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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

City of Richmond

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

 

61

Samples

0

Samples exceeding legal limit (MCL)

60

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.60 ppb111.60 ppb
20151.70 ppb990.800 ppb - 4.40 ppb
20161.32 ppb13130.500 ppb - 3.60 ppb
20171.45 ppb17170.500 ppb - 2.70 ppb
20181.00 ppb98ND - 1.60 ppb
20191.18 ppb12120.530 ppb - 1.60 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
2014-08-28E1402000221.60 ppb
2015-05-28VA010-DCLS0.800 ppb
2015-07-07460260-EUROFINS0.940 ppb
2015-07-07460260-EUROFINS1.20 ppb
2015-07-07460260-EUROFINS1.30 ppb
2015-07-07460260-EUROFINS1.70 ppb
2015-10-05460260-EUROFINS1.60 ppb
2015-10-05460260-EUROFINS1.60 ppb
2015-10-05460260-EUROFINS1.80 ppb
2015-10-05460260-EUROFINS4.40 ppb
2016-04-04201604060591TTHM0.640 ppb
2016-04-04201604060594TTHM0.650 ppb
2016-04-04201604060592TTHM0.660 ppb
2016-04-04201604060593TTHM0.690 ppb
2016-04-05E1602036370.500 ppb
2016-07-11201607130422TTHM1.000 ppb
2016-07-11201607130424TTHM1.10 ppb
2016-07-11201607130421TTHM1.10 ppb
2016-07-11206107130423TTHM1.20 ppb
2016-10-03201610050135TTHM3.60 ppb
2016-10-03201610050136TTHM2.90 ppb
2016-10-03201610050137TTHM2.00 ppb
2016-10-03201610050134TTHM1.10 ppb
2017-01-11201701130609TTHM1.60 ppb
2017-01-11201701130611TTHM1.90 ppb
2017-01-11201701130608TTHM0.820 ppb
2017-01-11201701130610TTHM1.000 ppb
2017-04-10201704112287TTHM0.500 ppb
2017-04-10201704112289TTHM1.20 ppb
2017-04-10201704112288TTHM0.630 ppb
2017-04-10201704112286TTHM0.770 ppb
2017-04-18E1704011430.600 ppb
2017-07-10201707121224TTHM1.30 ppb
2017-07-10201707121227TTHM1.40 ppb
2017-07-10201707121225TTHM1.40 ppb
2017-07-10201707121226TTHM1.50 ppb
2017-10-03201710050250TTHM2.50 ppb
2017-10-03201710050251TTHM2.70 ppb
2017-10-03201710050249TTHM2.50 ppb
2017-10-03201710050248TTHM2.30 ppb
2018-01-12201801130179TTHM1.60 ppb
2018-01-12201801130178TTHM0.990 ppb
2018-01-12201801130177TTHM1.60 ppb
2018-01-12201801130176TTHM1.60 ppb
2018-04-09E180303211ND
2018-07-02201807031058TTHM0.870 ppb
2018-07-02201807031057TTHM0.830 ppb
2018-07-02201807031055TTHM0.890 ppb
2018-07-02201807031056TTHM0.640 ppb
2019-04-02201904030489TTHM0.580 ppb
2019-04-02201904030491TTHM0.530 ppb
2019-04-02201904030492TTHM0.550 ppb
2019-06-27E1904033740.700 ppb
2019-07-10201907120200TTHM1.40 ppb
2019-07-10201907120202TTHM1.30 ppb
2019-07-10201907120201TTHM1.40 ppb
2019-07-10201907120199TTHM1.30 ppb
2019-10-08201910100024TTHM1.60 ppb
2019-10-08201910100023TTHM1.60 ppb
2019-10-08201910100022TTHM1.60 ppb
2019-10-08201910100021TTHM1.60 ppb