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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of La Habra

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

 

209

Samples

0

Samples exceeding legal limit (MCL)

102

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20142.11 ppb3410ND - 58.0 ppb
20151.65 ppb3520ND - 13.3 ppb
20161.15 ppb3521ND - 4.50 ppb
20170.909 ppb3517ND - 6.60 ppb
20180.586 ppb3513ND - 3.10 ppb
20191.11 ppb3521ND - 4.80 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
2014-01-173761-028-1141ND
2014-01-173761-031-110758.0 ppb
2014-02-133761-801-14141.60 ppb
2014-02-133761-802-13281.50 ppb
2014-02-133761-803-13411.60 ppb
2014-02-133761-804-14251.50 ppb
2014-02-133761-805-14031.70 ppb
2014-02-133761-806-14411.40 ppb
2014-02-133761-807-12371.30 ppb
2014-02-133761-808-15201.80 ppb
2014-02-213761-031-1128ND
2014-04-143761-028-1412ND
2014-04-163761-031-1250ND
2014-05-153761-801-1021ND
2014-05-153761-802-0954ND
2014-05-153761-803-1000ND
2014-05-153761-804-1029ND
2014-05-153761-805-1008ND
2014-05-153761-806-0945ND
2014-05-153761-807-0936ND
2014-05-153761-808-0926ND
2014-07-213761-028-1429ND
2014-07-213761-031-1508ND
2014-08-143761-801-1025ND
2014-08-143761-802-1059ND
2014-08-143761-803-1045ND
2014-08-143761-804-10341.20 ppb
2014-08-143761-805-1052ND
2014-08-143761-806-1005ND
2014-08-143761-807-1013ND
2014-08-143761-808-0955ND
2014-09-043761-004-1124ND
2014-09-043761-028-1151ND
2014-09-043761-031-1055ND
2015-02-133761-801-12421.30 ppb
2015-02-133761-802-12201.70 ppb
2015-02-133761-803-12271.70 ppb
2015-02-133761-804-12501.20 ppb
2015-02-133761-805-12331.60 ppb
2015-02-133761-806-13031.30 ppb
2015-02-133761-807-1315ND
2015-02-133761-808-1330ND
2015-05-143761-801-12301.20 ppb
2015-05-143761-802-103013.3 ppb
2015-05-143761-803-11151.20 ppb
2015-05-143761-804-12151.20 ppb
2015-05-143761-805-11308.80 ppb
2015-05-143761-806-1145ND
2015-05-143761-807-10451.30 ppb
2015-05-143761-808-10309.10 ppb
2015-08-143761-801-1150ND
2015-08-143761-802-12251.80 ppb
2015-08-143761-803-1240ND
2015-08-143761-804-1205ND
2015-08-143761-805-13051.40 ppb
2015-08-143761-806-13203.50 ppb
2015-08-143761-807-1135ND
2015-08-143761-808-1120ND
2015-09-213761-004-1400ND
2015-09-213761-028-1515ND
2015-09-213761-031-1450ND
2015-11-093761-801-1354ND
2015-11-093761-802-1318ND
2015-11-093761-803-13291.20 ppb
2015-11-093761-804-1403ND
2015-11-093761-805-13441.30 ppb
2015-11-093761-806-1418ND
2015-11-093761-807-12501.20 ppb
2015-11-093761-808-13222.60 ppb
2016-02-083761-801-12361.60 ppb
2016-02-083761-802-13172.10 ppb
2016-02-083761-803-13122.00 ppb
2016-02-083761-804-12432.00 ppb
2016-02-083761-805-12561.80 ppb
2016-02-083761-806-13301.80 ppb
2016-02-083761-807-1339ND
2016-02-083761-808-11214.50 ppb
2016-05-093761-801-14252.40 ppb
2016-05-093761-802-14001.90 ppb
2016-05-093761-803-14151.50 ppb
2016-05-093761-804-14552.10 ppb
2016-05-093761-805-14302.00 ppb
2016-05-093761-806-15051.80 ppb
2016-05-093761-807-13002.90 ppb
2016-05-093761-808-11401.60 ppb
2016-08-083761-801-13531.50 ppb
2016-08-083761-802-13111.30 ppb
2016-08-083761-803-13201.60 ppb
2016-08-083761-804-14101.40 ppb
2016-08-083761-805-1329ND
2016-08-083761-806-14191.20 ppb
2016-08-083761-807-11221.10 ppb
2016-08-083761-808-1220ND
2016-09-163761-028-1125ND
2016-09-163761-031-1100ND
