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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Pennsylvania American Norristown

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

 

200

Samples

0

Samples exceeding legal limit (MCL)

115

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.25 ppb3216ND - 8.40 ppb
20150.678 ppb3224ND - 1.70 ppb
20161.98 ppb3225ND - 4.40 ppb
20170.997 ppb3221ND - 3.10 ppb
20180.580 ppb4024ND - 2.20 ppb
20190.941 ppb3214ND - 4.50 ppb

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
2014-01-0924397501ND
2014-01-0924397701ND
2014-01-0924397301ND
2014-01-0924397201ND
2014-01-0924398301ND
2014-01-0924397601ND
2014-01-0924397801ND
2014-01-0924397401ND
2014-04-0825321401ND
2014-04-0825321601ND
2014-04-0825321101ND
2014-04-0825321001ND
2014-04-0825322701ND
2014-04-0825321501ND
2014-04-0825321701ND
2014-04-0825321201ND
2014-07-08260941013.20 ppb
2014-07-08260936012.00 ppb
2014-07-08260951012.20 ppb
2014-07-08260940012.30 ppb
2014-07-08260937012.10 ppb
2014-07-09260939012.60 ppb
2014-07-09260935012.10 ppb
2014-07-09260942012.10 ppb
2014-10-07270897016.30 ppb
2014-10-07270896017.30 ppb
2014-10-07270909016.10 ppb
2014-10-07270902015.00 ppb
2014-10-08270899017.30 ppb
2014-10-08270901018.40 ppb
2014-10-08270900016.90 ppb
2014-10-08270898016.10 ppb
2015-01-07122883530.500 ppb
2015-01-0712288365ND
2015-01-0712288341ND
2015-01-0712288335ND
2015-01-0712288377ND
2015-01-0712288359ND
2015-01-0712288371ND
2015-01-0712288347ND
2015-04-07126342880.700 ppb
2015-04-07126342760.600 ppb
2015-04-07126342700.600 ppb
2015-04-07126343140.600 ppb
2015-04-0712634306ND
2015-04-08126343000.500 ppb
2015-04-08126342940.600 ppb
2015-04-08126342820.700 ppb
2015-07-07130140531.10 ppb
2015-07-07130140651.000 ppb
2015-07-07130140351.20 ppb
2015-07-07130140291.20 ppb
2015-07-07130140731.20 ppb
2015-07-07130140591.20 ppb
2015-07-07130140471.30 ppb
2015-07-07130140411.30 ppb
2015-10-07133903640.700 ppb
2015-10-07133903761.10 ppb
2015-10-07133903520.500 ppb
2015-10-07133903461.10 ppb
2015-10-07133903840.800 ppb
2015-10-07133903700.700 ppb
2015-10-07133903580.800 ppb
2015-10-13133903901.70 ppb
2016-01-06137540620.500 ppb
2016-01-0613754074ND
2016-01-0613754044ND
2016-01-0613754038ND
2016-01-0613754082ND
2016-01-0613754068ND
2016-01-0613754056ND
2016-01-0613754050ND
2016-04-07141040880.500 ppb
2016-04-07141041000.900 ppb
2016-04-07141040700.800 ppb
2016-04-07141040640.800 ppb
2016-04-07141041080.700 ppb
2016-04-07141040940.600 ppb
2016-04-07141040820.600 ppb
2016-04-07141040760.700 ppb
2016-07-11145714194.00 ppb
2016-07-11145714313.80 ppb
2016-07-11145714013.60 ppb
2016-07-11145713954.00 ppb
2016-07-11145714374.40 ppb
2016-07-11145714253.60 ppb
2016-07-11145714133.70 ppb
2016-07-11145714073.80 ppb
2016-10-10150769594.00 ppb
