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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Wailuku

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

 

130

Samples

0

Samples exceeding legal limit (MCL)

108

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
20153.52 ppb3834ND - 15.0 ppb
20164.69 ppb2721ND - 24.0 ppb
20174.64 ppb2720ND - 20.0 ppb
20186.40 ppb2017ND - 21.0 ppb
20198.18 ppb1816ND - 20.0 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
2015-01-142015011902132.70 ppb
2015-01-142015011902141.40 ppb
2015-01-142015011902151.50 ppb
2015-01-142015011902161.80 ppb
2015-01-142015011902184.50 ppb
2015-01-1420150119021914.0 ppb
2015-01-152015011902232.60 ppb
2015-01-152015011902242.00 ppb
2015-01-26201501280565ND
2015-01-26201501280741ND
2015-01-26201501280752ND
2015-01-262015012807531.000 ppb
2015-04-092015041408173.00 ppb
2015-04-092015041408181.80 ppb
2015-04-092015041408192.10 ppb
2015-04-092015041408201.80 ppb
2015-04-092015041408316.00 ppb
2015-04-092015041408323.60 ppb
2015-04-092015041408333.60 ppb
2015-04-0920150414083413.0 ppb
2015-06-162015061805190.600 ppb
2015-07-222015072402727.00 ppb
2015-07-222015072402731.40 ppb
2015-07-222015072402740.890 ppb
2015-07-222015072402752.10 ppb
2015-07-222015072402763.30 ppb
2015-07-222015072402771.50 ppb
2015-07-2220150724027811.0 ppb
2015-07-222015072402792.00 ppb
2015-09-08201509100855ND
2015-10-092015101303163.70 ppb
2015-10-092015101303173.20 ppb
2015-10-092015101303182.60 ppb
2015-10-092015101303192.50 ppb
2015-10-092015101303204.90 ppb
2015-10-092015101303213.00 ppb
2015-10-092015101303222.70 ppb
2015-10-0920151013032315.0 ppb
2016-01-153.60 ppb
2016-01-151.40 ppb
2016-01-154.80 ppb
2016-01-151.70 ppb
2016-01-151.60 ppb
2016-01-153.10 ppb
2016-01-153.70 ppb
2016-01-1514.0 ppb
2016-02-231.000 ppb
2016-02-26ND
2016-02-26ND
2016-02-26ND
2016-04-146.70 ppb
2016-04-143.40 ppb
2016-04-142.00 ppb
2016-04-1411.0 ppb
2016-07-155.90 ppb
2016-07-153.50 ppb
2016-07-153.20 ppb
2016-07-1523.0 ppb
2016-09-12ND
2016-10-063.60 ppb
2016-10-063.80 ppb
2016-10-061.60 ppb
2016-10-0624.0 ppb
2016-11-30ND
2016-11-30ND
2017-01-134.60 ppb
2017-01-132.90 ppb
2017-01-132.40 ppb
2017-01-1320.0 ppb
2017-01-310.780 ppb
2017-01-310.560 ppb
2017-01-31ND
2017-02-243.10 ppb
2017-02-24ND
2017-02-27ND
2017-02-27ND
2017-02-27ND
2017-04-064.00 ppb
2017-04-063.00 ppb
2017-04-062.70 ppb
2017-04-0620.0 ppb
2017-05-190.520 ppb
2017-05-19ND
2017-07-136.50 ppb
2017-07-133.80 ppb
2017-07-132.70 ppb
2017-07-1317.0 ppb
2017-09-21ND
2017-10-066.30 ppb
2017-10-063.50 ppb
2017-10-063.00 ppb
2017-10-0618.0 ppb
2018-01-112018011806407.70 ppb
2018-01-112018011806434.40 ppb
2018-01-112018011806422.90 ppb
2018-01-1120180118064121.0 ppb
2018-01-30201801030999ND
2018-01-312018010309981.70 ppb
2018-01-31201801031000ND
2018-04-0520180410050310.00 ppb
2018-04-052018041005066.20 ppb
2018-04-052018041005052.60 ppb
2018-04-0520180410050421.0 ppb
2018-05-17201805180453ND
2018-07-022018070601767.10 ppb
2018-07-022018070601792.60 ppb
2018-07-022018070601782.00 ppb
2018-07-0220180706017712.0 ppb
2018-10-042018100903824.40 ppb
2018-10-042018100903855.60 ppb
2018-10-042018100903841.70 ppb
2018-10-0420181009038315.0 ppb
2019-01-032019010800775.20 ppb
2019-01-032019010800804.90 ppb
2019-01-032019010800792.80 ppb
2019-01-0320190108007818.0 ppb
2019-02-04201902050178ND
2019-03-07201903120187ND
2019-04-052019040904746.20 ppb
2019-04-052019040904776.60 ppb
2019-04-052019040904763.00 ppb
2019-04-0520190409047520.0 ppb
2019-07-2620190730033818.0 ppb
2019-07-262019073003418.20 ppb
2019-07-262019073003402.70 ppb
2019-07-2620190730033915.0 ppb
2019-10-0320191008060412.0 ppb
2019-10-032019100806077.00 ppb
2019-10-032019100806063.60 ppb
2019-10-0320191008060514.0 ppb