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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

Regional Water Authority

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.

MORE ABOUT THIS CONTAMINANT

 

352

Samples

0

Samples exceeding legal limit (MCL)

323

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20146.14 ppb5854ND - 18.2 ppb
20154.97 ppb5953ND - 17.1 ppb
20166.47 ppb5854ND - 24.6 ppb
20176.20 ppb6053ND - 15.0 ppb
20187.74 ppb5855ND - 16.0 ppb
20197.45 ppb5954ND - 18.0 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
2014-03-04DBP 2003919545.00 ppb
2014-03-04DBP 2003919595.30 ppb
2014-03-04DBP 2003919745.20 ppb
2014-03-04VOC1 2003919631.60 ppb
2014-03-04VOC1 2003919641.40 ppb
2014-03-04VOC1 2003919652.20 ppb
2014-03-04VOC1 2003919770.700 ppb
2014-03-04VOC1 200391978ND
2014-03-04VOC1 200391979ND
2014-03-04VOC1 2003919803.20 ppb
2014-03-04VOC1 2003920051.000 ppb
2014-03-04VOC1 200392007ND
2014-03-05DBP 2003920927.00 ppb
2014-03-05DBP 2003920936.40 ppb
2014-03-05DBP 20039209412.2 ppb
2014-03-06DBP 20039215210.00 ppb
2014-03-06DBP 2003922017.10 ppb
2014-03-06DBP 2003922027.10 ppb
2014-03-07DBP 2003923064.40 ppb
2014-03-07DBP 2003923075.70 ppb
2014-03-07DBP 2003923086.40 ppb
2014-03-25VOC1 200393100ND
2014-06-02DBP 2003969487.40 ppb
2014-06-02DBP 2003969496.50 ppb
2014-06-02DBP 20039695013.8 ppb
2014-06-03DBP 2003969595.70 ppb
2014-06-03DBP 2003969645.40 ppb
2014-06-03DBP 2003969825.40 ppb
2014-06-03DBP 2003970736.20 ppb
2014-06-05DBP 20039722912.8 ppb
2014-06-05DBP 2003973275.80 ppb
2014-06-05DBP 2003973287.80 ppb
2014-06-06DBP 2003973547.30 ppb
2014-06-06DBP 2003973557.00 ppb
2014-09-02DBP 2004032725.10 ppb
2014-09-02DBP 2004032776.50 ppb
2014-09-02DBP 2004033025.70 ppb
2014-09-03DBP 2004034707.20 ppb
2014-09-03DBP 2004034715.60 ppb
2014-09-03DBP 2004034727.40 ppb
2014-09-04DBP 20040351718.2 ppb
2014-09-04DBP 2004035565.40 ppb
2014-09-04DBP 2004035576.00 ppb
2014-09-04DBP 2004035586.20 ppb
2014-09-06DBP 20040368716.1 ppb
2014-09-06DBP 2004036884.40 ppb
2014-12-02DBP 2004086834.20 ppb
2014-12-02DBP 2004086884.60 ppb
2014-12-02DBP 2004087065.20 ppb
2014-12-02DBP 2004087486.00 ppb
2014-12-02DBP 2004087496.60 ppb
2014-12-02DBP 2004087503.40 ppb
2014-12-03DBP 20040885612.2 ppb
2014-12-03DBP 2004088577.90 ppb
2014-12-04DBP 20040894610.4 ppb
2014-12-04DBP 2004089686.00 ppb
2014-12-04DBP 2004089696.50 ppb
2014-12-04DBP 2004089706.30 ppb
2015-03-02DBP 2004128514.50 ppb
2015-03-02DBP 2004128503.50 ppb
2015-03-03DBP 2004128834.90 ppb
2015-03-03DBP 2004128703.40 ppb
2015-03-03DBP 2004129283.70 ppb
2015-03-03DBP 2004129294.70 ppb
2015-03-03DBP 2004128633.00 ppb
2015-03-03VOC1 200412899ND
2015-03-03VOC1 200412902ND
2015-03-03VOC1 200412900ND
2015-03-03VOC1 2004128790.800 ppb
2015-03-03VOC1 2004128814.30 ppb
2015-03-03VOC1 2004129071.80 ppb
2015-03-03VOC1 200412923ND
2015-03-04DBP 2004130519.10 ppb
2015-03-04VOC1 2004130221.20 ppb
2015-03-05DBP 2004131307.30 ppb
