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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

City of Daly City

Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

192

Samples

0

Samples exceeding legal limit (MCL)

27

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.61 ppb3220ND - 2.83 ppb
20150.282 ppb324ND - 2.35 ppb
20160.110 ppb323ND - 1.45 ppb
2017ND320ND
2018ND320ND
2019ND320ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for bromoform 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
2014-01-041610-900-1135ND
2014-01-041610-901-12152.83 ppb
2014-01-041610-902-0825ND
2014-01-041610-903-12052.83 ppb
2014-01-041610-904-1200ND
2014-01-041610-905-12152.79 ppb
2014-01-041610-906-08152.70 ppb
2014-01-041610-907-0845ND
2014-04-041610-900-0935ND
2014-04-041610-901-15002.69 ppb
2014-04-041610-902-11552.50 ppb
2014-04-041610-903-10002.65 ppb
2014-04-041610-904-0950ND
2014-04-041610-905-10302.58 ppb
2014-04-041610-906-12252.34 ppb
2014-04-041610-907-12102.36 ppb
2014-07-051610-900-14002.22 ppb
2014-07-051610-901-15002.53 ppb
2014-07-051610-902-1555ND
2014-07-051610-903-14252.61 ppb
2014-07-051610-904-1415ND
2014-07-051610-905-14352.51 ppb
2014-07-051610-906-1540ND
2014-07-051610-907-1610ND
2014-10-041610-900-1300ND
2014-10-041610-901-12452.58 ppb
2014-10-041610-902-08052.65 ppb
2014-10-041610-903-12352.57 ppb
2014-10-041610-904-1215ND
2014-10-041610-905-12252.59 ppb
2014-10-041610-906-08152.25 ppb
2014-10-041610-907-07502.71 ppb
2015-01-171610-900-0935ND
2015-01-171610-901-09252.02 ppb
2015-01-171610-902-1100ND
2015-01-171610-903-0905ND
2015-01-171610-904-0840ND
2015-01-171610-905-0855ND
2015-01-171610-906-1125ND
2015-01-171610-907-1110ND
2015-04-031610-900-1020ND
2015-04-031610-901-11202.35 ppb
2015-04-031610-902-1315ND
2015-04-031610-903-11102.34 ppb
2015-04-031610-904-1050ND
2015-04-031610-905-11002.30 ppb
2015-04-031610-906-1330ND
2015-04-031610-907-1250ND
2015-07-031610-900-1350ND
2015-07-031610-901-1450ND
2015-07-031610-902-1140ND
2015-07-031610-903-1430ND
2015-07-031610-904-1400ND
2015-07-031610-905-1440ND
2015-07-031610-906-1320ND
2015-07-031610-907-1300ND
2015-10-031610-900-0900ND
2015-10-031610-901-1000ND
2015-10-031610-902-1110ND
2015-10-031610-903-0955ND
2015-10-031610-904-0935ND
2015-10-031610-905-0945ND
2015-10-031610-906-1120ND
2015-10-031610-907-1055ND
2016-01-081610-900-1210ND
2016-01-081610-901-1150ND
2016-01-081610-902-11301.45 ppb
2016-01-081610-903-1245ND
2016-01-081610-904-1230ND
2016-01-081610-905-1240ND
2016-01-081610-906-1120ND
2016-01-081610-907-1035ND
2016-04-071610-900-0920ND
2016-04-071610-901-09051.01 ppb
2016-04-071610-902-1130ND
2016-04-071610-903-10001.06 ppb
2016-04-071610-904-0940ND
2016-04-071610-905-0955ND
2016-04-071610-906-1145ND
2016-04-071610-907-1115ND
2016-07-021610-900-1010ND
2016-07-021610-901-1000ND
2016-07-021610-902-1200ND
