EWG's Tap Water Database


Bromodichloroacetic acid


Bromodichloroacetic acid is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloroacetic acid and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20101.96 ppb441.07 ppb - 3.04 ppb
20112.09 ppb441.32 ppb - 2.85 ppb
20123.02 ppb442.32 ppb - 4.21 ppb
20133.70 ppb772.99 ppb - 4.86 ppb
20144.40 ppb16162.38 ppb - 6.59 ppb
20155.19 ppb16163.76 ppb - 6.66 ppb

ppb = parts per billion.

All test results

Date Lab ID Result
2010-01-15AB112912.21 ppb
2010-04-20AB163593.04 ppb
2010-07-20AB276371.50 ppb
2010-10-26AB351561.07 ppb
2011-01-06AB392252.85 ppb
2011-04-20AB442051.56 ppb
2011-07-12AB513462.63 ppb
2011-10-20AB599481.32 ppb
2012-01-24AB636502.34 ppb
2012-04-25AB690924.21 ppb
2012-08-02AB780732.32 ppb
2012-10-18AB848103.20 ppb
2013-02-12AB897963.98 ppb
2013-04-23AB948652.99 ppb
2013-07-16AC041894.86 ppb
2013-10-15AC125784.31 ppb
2013-10-15AC125793.29 ppb
2013-10-15AC125803.40 ppb
2013-10-15AC125813.10 ppb
2014-01-14AC166224.40 ppb
2014-01-14AC166212.58 ppb
2014-01-14AC166204.49 ppb
2014-01-14AC166194.01 ppb
2014-04-08AC215262.38 ppb
2014-04-08AC215273.94 ppb
2014-04-08AC215283.76 ppb
2014-04-08AC215294.24 ppb
2014-07-23AC305233.87 ppb
2014-07-23AC305224.11 ppb
2014-07-23AC305244.25 ppb
2014-07-23AC305254.00 ppb
2014-10-15AC375926.59 ppb
2014-10-15AC375936.05 ppb
2014-10-15AC375945.96 ppb
2014-10-15AC375955.71 ppb
2015-01-14AC403185.15 ppb
2015-01-14AC403174.06 ppb
2015-01-14AC403194.42 ppb
2015-01-14AC403165.55 ppb
2015-04-21AC450034.63 ppb
2015-04-21AC450025.29 ppb
2015-04-21AC450014.36 ppb
2015-04-21AC450006.34 ppb
2015-07-14AC542064.03 ppb
2015-07-14AC542075.31 ppb
2015-07-14AC542055.17 ppb
2015-07-14AC542083.76 ppb
2015-10-14AC611595.72 ppb
2015-10-14AC611606.36 ppb
2015-10-14AC611616.66 ppb
2015-10-14AC611626.19 ppb