2015-03-05DBP 2004131554.50 ppb
2015-03-05DBP 2004131543.90 ppb
2015-03-05DBP 2004131564.50 ppb
2015-03-10VOC1 200413328ND
2015-03-18VOC1 2004137131.80 ppb
2015-06-01DBP 2004175639.10 ppb
2015-06-01DBP 2004176024.60 ppb
2015-06-01DBP 2004176034.00 ppb
2015-06-01DBP 2004175954.70 ppb
2015-06-01DBP 2004176055.60 ppb
2015-06-01DBP 2004176044.70 ppb
2015-06-02DBP 2004176294.20 ppb
2015-06-02DBP 2004176994.60 ppb
2015-06-02DBP 2004176243.80 ppb
2015-06-02DBP 2004177014.60 ppb
2015-06-03DBP 2004178194.40 ppb
2015-06-03DBP 20041782310.3 ppb
2015-09-01DBP 20042382114.4 ppb
2015-09-01DBP 2004238124.20 ppb
2015-09-01DBP 2004238665.50 ppb
2015-09-01DBP 2004238294.60 ppb
2015-09-01DBP 2004238684.40 ppb
2015-09-01DBP 2004238676.00 ppb
2015-09-01DBP 2004238695.90 ppb
2015-09-01DBP 2004238074.20 ppb
2015-09-02DBP 2004240805.00 ppb
2015-09-02DBP 2004240815.70 ppb
2015-09-02DBP 2004240825.60 ppb
2015-09-04DBP 20042427117.1 ppb
2015-12-01DBP 2004295414.30 ppb
2015-12-01DBP 2004296045.00 ppb
2015-12-01DBP 2004295465.10 ppb
2015-12-01DBP 2004295565.00 ppb
2015-12-01DBP 2004296026.80 ppb
2015-12-01DBP 2004296016.50 ppb
2015-12-02DBP 20042972511.2 ppb
2015-12-02DBP 20042975112.4 ppb
2015-12-02DBP 2004297525.90 ppb
2015-12-03DBP 2004298755.00 ppb
2015-12-03DBP 2004298765.90 ppb
2015-12-03DBP 2004298776.30 ppb
2015-12-04VOC1 200429711ND
2016-02-29VOC1 2004343861.40 ppb
2016-02-29VOC1 2004343876.80 ppb
2016-02-29VOC1 2004343713.40 ppb
2016-02-29VOC1 2004343722.00 ppb
2016-03-01DBP 2004344204.70 ppb
2016-03-01DBP 2004344324.20 ppb
2016-03-01DBP 2004344394.70 ppb
2016-03-01DBP 2004345185.40 ppb
2016-03-01VOC1 2004344280.600 ppb
2016-03-01VOC1 200434431ND
2016-03-01VOC1 200434429ND
2016-03-01VOC1 200434430ND
2016-03-01VOC1 2004344741.30 ppb
2016-03-02DBP 2004346525.40 ppb
2016-03-02DBP 2004346536.00 ppb
2016-03-03DBP 20043470512.0 ppb
2016-03-03DBP 20043473413.3 ppb
2016-03-03DBP 2004347905.10 ppb
2016-03-03DBP 2004347916.60 ppb
2016-03-03VOC1 200434800ND
2016-03-04DBP 2004348195.70 ppb
2016-03-04DBP 2004348205.30 ppb
2016-06-01DBP 2004410254.60 ppb
2016-06-01DBP 2004410264.80 ppb
2016-06-01DBP 2004410374.90 ppb
2016-06-01DBP 2004410545.80 ppb
2016-06-01DBP 2004410555.50 ppb
2016-06-01DBP 2004410564.10 ppb
2016-06-01DBP 20044105715.1 ppb
2016-06-01DBP 2004410584.80 ppb
2016-06-02DBP 20044126212.3 ppb
2016-06-02DBP 2004412976.00 ppb
2016-06-02DBP 2004412985.90 ppb
2016-06-02DBP 2004412995.60 ppb
2016-09-06DBP 2004489697.80 ppb
2016-09-06DBP 2004489748.10 ppb
2016-09-06DBP 2004490017.60 ppb
2016-09-06DBP 2004490146.50 ppb
2016-09-06DBP 2004490159.10 ppb
2016-09-06DBP 2004490168.70 ppb
2016-09-07DBP 20044921410.4 ppb
2016-09-08DBP 2004494078.30 ppb
2016-09-08DBP 2004494088.50 ppb
2016-09-09DBP 2004495006.90 ppb
2016-09-12DBP 20044954520.6 ppb
2016-09-12DBP 20044954724.6 ppb
2016-12-05DBP 2004560815.00 ppb
2016-12-05DBP 2004560836.80 ppb
2016-12-06DBP 2004560887.00 ppb
2016-12-06DBP 2004561105.90 ppb
