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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

Dover Water Commission

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

 

144

Samples

0

Samples exceeding legal limit (MCL)

101

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.01 ppb2416ND - 2.84 ppb
20151.16 ppb2418ND - 3.67 ppb
20161.11 ppb2416ND - 2.88 ppb
20171.25 ppb2417ND - 3.13 ppb
20181.18 ppb2417ND - 3.87 ppb
20190.821 ppb2417ND - 2.04 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
2014-01-1525051-41.09 ppb
2014-01-1525051-30.730 ppb
2014-01-1525051-21.09 ppb
2014-01-1525051-11.12 ppb
2014-03-0525734-2AND
2014-03-0525734-1AND
2014-04-1626316-41.33 ppb
2014-04-1626316-32.76 ppb
2014-04-1626316-21.11 ppb
2014-04-1626316-11.57 ppb
2014-06-1827310-2ND
2014-06-1827310-1ND
2014-07-1627840-42.45 ppb
2014-07-1627840-32.84 ppb
2014-07-1627840-21.25 ppb
2014-07-1627840-12.49 ppb
2014-09-2629140-2BND
2014-09-2629140-1BND
2014-10-1629456-40.610 ppb
2014-10-1629456-32.54 ppb
2014-10-1629456-20.650 ppb
2014-10-1629456-10.700 ppb
2014-12-1030311-17ND
2014-12-1030311-16ND
2015-01-1530804-40.760 ppb
2015-01-1530804-32.09 ppb
2015-01-1530804-20.780 ppb
2015-01-1530804-10.890 ppb
2015-01-2930990-2ND
2015-01-2930990-1ND
2015-04-16DWS242-40.770 ppb
2015-04-16DWS242-31.55 ppb
2015-04-16DWS242-20.920 ppb
2015-04-16DWS242-11.51 ppb
2015-04-16DWS243-2ND
2015-04-16DWS243-1ND
2015-07-14DWS1151-42.07 ppb
2015-07-14DWS1151-33.07 ppb
2015-07-14DWS1151-21.18 ppb
2015-07-14DWS1151-13.67 ppb
2015-09-10DWS1518-2AND
2015-09-10DWS1518-1A0.610 ppb
2015-10-15DWS1754-31.18 ppb
2015-10-15DWS1754-22.90 ppb
2015-10-15DWS1754-11.57 ppb
2015-10-21DWS1794-11.49 ppb
2015-11-18DWS1964-2ND
2015-11-18DWS1964-10.740 ppb
2016-01-20DWS2269-2ND
2016-01-20DWS2269-1ND
2016-01-22DWS2284-40.750 ppb
2016-01-22DWS2284-31.78 ppb
2016-01-22DWS2284-21.52 ppb
2016-01-22DWS2284-11.51 ppb
2016-04-15DWS2805-40.820 ppb
2016-04-15DWS2805-31.47 ppb
2016-04-15DWS2805-21.11 ppb
2016-04-15DWS2805-10.700 ppb
2016-04-20DWS2860-2AND
2016-04-20DWS2860-1AND
2016-07-11DWS3345-2ND
2016-07-11DWS3345-1ND
2016-07-20DWS3396-41.52 ppb
2016-07-20DWS3396-30.920 ppb
2016-07-20DWS3396-21.77 ppb
2016-07-20DWS3396-12.88 ppb
2016-10-12DWS3996-42.28 ppb
2016-10-12DWS3996-32.72 ppb
2016-10-12DWS3996-22.52 ppb
2016-10-12DWS3996-12.35 ppb
2016-12-09DWS4357-2AND
2016-12-09DWS4357-1AND
2017-01-20DWS4623-40.840 ppb
2017-01-20DWS4623-31.21 ppb
2017-01-20DWS4623-21.17 ppb
2017-01-20DWS4623-11.06 ppb
2017-03-02DWS4896-2AND
2017-03-02DWS4896-1AND
2017-04-28DWS5304-42.62 ppb
2017-04-28DWS5304-33.08 ppb
2017-04-28DWS5304-23.13 ppb
2017-04-28DWS5304-12.49 ppb
2017-05-02DWS5334-2ND
2017-05-02DWS5334-1ND
2017-07-17DWS5949-41.55 ppb
2017-07-17DWS5949-32.52 ppb
2017-07-17DWS5949-21.40 ppb
2017-07-17DWS5949-12.69 ppb
2017-07-31DWS6081-2ND
2017-07-31DWS6081-1ND
2017-10-06DWS6722-2ND
2017-10-06DWS6722-10.560 ppb
2017-10-16DWS6821-41.28 ppb
2017-10-16DWS6821-31.53 ppb
2017-10-16DWS6821-21.50 ppb
2017-10-16DWS6821-11.35 ppb
2018-01-16DWS7566-40.850 ppb
2018-01-16DWS7566-31.20 ppb
2018-01-16DWS7566-21.59 ppb
2018-01-16DWS7566-11.02 ppb
2018-02-02DWS7708-2AND
2018-02-02DWS7708-1AND
2018-04-16DWS8383-41.62 ppb
2018-04-16DWS8383-31.51 ppb
2018-04-16DWS8383-21.89 ppb
2018-04-16DWS8383-13.87 ppb
2018-04-26DWS8495-1ND
2018-04-26DWS8494-10.650 ppb
2018-07-0618070509-02ND
2018-07-0618070509-01ND
2018-07-1618071320-041.45 ppb
2018-07-1618071320-031.59 ppb
2018-07-1618071320-021.96 ppb
2018-07-1618071320-011.74 ppb
2018-10-1618101510-041.24 ppb
2018-10-1618101510-032.15 ppb
2018-10-1618101510-021.95 ppb
2018-10-1618101510-012.06 ppb
2018-11-0218110119-02ND
2018-11-0218110119-01ND
2019-01-0919010837-020.570 ppb
2019-01-0919010837-01ND
2019-01-1519011412-041.36 ppb
2019-01-1519011412-031.67 ppb
2019-01-1519011412-022.04 ppb
2019-01-1519011412-010.960 ppb
2019-04-1719041618-041.18 ppb
2019-04-1719041618-031.73 ppb
2019-04-1719041618-021.67 ppb
2019-04-1719041618-011.31 ppb
2019-04-1719041620-02ND
2019-04-1719041620-01ND
2019-07-0519070333-002ND
2019-07-0519070333-0010.560 ppb
2019-07-1519071230-004ND
2019-07-1519071230-0030.700 ppb
2019-07-1519071230-002ND
2019-07-1519071230-0010.780 ppb
2019-10-1719101609-0041.01 ppb
2019-10-1719101609-0031.29 ppb
2019-10-1719101609-0021.41 ppb
2019-10-1719101609-0010.910 ppb
2019-11-0119103136-002ND
2019-11-0119103136-0010.560 ppb