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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Burlington Water Department

Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Read More.

In addition to tap water disinfection, chloroform pollution in the environment also comes from industrial discharges from pulp and paper mills, and from urban wastewater effluent. Human studies show that chloroform damages the kidneys, liver and central nervous system. In animals, chloroform causes infertility, birth defects and cancer.

Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

251

Samples

0

Samples exceeding legal limit (MCL)

217

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20145.05 ppb5538ND - 36.0 ppb
201514.0 ppb4037ND - 38.0 ppb
20169.33 ppb4339ND - 29.0 ppb
201715.7 ppb4035ND - 62.0 ppb
201814.1 ppb3634ND - 46.0 ppb
201912.6 ppb3734ND - 42.0 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform 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 Result
2014-02-042.90 ppb
2014-02-040.500 ppb
2014-03-043.00 ppb
2014-03-04ND
2014-05-2215.0 ppb
2014-06-0518.9 ppb
2014-06-0516.5 ppb
2014-06-05ND
2014-06-1319.0 ppb
2014-06-17ND
2014-06-1823.0 ppb
2014-06-18ND
2014-07-010.600 ppb
2014-07-010.700 ppb
2014-07-020.900 ppb
2014-07-021.000 ppb
2014-07-030.700 ppb
2014-07-030.800 ppb
2014-07-110.600 ppb
2014-07-110.700 ppb
2014-07-17ND
2014-07-1827.0 ppb
2014-07-23ND
2014-07-230.700 ppb
2014-07-2528.0 ppb
2014-07-29ND
2014-07-290.700 ppb
2014-08-0136.0 ppb
2014-08-0429.0 ppb
2014-08-040.500 ppb
2014-08-07ND
2014-08-071.10 ppb
2014-08-12ND
2014-08-120.900 ppb
2014-08-22ND
2014-08-221.30 ppb
2014-08-30ND
2014-08-301.40 ppb
2014-09-050.600 ppb
2014-09-05ND
2014-09-051.40 ppb
2014-09-10ND
2014-09-10ND
2014-09-101.10 ppb
2014-10-1613.0 ppb
2014-10-16ND
2014-10-161.20 ppb
2014-11-0413.0 ppb
2014-11-040.600 ppb
2014-11-202.40 ppb
2014-11-20ND
2014-11-201.80 ppb
2014-12-11ND
2014-12-111.20 ppb
2014-12-2210.00 ppb
2015-01-2111.0 ppb
2015-02-0312.0 ppb
2015-02-031.40 ppb
2015-02-0318.0 ppb
2015-02-037.10 ppb
2015-02-0315.0 ppb
2015-02-0323.0 ppb
2015-02-249.40 ppb
2015-02-249.90 ppb
2015-02-241.10 ppb
2015-03-178.30 ppb
2015-04-1410.00 ppb
2015-05-0518.0 ppb
2015-05-05ND
2015-05-0525.0 ppb
2015-05-0519.0 ppb
2015-05-0511.0 ppb
2015-05-0522.0 ppb
2015-05-0617.0 ppb
2015-06-0123.0 ppb
2015-06-020.500 ppb
2015-07-100.700 ppb
2015-07-2233.0 ppb
2015-08-0334.0 ppb
2015-08-03ND
2015-08-0338.0 ppb
2015-08-0319.0 ppb
2015-08-0316.0 ppb
2015-08-0328.0 ppb
2015-08-0733.0 ppb
2015-09-0838.0 ppb
2015-10-0526.0 ppb
2015-10-160.600 ppb
2015-11-04ND
2015-11-042.60 ppb
2015-11-044.80 ppb
2015-11-041.60 ppb
2015-11-0411.0 ppb
2015-11-197.50 ppb
2015-12-166.20 ppb
2016-01-040.610 ppb
2016-01-110.690 ppb
2016-01-146.70 ppb
2016-02-018.60 ppb
2016-02-01ND
