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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

City of Mountain View

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.

 

197

Samples

0

Samples exceeding legal limit (MCL)

165

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20145.63 ppb32320.740 ppb - 19.0 ppb
20157.96 ppb3631ND - 31.8 ppb
20167.34 ppb3222ND - 28.2 ppb
20175.43 ppb3227ND - 12.2 ppb
20185.94 ppb3327ND - 16.7 ppb
20196.88 ppb3226ND - 26.6 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
2014-01-301610-900-09451.45 ppb
2014-01-301610-901-10201.12 ppb
2014-01-301610-902-10051.07 ppb
2014-01-301610-903-10402.72 ppb
2014-01-301610-904-11401.30 ppb
2014-01-301610-905-11255.37 ppb
2014-01-301610-906-10554.83 ppb
2014-01-301610-907-11106.97 ppb
2014-05-071610-900-10000.800 ppb
2014-05-071610-901-10150.750 ppb
2014-05-071610-902-09500.810 ppb
2014-05-071610-903-08400.810 ppb
2014-05-071610-904-09300.740 ppb
2014-05-071610-905-091518.2 ppb
2014-05-071610-906-085019.0 ppb
2014-05-071610-907-090018.5 ppb
2014-08-061610-900-09552.35 ppb
2014-08-061610-901-10102.49 ppb
2014-08-061610-902-10202.20 ppb
2014-08-061610-903-10452.26 ppb
2014-08-061610-904-11302.23 ppb
2014-08-061610-905-11208.79 ppb
2014-08-061610-906-11008.78 ppb
2014-08-061610-907-11108.38 ppb
2014-11-051610-900-09205.31 ppb
2014-11-051610-901-09452.12 ppb
2014-11-051610-902-09352.46 ppb
2014-11-051610-903-08302.44 ppb
2014-11-051610-904-07302.42 ppb
2014-11-051610-905-074514.3 ppb
2014-11-051610-906-080014.9 ppb
2014-11-051610-907-081014.6 ppb
2015-02-201610-900-08304.36 ppb
2015-02-201610-901-09054.48 ppb
2015-02-201610-902-08455.47 ppb
2015-02-201610-903-09454.62 ppb
2015-02-201610-904-10404.26 ppb
2015-02-201610-905-102024.8 ppb
2015-02-201610-906-100031.8 ppb
2015-02-201610-907-101026.4 ppb
2015-03-101610-902-09402.60 ppb
2015-03-101610-905-082511.5 ppb
2015-03-101610-906-084012.1 ppb
2015-03-101610-907-090013.7 ppb
2015-05-131610-900-0805ND
2015-05-131610-901-0825ND
2015-05-131610-902-08401.21 ppb
2015-05-131610-903-0920ND
2015-05-131610-904-1010ND
2015-05-131610-905-095528.1 ppb
2015-05-131610-906-093028.4 ppb
2015-05-131610-907-094527.6 ppb
2015-08-131610-900-10151.11 ppb
2015-08-131610-901-10001.05 ppb
2015-08-131610-902-09501.03 ppb
2015-08-131610-903-09001.01 ppb
2015-08-131610-904-0845ND
2015-08-131610-905-08106.52 ppb
2015-08-131610-906-07555.37 ppb
2015-08-131610-907-07458.05 ppb
2015-11-121610-900-08002.42 ppb
2015-11-121610-901-11102.49 ppb
2015-11-121610-902-08402.47 ppb
2015-11-121610-903-09102.95 ppb
2015-11-121610-904-10502.48 ppb
2015-11-121610-905-10206.25 ppb
2015-11-121610-906-09205.41 ppb
2015-11-121610-907-09406.64 ppb
2016-02-101610-900-10159.18 ppb
2016-02-101610-901-09559.35 ppb
2016-02-101610-902-09409.33 ppb
2016-02-101610-903-092010.9 ppb
2016-02-101610-904-08109.61 ppb
2016-02-101610-905-083027.0 ppb
2016-02-101610-906-085028.2 ppb
2016-02-101610-907-090527.7 ppb
2016-05-111610-900-09003.16 ppb
2016-05-111610-901-09153.18 ppb
2016-05-111610-902-09303.14 ppb
2016-05-111610-903-11403.22 ppb
2016-05-111610-904-10253.21 ppb
2016-05-111610-905-104010.7 ppb
2016-05-111610-906-110012.3 ppb
