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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Niagara Falls Water Board

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

 

136

Samples

0

Samples exceeding legal limit (MCL)

136

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201417.8 ppb32327.16 ppb - 39.1 ppb
201513.1 ppb16166.31 ppb - 24.4 ppb
201618.1 ppb32328.23 ppb - 30.3 ppb
201720.3 ppb24248.83 ppb - 36.8 ppb
201818.5 ppb32328.09 ppb - 43.1 ppb
2019N/A00N/A

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 Lab ID Result
2014-02-03 LRAA4 1Q149.17 ppb
2014-02-03 LRAA8 1Q147.40 ppb
2014-02-03 LRAA5 1Q148.58 ppb
2014-02-03 LRAA2 1Q148.92 ppb
2014-02-03 LRAA3 1Q1414.6 ppb
2014-02-03 LRAA7 1Q1410.2 ppb
2014-02-03 LRAA6 1Q147.16 ppb
2014-02-03 LRAA1 1Q1420.4 ppb
2014-05-05 LRAA8 2Q1413.3 ppb
2014-05-05 LRAA4 2Q1416.6 ppb
2014-05-05 LRAA5 2Q1411.6 ppb
2014-05-05 LRAA6 2Q1410.4 ppb
2014-05-05 LRAA3 2Q1430.3 ppb
2014-05-05 LRAA2 2Q1413.9 ppb
2014-05-05LRAA1 2Q1425.9 ppb
2014-05-05LRAA7 2Q1414.6 ppb
2014-08-04LRAA2 3Q1430.5 ppb
2014-08-04LRAA7 3Q1429.6 ppb
2014-08-04LRAA3 3Q1426.6 ppb
2014-08-04LRAA4 3Q1421.3 ppb
2014-08-04LRAA5 3Q1421.6 ppb
2014-08-04LRAA6 3Q1419.9 ppb
2014-08-04LRAA1 3Q1439.1 ppb
2014-08-04LRAA8 3Q1418.3 ppb
2014-11-03NF DBP9 2014Q4-516.2 ppb
2014-11-03NF DBP9 2014Q4-216.5 ppb
2014-11-03NF DBP9 2014Q4-611.8 ppb
2014-11-03NF DBP9 2014Q4-722.7 ppb
2014-11-03NF DBP9 2014Q4-811.7 ppb
2014-11-03NF DBP9 2014Q4-322.3 ppb
2014-11-03NF DBP9 2014Q4-413.9 ppb
2014-11-03NF DBP9 2014Q4-124.2 ppb
2015-02-02NFWB DBP9 1Q20158.87 ppb
2015-02-02NFWB DBP9 1Q20157.98 ppb
2015-02-02NFWB DBP9 1Q20157.98 ppb
2015-02-02NFWB DBP9 1Q20156.99 ppb
2015-02-02NFWB DBP9 1Q20157.20 ppb
2015-02-02NFWB DBP9 1Q201513.9 ppb
2015-02-02NFWB DBP9 1Q20156.31 ppb
2015-02-03NFWB DBP9 1Q201513.2 ppb
2015-05-04NFWB DBP9 2Q201524.4 ppb
2015-05-04NFWB DBP9 2Q201513.7 ppb
2015-05-04NFWB DBP9 2Q201516.0 ppb
2015-05-04NFWB DBP9 2Q201514.2 ppb
2015-05-04NFWB DBP9 2Q201510.4 ppb
2015-05-04NFWB DBP9 2Q201512.0 ppb
2015-05-04NFWB DBP9 2Q201523.6 ppb
2015-05-04NFWB DBP9 2Q201522.2 ppb
2016-02-01NFWB DBP9 1Q201620.7 ppb
2016-02-01NFWB DBP9 1Q20168.23 ppb
2016-02-01NFWB DBP9 1Q201616.8 ppb
2016-02-01NFWB DBP9 1Q201612.8 ppb
2016-02-01NFWB DBP9 1Q20169.84 ppb
2016-02-01NFWB DBP9 1Q201610.4 ppb
2016-02-01NFWB DBP9 1Q201629.4 ppb
2016-02-01NFWB DBP9 1Q201624.6 ppb
2016-05-04NFWB DBP9 2Q201611.5 ppb
2016-05-04NFWB DBP9 2Q201614.8 ppb
2016-05-04NFWB DBP9 2Q201623.2 ppb
2016-05-04NFWB DBP9 2Q201618.9 ppb
2016-05-04NFWB DBP9 2Q201615.1 ppb
2016-05-04NFWB DBP9 2Q201612.9 ppb