2016-12-06DBP 2004561156.30 ppb
2016-12-06DBP 2004561756.50 ppb
2016-12-07DBP 2004563584.90 ppb
2016-12-07DBP 2004563597.40 ppb
2016-12-08DBP 2004564530.800 ppb
2016-12-08DBP 2004564608.10 ppb
2016-12-08DBP 2004564617.80 ppb
2016-12-08DBP 2004564628.40 ppb
2017-02-27VOC1 2004613161.80 ppb
2017-02-27VOC1 2004613172.80 ppb
2017-02-27VOC1 2004613013.50 ppb
2017-02-28VOC1 200461369ND
2017-02-28VOC1 200461372ND
2017-02-28VOC1 200461370ND
2017-02-28VOC1 200461371ND
2017-02-28VOC1 2004614052.00 ppb
2017-02-28VOC1 200461407ND
2017-03-01DBP 2004614965.00 ppb
2017-03-01DBP 2004615425.20 ppb
2017-03-01DBP 2004615435.60 ppb
2017-03-01DBP 2004615445.60 ppb
2017-03-01DBP 2004615456.00 ppb
2017-03-01DBP 2004615466.50 ppb
2017-03-02DBP 2004616504.90 ppb
2017-03-02DBP 2004616515.40 ppb
2017-03-02DBP 2004616736.80 ppb
2017-03-02DBP 2004616746.50 ppb
2017-03-02DBP 2004616756.10 ppb
2017-03-02VOC1 200461633ND
2017-03-03DBP 2004617275.20 ppb
2017-06-05DBP 2004684205.20 ppb
2017-06-05DBP 2004684216.80 ppb
2017-06-06DBP 2004684765.40 ppb
2017-06-06DBP 2004684815.60 ppb
2017-06-06DBP 2004685006.40 ppb
2017-06-07DBP 2004686699.30 ppb
2017-06-07DBP 2004686706.00 ppb
2017-06-08DBP 2004688508.00 ppb
2017-06-08DBP 2004689466.80 ppb
2017-06-08DBP 2004689476.90 ppb
2017-06-08DBP 2004689486.30 ppb
2017-06-08DBP 2004689498.30 ppb
2017-06-19VOC1 2004696872.40 ppb
2017-06-19VOC1 200469688ND
2017-09-05DBP 2004757856.70 ppb
2017-09-05DBP 2004757906.60 ppb
2017-09-05DBP 2004758007.90 ppb
2017-09-07DBP 20047610415.0 ppb
2017-09-07DBP 2004762209.30 ppb
2017-09-07DBP 2004762218.40 ppb
2017-09-07DBP 2004762229.00 ppb
2017-09-07DBP 20047622411.5 ppb
2017-09-08DBP 2004763029.90 ppb
2017-09-08DBP 20047630410.00 ppb
2017-09-08DBP 2004763057.00 ppb
2017-09-08DBP 20047630615.0 ppb
2017-12-05DBP 2004833765.90 ppb
2017-12-05DBP 2004833816.50 ppb
2017-12-05DBP 2004833917.30 ppb
2017-12-07DBP 2004837706.80 ppb
2017-12-07DBP 2004837717.40 ppb
2017-12-07DBP 2004837726.70 ppb
2017-12-07DBP 20048377312.4 ppb
2017-12-07DBP 2004837746.80 ppb
2017-12-08DBP 20048383410.5 ppb
2017-12-08DBP 2004838437.70 ppb
2017-12-08DBP 2004838447.80 ppb
2017-12-08DBP 2004838457.80 ppb
2018-03-05VOC1 200489156ND
2018-03-05VOC1 2004891282.30 ppb
2018-03-05VOC1 2004891296.20 ppb
2018-03-05VOC1 2004891502.80 ppb
2018-03-06DBP 2004892686.20 ppb
2018-03-06DBP 2004892756.00 ppb
2018-03-06DBP 2004892876.80 ppb
2018-03-06VOC1 2004892950.600 ppb
2018-03-06VOC1 2004892980.600 ppb
2018-03-06VOC1 200489296ND
2018-03-07DBP 20048953713.8 ppb
2018-03-07DBP 2004895386.70 ppb
2018-03-07DBP 2004895398.20 ppb
2018-03-07DBP 2004895407.10 ppb
2018-03-07DBP 2004895416.60 ppb
2018-03-08DBP 20048956510.7 ppb
2018-03-09DBP 2004897017.70 ppb
2018-03-09DBP 2004897027.90 ppb
2018-03-09DBP 2004897035.30 ppb
2018-06-05DBP 2004959847.50 ppb
2018-06-05DBP 2004959897.70 ppb
2018-06-05DBP 2004960028.50 ppb
2018-06-06DBP 2004962358.00 ppb
2018-06-07DBP 2004963756.20 ppb
2018-06-07DBP 2004963767.40 ppb
