EWG's Tap Water Database — 2021 UPDATE



Mcguire Air Force Base

Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane 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
20140.753 ppb32ND - 1.20 ppb
20150.910 ppb220.740 ppb - 1.08 ppb
20161.18 ppb87ND - 2.10 ppb
20171.17 ppb1615ND - 3.50 ppb
20181.24 ppb16160.500 ppb - 2.39 ppb
20191.68 ppb16160.530 ppb - 4.41 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for dibromochloromethane 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
2014-08-14N020490-011.06 ppb
2014-08-14N020490-021.20 ppb
2015-08-12N028582-030.740 ppb
2015-08-12N028582-011.08 ppb
2016-08-10A222341.82 ppb
2016-08-10A222201.37 ppb
2016-08-10A222221.12 ppb
2016-11-16A228111.14 ppb
2016-11-16A228100.930 ppb
2016-11-16A228082.10 ppb
2016-11-16A228090.940 ppb
2017-02-15A233730.460 ppb
2017-02-15A233741.000 ppb
2017-02-15A233752.89 ppb
2017-02-15A233720.470 ppb
2017-05-17A240091.31 ppb
2017-05-17A240081.68 ppb
2017-05-17A240110.630 ppb
2017-05-17A240100.700 ppb
2017-09-20A248741.11 ppb
2017-09-20A248730.930 ppb
2017-09-20A248750.890 ppb
2017-09-20A248761.46 ppb
2017-11-15A252590.870 ppb
2017-11-15A252580.820 ppb
2017-11-15A252723.50 ppb
2018-02-14A257570.500 ppb
2018-02-14A257560.760 ppb
2018-02-14A257550.720 ppb
2018-02-14A257541.44 ppb
2018-05-16A262940.580 ppb
2018-05-16A262951.41 ppb
2018-05-16A262921.32 ppb
2018-05-16A262930.760 ppb
2018-08-15A269421.10 ppb
2018-08-15A269432.39 ppb
2018-08-15A269411.73 ppb
2018-08-15A269441.69 ppb
2018-11-14A276011.44 ppb
2018-11-14A276020.650 ppb
2018-11-14A276030.970 ppb
2018-11-14A276042.30 ppb
2019-02-21A281710.790 ppb
2019-02-21A281730.850 ppb
2019-02-21A281702.63 ppb
2019-02-21A281720.730 ppb
2019-06-28A289171.65 ppb
2019-06-28A289304.41 ppb
2019-06-28A289181.01 ppb
2019-06-28A289190.650 ppb
2019-08-14A292972.50 ppb
2019-08-14A292892.65 ppb
2019-08-14A292901.72 ppb
2019-08-14A292881.02 ppb
2019-11-13A299223.25 ppb
2019-11-13A299240.530 ppb
2019-11-13A299231.32 ppb
2019-11-13A299251.18 ppb