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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Midland

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

 

199

Samples

0

Samples exceeding legal limit (MCL)

136

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.853 ppb3316ND - 2.80 ppb
20151.67 ppb3328ND - 3.69 ppb
20161.18 ppb3323ND - 2.47 ppb
20170.963 ppb3418ND - 3.34 ppb
20181.71 ppb3324ND - 5.30 ppb
20192.55 ppb3327ND - 7.46 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
2014-03-06Q1407215004ND
2014-03-06Q1407215005ND
2014-03-06Q1407215006ND
2014-03-06Q1407215007ND
2014-03-06Q14072150081.000 ppb
2014-03-06Q1407215003ND
2014-03-06Q14072150011.000 ppb
2014-03-06Q1407215002ND
2014-04-08Q14109380021.34 ppb
2014-04-08Q14109380041.70 ppb
2014-04-08Q14109380051.70 ppb
2014-04-08Q14109380081.60 ppb
2014-04-08Q14109380091.90 ppb
2014-04-08Q14109380101.80 ppb
2014-04-08Q1410938011ND
2014-04-08Q14109380121.50 ppb
2014-04-08Q14109380131.70 ppb
2014-07-23Q1430260001ND
2014-07-23Q14302600022.50 ppb
2014-07-23Q14302600032.40 ppb
2014-07-23Q14302600041.50 ppb
2014-07-23Q14302600052.80 ppb
2014-07-23Q1430260006ND
2014-07-23Q14302600072.60 ppb
2014-07-23Q1430260008ND
2014-10-27Q1454332003ND
2014-10-27Q1454332004ND
2014-10-27Q1454332005ND
2014-10-27Q14543320061.10 ppb
2014-10-27Q1454332007ND
2014-10-27Q1454332008ND
2014-10-27Q1454332001ND
2014-10-27Q1454332002ND
2015-01-21Q15019980151.60 ppb
2015-01-21Q15019980011.60 ppb
2015-01-21Q15019980021.50 ppb
2015-01-21Q15019980031.50 ppb
2015-01-21Q15019980041.10 ppb
2015-01-21Q15019980051.70 ppb
2015-01-21Q15019980061.50 ppb
2015-01-21Q1501998007ND
2015-04-15Q15142080121.78 ppb
2015-04-15Q15142080081.94 ppb
2015-04-15Q15142080011.74 ppb
2015-04-15Q15142080021.67 ppb
2015-04-15Q15142080031.75 ppb
2015-04-15Q1514208004ND
2015-04-15Q15142080051.81 ppb
2015-04-15Q15142080062.00 ppb
2015-04-15Q1514208007ND
2015-08-19Q15329300021.54 ppb
2015-08-19Q15329300032.44 ppb
2015-08-19Q15329300042.73 ppb
2015-08-19Q15329300053.49 ppb
2015-08-19Q15329300063.69 ppb
2015-08-19Q15329300071.88 ppb
2015-08-19Q15329300083.59 ppb
2015-08-19Q1532930009ND
2015-10-26Q15424830011.80 ppb
2015-10-26Q15424830021.82 ppb
2015-10-26Q15424830031.87 ppb
2015-10-26Q15424830042.15 ppb
2015-10-26Q15424830051.18 ppb
2015-10-26Q15424830072.04 ppb
2015-10-26Q15424830081.77 ppb
2015-10-26Q1542483009ND
2016-01-14Q16017030061.26 ppb
2016-01-14Q1601703008ND
2016-01-14Q16017030091.62 ppb
2016-01-14Q16017030101.19 ppb
2016-01-14Q16017030111.53 ppb
2016-01-14Q1601703012ND
2016-01-14Q16017030011.40 ppb
2016-01-14Q16017030021.80 ppb
2016-01-14Q1601703003ND
2016-04-20Q1615830003ND
2016-04-20Q16158300041.22 ppb
2016-04-20Q16158300051.12 ppb
2016-04-20Q16158300061.44 ppb
2016-04-20Q16158300071.84 ppb
2016-04-20Q16158300081.42 ppb
2016-04-20Q16158300091.96 ppb
2016-04-20Q1615830001ND
2016-07-19Q1629182003ND
2016-07-19Q1629182004ND
2016-07-19Q1629182005ND
2016-07-19Q16291820061.60 ppb
2016-07-19Q16291820072.28 ppb
2016-07-19Q16291820081.86 ppb
2016-07-19Q16291820012.47 ppb
2016-07-19Q1629182009ND
