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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

St John Water District 1

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

 

218

Samples

0

Samples exceeding legal limit (MCL)

192

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201418.6 ppb5848ND - 51.1 ppb
201517.6 ppb323211.3 ppb - 25.6 ppb
201613.9 ppb3230ND - 26.5 ppb
201715.7 ppb3228ND - 22.0 ppb
201816.0 ppb32326.00 ppb - 28.3 ppb
201910.6 ppb3222ND - 25.9 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
2014-01-22AD884996.17 ppb
2014-01-22AD884996.17 ppb
2014-03-05201168804ND
2014-03-05201168805ND
2014-03-052011688068.70 ppb
2014-03-052011688088.40 ppb
2014-03-052011688098.80 ppb
2014-03-052011688109.40 ppb
2014-03-052011688119.20 ppb
2014-03-0520119880710.2 ppb
2014-03-05201168804ND
2014-03-05201168805ND
2014-03-052011688068.70 ppb
2014-03-052011688088.40 ppb
2014-03-052011688098.80 ppb
2014-03-052011688109.40 ppb
2014-03-052011688119.20 ppb
2014-03-0520119880710.2 ppb
2014-06-0420474300115.1 ppb
2014-06-0420474300213.0 ppb
2014-06-0420474300313.7 ppb
2014-06-0420474300414.0 ppb
2014-06-04204746001ND
2014-06-04204746002ND
2014-06-0420474600314.1 ppb
2014-06-04204746004ND
2014-06-0420474300115.1 ppb
2014-06-0420474300213.0 ppb
2014-06-0420474300313.7 ppb
2014-06-0420474300414.0 ppb
2014-06-04204746001ND
2014-06-04204746002ND
2014-06-0420474600314.1 ppb
2014-06-04204746004ND
2014-08-2720860100118.8 ppb
2014-08-2720860100220.6 ppb
2014-08-2720860100321.7 ppb
2014-08-2720860100418.6 ppb
2014-08-2720860100118.8 ppb
2014-08-2720860100220.6 ppb
2014-08-2720860100321.7 ppb
2014-08-2720860100418.6 ppb
2014-09-1820957300146.2 ppb
2014-09-1820957300245.6 ppb
2014-09-1820957300351.1 ppb
2014-09-1820957300446.9 ppb
2014-09-1820957300146.2 ppb
2014-09-1820957300245.6 ppb
2014-09-1820957300351.1 ppb
2014-09-1820957300446.9 ppb
2014-12-10201352600134.2 ppb
2014-12-10201352600236.4 ppb
2014-12-10201352600336.7 ppb
2014-12-10201352600433.1 ppb
2014-12-10201352600134.2 ppb
2014-12-10201352600236.4 ppb
2014-12-10201352600336.7 ppb
2014-12-10201352600433.1 ppb
2015-03-05201673600111.3 ppb
2015-03-05201673600212.2 ppb
2015-03-05201673600311.6 ppb
2015-03-05206173600411.9 ppb
2015-03-05201673600111.3 ppb
2015-03-05201673600212.2 ppb
2015-03-05201673600311.6 ppb
2015-03-05206173600411.9 ppb
2015-06-04202089300120.9 ppb
2015-06-04202089300219.9 ppb
2015-06-04202089300319.8 ppb
2015-06-04202089300417.0 ppb
2015-06-04202089300120.9 ppb
2015-06-04202089300219.9 ppb
2015-06-04202089300319.8 ppb
2015-06-04202089300417.0 ppb
2015-09-02202509600124.2 ppb
2015-09-02202509600224.8 ppb
2015-09-02202509600325.6 ppb
2015-09-02202509600424.7 ppb
2015-09-02202509600124.2 ppb
2015-09-02202509600224.8 ppb
2015-09-02202509600325.6 ppb
2015-09-02202509600424.7 ppb
2015-12-09202982800113.2 ppb
2015-12-09202982800215.1 ppb
2015-12-09202982800314.6 ppb
2015-12-09202982800414.3 ppb
2015-12-09202982800113.2 ppb
2015-12-09202982800215.1 ppb
2015-12-09202982800314.6 ppb
2015-12-09202982800414.3 ppb
2016-03-0720335120016.20 ppb
2016-03-0720335120027.50 ppb
2016-03-0720335120036.20 ppb
2016-03-0720335120046.50 ppb
2016-03-0720335120016.20 ppb
2016-03-0720335120027.50 ppb
2016-03-0720335120036.20 ppb
2016-03-0720335120046.50 ppb
2016-06-08203792600116.8 ppb
2016-06-08203792600217.2 ppb
2016-06-08203792600318.3 ppb
2016-06-08203792600417.3 ppb