2016-02-012.50 ppb
2016-02-013.00 ppb
2016-02-012.00 ppb
2016-02-014.20 ppb
2016-02-126.40 ppb
2016-02-186.60 ppb
2016-02-180.630 ppb
2016-03-107.40 ppb
2016-04-2213.0 ppb
2016-05-0215.0 ppb
2016-05-0224.0 ppb
2016-05-0224.0 ppb
2016-05-0223.0 ppb
2016-05-0227.0 ppb
2016-05-0914.0 ppb
2016-05-240.610 ppb
2016-05-31ND
2016-06-0316.0 ppb
2016-07-1521.0 ppb
2016-07-150.600 ppb
2016-08-0121.0 ppb
2016-08-01ND
2016-08-0129.0 ppb
2016-08-0113.0 ppb
2016-08-011.20 ppb
2016-08-0121.0 ppb
2016-08-1523.0 ppb
2016-09-1514.0 ppb
2016-10-130.540 ppb
2016-10-198.30 ppb
2016-11-098.20 ppb
2016-11-09ND
2016-11-094.60 ppb
2016-11-097.00 ppb
2016-11-091.60 ppb
2016-11-094.90 ppb
2016-11-299.30 ppb
2016-12-056.90 ppb
2017-01-237.20 ppb
2017-02-078.00 ppb
2017-02-08ND
2017-02-082.20 ppb
2017-02-082.60 ppb
2017-02-081.90 ppb
2017-02-086.80 ppb
2017-02-217.00 ppb
2017-02-220.770 ppb
2017-03-177.80 ppb
2017-03-177.50 ppb
2017-03-170.940 ppb
2017-04-030.930 ppb
2017-04-1810.00 ppb
2017-05-0315.0 ppb
2017-05-0318.0 ppb
2017-05-0319.0 ppb
2017-05-0318.0 ppb
2017-05-0320.0 ppb
2017-05-2220.0 ppb
2017-06-2740.0 ppb
2017-07-1943.0 ppb
2017-08-0952.0 ppb
2017-08-09ND
2017-08-0962.0 ppb
2017-08-0911.0 ppb
2017-08-0919.0 ppb
2017-08-0955.0 ppb
2017-08-2533.0 ppb
2017-08-28ND
2017-09-2224.0 ppb
2017-10-2316.0 ppb
2017-11-0618.0 ppb
2017-11-06ND
2017-11-0623.0 ppb
2017-11-0616.0 ppb
2017-11-0610.00 ppb
2017-11-0624.0 ppb
2017-12-198.30 ppb
2017-12-29ND
2018-01-268.40 ppb
2018-02-058.70 ppb
2018-02-0511.0 ppb
2018-02-0514.0 ppb
2018-02-0513.0 ppb
2018-02-0515.0 ppb
2018-03-1410.00 ppb
2018-03-2312.0 ppb
2018-04-2410.00 ppb
2018-05-0720.0 ppb
2018-05-0718.0 ppb
2018-05-0720.0 ppb
2018-05-0724.0 ppb
2018-05-0816.0 ppb
2018-05-08ND
2018-06-290.690 ppb
2018-07-1246.0 ppb
2018-07-230.680 ppb
2018-07-2626.0 ppb
2018-08-09ND
2018-08-095.80 ppb
2018-08-099.50 ppb
2018-08-091.60 ppb
2018-08-0928.0 ppb
2018-08-2427.0 ppb
2018-08-290.780 ppb
2018-09-1823.0 ppb
2018-10-2416.0 ppb
2018-11-0720.0 ppb
2018-11-071.20 ppb
2018-11-0726.0 ppb
2018-11-0721.0 ppb
2018-11-0719.0 ppb
2018-11-0728.0 ppb
2018-11-270.690 ppb
2018-12-318.20 ppb
2019-01-158.60 ppb
2019-02-048.90 ppb
2019-02-0413.0 ppb
2019-02-0415.0 ppb
2019-02-0414.0 ppb
2019-02-0416.0 ppb
2019-02-05ND
2019-02-050.630 ppb
2019-02-078.80 ppb
2019-03-2512.0 ppb
2019-04-2312.0 ppb
2019-05-06ND
2019-05-063.00 ppb
2019-05-0613.0 ppb
2019-05-061.70 ppb
2019-05-0615.0 ppb
2019-05-1412.0 ppb
2019-07-0220.5 ppb
2019-07-02ND
2019-08-0537.0 ppb
2019-08-051.40 ppb
2019-08-0538.0 ppb
2019-08-0519.0 ppb
2019-08-052.50 ppb
2019-08-0542.0 ppb
2019-09-2023.0 ppb
2019-09-201.30 ppb
2019-10-2913.0 ppb
2019-10-291.06 ppb
2019-11-0414.0 ppb
2019-11-047.80 ppb
2019-11-0420.0 ppb
2019-11-0421.0 ppb
2019-11-0419.0 ppb
2019-11-0422.0 ppb
2019-12-237.91 ppb
2019-12-232.09 ppb