2016-10-20Q16448190011.12 ppb
2016-10-20Q16448190082.07 ppb
2016-10-20Q16448190041.84 ppb
2016-10-20Q16448190092.20 ppb
2016-10-20Q16448190051.42 ppb
2016-10-20Q16448190101.86 ppb
2016-10-20Q16448190062.35 ppb
2016-10-20Q1644819002ND
2017-01-23Q1703156007ND
2017-01-23Q1703156010ND
2017-01-23Q1703156003ND
2017-01-23Q17031560111.45 ppb
2017-01-23Q1703156004ND
2017-01-23Q1703156012ND
2017-01-23Q17031560051.19 ppb
2017-01-23Q17031560061.32 ppb
2017-01-23Q1703156013ND
2017-04-10Q17146260021.10 ppb
2017-04-10Q1714626003ND
2017-04-10Q1714626004ND
2017-04-10Q1714626005ND
2017-04-10Q1714626006ND
2017-04-10Q1714626009ND
2017-04-10Q17146260071.30 ppb
2017-04-10Q1714626008ND
2017-05-30Q1722927004ND
2017-07-18Q1729407002ND
2017-07-18Q17294070031.43 ppb
2017-07-18Q17294070042.49 ppb
2017-07-18Q17294070052.82 ppb
2017-07-18Q17294070062.42 ppb
2017-07-18Q17294070072.40 ppb
2017-07-18Q17294070083.34 ppb
2017-07-18Q1729407009ND
2017-10-25Q17547850021.95 ppb
2017-10-25Q17547850081.79 ppb
2017-10-25Q17547850031.52 ppb
2017-10-25Q17547850091.30 ppb
2017-10-25Q17547850041.48 ppb
2017-10-25Q17547850101.57 ppb
2017-10-25Q17547850051.86 ppb
2017-10-25Q1754785006ND
2018-01-08Q1800531008ND
2018-01-08Q18005310092.00 ppb
2018-01-08Q18005310101.89 ppb
2018-01-08Q18005310112.36 ppb
2018-01-08Q1800531012ND
2018-01-08Q1800531013ND
2018-01-08Q18005310142.30 ppb
2018-01-08Q1800531015ND
2018-04-18Q18158690041.71 ppb
2018-04-18Q1815869010ND
2018-04-18Q18158690011.28 ppb
2018-04-18Q18158690111.27 ppb
2018-04-18Q18158690021.62 ppb
2018-04-18Q18158690121.42 ppb
2018-04-18Q18158690061.37 ppb
2018-04-18Q18158690031.84 ppb
2018-04-18Q1815869013ND
2018-07-09Q1826695007ND
2018-07-09Q18266950084.68 ppb
2018-07-09Q18266950091.10 ppb
2018-07-09Q18266950012.51 ppb
2018-07-09Q18266950022.93 ppb
2018-07-09Q18266950032.44 ppb
2018-07-09Q18266950105.30 ppb
2018-07-09Q1826695004ND
2018-11-05Q18439870033.93 ppb
2018-11-05Q18439870041.47 ppb
2018-11-05Q18439870052.71 ppb
2018-11-05Q18439870063.50 ppb
2018-11-05Q18439870072.35 ppb
2018-11-05Q18439870081.18 ppb
2018-11-05Q18439870093.32 ppb
2018-11-05Q1843987010ND
2019-02-12Q1906241002ND
2019-02-12Q19062410033.82 ppb
2019-02-12Q19062410041.40 ppb
2019-02-12Q1906241005ND
2019-02-12Q19062410061.83 ppb
2019-02-12Q19062410073.57 ppb
2019-02-12Q19062410081.43 ppb
2019-02-12Q19062410093.87 ppb
2019-02-12Q19062410103.07 ppb
2019-04-23Q19162110072.40 ppb
2019-04-23Q19162110011.69 ppb
2019-04-23Q19162110082.06 ppb
2019-04-23Q19162110021.37 ppb
2019-04-23Q1916211009ND
2019-04-23Q19162110031.69 ppb
2019-04-23Q19162110102.19 ppb
2019-04-23Q1916211004ND
2019-07-17Q19455310025.69 ppb
2019-07-17Q19455310035.75 ppb
2019-07-17Q19455310044.71 ppb
2019-07-17Q19455310054.13 ppb
2019-07-17Q19455310063.76 ppb
2019-07-17Q19455310074.76 ppb
2019-07-17Q19455310087.46 ppb
2019-07-17Q1945531009ND
2019-10-24Q19737340022.69 ppb
2019-10-24Q19737340032.97 ppb
2019-10-24Q19737340042.54 ppb
2019-10-24Q19737340051.84 ppb
2019-10-24Q19737340071.90 ppb
2019-10-24Q19737340082.29 ppb
2019-10-24Q19737340093.30 ppb
2019-10-24Q1973734010ND