2016-10-043761-004-1530ND
2016-11-093761-801-1030ND
2016-11-093761-802-1102ND
2016-11-093761-803-1054ND
2016-11-093761-804-1035ND
2016-11-093761-805-1042ND
2016-11-093761-806-1115ND
2016-11-093761-807-1020ND
2016-11-093761-808-1134ND
2017-02-133761-801-1326ND
2017-02-133761-802-1148ND
2017-02-133761-803-1302ND
2017-02-133761-804-1336ND
2017-02-133761-805-1315ND
2017-02-133761-806-1357ND
2017-02-133761-807-1213ND
2017-02-133761-808-11056.60 ppb
2017-05-093761-801-10381.10 ppb
2017-05-093761-802-11121.30 ppb
2017-05-093761-803-11031.50 ppb
2017-05-093761-804-10471.20 ppb
2017-05-093761-805-10541.40 ppb
2017-05-093761-806-10221.40 ppb
2017-05-093761-807-10291.90 ppb
2017-05-093761-808-10102.40 ppb
2017-08-073761-801-14001.40 ppb
2017-08-073761-802-13101.70 ppb
2017-08-073761-803-13161.90 ppb
2017-08-073761-804-14132.00 ppb
2017-08-073761-805-13301.70 ppb
2017-08-073761-806-14281.40 ppb
2017-08-073761-807-11021.70 ppb
2017-08-073761-808-11511.20 ppb
2017-09-253761-028-1145ND
2017-09-273761-031-1435ND
2017-11-133761-801-1304ND
2017-11-133761-802-1221ND
2017-11-133761-803-1228ND
2017-11-133761-804-1320ND
2017-11-133761-805-1248ND
2017-11-133761-806-1343ND
2017-11-133761-807-1043ND
2017-11-133761-808-1127ND
2017-11-173761-004-1152ND
2018-02-123761-801-1306ND
2018-02-123761-802-1222ND
2018-02-123761-803-1234ND
2018-02-123761-804-1315ND
2018-02-123761-805-12491.10 ppb
2018-02-123761-806-13361.000 ppb
2018-02-123761-807-1148ND
2018-02-123761-808-1351ND
2018-05-073761-801-12261.70 ppb
2018-05-073761-802-12421.90 ppb
2018-05-073761-803-12562.20 ppb
2018-05-073761-804-13371.60 ppb
2018-05-073761-805-13112.40 ppb
2018-05-073761-806-14061.20 ppb
2018-05-073761-807-12121.20 ppb
2018-05-073761-808-11011.10 ppb
2018-08-163761-801-0944ND
2018-08-163761-802-10181.000 ppb
2018-08-163761-803-10101.000 ppb
2018-08-163761-804-0955ND
2018-08-163761-805-1003ND
2018-08-163761-806-0934ND
2018-08-163761-807-0926ND
2018-08-163761-808-09133.10 ppb
2018-09-143761-004-1140ND
2018-09-143761-028-1111ND
2018-09-143761-031-1042ND
2018-11-053761-801-1305ND
2018-11-053761-802-1409ND
2018-11-053761-803-1353ND
2018-11-053761-804-1320ND
2018-11-053761-805-1329ND
2018-11-053761-806-1216ND
2018-11-053761-807-1229ND
2018-11-053761-808-1050ND
2019-02-043761-801-1403ND
2019-02-043761-802-1252ND
2019-02-043761-803-1308ND
2019-02-043761-804-1151ND
2019-02-043761-805-13361.000 ppb
2019-02-043761-806-11521.80 ppb
2019-02-043761-807-1430ND
2019-02-043761-808-1033ND
2019-05-083761-801-11001.000 ppb
2019-05-083761-802-1022ND
2019-05-083761-803-10311.10 ppb
2019-05-083761-804-10481.000 ppb
2019-05-083761-805-10401.000 ppb
2019-05-083761-806-1003ND
2019-05-083761-807-1012ND
2019-05-083761-808-09511.20 ppb
2019-08-053761-801-13541.20 ppb
2019-08-053761-802-12401.000 ppb
2019-08-053761-803-12561.20 ppb
2019-08-053761-804-13431.10 ppb
2019-08-053761-805-13041.20 ppb
2019-08-053761-806-1133ND
2019-08-053761-807-14211.10 ppb
2019-08-053761-808-1433ND
2019-09-113761-004-1140ND
2019-09-113761-028-1025ND
2019-09-113761-031-1100ND
2019-11-043761-801-13073.50 ppb
2019-11-043761-802-14122.60 ppb
2019-11-043761-803-14004.40 ppb
2019-11-043761-804-13223.90 ppb
2019-11-043761-805-13404.80 ppb
2019-11-043761-806-12132.30 ppb
2019-11-043761-807-12271.40 ppb
2019-11-043761-808-10401.10 ppb