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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

Madison Water Utility

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

 

247

Samples

0

Samples exceeding legal limit (MCL)

127

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.680 ppb4925ND - 4.10 ppb
20150.714 ppb4422ND - 4.30 ppb
20160.726 ppb2916ND - 3.40 ppb
20170.718 ppb5122ND - 4.20 ppb
20180.570 ppb4127ND - 3.10 ppb
20190.622 ppb3315ND - 4.70 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
2014-01-21767449ND
2014-01-217674480.260 ppb
2014-01-217674520.460 ppb
2014-01-217674380.650 ppb
2014-01-22767447ND
2014-01-22767443ND
2014-01-22767445ND
2014-01-227674870.330 ppb
2014-01-227674881.60 ppb
2014-01-227674462.10 ppb
2014-01-297682100.380 ppb
2014-02-14770975ND
2014-02-17770977ND
2014-02-187709730.500 ppb
2014-02-187709741.50 ppb
2014-02-187709721.90 ppb
2014-04-037782960.660 ppb
2014-04-04778295ND
2014-04-07778297ND
2014-04-077782980.220 ppb
2014-04-227820911.90 ppb
2014-04-227820903.60 ppb
2014-04-23782084ND
2014-04-23782085ND
2014-04-237820890.300 ppb
2014-04-237820870.340 ppb
2014-04-237820880.420 ppb
2014-05-05784135ND
2014-05-057841311.60 ppb
2014-07-14803099ND
2014-07-14803096ND
2014-07-14803098ND
2014-07-14803097ND
2014-07-148031000.610 ppb
2014-07-15803105ND
2014-07-15803102ND
2014-07-15803101ND
2014-07-158031033.40 ppb
2014-07-158031044.10 ppb
2014-08-04808191ND
2014-08-04808190ND
2014-08-048081920.460 ppb
2014-10-14825836ND
2014-10-14825835ND
2014-10-148258340.640 ppb
2014-10-148258372.20 ppb
2014-10-148258383.20 ppb
2014-10-15825840ND
2014-10-15825839ND
2015-01-20839968ND
2015-01-208399670.160 ppb
2015-01-208399721.40 ppb
2015-01-208399712.90 ppb
2015-02-23844761ND
2015-02-23844760ND
2015-02-23844745ND
2015-02-23844741ND
2015-02-23844763ND
2015-02-23844742ND
2015-02-238447440.290 ppb
2015-02-238447430.470 ppb
2015-02-238447640.720 ppb
2015-02-238447402.40 ppb
2015-03-10847889ND
2015-04-21855404ND
2015-04-21855403ND
2015-04-21855408ND
2015-04-21855402ND
2015-04-218554070.150 ppb
2015-04-218554060.470 ppb
2015-04-218554101.60 ppb
2015-04-218554092.30 ppb
2015-05-05858198ND
2015-05-05858197ND
2015-07-21872306ND
2015-07-21872301ND
2015-07-21872309ND
2015-07-21872300ND
2015-07-218723100.400 ppb
2015-07-218722980.540 ppb
2015-07-218723040.610 ppb
2015-07-218723080.940 ppb
2015-07-218722961.000 ppb
2015-07-218722993.00 ppb
2015-07-218723023.40 ppb
2015-07-22872696ND
2015-07-22872695ND
2015-10-19890002ND
2015-10-20890005ND
2015-10-208900070.280 ppb
2015-10-208900030.690 ppb
2015-10-208899993.40 ppb
2015-10-208900004.30 ppb
2016-01-199021450.960 ppb
2016-01-199021461.30 ppb
2016-01-20902152ND
2016-01-20902149ND
2016-01-20902157ND
2016-01-20902153ND
2016-01-20902150ND
2016-01-20902154ND
2016-01-209021510.400 ppb
2016-04-19916893ND
2016-04-19916888ND
2016-04-19916894ND
2016-04-199168910.650 ppb
2016-04-199168921.60 ppb
2016-04-199168892.30 ppb
2016-07-19934715ND
2016-07-19934717ND
2016-07-199347090.220 ppb
2016-07-199347050.380 ppb
2016-07-199347122.50 ppb
2016-07-199347142.60 ppb
2016-07-20935007ND
