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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Montara Water and Sanitary District

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

 

129

Samples

0

Samples exceeding legal limit (MCL)

24

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.228 ppb182ND - 2.60 ppb
20150.323 ppb131ND - 4.20 ppb
20161.25 ppb194ND - 8.10 ppb
20170.645 ppb404ND - 9.00 ppb
20182.07 ppb237ND - 12.0 ppb
20193.26 ppb166ND - 14.0 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
2014-01-201233-030-1150ND
2014-01-201233-031-1140ND
2014-01-201233-032-1110ND
2014-04-211233-030-1050ND
2014-04-211233-031-1030ND
2014-04-211233-032-1100ND
2014-05-135810-003-1000ND
2014-08-275810-001-1140ND
2014-08-275810-008-0845ND
2014-08-275810-011-0900ND
2014-08-275810-012-1200ND
2014-08-275810-014-1020ND
2014-08-275810-015-1120ND
2014-08-275810-900-10302.60 ppb
2014-09-035810-010-1400ND
2014-10-201233-030-10201.50 ppb
2014-10-201233-031-1010ND
2014-10-201233-032-1025ND
2015-01-191233-030-1055ND
2015-01-191233-031-1110ND
2015-01-191233-032-1000ND
2015-04-201233-031-1035ND
2015-04-201233-032-1045ND
2015-05-181233-030-1040ND
2015-07-201233-030-1110ND
2015-07-201233-031-1100ND
2015-07-201233-032-1120ND
2015-08-105810-900-12054.20 ppb
2015-10-191233-030-0850ND
2015-10-191233-031-1050ND
2015-10-191233-032-1015ND
2016-01-181233-030-1020ND
2016-01-181233-031-1110ND
2016-01-181233-032-1030ND
2016-01-285810-011-0930ND
2016-05-185810-030-1200ND
2016-05-185810-031-1150ND
2016-05-185810-032-1215ND
2016-08-245810-024-11306.10 ppb
2016-08-245810-900-10458.10 ppb
2016-08-245810-903-11153.60 ppb
2016-08-245810-904-11056.00 ppb
2016-09-155810-030-1035ND
2016-09-155810-031-1015ND
2016-09-155810-032-1045ND
2016-12-015810-031-1015ND
2016-12-015810-032-1035ND
2016-12-135810-030-1158ND
2016-12-191233-809-1100ND
2016-12-191233-811-1105ND
2017-01-255810-030-0915ND
2017-01-255810-031-0900ND
2017-01-255810-032-0930ND
2017-02-135810-809-1121ND
2017-02-135810-811-1122ND
2017-03-205810-809-1020ND
2017-03-205810-811-1027ND
2017-04-135810-003-1020ND
2017-04-135810-030-1020ND
2017-04-135810-031-1000ND
2017-04-135810-032-1040ND
2017-04-195810-809-1049ND
2017-04-195810-811-1059ND
2017-05-085810-809-1200ND
2017-05-085810-811-1200ND
2017-06-065810-809-1150ND
2017-06-065810-811-1150ND
2017-07-055810-809-1145ND
2017-07-055810-811-1145ND
2017-07-205810-003-1120ND
2017-07-205810-024-11009.00 ppb
2017-07-205810-900-10305.80 ppb
2017-07-205810-903-10455.60 ppb
2017-07-205810-904-10505.40 ppb
2017-08-075810-001-0900ND
2017-08-075810-008-1010ND
2017-08-075810-010-0915ND
2017-08-075810-012-1000ND
2017-08-075810-014-0930ND
2017-08-075810-015-0915ND
2017-08-075810-809-1100ND
2017-08-075810-811-1100ND
2017-09-065810-030-1110ND
2017-11-085810-001-1105ND
2017-11-085810-014-0920ND
2017-11-095810-030-1120ND
2017-11-095810-031-1040ND
2017-11-095810-032-1130ND
2017-11-095810-809-1100ND
2017-11-095810-811-1100ND
2018-02-075810-030-1315ND
2018-02-075810-031-1305ND
2018-02-075810-032-1400ND
2018-02-085810-014-0845ND
2018-02-085810-809-0930ND
2018-02-085810-811-09331.50 ppb
2018-06-185810-809-1210ND
2018-06-185810-811-1215ND
2018-07-265810-024-10307.20 ppb
2018-07-265810-030-1100ND
2018-07-265810-031-1140ND
2018-07-265810-032-1110ND
2018-07-265810-900-09056.90 ppb
2018-07-265810-901-113011.0 ppb
2018-07-265810-902-110512.0 ppb
2018-07-265810-903-10253.40 ppb
2018-07-265810-904-10155.70 ppb
2018-10-155810-809-0920ND
2018-10-155810-811-0920ND
2018-11-135810-015-0840ND
2018-11-155810-030-0900ND
2018-11-155810-031-0815ND
2018-11-155810-032-0835ND
2019-02-055810-809-1115ND
2019-02-055810-811-1110ND
2019-02-125810-015-0935ND
2019-02-195810-030-0940ND
2019-02-195810-031-0910ND
2019-02-195810-032-1000ND
2019-07-095810-809-1140ND
2019-07-095810-811-1140ND
2019-08-065810-024-11057.10 ppb
2019-08-065810-901-105513.0 ppb
2019-08-065810-902-104514.0 ppb
2019-08-065810-903-10255.40 ppb
2019-08-065810-904-10355.30 ppb
2019-08-145810-900-10507.40 ppb
2019-12-035810-809-0909ND
2019-12-035810-811-0913ND