018-07-167058328001-POCSND
2018-08-077060681007-POCSND
2018-08-077060683001-POCSND
2018-08-077060678009-POCSND
2018-08-077060678001-POCSND
2018-08-077060681001-POCSND
2018-08-077060683002-POCSND
2018-08-077060678008-POCSND
2018-08-077060681008-POCSND
2018-08-077060678011-POCSND
2018-08-217062336001-POCSND
2018-08-217062330001-POCSND
2018-08-217062330003-POCSND
2018-08-217062336002ND
2018-08-217062332001-POCSND
2018-09-117064428004-POCSND
2018-09-117064428002-POCSND
2018-09-127064553003-POCSND
2018-09-127064553002-POCSND
2018-09-127064553004-POCSND
2018-09-127064553001-POCSND
2018-09-1770650050011.27 ppb
2018-09-177065005002ND
2018-09-197065337002-POCSND
2018-09-197065337003-POCSND
2018-10-027066570002-POCSND
2018-10-027066570001-POCSND
2018-10-027066567001-POCSND
2018-10-027066570003-POCSND
2018-10-027066570006-POCSND
2018-10-027066567002-POCSND
2018-10-157067959003-POCSND
2018-10-157067969001-POCSND
2018-10-157067969002-POCSND
2018-10-157067959002-POCSND
2018-10-237069606001-POCS0.900 ppb
2018-10-247068917001-POCSND
2018-10-247068917004-POCSND
2018-10-247068917005-POCSND
2018-10-247068917006-POCSND
2018-10-247068917002-POCSND
2018-10-247068917003-POCSND
2018-11-137070943005-POCSND
2018-11-137070948001-POCSND
2018-11-137070943003-POCSND
2018-11-137070943007-POCSND
2018-11-137070943002-POCSND
2018-11-137070943008-POCSND
2018-11-137070948002-POCSND
2018-11-137070943001-POCSND
2018-11-147071090002ND
2018-11-147071090001ND
2018-11-197071502001-POCSND
2018-12-057073011001-POCSND
2018-12-057073010001ND
2018-12-057073012001-POCSND
2018-12-117073622001-POCSND
2018-12-117073623001-POCSND
2018-12-267074934001-POCSND
2019-01-077075704002ND
2019-01-077075706001ND
2019-01-077075706002ND
2019-01-077075706003ND
2019-01-077075708003ND
2019-01-147076488002ND
2019-02-047078314001ND
2019-02-047078314002ND
2019-02-047078314003ND
2019-02-047078314001-POCSND
2019-02-067078657001ND
2019-02-067078656001ND
2019-02-127079299001ND
2019-02-127079301001ND
2019-02-137079425004ND
2019-02-137079421001ND
2019-02-137079425001ND
2019-02-137079425002ND
2019-02-137079421002ND
2019-03-047081167001ND
2019-03-047081166001ND
2019-03-127082036002ND
2019-03-127082036003ND
2019-03-127082036001ND
2019-03-267083435002ND
2019-04-047084625005ND
2019-04-047084616002ND
2019-04-047084625004ND
2019-04-107085277002-POCSND
2019-04-107085277001-POCSND
2019-04-107085277003-POCSND
2019-04-167086040001ND
2019-04-167086038002ND
2019-04-167086042001ND
2019-05-087088694001-POCSND
2019-05-087088706001ND
2019-05-087088700003ND
2019-05-087088700001ND
2019-05-087088706005ND
2019-05-087088706004ND
2019-05-087088694003ND
2019-05-137089290007ND
2019-05-137089290003ND
2019-05-137089290001ND
2019-05-147089463003ND
2019-05-147089463001ND
2019-05-1470894630061.60 ppb
2019-05-207090144001ND
2019-06-107092892002ND
2019-06-107092892003ND
2019-06-137093501001ND
2019-06-137093501002ND
2019-06-177093925003ND
2019-06-177093925001ND
2019-06-177093925002ND
2019-06-177093925004ND
2019-07-027096105003ND
2019-07-037096307001ND
2019-07-037096307003ND
2019-07-037096307002ND
2019-07-037096307004ND
2019-07-187098021003ND
2019-08-017099646003ND
2019-08-017099646001ND
2019-08-057099905001-POCSND
2019-08-057099905004ND
2019-08-057099905002ND
2019-08-08`70100525001ND
2019-08-0870100525002ND
2019-08-1470101358001ND
2019-08-1970101912003-POCSND
2019-08-2070102037001ND
2019-08-2070102037002ND
2019-08-2070102037003ND
2019-09-0970104204001ND
2019-09-1070104409006ND
2019-09-1070104409003ND
2019-09-1070104413003ND
2019-09-1070104409001ND
2019-09-1070104412001ND
2019-09-1070104409002ND
2019-09-16701050340021.80 ppb
2019-09-16701050340015.10 ppb
2019-10-0770107533003ND
2019-10-0770107533001ND
2019-10-0870107667001ND
2019-10-0870107689001ND
2019-10-0970107840004-POCSND
2019-10-0970107840003-POCSND
2019-10-0970107840002-POCSND
2019-10-2470109666003ND
2019-10-2470109666001ND
2019-10-2470109666002ND
2019-10-2970110059003ND
2019-10-2970110059001ND
2019-11-0670110876001ND
2019-11-0670110876002ND
2019-11-0770111092001ND
2019-11-0770111092002ND
2019-11-0770111092003ND
2019-11-1470111907001ND
2019-11-1470111907002ND
2019-11-1870112241001ND
2019-11-1870112239001ND
2019-12-0270113575001ND
2019-12-0270113573001ND
2019-12-0470114032001ND
2019-12-1070114744001ND
2019-12-1070114744002ND