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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

City of Daly City

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane 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)

166

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20142.03 ppb32320.710 ppb - 3.92 ppb
20152.71 ppb32322.00 ppb - 4.47 ppb
20162.85 ppb32321.54 ppb - 4.28 ppb
20172.19 ppb3218ND - 4.71 ppb
20182.02 ppb3223ND - 6.21 ppb
20191.99 ppb3229ND - 3.49 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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
2014-01-041610-900-11353.02 ppb
2014-01-041610-901-12151.91 ppb
2014-01-041610-902-08252.79 ppb
2014-01-041610-903-12051.93 ppb
2014-01-041610-904-12002.83 ppb
2014-01-041610-905-12151.95 ppb
2014-01-041610-906-08151.87 ppb
2014-01-041610-907-08452.64 ppb
2014-04-041610-900-09351.06 ppb
2014-04-041610-901-15000.760 ppb
2014-04-041610-902-11551.20 ppb
2014-04-041610-903-10000.710 ppb
2014-04-041610-904-09501.08 ppb
2014-04-041610-905-10300.730 ppb
2014-04-041610-906-12250.820 ppb
2014-04-041610-907-12101.10 ppb
2014-07-051610-900-14001.79 ppb
2014-07-051610-901-15001.97 ppb
2014-07-051610-902-15551.90 ppb
2014-07-051610-903-14252.04 ppb
2014-07-051610-904-14151.70 ppb
2014-07-051610-905-14352.03 ppb
2014-07-051610-906-15401.74 ppb
2014-07-051610-907-16102.13 ppb
2014-10-041610-900-13002.74 ppb
2014-10-041610-901-12452.28 ppb
2014-10-041610-902-08053.92 ppb
2014-10-041610-903-12352.28 ppb
2014-10-041610-904-12152.68 ppb
2014-10-041610-905-12252.25 ppb
2014-10-041610-906-08153.70 ppb
2014-10-041610-907-07503.37 ppb
2015-01-171610-900-09354.47 ppb
2015-01-171610-901-09253.48 ppb
2015-01-171610-902-11003.51 ppb
2015-01-171610-903-09053.66 ppb
2015-01-171610-904-08403.39 ppb
2015-01-171610-905-08553.77 ppb
2015-01-171610-906-11253.34 ppb
2015-01-171610-907-11103.38 ppb
2015-04-031610-900-10202.38 ppb
2015-04-031610-901-11202.47 ppb
2015-04-031610-902-13152.86 ppb
2015-04-031610-903-11102.46 ppb
2015-04-031610-904-10502.41 ppb
2015-04-031610-905-11002.48 ppb
2015-04-031610-906-13302.55 ppb
2015-04-031610-907-12503.03 ppb
2015-07-031610-900-13502.29 ppb
2015-07-031610-901-14502.15 ppb
2015-07-031610-902-11402.48 ppb
2015-07-031610-903-14302.18 ppb
2015-07-031610-904-14002.27 ppb
2015-07-031610-905-14402.19 ppb
2015-07-031610-906-13202.45 ppb
2015-07-031610-907-13002.59 ppb
2015-10-031610-900-09002.33 ppb
2015-10-031610-901-10002.40 ppb
2015-10-031610-902-11102.35 ppb
2015-10-031610-903-09552.00 ppb
2015-10-031610-904-09352.28 ppb
2015-10-031610-905-09452.01 ppb
2015-10-031610-906-11202.48 ppb
2015-10-031610-907-10552.77 ppb
2016-01-081610-900-12102.11 ppb
2016-01-081610-901-11501.54 ppb
2016-01-081610-902-11302.17 ppb
2016-01-081610-903-12451.55 ppb
2016-01-081610-904-12302.07 ppb
2016-01-081610-905-12401.61 ppb
2016-01-081610-906-11201.65 ppb
2016-01-081610-907-10352.09 ppb
2016-04-071610-900-09203.33 ppb
2016-04-071610-901-09053.37 ppb
2016-04-071610-902-11302.82 ppb
2016-04-071610-903-10003.25 ppb
2016-04-071610-904-09403.44 ppb
2016-04-071610-905-09553.31 ppb
2016-04-071610-906-11452.61 ppb
