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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Camp Pendleton (South)

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

 

242

Samples

0

Samples exceeding legal limit (MCL)

95

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.84 ppb4216ND - 9.40 ppb
20150.921 ppb3911ND - 5.70 ppb
20161.60 ppb3815ND - 7.20 ppb
20171.47 ppb4221ND - 6.10 ppb
20181.34 ppb4418ND - 13.0 ppb
20190.919 ppb3714ND - 5.70 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
2014-01-152168-801-11003.70 ppb
2014-01-152168-802-11302.90 ppb
2014-01-152168-803-11552.80 ppb
2014-01-152168-804-10156.40 ppb
2014-01-279590-039-1100ND
2014-01-299590-032-1115ND
2014-02-139590-030-1115ND
2014-03-139590-043-1045ND
2014-03-139590-044-1126ND
2014-03-259590-037-1205ND
2014-04-072168-801-11254.70 ppb
2014-04-072168-802-11503.80 ppb
2014-04-072168-803-12103.70 ppb
2014-04-072168-804-10207.70 ppb
2014-04-239590-009-0944ND
2014-04-239590-034-1115ND
2014-04-249590-022-1115ND
2014-04-259590-014-1150ND
2014-04-259590-036-1115ND
2014-04-289590-035-1210ND
2014-05-219590-030-1015ND
2014-05-219590-039-1050ND
2014-05-239590-049-1030ND
2014-06-119590-043-1140ND
2014-06-129590-044-1220ND
2014-06-249590-037-1100ND
2014-07-099590-049-1030ND
2014-07-092168-801-12003.60 ppb
2014-07-092168-802-12355.30 ppb
2014-07-092168-803-12502.60 ppb
2014-07-092168-804-11159.40 ppb
2014-07-149590-039-1120ND
2014-07-179590-030-1140ND
2014-08-219590-043-1155ND
2014-10-092168-801-12406.40 ppb
2014-10-092168-802-13055.60 ppb
2014-10-092168-803-13303.10 ppb
2014-10-092168-804-11455.50 ppb
2014-10-289590-030-1115ND
2014-11-059590-044-1245ND
2014-11-069590-049-1155ND
2014-11-209590-039-1255ND
2015-01-072168-801-12152.80 ppb
2015-01-072168-802-12454.70 ppb
2015-01-072168-803-13052.80 ppb
2015-01-072168-804-11253.10 ppb
2015-01-169590-030-1035ND
2015-01-219590-049-13151.20 ppb
2015-01-269590-039-1210ND
2015-01-269590-044-1136ND
2015-03-139590-043-1336ND
2015-03-139590-044-1310ND
2015-03-169590-020-1220ND
2015-03-169590-037-1250ND
2015-03-189590-019-1050ND
2015-03-189590-034-1242ND
2015-03-199590-018-0800ND
2015-03-249590-022-1105ND
2015-04-019590-036-1025ND
2015-04-072168-801-13252.50 ppb
2015-04-072168-802-14001.60 ppb
2015-04-072168-803-1420ND
2015-04-072168-804-11305.10 ppb
2015-04-099590-014-0945ND
2015-05-119590-039-1145ND
2015-05-129590-049-1135ND
2015-05-209590-030-1000ND
2015-05-209590-044-1035ND
2015-07-249590-030-1020ND
2015-07-279590-039-1300ND
2015-08-139590-035-1046ND
2015-08-249590-049-1145ND
2015-08-249590-051-1230ND
2015-10-072168-801-12305.70 ppb
2015-10-072168-802-13152.40 ppb
2015-10-072168-803-1345ND
2015-10-072168-804-11304.00 ppb
2015-10-149590-039-1230ND
2015-10-149590-049-1120ND
2015-10-159590-030-1215ND
2015-11-169590-051-1030ND
2016-01-072168-801-12524.60 ppb
2016-01-072168-802-13203.30 ppb
2016-01-072168-803-1345ND
2016-01-072168-804-11454.10 ppb
2016-01-139590-049-1230ND
2016-02-059590-039-1115ND
2016-02-119590-051-1130ND
2016-02-199590-030-1050ND
2016-04-072168-801-12503.60 ppb
2016-04-072168-802-13183.90 ppb
2016-04-072168-803-13503.50 ppb
2016-04-072168-804-11504.40 ppb
2016-04-219590-034-1236ND
2016-04-219590-035-1205ND
2016-04-269590-022-1105ND
2016-04-269590-037-1220ND
2016-04-279590-019-1248ND
2016-04-289590-043-1145ND
2016-04-289590-044-1102ND
2016-04-299590-014-11303.70 ppb
2016-04-299590-036-1048ND
2016-05-039590-030-1200ND
2016-05-059590-039-1115ND
2016-05-059590-051-1045ND
2016-05-129590-020-1130ND
2016-07-072168-801-12056.30 ppb
2016-07-072168-802-12407.20 ppb
2016-07-072168-803-1305ND
2016-07-072168-804-11005.40 ppb
2016-08-039590-039-1200ND
2016-08-089590-030-1130ND
2016-09-299590-044-1025ND
