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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Sherman

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

 

147

Samples

0

Samples exceeding legal limit (MCL)

81

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.83 ppb1711ND - 10.00 ppb
20154.28 ppb2612ND - 21.6 ppb
20165.03 ppb2613ND - 25.3 ppb
20172.49 ppb2614ND - 10.9 ppb
20182.63 ppb2612ND - 9.16 ppb
20193.66 ppb2619ND - 14.3 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
2014-03-24Q14091650013.10 ppb
2014-03-24Q14091650032.30 ppb
2014-03-31AC48691ND
2014-03-31AC48690ND
2014-06-16Q14214030015.00 ppb
2014-06-16Q14214030021.20 ppb
2014-06-16Q14214030036.00 ppb
2014-06-16Q1421403004ND
2014-08-20Q14380150024.81 ppb
2014-08-20Q14380150197.10 ppb
2014-08-20Q1438015020ND
2014-08-20Q143801502110.00 ppb
2014-08-20Q14380150221.20 ppb
2014-11-13Q14559610203.50 ppb
2014-11-13Q1455961022ND
2014-11-13Q14559610233.90 ppb
2014-11-13Q1455961024ND
2015-03-17Q1509888011ND
2015-03-17Q15098880072.70 ppb
2015-03-17Q1509888008ND
2015-03-17Q15098880092.60 ppb
2015-03-17Q1509888010ND
2015-04-23Q1515169012ND
2015-04-23Q15151690141.10 ppb
2015-04-23Q1515169017ND
2015-04-23Q1515169023ND
2015-04-23Q1515169024ND
2015-04-23Q1515169027ND
2015-04-23Q1515169028ND
2015-04-23Q1515169030ND
2015-04-23Q15151690084.65 ppb
2015-04-23Q1515169009ND
2015-04-23Q15151690104.22 ppb
2015-04-23Q1515169011ND
2015-07-22Q152850800121.2 ppb
2015-07-22Q152850800521.6 ppb
2015-07-22Q1528508006ND
2015-07-22Q152850800717.8 ppb
2015-07-22Q15285080081.06 ppb
2015-11-03Q154335500218.0 ppb
2015-11-03Q15433550031.12 ppb
2015-11-03Q154335500415.2 ppb
2015-11-03Q1543355005ND
2016-01-20Q1602479010ND
2016-01-20Q1602479013ND
2016-01-20Q16024790048.24 ppb
2016-01-20Q1602479005ND
2016-01-20Q16024790068.02 ppb
2016-01-20Q1602479007ND
2016-04-11Q1614214003ND
2016-04-11Q1614214001ND
2016-04-11Q16142140098.86 ppb
2016-04-11Q1614214010ND
2016-04-11Q16142140117.97 ppb
2016-04-11Q1614214012ND
2016-07-14Q162866700122.3 ppb
2016-07-14Q162866700325.3 ppb
2016-07-14Q16286670041.47 ppb
2016-07-14Q162866700522.5 ppb
2016-07-14Q1628667006ND
2016-10-10Q164313400111.7 ppb
2016-10-10Q1643134002ND
2016-10-10Q164313400311.2 ppb
2016-10-10Q1643134004ND
2016-11-08Q16485030151.20 ppb
2016-11-08Q1648503017ND
2016-11-08Q16485030181.02 ppb
2016-11-08Q1648503011ND
2016-11-08Q16485030131.04 ppb
2017-01-12Q1701556011ND
2017-01-12Q17015560175.53 ppb
2017-01-12Q1701556001ND
2017-01-12Q17015560185.33 ppb
2017-01-12Q1701556002ND
2017-04-13Q17153060011.65 ppb
2017-04-13Q1715306002ND
2017-04-13Q17153060031.38 ppb
2017-04-13Q1715306004ND
2017-07-11Q1728660004ND
2017-07-11Q1728660016ND
2017-07-11Q17286600116.95 ppb
2017-07-11Q17286600238.14 ppb
2017-07-11Q1728660009ND
2017-07-11Q17286600018.00 ppb
2017-07-11Q1728660010ND
2017-10-10Q17515940161.22 ppb
2017-10-10Q17515940441.39 ppb
2017-10-10Q17515940181.36 ppb
2017-10-10Q1751594020ND
2017-10-10Q1751594022ND
2017-10-10Q175159400810.9 ppb
2017-10-10Q17515940131.56 ppb
2017-10-10Q17515940149.86 ppb
2017-10-10Q17515940151.58 ppb
2017-11-14Q1758437001ND
2018-01-10Q18012400321.02 ppb
2018-01-10Q1801240001ND
2018-01-10Q1801240003ND
2018-01-10Q1801240006ND
2018-01-10Q1801240007ND
2018-01-10Q1801240010ND
2018-01-10Q1801240012ND
2018-01-10Q18012400274.50 ppb
2018-01-10Q1801240028ND
2018-01-10Q18012400293.23 ppb
2018-01-10Q1801240030ND
2018-05-29Q18214050017.91 ppb
2018-05-29Q18214050031.06 ppb
2018-05-29Q18214050027.95 ppb
2018-05-29Q1821405004ND
2018-07-05Q18266050016.97 ppb
2018-08-20Q1833198004ND
2018-08-20Q18331980029.02 ppb
2018-08-20Q1833198007ND
2018-08-20Q18331980037.34 ppb
2018-08-20Q1833198008ND
2018-11-29Q1848810005ND
2018-11-29Q18488100039.16 ppb
2018-11-29Q18488100012.49 ppb
2018-11-29Q18488100047.66 ppb
2018-11-29Q1848810008ND
2019-02-12Q1906434003ND
2019-02-12Q1906434004ND
2019-02-12Q19064340061.21 ppb
2019-02-12Q19064340239.10 ppb
2019-02-12Q19064340241.51 ppb
2019-02-12Q19064340258.67 ppb
2019-02-12Q19064340261.61 ppb
2019-05-07Q19222720011.75 ppb
2019-05-07Q19222720031.46 ppb
2019-05-07Q19222720051.16 ppb
2019-05-07Q1922272007ND
2019-05-07Q1922272009ND
2019-05-07Q1922272011ND
2019-05-07Q19222720269.89 ppb
2019-05-07Q19222720271.57 ppb
2019-05-07Q19222720289.67 ppb
2019-05-07Q19222720291.52 ppb
2019-08-13Q195529100511.5 ppb
2019-08-13Q195529100114.3 ppb
2019-08-13Q19552910022.22 ppb
2019-08-13Q195529100310.4 ppb
2019-08-13Q19552910042.13 ppb
2019-11-14Q19769860011.55 ppb
2019-11-14Q1976986002ND
2019-11-14Q19769860034.06 ppb
2019-11-14Q1976986004ND