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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Loudoun Water - Central System

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

 

224

Samples

0

Samples exceeding legal limit (MCL)

78

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.305 ppb3212ND - 1.02 ppb
20150.379 ppb3215ND - 1.15 ppb
20160.335 ppb3212ND - 1.46 ppb
20170.456 ppb3214ND - 2.27 ppb
20180.215 ppb4812ND - 1.31 ppb
20190.190 ppb4814ND - 0.850 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
2014-02-10FW14012202-04_TH0.720 ppb
2014-02-10FW14012202-07_TH0.700 ppb
2014-02-10FW14012202-01_THND
2014-02-10FW14012202-08_THND
2014-02-10FW14012202-03_THND
2014-02-10FW14012202-02_THND
2014-02-10FW14012202-06_THND
2014-02-10FW14012202-05_THND
2014-05-05FW14050106-02_THND
2014-05-05FW14050106-06_THND
2014-05-05FW14050106-08_THND
2014-05-05FW14050106-03_THND
2014-05-05FW14050106-05_THND
2014-05-05FW14050106-01_THND
2014-05-06FW14050106-07_THND
2014-05-06FW14050106-04_THND
2014-08-12FW14072402-01_TH1.02 ppb
2014-08-12FW14072402-04_TH0.940 ppb
2014-08-12FW14072402-07_TH0.900 ppb
2014-08-12FW14072402-08_TH0.900 ppb
2014-08-13FW14072402-05_TH0.970 ppb
2014-08-13FW14072402-06_THND
2014-08-13FW14072402-03_THND
2014-08-13FW14072402-02_THND
2014-11-12FW141016007-01_T0.890 ppb
2014-11-12FW141016007-08_T0.800 ppb
2014-11-12FW141016007-02_TND
2014-11-13FW141016007-07_T0.730 ppb
2014-11-13FW141016007-04_T0.700 ppb
2014-11-13FW141016007-05_T0.500 ppb
2014-11-13FW141016007-03_TND
2014-11-13FW141016007-06_TND
2015-02-0900125-FAIRFAX CO0.680 ppb
2015-02-0900125-FAIRFAX CO0.670 ppb
2015-02-0900125-FAIRFAX CO0.520 ppb
2015-02-0900125-FAIRFAX COND
2015-02-0900125-FAIRFAX COND
2015-02-0900125-FAIRFAX COND
2015-02-0900125-FAIRFAX COND
2015-02-0900125-FAIRFAX COND
2015-05-1100125-FAIRFAX CO0.580 ppb
2015-05-1100125-FAIRFAX CO0.550 ppb
2015-05-1100125-FAIRFAX CO0.540 ppb
2015-05-1100125-FAIRFAX COND
2015-05-1100125-FAIRFAX COND
2015-05-1100125-FAIRFAX COND
2015-05-1100125-FAIRFAX COND
2015-05-1100125-FAIRFAX COND
2015-08-1000125-FAIRFAX CO1.15 ppb
2015-08-1000125-FAIRFAX CO1.12 ppb
2015-08-1000125-FAIRFAX CO1.09 ppb
2015-08-1000125-FAIRFAX CO1.07 ppb
2015-08-1000125-FAIRFAX COND
2015-08-1000125-FAIRFAX COND
2015-08-1000125-FAIRFAX COND
2015-08-1100125-FAIRFAX CO1.11 ppb
2015-11-0900125-FAIRFAX CO0.890 ppb
2015-11-0900125-FAIRFAX CO0.840 ppb
2015-11-0900125-FAIRFAX CO0.720 ppb
2015-11-0900125-FAIRFAX CO0.590 ppb
2015-11-0900125-FAIRFAX COND
2015-11-1000125-FAIRFAX COND
2015-11-1000125-FAIRFAX COND
2015-11-1000125-FAIRFAX COND
2016-02-08FW160121026-07_T0.910 ppb
2016-02-08FW160121026-05_T0.710 ppb
2016-02-08FW160121026-06_T0.670 ppb
2016-02-08FW160121026-04_T0.600 ppb
2016-02-08FW160121026-01_TND
2016-02-08FW160121026-02_TND
2016-02-08FW160121026-03_TND
2016-02-08FW160121026-08_TND
2016-05-09FW160422002-04_T0.690 ppb
2016-05-09FW160422002-05_T0.580 ppb
2016-05-09FW160422002-01_TND
2016-05-09FW160422002-02_TND
2016-05-09FW160422002-03_TND
2016-05-09FW160422002-06_TND
2016-05-09FW160422002-07_TND
2016-05-09FW160422002-08_TND
2016-08-08FW160713007-05_T1.46 ppb
2016-08-08FW160713007-07_T1.26 ppb
2016-08-08FW160713007-08_T1.24 ppb
2016-08-08FW160713007-01_T1.07 ppb
2016-08-08FW160713007-02_TND
2016-08-08FW160713007-03_TND
2016-08-08FW160713007-04_TND
2016-08-08FW160713007-06_TND
2016-11-07FW160915004-08_T0.850 ppb
2016-11-07FW160915004-07_T0.690 ppb
2016-11-07FW160915004-01_TND
2016-11-07FW160915004-02_TND
2016-11-07FW160915004-05_TND
2016-11-08FW160915004-03_TND
2016-11-08FW160915004-04_TND
2016-11-08FW160915004-06_TND
2017-02-06FW170105011-08_T0.760 ppb
2017-02-06FW170105011-02_T0.730 ppb
2017-02-06FW170105011-07_T0.670 ppb
2017-02-06FW170105011-05_T0.660 ppb
2017-02-07FW170105011-01_T0.870 ppb
2017-02-07FW170105011-04_T0.830 ppb
