Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Bromoform

City of Portsmouth

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.

 

37

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND80ND
2013N/A00N/A
2014N/A00N/A
2015N/A00N/A
2016ND100ND
2017ND190ND

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
2012-01-1112-00548THMND
2012-01-1112-00547THMND
2012-01-1112-00546THMND
2012-01-1112-00545THMND
2012-04-0412-05318THMND
2012-04-0412-05319THMND
2012-04-0912-05321THMND
2012-04-0912-05320THMND
2016-04-1816-06587-VOCND
2016-08-03216217-22ND
2016-08-03216217-21ND
2016-08-03216217-20ND
2016-08-03216217-19ND
2016-08-03216217-18ND
2016-08-03216217-16ND
2016-08-03216217-15ND
2016-08-03216217-13ND
2016-08-03216217-17ND
2017-02-01217033-20ND
2017-02-01217033-22ND
2017-02-01217033-21ND
2017-02-01217033-19ND
2017-02-01217033-15ND
2017-02-01217033-16ND
2017-02-01217033-18ND
2017-02-01217033-17ND
2017-02-01217033-13ND
2017-05-0417-07606ND
2017-11-01217306-26ND
2017-11-01217306-27ND
2017-11-01217306-28ND
2017-11-01217306-29ND
2017-11-01217306-30ND
2017-11-01217306-31ND
2017-11-01217306-32ND
2017-11-01217306-33ND
2017-11-01217306-34ND