2016-05-04NFWB DBP9 2Q201612.5 ppb
2016-05-04NFWB DBP9 2Q201622.4 ppb
2016-08-01NFWB DBP9 3Q201624.4 ppb
2016-08-01NFWB DBP9 3Q201630.3 ppb
2016-08-01NFWB DBP9 3Q201619.2 ppb
2016-08-01NFWB DBP9 3Q201628.1 ppb
2016-08-01NFWB DBP9 3Q201621.3 ppb
2016-08-01NFWB DBP9 3Q201617.4 ppb
2016-08-01NFWB DBP9 3Q201621.9 ppb
2016-08-01NFWB DBP9 3Q201625.5 ppb
2016-11-07NFWB DBP9 4Q201612.3 ppb
2016-11-07NFWB DBP9 4Q201613.6 ppb
2016-11-07NFWB DBP9 4Q201614.1 ppb
2016-11-07NFWB DBP9 4Q201616.6 ppb
2016-11-07NFWB DBP9 4Q201622.5 ppb
2016-11-07NFWB DBP9 4Q201619.6 ppb
2016-11-07NFWB DBP9 4Q201612.5 ppb
2016-11-07NFWB DBP9 4Q201617.0 ppb
2017-02-08NFWB DBP9 1Q20178.83 ppb
2017-02-08NFWB DBP9 1Q201715.6 ppb
2017-02-08NFWB DBP9 1Q201712.1 ppb
2017-02-08NFWB DBP9 1Q20179.57 ppb
2017-02-08NFWB DBP9 1Q201711.1 ppb
2017-02-08NFWB DBP9 1Q201711.1 ppb
2017-02-08NFWB DBP9 1Q201710.6 ppb
2017-02-08NFWB DBP9 1Q201721.1 ppb
2017-05-03NFWB DBP9 2Q201718.0 ppb
2017-05-03NFWB DBP9 2Q201717.9 ppb
2017-05-03NFWB DBP9 2Q201718.6 ppb
2017-05-03NFWB DBP9 2Q201719.0 ppb
2017-05-03NFWB DBP9 2Q201720.6 ppb
2017-05-03NFWB DBP9 2Q201721.4 ppb
2017-05-03NFWB DBP9 2Q201725.2 ppb
2017-05-03NFWB DBP9 2Q201726.3 ppb
2017-08-07NFWB DBP9 3Q201736.8 ppb
2017-08-07NFWB DBP9 3Q201731.4 ppb
2017-08-07NFWB DBP9 3Q201727.7 ppb
2017-08-07NFWB DBP9 3Q201721.6 ppb
2017-08-07NFWB DBP9 3Q201726.1 ppb
2017-08-07NFWB DBP9 3Q201720.4 ppb
2017-08-07NFWB DBP9 3Q201724.5 ppb
2017-08-07NFWB DBP9 3Q201731.7 ppb
2018-02-05NFWB DBP9 1Q20188.48 ppb
2018-02-05NFWB DBP9 1Q201819.9 ppb
2018-02-05NFWB DBP9 1Q20189.11 ppb
2018-02-05NFWB DBP9 1Q20188.45 ppb
2018-02-05NFWB DBP9 1Q201815.8 ppb
2018-02-05NFWB DBP9 1Q20189.19 ppb
2018-02-05NFWB DBP9 1Q20188.69 ppb
2018-02-05NFWB DBP9 1Q20188.09 ppb
2018-05-07NFWB DBP9 2Q201812.8 ppb
2018-05-07NFWB DBP9 2Q201814.3 ppb
2018-05-07NFWB DBP9 2Q201811.1 ppb
2018-05-07NFWB DBP9 2Q201823.1 ppb
2018-05-07NFWB DBP9 2Q201810.6 ppb
2018-05-07NFWB DBP9 2Q201818.5 ppb
2018-05-07NFWB DBP9 2Q201813.1 ppb
2018-05-07NFWB DBP9 2Q201810.3 ppb
2018-08-06NFWB DBP9 3Q201843.1 ppb
2018-08-06NFWB DBP9 3Q201824.0 ppb
2018-08-06NFWB DBP9 3Q201829.4 ppb
2018-08-06NFWB DBP9 3Q201827.7 ppb
2018-08-06NFWB DBP9 3Q201825.8 ppb
2018-08-06NFWB DBP9 3Q201828.1 ppb
2018-08-06NFWB DBP9 3Q201827.8 ppb
2018-08-06NFWB DBP9 3Q201827.4 ppb
2018-11-07NFWB DBP9 4Q201816.8 ppb
2018-11-07NFWB DBP9 4Q201817.1 ppb
2018-11-07NFWB DBP9 4Q201823.3 ppb
2018-11-07NFWB DBP9 4Q201832.3 ppb
2018-11-07NFWB DBP9 4Q201816.2 ppb
2018-11-07NFWB DBP9 4Q201816.2 ppb
2018-11-07NFWB DBP9 4Q201817.5 ppb
2018-11-07NFWB DBP9 4Q201818.7 ppb