2016-07-021610-903-0940ND
2016-07-021610-904-1015ND
2016-07-021610-905-0950ND
2016-07-021610-906-0715ND
2016-07-021610-907-0730ND
2016-10-071610-900-0835ND
2016-10-071610-901-0800ND
2016-10-071610-902-1100ND
2016-10-071610-903-0815ND
2016-10-071610-904-0845ND
2016-10-071610-905-0825ND
2016-10-071610-906-1120ND
2016-10-071610-907-1030ND
2017-01-141610-900-0910ND
2017-01-141610-901-0915ND
2017-01-141610-902-1200ND
2017-01-141610-903-0850ND
2017-01-141610-904-0840ND
2017-01-141610-905-0900ND
2017-01-141610-906-1220ND
2017-01-141610-907-1145ND
2017-04-061610-900-0745ND
2017-04-061610-901-0730ND
2017-04-061610-902-0955ND
2017-04-061610-903-0815ND
2017-04-061610-904-0805ND
2017-04-061610-905-0810ND
2017-04-061610-906-1020ND
2017-04-061610-907-0940ND
2017-07-011610-900-1355ND
2017-07-011610-901-1420ND
2017-07-011610-902-1155ND
2017-07-011610-903-1310ND
2017-07-011610-904-1340ND
2017-07-011610-905-1325ND
2017-07-011610-906-1135ND
2017-07-011610-907-1215ND
2017-10-071610-900-1018ND
2017-10-071610-901-1025ND
2017-10-071610-902-1225ND
2017-10-071610-903-1010ND
2017-10-071610-904-0950ND
2017-10-071610-905-1000ND
2017-10-071610-906-1240ND
2017-10-071610-907-1215ND
2018-01-061610-900-1050ND
2018-01-061610-901-1040ND
2018-01-061610-902-0920ND
2018-01-061610-903-1130ND
2018-01-061610-904-1105ND
2018-01-061610-905-1115ND
2018-01-061610-906-0955ND
2018-01-061610-907-0935ND
2018-04-071610-900-1200ND
2018-04-071610-901-1245ND
2018-04-071610-903-1235ND
2018-04-071610-904-1215ND
2018-04-071610-905-1225ND
2018-04-081610-902-1045ND
2018-04-081610-906-1100ND
2018-04-081610-907-1020ND
2018-07-071610-900-0955ND
2018-07-071610-901-0945ND
2018-07-071610-902-1135ND
2018-07-071610-903-1035ND
2018-07-071610-904-1020ND
2018-07-071610-905-1030ND
2018-07-071610-906-1125ND
2018-07-071610-907-1155ND
2018-10-041610-900-0910ND
2018-10-041610-901-0820ND
2018-10-041610-902-1025ND
2018-10-041610-903-0900ND
2018-10-041610-904-0845ND
2018-10-041610-905-0855ND
2018-10-041610-906-1035ND
2018-10-041610-907-1010ND
2019-01-111610-900-0805ND
2019-01-111610-901-0833ND
2019-01-111610-902-1143ND
2019-01-111610-903-0748ND
2019-01-111610-904-0813ND
2019-01-111610-905-0757ND
2019-01-111610-906-1156ND
2019-01-111610-907-1051ND
2019-04-111610-900-1100ND
2019-04-111610-901-1205ND
2019-04-111610-902-1300ND
2019-04-111610-903-1155ND
2019-04-111610-904-1130ND
2019-04-111610-905-1145ND
2019-04-111610-906-1315ND
2019-04-111610-907-1245ND
2019-07-021610-900-0820ND
2019-07-021610-901-0930ND
2019-07-021610-902-1115ND
2019-07-021610-903-0900ND
2019-07-021610-904-0835ND
2019-07-021610-905-0850ND
2019-07-021610-906-1135ND
2019-07-021610-907-1100ND
2019-10-041610-900-1400ND
2019-10-041610-901-1310ND
2019-10-041610-903-1330ND
2019-10-041610-904-1350ND
2019-10-041610-905-1340ND
2019-10-051610-902-0840ND
2019-10-051610-906-0915ND
2019-10-051610-907-0855ND