2016-10-072168-801-13252.30 ppb
2016-10-072168-802-12552.60 ppb
2016-10-072168-803-12151.70 ppb
2016-10-072168-804-11304.10 ppb
2016-11-019590-030-1115ND
2016-11-219590-039-1325ND
2017-01-062168-801-12102.20 ppb
2017-01-062168-802-11302.40 ppb
2017-01-062168-803-11002.70 ppb
2017-01-062168-804-13103.10 ppb
2017-01-099590-030-1140ND
2017-02-159590-039-1120ND
2017-03-079590-036-1110ND
2017-03-089590-014-11051.60 ppb
2017-03-099590-020-1115ND
2017-03-099590-035-1150ND
2017-03-099590-051-1230ND
2017-03-179590-019-1146ND
2017-03-179590-034-1240ND
2017-03-179590-037-1115ND
2017-03-239590-022-1250ND
2017-03-309590-043-1135ND
2017-03-309590-044-1115ND
2017-04-072168-801-12252.30 ppb
2017-04-072168-802-11552.60 ppb
2017-04-072168-803-11302.70 ppb
2017-04-072168-804-13202.60 ppb
2017-05-109590-039-12153.90 ppb
2017-05-119590-030-1245ND
2017-07-072168-801-09405.00 ppb
2017-07-072168-802-10123.20 ppb
2017-07-072168-803-10366.10 ppb
2017-07-072168-804-11224.70 ppb
2017-07-139590-030-1300ND
2017-07-219590-049-1310ND
2017-07-249590-039-10304.80 ppb
2017-08-099590-030-1405ND
2017-08-099590-032-1405ND
2017-08-099590-049-1400ND
2017-10-062168-801-10202.70 ppb
2017-10-062168-802-09401.90 ppb
2017-10-062168-803-09202.10 ppb
2017-10-062168-804-11001.60 ppb
2017-12-049590-032-1000ND
2017-12-059590-030-13102.00 ppb
2017-12-079590-039-12101.40 ppb
2017-12-139590-018-0740ND
2017-12-289590-049-1110ND
2018-01-052168-801-11258.60 ppb
2018-01-052168-802-11004.20 ppb
2018-01-052168-803-10353.50 ppb
2018-01-052168-804-12106.00 ppb
2018-01-099590-032-1320ND
2018-01-259590-039-11201.50 ppb
2018-02-059590-030-1315ND
2018-02-089590-014-1235ND
2018-02-129590-036-1335ND
2018-02-129590-049-1110ND
2018-02-149590-018-074013.0 ppb
2018-03-149590-051-1242ND
2018-03-159590-035-1200ND
2018-03-219590-034-1245ND
2018-03-229590-043-1125ND
2018-03-229590-044-1020ND
2018-03-269590-022-1340ND
2018-03-299590-019-1225ND
2018-03-299590-037-1302ND
2018-04-062168-801-10411.20 ppb
2018-04-062168-802-11191.70 ppb
2018-04-062168-803-11531.70 ppb
2018-04-062168-804-09481.10 ppb
2018-04-189590-020-1041ND
2018-04-249590-039-1220ND
2018-04-259590-030-1300ND
2018-05-019590-049-1300ND
2018-05-169590-032-1230ND
2018-07-062168-801-12452.10 ppb
2018-07-062168-802-12201.70 ppb
2018-07-062168-803-11501.90 ppb
2018-07-062168-804-13402.60 ppb
2018-07-239590-039-1145ND
2018-07-259590-030-1152ND
2018-07-279590-032-0822ND
2018-07-279590-049-0930ND
2018-10-052168-801-08101.40 ppb
2018-10-052168-802-08402.20 ppb
2018-10-052168-803-09072.90 ppb
2018-10-052168-804-09581.50 ppb
2018-11-139590-032-1245ND
2018-11-139590-049-1230ND
2018-11-199590-039-1100ND
2018-12-049590-030-0941ND
2019-01-072168-801-12202.90 ppb
2019-01-072168-802-11553.20 ppb
2019-01-072168-803-11253.10 ppb
2019-01-072168-804-13103.30 ppb
2019-01-099590-030-1230ND
2019-01-239590-039-1200ND
2019-01-289590-032-09451.20 ppb
2019-01-289590-049-10401.20 ppb
2019-01-309590-020-1052ND
2019-01-319590-034-1100ND
2019-02-219590-014-1320ND
2019-02-289590-051-1042ND
2019-03-019590-035-1102ND
2019-03-159590-043-1035ND
2019-03-159590-044-1120ND
2019-03-219590-019-1136ND
2019-03-219590-037-1100ND
2019-04-082168-801-09201.40 ppb
2019-04-082168-802-10301.90 ppb
2019-04-082168-803-10001.80 ppb
2019-04-082168-804-11401.90 ppb
2019-05-079590-032-0835ND
2019-05-079590-049-1025ND
2019-05-089590-039-1215ND
2019-05-099590-030-1100ND
2019-07-082168-801-11402.90 ppb
2019-07-082168-802-12105.70 ppb
2019-07-082168-803-12302.10 ppb
2019-07-082168-804-11001.40 ppb
2019-07-249590-039-1200ND
2019-07-309590-032-0730ND
2019-07-309590-049-0830ND
2019-09-199590-030-0638ND
2019-11-129590-039-1220ND
2019-11-149590-032-0710ND
2019-11-149590-049-0810ND
2019-12-039590-030-1110ND