2016-04-071610-907-11153.13 ppb
2016-07-021610-900-10102.74 ppb
2016-07-021610-901-10003.30 ppb
2016-07-021610-902-12003.27 ppb
2016-07-021610-903-09403.31 ppb
2016-07-021610-904-10152.84 ppb
2016-07-021610-905-09502.87 ppb
2016-07-021610-906-07153.03 ppb
2016-07-021610-907-07304.28 ppb
2016-10-071610-900-08352.99 ppb
2016-10-071610-901-08003.37 ppb
2016-10-071610-902-11003.29 ppb
2016-10-071610-903-08153.38 ppb
2016-10-071610-904-08452.63 ppb
2016-10-071610-905-08253.25 ppb
2016-10-071610-906-11203.51 ppb
2016-10-071610-907-10303.22 ppb
2017-01-141610-900-09104.62 ppb
2017-01-141610-901-09154.18 ppb
2017-01-141610-902-12004.36 ppb
2017-01-141610-903-08504.71 ppb
2017-01-141610-904-08404.49 ppb
2017-01-141610-905-09004.45 ppb
2017-01-141610-906-12204.41 ppb
2017-01-141610-907-11454.16 ppb
2017-04-061610-900-07453.41 ppb
2017-04-061610-901-07303.46 ppb
2017-04-061610-902-09553.80 ppb
2017-04-061610-903-08153.46 ppb
2017-04-061610-904-08053.41 ppb
2017-04-061610-905-08103.42 ppb
2017-04-061610-906-10203.74 ppb
2017-04-061610-907-09403.72 ppb
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
2017-10-071610-902-12253.64 ppb
2017-10-071610-903-1010ND
2017-10-071610-904-0950ND
2017-10-071610-905-1000ND
2017-10-071610-906-1240ND
2017-10-071610-907-12152.76 ppb
2018-01-061610-900-10501.81 ppb
2018-01-061610-901-10401.69 ppb
2018-01-061610-902-09202.19 ppb
2018-01-061610-903-11301.93 ppb
2018-01-061610-904-11051.80 ppb
2018-01-061610-905-11151.83 ppb
2018-01-061610-906-09551.86 ppb
2018-01-061610-907-09352.28 ppb
2018-04-071610-900-12006.07 ppb
2018-04-071610-901-12454.72 ppb
2018-04-071610-903-12355.04 ppb
2018-04-071610-904-12156.21 ppb
2018-04-071610-905-12254.26 ppb
2018-04-081610-902-10454.22 ppb
2018-04-081610-906-11005.07 ppb
2018-04-081610-907-10203.77 ppb
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
2018-07-071610-907-11552.70 ppb
2018-10-041610-900-0910ND
2018-10-041610-901-08201.12 ppb
2018-10-041610-902-10251.25 ppb
2018-10-041610-903-09001.35 ppb
2018-10-041610-904-0845ND
2018-10-041610-905-08551.13 ppb
2018-10-041610-906-10351.19 ppb
2018-10-041610-907-10101.30 ppb
2019-01-111610-900-08052.43 ppb
2019-01-111610-901-08332.15 ppb
2019-01-111610-902-11432.61 ppb
2019-01-111610-903-07482.40 ppb
2019-01-111610-904-08132.38 ppb
2019-01-111610-905-07572.02 ppb
2019-01-111610-906-11562.35 ppb
2019-01-111610-907-10513.07 ppb
2019-04-111610-900-11002.56 ppb
2019-04-111610-901-12053.00 ppb
2019-04-111610-902-13003.49 ppb
2019-04-111610-903-11553.01 ppb
2019-04-111610-904-11302.96 ppb
2019-04-111610-905-11452.75 ppb
2019-04-111610-906-13153.27 ppb
2019-04-111610-907-12453.13 ppb
2019-07-021610-900-0820ND
2019-07-021610-901-09301.10 ppb
2019-07-021610-902-11151.03 ppb
2019-07-021610-903-09001.05 ppb
2019-07-021610-904-08351.03 ppb
2019-07-021610-905-08501.05 ppb
2019-07-021610-906-1135ND
2019-07-021610-907-11001.02 ppb
2019-10-041610-900-14002.34 ppb
2019-10-041610-901-13101.51 ppb
2019-10-041610-903-13301.51 ppb
2019-10-041610-904-1350ND
2019-10-041610-905-13401.20 ppb
2019-10-051610-902-08402.11 ppb
2019-10-051610-906-09153.11 ppb
2019-10-051610-907-08552.02 ppb