2016-06-08203792600116.8 ppb
2016-06-08203792600217.2 ppb
2016-06-08203792600318.3 ppb
2016-06-08203792600417.3 ppb
2016-09-1420426760010.560 ppb
2016-09-14204267600226.5 ppb
2016-09-14204267600323.2 ppb
2016-09-142042676004ND
2016-09-1420426760010.560 ppb
2016-09-14204267600226.5 ppb
2016-09-14204267600323.2 ppb
2016-09-142042676004ND
2016-12-07204703700119.5 ppb
2016-12-07204705100120.3 ppb
2016-12-07204705600116.5 ppb
2016-12-07204705800119.7 ppb
2016-12-07204703700119.5 ppb
2016-12-07204705100120.3 ppb
2016-12-07204705600116.5 ppb
2016-12-07204705800119.7 ppb
2017-03-103530015300118.4 ppb
2017-03-103530015300217.8 ppb
2017-03-103530015300318.3 ppb
2017-03-1035300153004ND
2017-03-103530015300118.4 ppb
2017-03-103530015300217.8 ppb
2017-03-103530015300318.3 ppb
2017-03-1035300153004ND
2017-06-223532023100915.4 ppb
2017-06-223532023101017.7 ppb
2017-06-223532023101114.5 ppb
2017-06-223532023101214.8 ppb
2017-06-223532023100915.4 ppb
2017-06-223532023101017.7 ppb
2017-06-223532023101114.5 ppb
2017-06-223532023101214.8 ppb
2017-09-213533739500122.0 ppb
2017-09-213533739500220.4 ppb
2017-09-213533739500321.9 ppb
2017-09-2135337395004ND
2017-09-213533739500122.0 ppb
2017-09-213533739500220.4 ppb
2017-09-213533739500321.9 ppb
2017-09-2135337395004ND
2017-12-143536355000116.8 ppb
2017-12-143536355000221.4 ppb
2017-12-143536355000315.7 ppb
2017-12-143536355000415.4 ppb
2017-12-143536355000116.8 ppb
2017-12-143536355000221.4 ppb
2017-12-143536355000315.7 ppb
2017-12-143536355000415.4 ppb
2018-03-15353805400016.00 ppb
2018-03-15353805400027.60 ppb
2018-03-15353805400037.60 ppb
2018-03-15353805400046.40 ppb
2018-03-15353805400016.00 ppb
2018-03-15353805400027.60 ppb
2018-03-15353805400037.60 ppb
2018-03-15353805400046.40 ppb
2018-06-143539865200119.0 ppb
2018-06-143539865200216.3 ppb
2018-06-143539865200318.8 ppb
2018-06-143539865200418.9 ppb
2018-06-143539865200119.0 ppb
2018-06-143539865200216.3 ppb
2018-06-143539865200318.8 ppb
2018-06-143539865200418.9 ppb
2018-09-063541614300128.3 ppb
2018-09-063541614300226.3 ppb
2018-09-063541614300326.7 ppb
2018-09-063541614300425.3 ppb
2018-09-063541614300128.3 ppb
2018-09-063541614300226.3 ppb
2018-09-063541614300326.7 ppb
2018-09-063541614300425.3 ppb
2018-12-103543635700111.5 ppb
2018-12-103543635700212.2 ppb
2018-12-103543635700313.0 ppb
2018-12-103543635700411.8 ppb
2018-12-103543635700111.5 ppb
2018-12-103543635700212.2 ppb
2018-12-103543635700313.0 ppb
2018-12-103543635700411.8 ppb
2019-03-13354545570016.70 ppb
2019-03-13354545570026.90 ppb
2019-03-13354545570036.50 ppb
2019-03-1335454557004ND
2019-03-13354545570016.70 ppb
2019-03-13354545570026.90 ppb
2019-03-13354545570036.50 ppb
2019-03-1335454557004ND
2019-06-113547528800111.8 ppb
2019-06-1135475288002ND
2019-06-113547528800311.8 ppb
2019-06-1135475288004ND
2019-06-113547528800111.8 ppb
2019-06-1135475288002ND
2019-06-113547528800311.8 ppb
2019-06-1135475288004ND
2019-09-123549758900123.7 ppb
2019-09-123549758900225.9 ppb
2019-09-123549758900324.6 ppb
2019-09-123549758900425.3 ppb
2019-09-123549758900123.7 ppb
2019-09-123549758900225.9 ppb
2019-09-123549758900324.6 ppb
2019-09-123549758900425.3 ppb
2019-12-093551759100112.8 ppb
2019-12-0935517591002ND
2019-12-093551759100313.4 ppb
2019-12-0935517591004ND
2019-12-093551759100112.8 ppb
2019-12-0935517591002ND
2019-12-093551759100313.4 ppb
2019-12-0935517591004ND