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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Soquel Creek Water District

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

 

163

Samples

0

Samples exceeding legal limit (MCL)

96

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.813 ppb3113ND - 2.90 ppb
20150.950 ppb209ND - 3.20 ppb
20161.42 ppb1812ND - 2.90 ppb
20170.833 ppb3012ND - 3.00 ppb
20183.33 ppb2215ND - 39.0 ppb
20197.03 ppb4235ND - 53.0 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
2014-01-221644-801-12401.70 ppb
2014-01-221644-802-12071.40 ppb
2014-01-221644-803-1420ND
2014-01-221644-804-13452.10 ppb
2014-02-255806-801-14562.40 ppb
2014-02-255806-804-15292.70 ppb
2014-04-249590-801-1030ND
2014-04-249590-802-11051.20 ppb
2014-04-249590-803-1305ND
2014-04-249590-804-13352.00 ppb
2014-07-229590-801-14271.60 ppb
2014-07-229590-802-14001.40 ppb
2014-07-229590-803-1338ND
2014-07-229590-804-13002.40 ppb
2014-09-221644-003-1040ND
2014-09-221644-004-0950ND
2014-09-221644-005-1015ND
2014-09-221644-036-1340ND
2014-09-231644-002-1455ND
2014-09-231644-007-1305ND
2014-09-231644-022-1335ND
2014-09-231644-034-1440ND
2014-09-231644-049-0935ND
2014-09-241644-037-1145ND
2014-09-241644-047-1335ND
2014-09-251644-012-1050ND
2014-10-061644-022-1455ND
2014-10-209590-801-09501.60 ppb
2014-10-209590-802-10251.80 ppb
2014-10-209590-803-1115ND
2014-10-209590-804-13152.90 ppb
2015-01-219590-801-10551.60 ppb
2015-01-219590-802-11251.50 ppb
2015-01-219590-803-1155ND
2015-01-219590-804-12253.20 ppb
2015-02-125806-054-0911ND
2015-04-075806-014-1505ND
2015-04-239590-801-1057ND
2015-04-239590-802-11321.80 ppb
2015-04-239590-803-1227ND
2015-04-239590-804-12553.00 ppb
2015-07-219590-801-1437ND
2015-07-219590-802-14581.60 ppb
2015-07-219590-803-1014ND
2015-07-219590-804-15202.40 ppb
2015-08-075806-054-1422ND
2015-10-229590-801-1530ND
2015-10-229590-802-15111.40 ppb
2015-10-229590-803-1422ND
2015-10-229590-804-14522.50 ppb
2015-11-245806-054-1358ND
2016-01-219590-801-09221.80 ppb
2016-01-219590-802-10031.80 ppb
2016-01-219590-803-1404ND
2016-01-219590-804-12502.20 ppb
2016-02-115806-054-1147ND
2016-04-219590-801-09391.50 ppb
2016-04-219590-802-13371.40 ppb
2016-04-219590-803-1023ND
2016-04-219590-804-14322.00 ppb
2016-05-175806-054-0935ND
2016-07-189590-801-13232.50 ppb
2016-07-189590-802-13522.30 ppb
2016-07-189590-803-1458ND
2016-07-189590-804-14322.80 ppb
2016-10-199590-801-10582.20 ppb
2016-10-199590-802-11222.20 ppb
2016-10-199590-803-1144ND
2016-10-199590-804-14002.90 ppb
2017-01-179590-801-11441.000 ppb
2017-01-179590-802-10432.10 ppb
2017-01-179590-803-0939ND
2017-01-179590-804-10111.80 ppb
2017-04-199590-801-12032.40 ppb
2017-04-199590-802-13222.40 ppb
2017-04-199590-803-1428ND
2017-04-199590-804-13551.80 ppb
2017-07-199590-801-16402.60 ppb
2017-07-199590-802-16092.00 ppb
2017-07-199590-803-1504ND
2017-07-199590-804-15412.70 ppb
2017-08-229590-004-1050ND
2017-09-139590-005-1234ND
2017-09-139590-036-1407ND
2017-09-199590-049-1109ND
2017-10-039590-054-1340ND
2017-10-049590-037-1155ND
2017-10-049590-054-1155ND
2017-10-059590-034-1207ND
2017-10-059590-047-1102ND
2017-10-109590-022-1311ND
2017-10-129590-012-0733ND
2017-10-129590-014-1335ND
2017-10-199590-801-10091.000 ppb
2017-10-199590-802-11042.20 ppb
2017-10-199590-803-1157ND
2017-10-199590-804-13033.00 ppb
2017-10-249590-007-1033ND
2017-10-249590-013-1106ND
2018-01-189590-801-10401.20 ppb
2018-01-189590-802-10583.20 ppb
2018-01-189590-803-1125ND
2018-01-189590-804-11532.80 ppb
2018-04-179590-801-1122ND
2018-04-179590-802-11532.30 ppb
2018-04-179590-803-1217ND
2018-04-179590-804-12442.60 ppb
2018-07-179590-801-1022ND
2018-07-179590-802-09441.90 ppb
2018-07-179590-803-0822ND
2018-07-179590-804-08582.40 ppb
2018-10-189590-801-0933ND
2018-10-189590-802-10122.00 ppb
2018-10-189590-803-1049ND
2018-10-189590-804-11532.40 ppb
2018-10-245867-805-11501.000 ppb
2018-11-065867-805-12422.00 ppb
2018-11-099590-055-14301.50 ppb
2018-11-195867-805-11101.000 ppb
2018-12-045867-805-12518.00 ppb
2018-12-185867-805-114039.0 ppb
2019-01-089590-054-12061.10 ppb
2019-01-155867-805-124313.0 ppb
2019-01-169590-054-1132ND
2019-01-239590-801-1254ND
2019-01-239590-802-12282.30 ppb
2019-01-239590-803-1122ND
2019-01-239590-804-11532.50 ppb
2019-01-239590-805-131420.0 ppb
2019-01-295867-805-112524.0 ppb
2019-02-125867-805-11585.00 ppb
2019-02-265867-805-121933.0 ppb
2019-03-135867-805-130053.0 ppb
2019-03-265867-805-113622.0 ppb
2019-04-095867-805-130719.0 ppb
2019-04-179590-801-10502.60 ppb
2019-04-179590-802-11202.70 ppb
2019-04-179590-803-1300ND
2019-04-179590-804-12153.30 ppb
2019-04-179590-805-134017.0 ppb
2019-04-235867-805-114217.0 ppb
2019-05-075867-805-11094.00 ppb
2019-05-215867-805-10292.00 ppb
2019-06-055867-805-12422.00 ppb
2019-07-025867-805-12112.00 ppb
2019-07-159590-801-10262.40 ppb
2019-07-159590-802-09462.30 ppb
2019-07-159590-803-1300ND
2019-07-159590-804-14172.20 ppb
2019-07-159590-805-08401.40 ppb
2019-07-165867-805-12122.00 ppb
2019-07-315867-805-11212.00 ppb
2019-10-085867-801-13354.00 ppb
2019-10-229590-801-08502.40 ppb
2019-10-229590-802-09152.20 ppb
2019-10-229590-803-0945ND
2019-10-229590-804-10352.80 ppb
2019-10-229590-805-11152.00 ppb
2019-11-055867-801-12093.00 ppb
2019-11-195867-801-11494.00 ppb
2019-12-035867-801-11553.00 ppb
2019-12-175867-801-122012.0 ppb
2019-12-305810-059-1137ND