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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Wilmington Water Department

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.

MORE ABOUT THIS CONTAMINANT

 

193

Samples

0

Samples exceeding legal limit (MCL)

193

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201413.1 ppb12123.60 ppb - 36.3 ppb
201538.4 ppb39394.70 ppb - 110.0 ppb
201637.7 ppb26267.70 ppb - 68.8 ppb
201732.0 ppb40406.20 ppb - 61.7 ppb
201829.6 ppb36365.60 ppb - 65.0 ppb
201923.2 ppb40405.60 ppb - 53.1 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
2014-04-011079443001 TTHM10.6 ppb
2014-04-011079443002 TTHM36.3 ppb
2014-04-011079443003 TTHM17.1 ppb
2014-04-011079443004 TTHM5.20 ppb
2014-04-011079443006 TTHM3.60 ppb
2014-04-011079443007 TTHM14.2 ppb
2014-04-011079443008 TTHM11.2 ppb
2014-04-011079443009 TTHM12.5 ppb
2014-04-011079443010 TTHM9.30 ppb
2014-04-011079443011 TTHM8.80 ppb
2014-12-22S6038954.84 ppb
2014-12-22S60390423.6 ppb
2015-01-052047942001 TTHM4.70 ppb
2015-01-052047942002 TTHM22.1 ppb
2015-01-052047942003 TTHM17.4 ppb
2015-01-052047942004 TTHM13.7 ppb
2015-01-052047942005 TTHM48.2 ppb
2015-01-052047942006 TTHM13.7 ppb
2015-01-052047942007 TTHM11.9 ppb
2015-01-052047942008 TTHM20.6 ppb
2015-01-052047942009 TTHM21.1 ppb
2015-04-142065266001 TTHM9.30 ppb
2015-04-142065266002 TTHM7.10 ppb
2015-04-142065266003 TTHM24.6 ppb
2015-04-142065266004 TTHM19.5 ppb
2015-04-142065266005 TTHM14.5 ppb
2015-04-142065266006 TTHM18.6 ppb
2015-04-142065266007 TTHM32.1 ppb
2015-04-142065266008 TTHM17.3 ppb
2015-04-142065266009 TTHM37.9 ppb
2015-04-142065266010 TTHM22.4 ppb
2015-07-082082331001 TTHM40.3 ppb
2015-07-082082331002 TTHM90.6 ppb
2015-07-082082331003 TTHM106.0 ppb
2015-07-082082331004 TTHM74.7 ppb
2015-07-082082331005 TTHM107.0 ppb
2015-07-082082331006 TTHM96.3 ppb
2015-07-082082331007 TTHM53.5 ppb
2015-07-082082331008 TTHM110.0 ppb
2015-07-082082331009 TTHM105.0 ppb
2015-07-082082331010 TTHM23.0 ppb
2015-10-072100950001 TTHM16.3 ppb
2015-10-072100950003 TTHM38.8 ppb
2015-10-072100950004 TTHM32.2 ppb
2015-10-072100950005 TTHM27.6 ppb
2015-10-072100950006 TTHM37.3 ppb
2015-10-072100950007 TTHM33.8 ppb
2015-10-072100950008 TTHM28.6 ppb
2015-10-072100950009 TTHM49.7 ppb
2015-10-072100950010 TTHM36.2 ppb
2015-12-30S65901813.0 ppb
2016-04-042134195001 TTHM9.60 ppb
2016-04-042134195003 TTHM15.6 ppb
2016-04-042134195004 TTHM18.9 ppb
2016-04-042134195005 TTHM21.2 ppb
2016-04-042134195006 TTHM18.7 ppb
2016-04-042134195007 TTHM18.8 ppb
2016-04-042134195008 TTHM18.5 ppb
2016-04-042134195009 TTHM14.5 ppb
2016-04-042134195010 TTHM19.7 ppb
2016-07-26216210700249.1 ppb
2016-07-26216210700368.8 ppb
2016-07-26216210700468.1 ppb
2016-07-26216210700565.7 ppb
2016-07-26216210700664.3 ppb
2016-07-26216210700757.1 ppb
2016-07-26216210700835.7 ppb
2016-07-26216210700962.8 ppb
2016-10-032179446001 TTHM7.70 ppb
2016-10-032179446002 TTHM44.2 ppb
2016-10-032179446003 TTHM27.5 ppb
2016-10-032179446004 TTHM25.4 ppb
2016-10-032179446005 TTHM68.0 ppb
2016-10-032179446006 TTHM62.5 ppb
2016-10-032179446007 TTHM30.9 ppb
2016-10-032179446008 TTHM40.0 ppb
2016-10-032179446009 TTHM46.7 ppb
2017-01-042200080001 TTHM6.20 ppb
2017-01-042200080002 TTHM19.1 ppb
2017-01-042200080003 TTHM15.4 ppb
2017-01-042200080004 TTHM13.2 ppb
2017-01-042200080005 TTHM11.0 ppb
2017-01-042200080006 TTHM34.6 ppb
2017-01-042200080007 TTHM12.6 ppb
2017-01-042200080008 TTHM15.2 ppb
2017-01-042200080009 TTHM16.1 ppb
2017-04-042220361001 TTHM10.1 ppb
2017-04-042220361003 TTHM32.8 ppb