2017-02-07FW170105011-06_T0.780 ppb
2017-02-07FW170105011-03_T0.680 ppb
2017-05-08FW170414002-02_TND
2017-05-08FW170414002-03_TND
2017-05-08FW170414002-04_TND
2017-05-08FW170414002-05_TND
2017-05-08FW170414002-06_TND
2017-05-08FW170414002-07_TND
2017-05-09FW170414002-01_TND
2017-05-09FW170414002-08_TND
2017-08-08FW170628011-08_T2.27 ppb
2017-08-08FW170628011-01_T2.18 ppb
2017-08-08FW170628011-07_T2.04 ppb
2017-08-08FW170628011-02_TND
2017-08-08FW170628011-03_TND
2017-08-08FW170628011-04_TND
2017-08-08FW170628011-05_TND
2017-08-08FW170628011-06_TND
2017-11-06FW170919019-05_T0.730 ppb
2017-11-06FW170919019-01_TND
2017-11-06FW170919019-02_TND
2017-11-06FW170919019-04_TND
2017-11-06FW170919019-07_TND
2017-11-06FW170919019-08_TND
2017-11-07FW170919019-06_T0.770 ppb
2017-11-07FW170919019-03_T0.620 ppb
2018-02-12FW180205007-02_T0.730 ppb
2018-02-12FW180205007-05_T1.31 ppb
2018-02-12FW180205007-06_T0.890 ppb
2018-02-12FW180205007-07_T0.830 ppb
2018-02-12FW180205007-10_T0.660 ppb
2018-02-12FW180205007-11_T0.570 ppb
2018-02-12FW180205007-12_T0.740 ppb
2018-02-13FW180205007-01_T0.800 ppb
2018-02-13FW180205007-03_T0.830 ppb
2018-02-13FW180205007-04_T0.990 ppb
2018-02-13FW180205007-08_T1.04 ppb
2018-02-13FW180205007-09_T0.950 ppb
2018-05-07FW180314013-02_TND
2018-05-07FW180314013-05_TND
2018-05-07FW180314013-11_TND
2018-05-07FW180314013-12_TND
2018-05-08FW180314013-01_TND
2018-05-08FW180314013-03_TND
2018-05-08FW180314013-04_TND
2018-05-08FW180314013-06_TND
2018-05-08FW180314013-07_TND
2018-05-08FW180314013-08_TND
2018-05-08FW180314013-09_TND
2018-05-08FW180314013-10_TND
2018-08-13FW180614003-06_TND
2018-08-13FW180614003-07_TND
2018-08-13FW180614003-10_TND
2018-08-13FW180614003-11_TND
2018-08-14FW180614003-01_TND
2018-08-14FW180614003-02_TND
2018-08-14FW180614003-03_TND
2018-08-14FW180614003-04_TND
2018-08-14FW180614003-05_TND
2018-08-14FW180614003-08_TND
2018-08-14FW180614003-09_TND
2018-08-14FW180614003-12_TND
2018-11-13FW180926011-01_TND
2018-11-13FW180926011-02_TND
2018-11-13FW180926011-03_TND
2018-11-13FW180926011-04_TND
2018-11-13FW180926011-05_TND
2018-11-13FW180926011-12_TND
2018-11-14FW180926011-06_TND
2018-11-14FW180926011-07_TND
2018-11-14FW180926011-08_TND
2018-11-14FW180926011-09_TND
2018-11-14FW180926011-10_TND
2018-11-14FW180926011-11_TND
2019-02-10FW190114006-04_TND
2019-02-10FW190114006-05_TND
2019-02-10FW190114006-06_TND
2019-02-10FW190114006-07_TND
2019-02-10FW190114006-09_TND
2019-02-11FW190114006-01_TND
2019-02-11FW190114006-02_TND
2019-02-11FW190114006-03_TND
2019-02-11FW190114006-10_TND
2019-02-11FW190114006-11_TND
2019-02-11FW190114006-12_TND
2019-02-12FW190114006-08_TND
2019-05-12FW190422010-05_TND
2019-05-12FW190422010-06_TND
2019-05-12FW190422010-09_TND
2019-05-13FW190422010-01_TND
2019-05-13FW190422010-02_TND
2019-05-13FW190422010-04_TND
2019-05-13FW190422010-10_TND
2019-05-13FW190422010-12_TND
2019-05-14FW190422010-03_TND
2019-05-14FW190422010-07_TND
2019-05-14FW190422010-08_TND
2019-05-14FW190422010-11_TND
2019-08-12FW190726006-01_T0.690 ppb
2019-08-12FW190726006-02_T0.600 ppb
2019-08-12FW190726006-03_TND
2019-08-12FW190726006-04_T0.510 ppb
2019-08-12FW190726006-07_TND
2019-08-12FW190726006-08_TND
2019-08-12FW190726006-10_TND
2019-08-12FW190726006-12_T0.800 ppb
2019-08-13FW190726006-05_T0.800 ppb
2019-08-13FW190726006-06_T0.850 ppb
2019-08-13FW190726006-09_T0.620 ppb
2019-08-13FW190726006-11_T0.790 ppb
2019-11-09FW191027001-04_T0.580 ppb
2019-11-09FW191027001-05_T0.620 ppb
2019-11-09FW191027001-06_T0.570 ppb
2019-11-09FW191027001-09_TND
2019-11-09FW191027001-11_T0.560 ppb
2019-11-12FW191027001-01_TND
2019-11-12FW191027001-02_TND
2019-11-12FW191027001-03_TND
2019-11-12FW191027001-07_T0.580 ppb
2019-11-12FW191027001-08_T0.550 ppb
2019-11-12FW191027001-10_TND
2019-11-13FW191027001-12_TND