2016-10-10150769712.30 ppb
2016-10-10150769412.90 ppb
2016-10-10150769351.80 ppb
2016-10-10150769793.50 ppb
2016-10-10150769653.00 ppb
2016-10-10150769534.30 ppb
2016-10-10150769474.40 ppb
2017-01-09155187090.600 ppb
2017-01-09155187150.700 ppb
2017-01-0915518685ND
2017-01-09155186790.700 ppb
2017-01-09155187240.500 ppb
2017-01-0915518703ND
2017-01-0915518691ND
2017-01-09155186970.600 ppb
2017-04-03159388960.800 ppb
2017-04-0315938902ND
2017-04-0315938872ND
2017-04-0315938866ND
2017-04-0315938911ND
2017-04-0315938890ND
2017-04-0315938878ND
2017-04-0315938884ND
2017-07-11164151690.800 ppb
2017-07-11164151752.00 ppb
2017-07-1116415145ND
2017-07-11164151390.800 ppb
2017-07-11164151840.700 ppb
2017-07-11164151630.500 ppb
2017-07-11164151510.600 ppb
2017-07-11164151570.900 ppb
2017-10-10168818703.10 ppb
2017-10-11168818822.60 ppb
2017-10-11168818882.70 ppb
2017-10-11168818582.30 ppb
2017-10-11168818523.00 ppb
2017-10-11168818972.80 ppb
2017-10-11168818762.40 ppb
2017-10-11168818642.80 ppb
2018-01-09381504011.30 ppb
2018-01-09381505012.20 ppb
2018-01-09381500011.50 ppb
2018-01-09381499012.00 ppb
2018-01-09381513011.30 ppb
2018-01-09381503011.20 ppb
2018-01-09381501011.30 ppb
2018-01-09381502011.90 ppb
2018-04-0339059801ND
2018-04-0339059901ND
2018-04-0339059301ND
2018-04-0339059201ND
2018-04-0339061101ND
2018-04-0339059601ND
2018-04-0339059401ND
2018-04-0339059501ND
2018-07-10401911010.700 ppb
2018-07-10401912010.700 ppb
2018-07-10401906011.000 ppb
2018-07-10401905011.000 ppb
2018-07-10401914010.600 ppb
2018-07-10401909010.600 ppb
2018-07-10401907010.600 ppb
2018-07-10401908010.700 ppb
2018-08-0940937701ND
2018-08-0940937801ND
2018-08-0940780501ND
2018-08-0940937301ND
2018-08-0940937901ND
2018-08-0940937601ND
2018-08-0940937401ND
2018-08-0940937501ND
2018-10-09413012010.600 ppb
2018-10-09413013010.600 ppb
2018-10-09413007010.600 ppb
2018-10-09413006010.500 ppb
2018-10-09413015010.600 ppb
2018-10-09413010010.500 ppb
2018-10-09413008010.600 ppb
2018-10-09413009010.600 ppb
2019-01-0942488601ND
2019-01-0942488701ND
2019-01-0942488101ND
2019-01-0942488001ND
2019-01-0942488901ND
2019-01-0942488401ND
2019-01-0942488201ND
2019-01-0942488301ND
2019-04-0343647201ND
2019-04-0343647301ND
2019-04-0343647401ND
2019-04-0343647101ND
2019-04-0343647501ND
2019-04-0343647601ND
2019-04-0343647701ND
2019-04-0343647801ND
2019-07-09450015010.700 ppb
2019-07-09450016011.30 ppb
2019-07-09450014011.000 ppb
2019-07-09450013010.900 ppb
2019-07-09450017010.700 ppb
2019-07-0945002201ND
2019-07-0945001901ND
2019-07-09450024010.800 ppb
2019-10-09468228013.80 ppb
2019-10-09468229014.50 ppb
2019-10-09468227012.00 ppb
2019-10-09468226014.40 ppb
2019-10-09468230013.20 ppb
2019-10-09468234011.50 ppb
2019-10-09468231011.70 ppb
2019-10-09468236013.60 ppb