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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Hawthorne 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

 

152

Samples

0

Samples exceeding legal limit (MCL)

66

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.252 ppb266ND - 3.21 ppb
20150.991 ppb2510ND - 9.29 ppb
20160.438 ppb258ND - 4.77 ppb
20170.473 ppb2614ND - 1.70 ppb
20181.05 ppb2514ND - 12.0 ppb
20190.875 ppb2514ND - 3.19 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
2014-01-0724925-3ND
2014-01-1425022-1ND
2014-02-1125411-4ND
2014-02-1125411-2ND
2014-02-1125411-1ND
2014-02-1125411-30.550 ppb
2014-04-0126079-1ND
2014-04-0126079-3ND
2014-05-1626758-4ND
2014-05-1626758-2ND
2014-05-1626758-1ND
2014-05-1626758-30.540 ppb
2014-07-0127554-1ND
2014-07-0127554-3ND
2014-08-1828383-4ND
2014-08-1828383-2ND
2014-08-1828383-1ND
2014-08-1828383-30.690 ppb
2014-10-0729298-1ND
2014-10-0729298-3ND
2014-10-0729298-6ND
2014-10-0729298-50.770 ppb
2014-11-1829948-4ND
2014-11-1829948-2ND
2014-11-1829948-13.21 ppb
2014-11-1829948-30.800 ppb
2015-01-0630628-1ND
2015-01-0630628-3ND
2015-02-1331246-49.29 ppb
2015-02-1331246-2ND
2015-02-1331246-1ND
2015-02-1331246-30.520 ppb
2015-04-07DWS117-15.87 ppb
2015-04-07DWS117-3ND
2015-05-12DWS499-43.91 ppb
2015-05-12DWS499-2ND
2015-05-12DWS499-10.740 ppb
2015-05-12DWS499-30.770 ppb
2015-07-07DWS1055-11.19 ppb
2015-07-07DWS1055-3ND
2015-08-11DWSC184-4ND
2015-08-11DWSC184-2ND
2015-08-11DWSC184-1ND
2015-08-11DWSC184-30.850 ppb
2015-10-06DWSC542-1ND
2015-10-06DWSC542-3ND
2015-10-06DWSC542-50.860 ppb
2015-11-13DWS1933-4ND
2015-11-13DWS1933-2ND
2015-11-13DWS1933-10.780 ppb
2015-11-13DWS1933-3ND
2016-01-04DWSC967-1ND
2016-01-04DWSC967-3ND
2016-02-16DWS2248-44.77 ppb
2016-02-16DWS2248-2ND
2016-02-16DWS2248-1ND
2016-02-16DWS2248-30.530 ppb
2016-04-04DWSC1374-1ND
2016-04-04DWSC1374-3ND
2016-05-13DWS2962-41.11 ppb
2016-05-13DWS2962-2ND
2016-05-13DWS2962-1ND
2016-05-13DWS2962-3ND
2016-07-05DWSC1763-1ND
2016-07-05DWSC1763-3ND
2016-08-12DWS3596-41.53 ppb
2016-08-12DWS3596-2ND
2016-08-12DWS3596-1ND
2016-08-12DWS3596-3ND
2016-10-04DWSC2209-10.530 ppb
2016-10-04DWSC2209-3ND
2016-10-04DWSC2209-50.690 ppb
2016-11-14DWS4210-40.970 ppb
2016-11-14DWS4210-2ND
2016-11-14DWS4210-1ND
2016-11-14DWS4210-30.810 ppb
2017-01-03DWSC2559-1ND
2017-01-03DWSC2559-3ND
2017-02-16DWS4803-40.620 ppb
2017-02-16DWS4803-3ND
2017-02-16DWS4803-20.560 ppb
2017-02-16DWS4803-10.630 ppb
2017-04-04DWSC2930-1ND
2017-04-04DWSC2930-3ND
2017-05-15DWS5474-41.32 ppb
2017-05-15DWS5474-30.620 ppb
2017-05-15DWS5474-21.16 ppb
2017-05-15DWS5474-11.21 ppb
2017-07-05DWSC3427-1ND
2017-07-05DWSC3427-3ND
2017-08-16DWS6216-40.860 ppb
2017-08-16DWS6216-2ND
2017-08-16DWS6216-10.640 ppb
2017-08-16DWS6216-30.960 ppb
2017-10-03DWSC4031-1ND
2017-10-03DWSC4031-3ND
2017-10-03DWSC4031-6ND
2017-10-03DWSC4031-50.740 ppb
2017-11-1470360760041.70 ppb
2017-11-147036076002ND
2017-11-1470360760010.770 ppb
2017-11-1470360760030.520 ppb
2018-01-02DWSC4530-1ND
2018-01-02DWSC4530-3ND
2018-02-15DWS7852-41.19 ppb
2018-02-15DWS7852-2ND
2018-02-15DWS7852-10.520 ppb
2018-02-15DWS7852-30.640 ppb
2018-04-02DWSC5050-1ND
2018-04-02DWSC5050-3ND
2018-05-14DWS8658-41.76 ppb
2018-05-14DWS8658-20.750 ppb
2018-05-14DWS8658-11.45 ppb
2018-05-14DWS8658-31.51 ppb
2018-07-0218070327-01ND
2018-07-0218070327-03ND
2018-08-16233503800412.0 ppb
2018-08-162335038002ND
2018-08-162335038001ND
2018-08-1623350380031.20 ppb
2018-10-0118100403-01ND
2018-10-0118100403-03ND
2018-10-0118100403-050.750 ppb
2018-11-1518111316-041.03 ppb
2018-11-1518111316-021.55 ppb
2018-11-1518111316-010.810 ppb
2018-11-1518111316-031.17 ppb
2019-01-0219010305-02ND
2019-01-0219010305-04ND
2019-02-1419021315-040.680 ppb
2019-02-1419021315-020.790 ppb
2019-02-1419021315-010.570 ppb
2019-02-1419021315-030.620 ppb
2019-04-0119040301-02ND
2019-04-0119040301-04ND
2019-05-1630344460042.70 ppb
2019-05-163034446002ND
2019-05-163034446001ND
2019-05-1630344460031.70 ppb
2019-07-0119070311-001ND
2019-07-0119070311-004ND
2019-08-1519081427-0043.19 ppb
2019-08-1519081427-002ND
2019-08-1519081427-0011.46 ppb
2019-08-1519081427-0032.66 ppb
2019-10-0119100203-002ND
2019-10-0119100203-004ND
2019-11-1419111317-0041.44 ppb
2019-11-1419111317-0021.16 ppb
2019-11-1419111317-0011.63 ppb
2019-11-1419111317-0032.48 ppb
2019-11-1819112019-0060.790 ppb