2017-04-042220361004 TTHM27.8 ppb
2017-04-042220361005 TTHM20.1 ppb
2017-04-042220361006 TTHM20.5 ppb
2017-04-042220361007 TTHM46.5 ppb
2017-04-042220361008 TTHM24.6 ppb
2017-04-042220361009 TTHM38.1 ppb
2017-04-042220361010 TTHM29.2 ppb
2017-04-052220361011 TTHM18.1 ppb
2017-07-182247510001 TTHM28.1 ppb
2017-07-182247510004 TTHM51.0 ppb
2017-07-182247510006 TTHM54.9 ppb
2017-07-182247510008 TTHM46.7 ppb
2017-07-182247510010 TTHM47.0 ppb
2017-07-182247510012 TTHM52.8 ppb
2017-07-182247510014 TTHM42.2 ppb
2017-07-182247510016 TTHM61.7 ppb
2017-07-182247510018 TTHM56.3 ppb
2017-07-182247510020 TTHM20.0 ppb
2017-10-03226296008 TTHM36.4 ppb
2017-10-032267296001 TTHM16.1 ppb
2017-10-032267296004 TTHM43.1 ppb
2017-10-032267296006 TTHM46.5 ppb
2017-10-032267296010 TTHM40.6 ppb
2017-10-032267296012 TTHM53.2 ppb
2017-10-032267296014 TTHM28.2 ppb
2017-10-032267296016 TTHM60.6 ppb
2017-10-032267296018 TTHM52.3 ppb
2017-10-032267296020 TTHM11.7 ppb
2017-12-27S78196217.4 ppb
2018-01-032287060001 TTHM5.60 ppb
2018-01-032287060004 TTHM27.3 ppb
2018-01-032287060006 TTHM27.0 ppb
2018-01-032287060008 TTHM17.2 ppb
2018-01-032287060010 TTHM13.6 ppb
2018-01-032287060012 TTHM33.0 ppb
2018-01-032287060014 TTHM12.7 ppb
2018-01-032287060016 TTHM35.3 ppb
2018-01-032287060018 TTHM23.8 ppb
2018-04-032306959001 TTHM26.3 ppb
2018-04-032306959003 TTHM19.1 ppb
2018-04-032306959005 TTHM7.70 ppb
2018-04-032306959007 TTHM18.4 ppb
2018-04-032306959009 TTHM16.4 ppb
2018-04-032306959011 TTHM15.8 ppb
2018-04-032306959013 TTHM25.8 ppb
2018-04-032306959015 TTHM21.9 ppb
2018-04-032306959017 TTHM14.3 ppb
2018-07-022324450001 TTHM26.0 ppb
2018-07-022324450003 TTHM46.0 ppb
2018-07-022324450004 TTHM55.6 ppb
2018-07-022324450005 TTHM39.4 ppb
2018-07-022324450006 TTHM43.4 ppb
2018-07-022324450007 TTHM51.9 ppb
2018-07-022324450008 TTHM52.8 ppb
2018-07-022324450009 TTHM65.0 ppb
2018-07-022324450010 TTHM45.8 ppb
2018-10-022342141001 TTHM10.6 ppb
2018-10-022342141004 TTHM28.2 ppb
2018-10-022342141006 TTHM23.9 ppb
2018-10-022342141008 TTHM23.1 ppb
2018-10-022342141010 TTHM25.8 ppb
2018-10-022342141012 TTHM59.7 ppb
2018-10-022342141014 TTHM27.3 ppb
2018-10-022342141016 TTHM48.7 ppb
2018-10-022342141018 TTHM32.1 ppb
2019-01-033009447001 TTHM8.30 ppb
2019-01-033009447004 TTHM18.8 ppb
2019-01-033009447006 TTHM13.8 ppb
2019-01-033009447008 TTHM12.1 ppb
2019-01-033009447010 TTHM11.3 ppb
2019-01-033009447012 TTHM33.5 ppb
2019-01-033009447014 TTHM14.1 ppb
2019-01-033009447016 TTHM27.1 ppb
2019-01-033009447018 TTHM16.3 ppb
2019-01-033009447020 TTHM6.60 ppb
2019-04-023026194001 TTHM5.60 ppb
2019-04-023026194003 TTHM15.7 ppb
2019-04-023026194004 TTHM13.4 ppb
2019-04-023026194005 TTHM12.4 ppb
2019-04-023026194006 TTHM9.80 ppb
2019-04-023026194007 TTHM12.2 ppb
2019-04-023026194008 TTHM12.5 ppb
2019-04-023026194009 TTHM21.6 ppb
2019-04-023026194010 TTHM17.6 ppb
2019-04-023026194011 TTHM6.50 ppb
2019-07-013043203001 TTHM18.5 ppb
2019-07-013043203004 TTHM37.6 ppb
2019-07-013043203006 THHM29.2 ppb
2019-07-013043203008 TTHM26.3 ppb
2019-07-013043203010 TTHM34.7 ppb
2019-07-013043203012 TTHM33.0 ppb
2019-07-013043203014 TTHM23.0 ppb
2019-07-013043203016 TTHM50.8 ppb
2019-07-013043203018 TTHM30.9 ppb
2019-07-013043203020 TTHM19.0 ppb
2019-10-023061934001 TTHM18.5 ppb
2019-10-023061934004 TTHM36.6 ppb
2019-10-023061934006 TTHM41.9 ppb
2019-10-023061934008 TTHM29.7 ppb
2019-10-023061934010 TTHM31.3 ppb
2019-10-023061934012 TTHM44.2 ppb
2019-10-023061934014 TTHM27.4 ppb
2019-10-023061934016 TTHM53.1 ppb
2019-10-023061934018 TTHM40.7 ppb
2019-10-023061934020 TTHM13.7 ppb