EWG's Tap Water Database — 2021 UPDATE



City of Dickinson

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane 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
20141.11 ppb14140.660 ppb - 1.81 ppb
20151.01 ppb880.730 ppb - 1.42 ppb
20161.05 ppb880.670 ppb - 1.40 ppb
20171.18 ppb880.820 ppb - 1.48 ppb
20185.07 ppb880.850 ppb - 15.1 ppb
20191.30 ppb880.940 ppb - 1.51 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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
2014-02-1814-S1880.710 ppb
2014-02-1814-S1890.730 ppb
2014-02-1814-S1870.660 ppb
2014-02-1814-S1860.670 ppb
2014-05-2014-S8050.980 ppb
2014-05-2014-S8060.900 ppb
2014-05-2014-S8070.870 ppb
2014-05-2014-S8041.15 ppb
2014-08-1814-S19581.81 ppb
2014-08-1814-S19571.51 ppb
2014-08-1814-S19561.52 ppb
2014-08-1814-S19551.73 ppb
2014-11-1714-S27490.980 ppb
2014-11-1714-S27481.32 ppb
2015-02-1815-S1600.770 ppb
2015-02-1815-S1610.830 ppb
2015-05-1915-S7290.730 ppb
2015-05-1915-S7280.840 ppb
2015-08-1715-S16581.42 ppb
2015-08-1715-S16591.39 ppb
2015-11-1615-S24561.09 ppb
2015-11-1615-S24551.04 ppb
2016-02-1716-S1520.690 ppb
2016-02-1716-S1510.670 ppb
2016-05-1616-S8731.06 ppb
2016-05-1616-S8741.03 ppb
2016-08-2316-S21471.04 ppb
2016-08-2316-S21481.32 ppb
2016-11-1516-S28321.19 ppb
2016-11-1516-S28331.40 ppb
2017-02-2117-S2641.02 ppb
2017-02-2117-S2631.08 ppb
2017-05-1517-S7000.910 ppb
2017-05-1517-S7010.820 ppb
2017-08-2117-S17211.36 ppb
2017-08-2117-S17201.31 ppb
2017-11-1317-S23791.48 ppb
2017-11-1317-S23801.43 ppb
2018-02-1318-S2340.850 ppb
2018-02-1318-S2330.850 ppb
2018-05-1418-S6891.16 ppb
2018-05-1418-S6901.12 ppb
2018-08-2018-S17524.57 ppb
2018-08-2018-S17531.98 ppb
2018-11-1318-S236015.0 ppb
2018-11-1318-S235915.1 ppb
2019-02-1219-S1821.07 ppb
2019-02-1219-S1810.940 ppb
2019-05-1319-S5861.47 ppb
2019-05-1319-S5871.51 ppb
2019-08-1919-S17121.35 ppb
2019-08-1919-S17111.19 ppb
2019-11-1219-S24221.45 ppb
2019-11-1219-S24231.38 ppb