EWG's Tap Water Database — 2019 UPDATE



Macon County PWSD 1

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
20130.948 ppb440.520 ppb - 1.27 ppb
20141.08 ppb1615ND - 1.72 ppb
20151.37 ppb16160.800 ppb - 2.70 ppb
20161.50 ppb16160.620 ppb - 2.67 ppb
20171.07 ppb1612ND - 1.77 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
2013-12-09AC159730.520 ppb
2013-12-09AC159741.13 ppb
2013-12-09AC159751.27 ppb
2013-12-09AC159760.870 ppb
2014-03-12AC199271.13 ppb
2014-03-12AC199251.11 ppb
2014-03-12AC199241.13 ppb
2014-06-24AC287121.40 ppb
2014-06-24AC287141.72 ppb
2014-06-24AC287161.09 ppb
2014-06-24AC287181.64 ppb
2014-08-27AC346131.51 ppb
2014-08-27AC346141.40 ppb
2014-08-27AC346121.44 ppb
2014-08-27AC346111.34 ppb
2014-12-17AC395310.620 ppb
2014-12-17AC395300.510 ppb
2014-12-17AC395280.630 ppb
2014-12-17AC395290.610 ppb
2015-03-19AC436080.850 ppb
2015-03-19AC436091.02 ppb
2015-03-19AC436100.840 ppb
2015-03-19AC436070.800 ppb
2015-06-24AC512841.28 ppb
2015-06-24AC512851.52 ppb
2015-06-24AC512861.37 ppb
2015-06-24AC512831.68 ppb
2015-10-26AC595571.14 ppb
2015-10-26AC595581.09 ppb
2015-10-26AC595601.23 ppb
2015-10-27AC595592.34 ppb
2015-11-23AC627641.31 ppb
2015-11-23AC627631.32 ppb
2015-11-23AC627661.40 ppb
2015-11-23AC627652.70 ppb
2016-02-24AC663080.620 ppb
2016-02-24AC663090.970 ppb
2016-02-24AC663100.620 ppb
2016-02-24AC663070.630 ppb
2016-05-24AC720001.60 ppb
2016-05-24AC720011.58 ppb
2016-05-24AC720031.65 ppb
2016-05-24AC720022.67 ppb
2016-08-08AC816022.08 ppb
2016-08-08AC816041.82 ppb
2016-08-08AC816052.11 ppb
2016-08-08AC816032.00 ppb
2016-11-17AC868991.70 ppb
2016-11-17AC869001.31 ppb
2016-11-17AC869011.35 ppb
2016-11-17AC869021.27 ppb
2017-05-16AC957371.46 ppb
2017-05-16AC957341.51 ppb
2017-05-16AC957360.890 ppb
2017-05-16AC957351.23 ppb
2017-08-14AD033251.50 ppb
2017-08-14AD033241.39 ppb
2017-08-14AD033231.31 ppb
2017-08-14AD033221.52 ppb
2017-11-20AD094511.50 ppb
2017-11-20AD094501.77 ppb
2017-11-20AD094481.60 ppb
2017-11-20AD094491.41 ppb