2016-05-111610-907-111011.4 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
2016-08-101610-905-09359.84 ppb
2016-08-101610-906-09309.57 ppb
2016-08-101610-907-091510.1 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
2016-11-091610-905-09257.92 ppb
2016-11-091610-906-09357.58 ppb
2016-11-091610-907-09458.52 ppb
2017-02-081610-900-07203.63 ppb
2017-02-081610-901-07404.22 ppb
2017-02-081610-902-07354.47 ppb
2017-02-081610-903-10304.34 ppb
2017-02-081610-904-09154.32 ppb
2017-02-081610-905-093511.6 ppb
2017-02-081610-906-095511.3 ppb
2017-02-081610-907-101012.2 ppb
2017-05-091610-900-07203.46 ppb
2017-05-091610-901-07403.60 ppb
2017-05-091610-902-07553.57 ppb
2017-05-091610-903-08203.85 ppb
2017-05-091610-904-09503.07 ppb
2017-05-091610-905-09306.65 ppb
2017-05-091610-906-08407.26 ppb
2017-05-091610-907-09157.10 ppb
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
2017-08-091610-905-08459.80 ppb
2017-08-091610-906-08309.30 ppb
2017-08-091610-907-08158.58 ppb
2017-11-071610-900-08204.03 ppb
2017-11-071610-901-08504.22 ppb
2017-11-071610-902-08404.07 ppb
2017-11-071610-903-09152.40 ppb
2017-11-071610-904-10153.78 ppb
2017-11-071610-905-100011.1 ppb
2017-11-071610-906-094510.9 ppb
2017-11-071610-907-093511.0 ppb
2018-02-141610-900-07101.53 ppb
2018-02-141610-901-07401.49 ppb
2018-02-141610-902-07551.55 ppb
2018-02-141610-903-08201.25 ppb
2018-02-141610-904-09301.34 ppb
2018-02-141610-905-091516.6 ppb
2018-02-141610-906-085514.8 ppb
2018-02-141610-907-084016.7 ppb
2018-05-091610-900-07501.63 ppb
2018-05-091610-901-08101.34 ppb
2018-05-091610-902-08201.50 ppb
2018-05-091610-903-08401.56 ppb
2018-05-091610-904-09501.39 ppb
2018-05-091610-905-093012.3 ppb
2018-05-091610-906-091013.0 ppb
2018-05-091610-907-090013.1 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
2018-08-081610-905-084014.8 ppb
2018-08-081610-906-083012.5 ppb
2018-08-081610-907-081514.1 ppb
2018-11-159590-900-08501.90 ppb
2018-11-159590-901-09101.70 ppb
2018-11-159590-902-09201.70 ppb
2018-11-159590-903-09402.30 ppb
2018-11-159590-904-10501.90 ppb
2018-11-159590-905-104014.0 ppb
2018-11-159590-906-102016.0 ppb
2018-11-159590-907-101014.0 ppb
2018-12-069590-014-1200ND
2019-02-141610-900-09003.84 ppb
2019-02-141610-901-09154.08 ppb
2019-02-141610-902-09254.07 ppb
2019-02-141610-903-09453.95 ppb
2019-02-141610-904-10353.56 ppb
2019-02-141610-905-102523.7 ppb
2019-02-141610-906-101022.6 ppb
2019-02-141610-907-095526.6 ppb
2019-05-081610-900-0700ND
2019-05-081610-901-07151.07 ppb
2019-05-081610-902-0730ND
2019-05-081610-903-0800ND
2019-05-081610-904-0910ND
2019-05-081610-905-084012.3 ppb
2019-05-081610-906-083011.6 ppb
2019-05-081610-907-082013.5 ppb
2019-08-151610-900-07301.27 ppb
2019-08-151610-901-07401.34 ppb
2019-08-151610-902-07551.33 ppb
2019-08-151610-903-08151.15 ppb
2019-08-151610-904-09301.23 ppb
2019-08-151610-905-091014.1 ppb
2019-08-151610-906-084510.9 ppb
2019-08-151610-907-083015.0 ppb
2019-11-131610-900-0650ND
2019-11-131610-901-07101.01 ppb
2019-11-131610-902-07251.000 ppb
2019-11-131610-903-07401.57 ppb
2019-11-131610-904-0840ND
2019-11-131610-905-083013.5 ppb
2019-11-131610-906-081513.3 ppb
2019-11-131610-907-080012.6 ppb