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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

City of Mountain View

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

 

197

Samples

0

Samples exceeding legal limit (MCL)

80

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20148.02 ppb3214ND - 32.5 ppb
20159.95 ppb3615ND - 36.9 ppb
20166.63 ppb3212ND - 34.1 ppb
20172.78 ppb329ND - 17.9 ppb
20186.60 ppb3313ND - 22.7 ppb
20196.16 ppb3217ND - 23.5 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for dibromochloromethane 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
2014-01-301610-900-0945ND
2014-01-301610-901-1020ND
2014-01-301610-902-1005ND
2014-01-301610-903-10401.39 ppb
2014-01-301610-904-1140ND
2014-01-301610-905-11253.62 ppb
2014-01-301610-906-10553.06 ppb
2014-01-301610-907-11105.18 ppb
2014-05-071610-900-1000ND
2014-05-071610-901-1015ND
2014-05-071610-902-0950ND
2014-05-071610-903-0840ND
2014-05-071610-904-0930ND
2014-05-071610-905-091528.9 ppb
2014-05-071610-906-085032.5 ppb
2014-05-071610-907-090028.0 ppb
2014-08-061610-900-0955ND
2014-08-061610-901-1010ND
2014-08-061610-902-1020ND
2014-08-061610-903-1045ND
2014-08-061610-904-1130ND
2014-08-061610-905-112021.8 ppb
2014-08-061610-906-110021.7 ppb
2014-08-061610-907-111020.0 ppb
2014-11-051610-900-09205.02 ppb
2014-11-051610-901-0945ND
2014-11-051610-902-0935ND
2014-11-051610-903-0830ND
2014-11-051610-904-0730ND
2014-11-051610-905-074528.2 ppb
2014-11-051610-906-080029.3 ppb
2014-11-051610-907-081028.2 ppb
2015-02-201610-900-0830ND
2015-02-201610-901-0905ND
2015-02-201610-902-0845ND
2015-02-201610-903-0945ND
2015-02-201610-904-1040ND
2015-02-201610-905-102024.1 ppb
2015-02-201610-906-100033.5 ppb
2015-02-201610-907-101023.6 ppb
2015-03-101610-902-0940ND
2015-03-101610-905-082535.8 ppb
2015-03-101610-906-084032.5 ppb
2015-03-101610-907-090036.9 ppb
2015-05-131610-900-0805ND
2015-05-131610-901-0825ND
2015-05-131610-902-0840ND
2015-05-131610-903-0920ND
2015-05-131610-904-1010ND
2015-05-131610-905-095530.2 ppb
2015-05-131610-906-093030.5 ppb
2015-05-131610-907-094529.7 ppb
2015-08-131610-900-1015ND
2015-08-131610-901-1000ND
2015-08-131610-902-0950ND
2015-08-131610-903-0900ND
2015-08-131610-904-0845ND
2015-08-131610-905-081010.7 ppb
2015-08-131610-906-07558.22 ppb
2015-08-131610-907-074514.2 ppb
2015-11-121610-900-0800ND
2015-11-121610-901-1110ND
2015-11-121610-902-0840ND
2015-11-121610-903-0910ND
2015-11-121610-904-1050ND
2015-11-121610-905-102017.0 ppb
2015-11-121610-906-092013.0 ppb
2015-11-121610-907-094018.4 ppb
2016-02-101610-900-1015ND
2016-02-101610-901-0955ND
2016-02-101610-902-0940ND
2016-02-101610-903-0920ND
2016-02-101610-904-0810ND
2016-02-101610-905-083032.1 ppb
2016-02-101610-906-085033.4 ppb
2016-02-101610-907-090534.1 ppb
2016-05-111610-900-0900ND
2016-05-111610-901-0915ND
2016-05-111610-902-0930ND
2016-05-111610-903-1140ND
2016-05-111610-904-1025ND
2016-05-111610-905-104012.8 ppb
2016-05-111610-906-110012.4 ppb
2016-05-111610-907-111013.2 ppb
2016-08-101610-900-0800ND
2016-08-101610-901-0830ND
2016-08-101610-902-0820ND
2016-08-101610-903-0855ND