2016-08-249416200.480 ppb
2016-10-18954232ND
2016-10-189542290.390 ppb
2016-10-189542350.530 ppb
2016-10-189542330.640 ppb
2016-10-189542272.70 ppb
2016-10-189542283.40 ppb
2017-01-18970480ND
2017-01-18970485ND
2017-01-18970478ND
2017-01-189704840.460 ppb
2017-01-189704770.510 ppb
2017-01-189704820.770 ppb
2017-01-189704830.970 ppb
2017-01-24970986ND
2017-01-24970991ND
2017-01-24970992ND
2017-01-24970988ND
2017-01-24970990ND
2017-01-249709841.30 ppb
2017-01-249709852.20 ppb
2017-01-249709873.20 ppb
2017-02-16974146ND
2017-04-18984277ND
2017-04-18984283ND
2017-04-189842780.230 ppb
2017-04-189842870.900 ppb
2017-04-189842882.40 ppb
2017-04-189842893.90 ppb
2017-04-19984286ND
2017-04-19984284ND
2017-04-19984285ND
2017-04-19984282ND
2017-04-19984279ND
2017-04-19984276ND
2017-04-199842900.380 ppb
2017-07-171004640ND
2017-07-171004639ND
2017-07-171004637ND
2017-07-1710046381.20 ppb
2017-07-181004645ND
2017-07-181004646ND
2017-07-181004642ND
2017-07-1810046440.530 ppb
2017-07-1810046410.670 ppb
2017-07-1810046431.000 ppb
2017-07-1810046843.00 ppb
2017-07-1810046853.70 ppb
2017-08-1410109390.820 ppb
2017-10-161024784ND
2017-10-161024785ND
2017-10-161024788ND
2017-10-161024787ND
2017-10-161024783ND
2017-10-1610247822.00 ppb
2017-10-1710247012.30 ppb
2017-10-1710247004.20 ppb
2017-12-191034398ND
2018-01-161037644ND
2018-01-161037645ND
2018-01-161037642ND
2018-01-161037643ND
2018-01-161037640ND
2018-01-161037647ND
2018-01-1610376381.30 ppb
2018-01-1710376480.270 ppb
2018-01-1710376500.980 ppb
2018-01-1710376492.20 ppb
2018-03-1310449350.680 ppb
2018-04-1639178340.200 ppb
2018-04-1639178370.200 ppb
2018-04-1639178390.300 ppb
2018-04-1739178360.200 ppb
2018-04-1739178380.300 ppb
2018-04-1739178350.600 ppb
2018-04-173914791-921.30 ppb
2018-04-173914789-902.40 ppb
2018-07-173992318ND
2018-07-1739923160.1000 ppb
2018-07-1739923150.200 ppb
2018-07-1739923190.200 ppb
2018-07-1739923170.200 ppb
2018-07-1739923200.300 ppb
2018-07-1739923100.700 ppb
2018-07-173991853-541.90 ppb
2018-07-173991851-523.10 ppb
2018-08-0940180810.200 ppb
2018-09-111079446ND
2018-09-111079449ND
2018-09-1110794520.450 ppb
2018-10-164091676ND
2018-10-164091677ND
2018-10-164091675ND
2018-10-1640916780.200 ppb
2018-10-164091548-491.10 ppb
2018-10-164091546-472.90 ppb
2018-10-174093738ND
2018-10-174093740ND
2018-10-1740937390.900 ppb
2019-01-161101627ND
2019-01-1611016230.690 ppb
2019-01-1611016930.890 ppb
2019-01-1611016922.60 ppb
2019-03-111109100ND
2019-03-111109102ND
2019-03-111109101ND
2019-03-111109103ND
2019-04-161115411ND
2019-04-161115494ND
2019-04-161115486ND
2019-04-161115492ND
2019-04-161115484ND
2019-04-1611154140.550 ppb
2019-04-1611155550.580 ppb
2019-04-1611155562.20 ppb
2019-07-151134797ND
2019-07-151134799ND
2019-07-151134798ND
2019-07-151134800ND
2019-07-1511348010.260 ppb
2019-07-1611348020.710 ppb
2019-07-1611347610.770 ppb
2019-07-1611348031.000 ppb
2019-07-1611347604.70 ppb
2019-07-181135762ND
2019-10-141155276ND
2019-10-141155275ND
2019-10-1411552720.290 ppb
2019-10-151155274ND
2019-10-1511552731.10 ppb
2019-10-1511552801.40 ppb
2019-10-1511552792.80 ppb