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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Lake St. John Waterworks District 1

Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform 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

 

96

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
2015ND160ND
2016ND160ND
2017ND160ND
2018ND160ND
2019ND160ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for bromoform 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
2014-03-191286870ND
2014-03-191286869ND
2014-03-191286870ND
2014-03-191286869ND
2014-06-181311307ND
2014-06-181311308ND
2014-06-181311308ND
2014-06-181311307ND
2014-09-171336426ND
2014-09-171336427ND
2014-09-171336427ND
2014-09-171336426ND
2014-12-161358963ND
2014-12-161358964ND
2014-12-161358964ND
2014-12-161358963ND
2015-03-181380990ND
2015-03-181380991ND
2015-03-181380991ND
2015-03-181380990ND
2015-06-171405012ND
2015-06-171405013ND
2015-06-171405013ND
2015-06-171405012ND
2015-09-161428328ND
2015-09-161428327ND
2015-09-161428328ND
2015-09-161428327ND
2015-12-161452166ND
2015-12-161452167ND
2015-12-161452167ND
2015-12-161452166ND
2016-03-151475113ND
2016-03-151475114ND
2016-03-151475114ND
2016-03-151475113ND
2016-06-131499803ND
2016-06-131499802ND
2016-06-131499803ND
2016-06-131499802ND
2016-09-2835268083001ND
2016-09-2835268083002ND
2016-09-2835268083002ND
2016-09-2835268083001ND
2016-12-1635286276001ND
2016-12-1635286276002ND
2016-12-1635286276002ND
2016-12-1635286276001ND
2017-03-0835300072002ND
2017-03-0835300072001ND
2017-03-0835300072001ND
2017-03-0835300072002ND
2017-06-0735317131010ND
2017-06-0735317131010ND
2017-06-0735317131011ND
2017-06-0735317131011ND
2017-09-1335335703012ND
2017-09-1335335703013ND
2017-09-1335335703012ND
2017-09-1335335703013ND
2017-12-2035364962002ND
2017-12-2035364962001ND
2017-12-2035364962001ND
2017-12-2035364962002ND
2018-03-2635382605002ND
2018-03-2635382605001ND
2018-03-2635382605002ND
2018-03-2635382605001ND
2018-06-0635397137002ND
2018-06-0635397137002ND
2018-06-0635397137001ND
2018-06-0635397137001ND
2018-09-1935419439002ND
2018-09-1935419439001ND
2018-09-1935419439001ND
2018-09-1935419439002ND
2018-12-1235437260001ND
2018-12-1235437260002ND
2018-12-1235437260001ND
2018-12-1235437260002ND
2019-03-1835456309002ND
2019-03-1835456309001ND
2019-03-1835456309001ND
2019-03-1835456309002ND
2019-06-1935477111002ND
2019-06-1935477111002ND
2019-06-1935477111001ND
2019-06-1935477111001ND
2019-09-1635498598002ND
2019-09-1635498598001ND
2019-09-1635498598001ND
2019-09-1635498598002ND
2019-12-1035518270001ND
2019-12-1035518270002ND
2019-12-1035518270001ND
2019-12-1035518270002ND