2016-08-101610-904-0945ND
2016-08-101610-905-093511.6 ppb
2016-08-101610-906-093011.7 ppb
2016-08-101610-907-091511.9 ppb
2016-11-091610-900-1055ND
2016-11-091610-901-1035ND
2016-11-091610-902-1045ND
2016-11-091610-903-1000ND
2016-11-091610-904-1110ND
2016-11-091610-905-092512.6 ppb
2016-11-091610-906-093512.1 ppb
2016-11-091610-907-094514.2 ppb
2017-02-081610-900-0720ND
2017-02-081610-901-0740ND
2017-02-081610-902-0735ND
2017-02-081610-903-1030ND
2017-02-081610-904-0915ND
2017-02-081610-905-093517.7 ppb
2017-02-081610-906-095517.7 ppb
2017-02-081610-907-101017.9 ppb
2017-05-091610-900-0720ND
2017-05-091610-901-0740ND
2017-05-091610-902-0755ND
2017-05-091610-903-0820ND
2017-05-091610-904-0950ND
2017-05-091610-905-0930ND
2017-05-091610-906-0840ND
2017-05-091610-907-0915ND
2017-08-091610-900-0710ND
2017-08-091610-901-0725ND
2017-08-091610-902-0740ND
2017-08-091610-903-0800ND
2017-08-091610-904-0900ND
2017-08-091610-905-08457.96 ppb
2017-08-091610-906-08307.19 ppb
2017-08-091610-907-08157.47 ppb
2017-11-071610-900-0820ND
2017-11-071610-901-0850ND
2017-11-071610-902-0840ND
2017-11-071610-903-0915ND
2017-11-071610-904-1015ND
2017-11-071610-905-10004.48 ppb
2017-11-071610-906-09454.19 ppb
2017-11-071610-907-09354.36 ppb
2018-02-141610-900-0710ND
2018-02-141610-901-0740ND
2018-02-141610-902-0755ND
2018-02-141610-903-0820ND
2018-02-141610-904-0930ND
2018-02-141610-905-091515.6 ppb
2018-02-141610-906-085513.9 ppb
2018-02-141610-907-084015.7 ppb
2018-05-091610-900-0750ND
2018-05-091610-901-0810ND
2018-05-091610-902-0820ND
2018-05-091610-903-0840ND
2018-05-091610-904-0950ND
2018-05-091610-905-093022.7 ppb
2018-05-091610-906-091020.3 ppb
2018-05-091610-907-090021.6 ppb
2018-08-081610-900-0715ND
2018-08-081610-901-0730ND
2018-08-081610-902-0740ND
2018-08-081610-903-0800ND
2018-08-081610-904-0900ND
2018-08-081610-905-084015.6 ppb
2018-08-081610-906-083014.6 ppb
2018-08-081610-907-081516.3 ppb
2018-11-159590-900-0850ND
2018-11-159590-901-0910ND
2018-11-159590-902-0920ND
2018-11-159590-903-09401.50 ppb
2018-11-159590-904-1050ND
2018-11-159590-905-104020.0 ppb
2018-11-159590-906-102020.0 ppb
2018-11-159590-907-101020.0 ppb
2018-12-069590-014-1200ND
2019-02-141610-900-09001.61 ppb
2019-02-141610-901-09151.63 ppb
2019-02-141610-902-09251.53 ppb
2019-02-141610-903-09451.64 ppb
2019-02-141610-904-10351.68 ppb
2019-02-141610-905-102514.9 ppb
2019-02-141610-906-101014.3 ppb
2019-02-141610-907-095515.9 ppb
2019-05-081610-900-0700ND
2019-05-081610-901-0715ND
2019-05-081610-902-0730ND
2019-05-081610-903-0800ND
2019-05-081610-904-0910ND
2019-05-081610-905-084018.5 ppb
2019-05-081610-906-083019.2 ppb
2019-05-081610-907-082020.2 ppb
2019-08-151610-900-0730ND
2019-08-151610-901-0740ND
2019-08-151610-902-0755ND
2019-08-151610-903-0815ND
2019-08-151610-904-0930ND
2019-08-151610-905-091022.7 ppb
2019-08-151610-906-084517.4 ppb
2019-08-151610-907-083023.5 ppb
2019-11-131610-900-0650ND
2019-11-131610-901-0710ND
2019-11-131610-902-0725ND
2019-11-131610-903-0740ND
2019-11-131610-904-0840ND
2019-11-131610-905-08307.71 ppb
2019-11-131610-906-08157.33 ppb
2019-11-131610-907-08007.34 ppb