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EWG's Tap Water Database

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Bromoform

Watertown City

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.

 

142

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2010ND160ND
2011ND120ND
2012ND160ND
2013ND160ND
2014ND340ND
2015ND480ND

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 0.5 ppb

The 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.

EPA Maximum Contaminant
Level Goal (MCLG)0 ppb

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppb = parts per billion.

All test results

Date Lab ID Result
2010-02-111002459-003ND
2010-02-111002459-001ND
2010-02-111002459-004ND
2010-02-111002459-002ND
2010-05-131007613-004ND
2010-05-131007613-003ND
2010-05-131007613-001ND
2010-05-131007613-002ND
2010-08-131013847-003ND
2010-08-131013847-004ND
2010-08-131013847-001ND
2010-08-131013847-002ND
2010-11-09101957-001ND
2010-11-091019574-003ND
2010-11-091019574-002ND
2010-11-091019574-004ND
2011-05-111106553-001ND
2011-05-111106553-002ND
2011-05-111106553-004ND
2011-05-111106553-003ND
2011-08-031112110-003ND
2011-08-031112110-004ND
2011-08-031112110-002ND
2011-08-031112110-001ND
2011-11-141118448-001ND
2011-11-141118448-003ND
2011-11-141118448-002ND
2011-11-141118448-004ND
2012-02-221202714-004ND
2012-02-221202714-003ND
2012-02-221202714-002ND
2012-02-221202714-001ND
2012-05-021206534-003ND
2012-05-021206534-001ND
2012-05-021206534-004ND
2012-05-021026534-002ND
2012-08-011212371-002ND
2012-08-011212371-009ND
2012-08-011212371-006ND
2012-08-011212371-010ND
2012-11-071218302-006ND
2012-11-071218302-009ND
2012-11-071218302-010ND
2012-11-071218302-002ND
2013-02-061301770-007ND
2013-02-061301770-006ND
2013-02-061301770-008ND
2013-02-061301770-002ND
2013-05-08MRT0031 DBP 2QTR13ND
2013-05-08DS00014 DBP 2QTR13ND
2013-05-08DS00026 DBP 2QTR13ND
2013-05-08DS00015 2QTR2013ND
2013-08-061313147-004ND
2013-08-061313147-003ND
2013-08-071313147-002ND
2013-08-081313147-001ND
2013-11-061318290-012ND
2013-11-061318290-011ND
2013-11-061318290-007ND
2013-11-061318290-010ND
2014-02-051401657-012ND
2014-02-051401657-011ND
2014-02-051401657-010ND
2014-02-051401657-007ND
2014-02-051401657-013ND
2014-04-021404398-009ND
2014-05-071406257-011ND
2014-05-071406257-012ND
2014-05-071406257-001ND
2014-05-071406257-004ND
2014-07-161410755-011ND
2014-07-161410755-012ND
2014-07-161410755-010ND
2014-07-161410755-007ND
2014-08-061412351-007ND
2014-08-061412351-012ND
2014-08-061412351-011ND
2014-08-061412351-010ND
2014-09-101414832-009ND
2014-09-101414832-011ND
2014-09-101414832-008ND
2014-09-101414832-012ND
2014-10-081416618-012ND
2014-10-081416618-010ND
2014-10-081416618-011ND
2014-10-081416618-007ND
2014-11-051418303-010ND
2014-11-051418303-007ND
2014-11-051418303-011ND
2014-11-051418303-012ND
2014-12-031419724-012ND
2014-12-031419724-011ND
2014-12-031419724-008ND
2014-12-031419724-009ND
2015-01-141500772-010ND
2015-01-141500772-012ND
2015-01-151500772-011ND
2015-01-151500772-007ND
2015-02-041501522-011ND
2015-02-041501522-008ND
2015-02-041501522-012ND
2015-02-041501522-009ND
2015-03-041502825-010ND
2015-03-041502825-011ND
2015-03-041502825-012ND
2015-03-041502825-007ND
2015-04-081504564-012ND
2015-04-081504564-010ND
2015-04-081504564-011ND
2015-04-081504564-007ND
2015-05-061506084-012ND
2015-05-061506084-010ND
2015-05-061506084-007ND
2015-05-061506084-011ND
2015-06-031507791-012ND
2015-06-031507791-010ND
2015-06-031507791-011ND
2015-06-031507791-007ND
2015-07-081510103-011ND
2015-07-081510103-012ND
2015-07-081510103-010ND
2015-07-081510103-007ND
2015-08-051511980-012ND
2015-08-051511980-011ND
2015-08-051511980-007ND
2015-08-051511980-010ND
2015-09-091514301-010ND
2015-09-091514301-012ND
2015-09-091514301-011ND
2015-09-091514301-007ND
2015-10-071516030-012ND
2015-10-071516030-011ND
2015-10-071516030-006ND
2015-10-071516030-009ND
2015-11-041517576-010ND
2015-11-041517576-011ND
2015-11-041517576-007ND
2015-11-041517576-012ND
2015-12-021519086-011ND
2015-12-021519086-012ND
2015-12-021519086-007ND
2015-12-021519086-010ND