Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Dibromochloromethane

Golden State Water Company - Clearlake System

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

 

114

Samples

0

Samples exceeding legal limit (MCL)

68

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20144.14 ppb12122.80 ppb - 5.50 ppb
20153.75 ppb882.40 ppb - 6.30 ppb
20162.50 ppb14141.30 ppb - 3.90 ppb
20170.827 ppb6433ND - 2.40 ppb
20180.150 ppb81ND - 1.20 ppb
2019ND80ND

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
2014-01-092706-003-10302.90 ppb
2014-01-092706-007-11052.80 ppb
2014-04-092706-003-11004.40 ppb
2014-06-042706-007-11204.50 ppb
2014-07-102706-007-08304.20 ppb
2014-08-132706-003-07354.60 ppb
2014-10-082706-003-06505.50 ppb
2014-10-082706-007-07155.20 ppb
2014-11-242706-003-09403.90 ppb
2014-11-242706-007-10004.60 ppb
2014-12-222706-007-12423.70 ppb
2014-12-232706-003-09383.40 ppb
2015-01-142706-003-07202.90 ppb
2015-01-142706-007-07452.90 ppb
2015-04-092706-003-09152.80 ppb
2015-04-092706-007-09402.40 ppb
2015-07-092706-003-13004.00 ppb
2015-07-092706-007-13155.90 ppb
2015-10-072706-003-11546.30 ppb
2015-10-072706-007-11402.80 ppb
2016-01-132706-003-11453.50 ppb
2016-01-132706-007-12052.70 ppb
2016-02-102706-003-12302.50 ppb
2016-02-102706-007-12502.40 ppb
2016-04-132706-003-11502.00 ppb
2016-04-132706-007-12152.00 ppb
2016-07-142706-003-12002.90 ppb
2016-07-142706-007-11352.40 ppb
2016-10-052706-003-11553.90 ppb
2016-10-052706-007-12203.80 ppb
2016-11-092706-003-12431.90 ppb
2016-11-092706-007-13102.30 ppb
2016-12-142706-003-12301.40 ppb
2016-12-142706-007-12051.30 ppb
2017-01-119590-003-11151.90 ppb
2017-01-119590-007-11501.70 ppb
2017-01-189590-003-09152.10 ppb
2017-01-189590-007-09351.80 ppb
2017-01-269590-003-10551.70 ppb
2017-01-269590-007-11101.40 ppb
2017-02-019590-002-13201.60 ppb
2017-02-019590-003-11502.20 ppb
2017-02-019590-007-09302.00 ppb
2017-02-089590-003-09102.10 ppb
2017-02-089590-007-09301.80 ppb
2017-03-039590-003-08351.60 ppb
2017-03-039590-007-08551.000 ppb
2017-03-089590-002-11151.20 ppb
2017-03-089590-003-1155ND
2017-03-089590-007-1220ND
2017-03-159590-002-09071.10 ppb
2017-03-159590-003-0944ND
2017-03-159590-007-1005ND
2017-03-229590-003-0920ND
2017-03-229590-007-0935ND
2017-03-299590-003-0935ND
2017-03-299590-007-0955ND
2017-04-129590-002-11251.20 ppb
2017-04-129590-003-0845ND
2017-04-129590-007-0910ND
2017-04-209590-002-0915ND
2017-04-209590-003-0940ND
2017-04-209590-007-1000ND
2017-04-269590-002-0835ND
2017-04-269590-003-0905ND
2017-04-269590-007-0925ND
2017-05-039590-003-09351.50 ppb
2017-05-039590-007-0955ND
2017-05-109590-002-08451.10 ppb
2017-05-109590-003-09151.10 ppb
2017-05-109590-007-0950ND
2017-05-179590-003-0904ND
2017-05-179590-007-1026ND
2017-05-249590-002-08451.10 ppb
2017-06-299590-002-09212.00 ppb
2017-06-299590-003-10061.10 ppb
2017-06-299590-007-0953ND
2017-07-059590-002-08552.10 ppb
2017-07-059590-003-09152.40 ppb
2017-07-059590-007-0935ND
2017-07-129590-002-13281.80 ppb
2017-07-129590-003-10402.40 ppb
2017-07-129590-007-1110ND
2017-07-199590-003-0915ND
2017-07-199590-007-0933ND
2017-07-269590-003-09191.000 ppb
2017-07-269590-007-0949ND
2017-08-029590-002-08451.60 ppb
2017-08-029590-003-0905ND
2017-08-029590-007-0925ND
2017-08-099590-002-11301.30 ppb
2017-08-099590-003-09401.20 ppb
2017-08-099590-007-0900ND
2017-08-169590-002-1010ND
2017-08-169590-003-08421.10 ppb
2017-08-169590-007-0910ND
2017-10-259590-003-09051.60 ppb
2017-10-259590-007-09352.10 ppb
2018-01-109590-003-0910ND
2018-01-109590-007-0940ND
2018-04-119590-003-0855ND
2018-04-119590-007-0915ND
2018-07-119590-003-0900ND
2018-07-119590-007-0920ND
2018-10-109590-003-08501.20 ppb
2018-10-109590-007-0915ND
2019-01-169590-003-0850ND
2019-01-169590-007-0915ND
2019-04-179590-003-0905ND
2019-04-179590-007-0935ND
2019-07-179590-003-0845ND
2019-07-179590-007-0910ND
2019-10-169590-003-0910ND
2019-10-169590-007-0930ND