Know Your Environment. Protect Your Health.

Dibromochloromethane

St John Water District 1

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.

 

136

Samples

0

Samples exceeding legal limit (MCL)

108

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20184.43 ppb3228ND - 11.4 ppb
20192.02 ppb3216ND - 6.50 ppb
20203.49 ppb1613ND - 9.20 ppb
20213.26 ppb1615ND - 4.60 ppb
20224.45 ppb2422ND - 7.60 ppb
20236.20 ppb1614ND - 10.5 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.1 ppb

The EWG Health Guideline of 0.1 ppb for dibromochloromethane was based on the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer and harm to fetal growth and development.

ppb = parts per billion

All test results

Date Lab ID Result
2018-03-1535380540001ND
2018-03-15353805400020.930 ppb
2018-03-15353805400030.930 ppb
2018-03-1535380540004ND
2018-03-1535380540001ND
2018-03-15353805400020.930 ppb
2018-03-15353805400030.930 ppb
2018-03-1535380540004ND
2018-06-14353986520014.20 ppb
2018-06-14353986520023.60 ppb
2018-06-14353986520033.90 ppb
2018-06-14353986520044.00 ppb
2018-06-14353986520014.20 ppb
2018-06-14353986520023.60 ppb
2018-06-14353986520033.90 ppb
2018-06-14353986520044.00 ppb
2018-09-063541614300111.4 ppb
2018-09-063541614300210.5 ppb
2018-09-063541614300310.5 ppb
2018-09-06354161430049.20 ppb
2018-09-063541614300111.4 ppb
2018-09-063541614300210.5 ppb
2018-09-063541614300310.5 ppb
2018-09-06354161430049.20 ppb
2018-12-10354363570012.50 ppb
2018-12-10354363570022.70 ppb
2018-12-10354363570033.80 ppb
2018-12-10354363570042.70 ppb
2018-12-10354363570012.50 ppb
2018-12-10354363570022.70 ppb
2018-12-10354363570033.80 ppb
2018-12-10354363570042.70 ppb
2019-03-1335454557001ND
2019-03-1335454557002ND
2019-03-1335454557003ND
2019-03-1335454557004ND
2019-03-1335454557001ND
2019-03-1335454557002ND
2019-03-1335454557003ND
2019-03-1335454557004ND
2019-06-11354752880011.40 ppb
2019-06-1135475288002ND
2019-06-11354752880031.40 ppb
2019-06-1135475288004ND
2019-06-11354752880011.40 ppb
2019-06-1135475288002ND
2019-06-11354752880031.40 ppb
2019-06-1135475288004ND
2019-09-12354975890016.50 ppb
2019-09-12354975890026.10 ppb
2019-09-12354975890035.50 ppb
2019-09-12354975890045.90 ppb
2019-09-12354975890016.50 ppb
2019-09-12354975890026.10 ppb
2019-09-12354975890035.50 ppb
2019-09-12354975890045.90 ppb
2019-12-09355175910012.70 ppb
2019-12-0935517591002ND
2019-12-09355175910032.80 ppb
2019-12-0935517591004ND
2019-12-09355175910012.70 ppb
2019-12-0935517591002ND
2019-12-09355175910032.80 ppb
2019-12-0935517591004ND
2020-03-1135537039001ND
2020-03-1135537039002ND
2020-03-11355370390031.000 ppb
2020-03-1135537039004ND
2020-06-11355562500011.50 ppb
2020-06-11355562500021.50 ppb
2020-06-11355562500031.50 ppb
2020-06-11355562500041.60 ppb
2020-09-03355756750019.20 ppb
2020-09-03355756750029.00 ppb
2020-09-03355756750036.70 ppb
2020-09-03355756750048.40 ppb
2020-12-10355983180013.80 ppb
2020-12-10355983180023.80 ppb
2020-12-10355983180033.80 ppb
2020-12-10355983180044.00 ppb
2021-03-18356205450011.60 ppb
2021-03-19356205450021.50 ppb
2021-03-19356205450031.50 ppb
2021-03-19356205450041.40 ppb
2021-06-30356444690014.20 ppb
2021-06-30356444690024.00 ppb
2021-06-30356444690034.00 ppb
2021-06-30356444690043.80 ppb
2021-09-24356671050014.10 ppb
2021-09-24356671050023.90 ppb
2021-09-24356671050033.90 ppb
2021-09-2435667105004ND
2021-12-21356863050014.50 ppb
2021-12-21356863050024.60 ppb
2021-12-21356863050034.60 ppb
2021-12-21356863050044.50 ppb
2022-03-10357029530010.820 ppb
2022-03-1035702953002ND
2022-03-1035702953003ND
2022-03-10357029530040.790 ppb
2022-06-08357257550013.20 ppb
2022-06-08357257550023.20 ppb
2022-06-08357257550033.20 ppb
2022-06-08357257550043.20 ppb
2022-06-08B2202689-0013.51 ppb
2022-06-08B2202689-0023.65 ppb
2022-06-08B2202689-0033.39 ppb
2022-06-08B2202689-0043.46 ppb
2022-07-25357342720016.80 ppb
2022-07-25357342720026.80 ppb
2022-07-25357342720037.10 ppb
2022-07-25357342720046.30 ppb
2022-09-07357450590015.20 ppb
2022-09-07357450590025.80 ppb
2022-09-07357450590037.20 ppb
2022-09-07357450590045.70 ppb
2022-12-01357634240016.30 ppb
2022-12-01357634240027.00 ppb
2022-12-01357634240037.60 ppb
2022-12-01357634240046.50 ppb
2023-03-1635786614001ND
2023-03-16357866140021.20 ppb
2023-03-16357866140030.810 ppb
2023-03-1635786614004ND
2023-06-21358083690016.60 ppb
2023-06-21358083690026.40 ppb
2023-06-21358083690036.80 ppb
2023-06-21358083690047.00 ppb
2023-09-183582841800110.5 ppb
2023-09-18358284180029.90 ppb
2023-09-183582841800310.00 ppb
2023-09-18358284180049.90 ppb
2023-12-27358505920016.50 ppb
2023-12-27358505920029.10 ppb
2023-12-27358505920037.20 ppb
2023-12-27358505920047.30 ppb