2018-06-07DBP 20049641713.4 ppb
2018-06-08DBP 2004965078.90 ppb
2018-06-08DBP 2004965086.60 ppb
2018-06-08DBP 2004965098.50 ppb
2018-06-08DBP 2004965108.70 ppb
2018-06-08DBP 2004965117.70 ppb
2018-08-17VOC1 2005027353.60 ppb
2018-09-04DBP 2005037329.00 ppb
2018-09-04DBP 2005037379.30 ppb
2018-09-04DBP 2005038429.40 ppb
2018-09-04DBP 20050391210.1 ppb
2018-09-04DBP 2005039139.80 ppb
2018-09-04DBP 20050391410.00 ppb
2018-09-05DBP 2005039819.90 ppb
2018-09-05DBP 2005040868.80 ppb
2018-09-05DBP 20050408714.0 ppb
2018-09-06DBP 20050418516.0 ppb
2018-09-06DBP 20050421110.00 ppb
2018-09-07DBP 2005044419.40 ppb
2018-11-29VOC1 200514106ND
2018-11-29VOC1 2005141211.50 ppb
2018-12-03DBP 20051437212.2 ppb
2018-12-03DBP 2005144069.10 ppb
2018-12-04DBP 2005144478.50 ppb
2018-12-04DBP 2005144529.40 ppb
2018-12-04DBP 20051462511.3 ppb
2018-12-04DBP 20051462612.0 ppb
2018-12-04DBP 2005146278.90 ppb
2018-12-04DBP 2005146287.90 ppb
2018-12-04DBP 20051462910.4 ppb
2018-12-05DBP 2005149528.60 ppb
2018-12-06DBP 2005150697.60 ppb
2018-12-06DBP 2005150707.90 ppb
2019-03-04DBP 2005232155.50 ppb
2019-03-04DBP 2005232176.40 ppb
2019-03-04VOC1 2005231502.00 ppb
2019-03-04VOC1 2005231513.70 ppb
2019-03-04VOC1 2005231752.90 ppb
2019-03-04VOC1 2005231762.10 ppb
2019-03-05DBP 2005232625.90 ppb
2019-03-05DBP 2005232696.40 ppb
2019-03-05DBP 2005234566.20 ppb
2019-03-05DBP 2005234577.80 ppb
2019-03-05DBP 2005234586.70 ppb
2019-03-05DBP 2005234596.60 ppb
2019-03-05DBP 2005234639.20 ppb
2019-03-05VOC1 2005232510.700 ppb
2019-03-05VOC1 200523254ND
2019-03-05VOC1 200523252ND
2019-03-05VOC1 200523253ND
2019-03-05VOC1 2005232840.900 ppb
2019-03-05VOC1 200523286ND
2019-03-07DBP 2005238845.60 ppb
2019-03-08DBP 2005240005.40 ppb
2019-03-08DBP 2005240026.20 ppb
2019-05-08VOC1 200531298ND
2019-06-03DBP 2005343738.80 ppb
2019-06-03DBP 20053441414.1 ppb
2019-06-04DBP 2005344918.60 ppb
2019-06-04DBP 2005344968.80 ppb
2019-06-04DBP 2005346007.90 ppb
2019-06-04DBP 20053472513.0 ppb
2019-06-04DBP 2005347279.70 ppb
2019-06-04DBP 20053472910.5 ppb
2019-06-05DBP 20053503910.3 ppb
2019-06-05DBP 2005350418.50 ppb
2019-06-06DBP 2005351978.50 ppb
2019-06-07DBP 2005353579.50 ppb
2019-09-03DBP 20054698810.00 ppb
2019-09-03DBP 20054699311.6 ppb
2019-09-04DBP 20054740012.2 ppb
2019-09-04DBP 20054740210.9 ppb
2019-09-04DBP 20054740311.3 ppb
2019-09-04DBP 20054740411.1 ppb
2019-09-04DBP 2005474059.20 ppb
2019-09-05DBP 20054746018.0 ppb
2019-09-05DBP 20054766713.4 ppb
2019-09-06DBP 20054782611.0 ppb
2019-09-06DBP 20054782712.5 ppb
2019-09-06DBP 20054782810.8 ppb
2019-12-02DBP 2005584056.90 ppb
2019-12-02DBP 2005584067.80 ppb
2019-12-02DBP 2005584078.00 ppb
2019-12-03DBP 2005584546.90 ppb
2019-12-03DBP 2005584596.90 ppb
2019-12-03DBP 2005586127.30 ppb
2019-12-04DBP 2005589167.00 ppb
2019-12-04DBP 2005589177.90 ppb
2019-12-04DBP 2005589199.40 ppb
2019-12-05DBP 2005590738.00 ppb
2019-12-05DBP 2005590986.50 ppb
2019-12-06DBP 2005591956.60 ppb