EWG's Tap Water Database — 2019 UPDATE



United Wappinger Water Improvement District

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.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20120.800 ppb330.600 ppb - 1.10 ppb
20130.600 ppb110.600 ppb
20140.635 ppb440.510 ppb - 0.720 ppb
20150.637 ppb65ND - 0.940 ppb
20160.925 ppb87ND - 1.60 ppb
20171.06 ppb880.600 ppb - 1.50 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
2012-02-14SU12307A0.700 ppb
2012-02-29CM12388A0.600 ppb
2012-08-15RM1214881.10 ppb
2013-07-31CW1313930.600 ppb
2014-08-060806141230.600 ppb
2014-09-17091714310.720 ppb
2014-12-2212221412A0.510 ppb
2014-12-22122214120.710 ppb
2015-03-24RW154650.740 ppb
2015-03-24RW154660.760 ppb
2015-06-24UW1510190.550 ppb
2015-09-08CM1516980.940 ppb
2015-09-08CM1516990.830 ppb
2016-03-15UW164330.700 ppb
2016-03-15UW164320.550 ppb
2016-06-29RW1614170.650 ppb
2016-09-20CP1624541.40 ppb
2016-09-20CP1624531.60 ppb
2016-12-07CA1642991.40 ppb
2016-12-07CA1643001.10 ppb
2017-03-29CA1745371.20 ppb
2017-03-29CA1745380.600 ppb
2017-06-13CA1711991.000 ppb
2017-06-13CA1711980.900 ppb
2017-09-12CP1722521.50 ppb
2017-09-12CP1722531.20 ppb
2017-12-05UW1730110.800 ppb
2017-12-05UW1730101.30 ppb