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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Lockport WD#3

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

 

80

Samples

0

Samples exceeding legal limit (MCL)

80

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201421.2 ppb161614.7 ppb - 28.5 ppb
201514.9 ppb8811.0 ppb - 20.3 ppb
201621.7 ppb202012.1 ppb - 44.8 ppb
201727.5 ppb121212.1 ppb - 72.5 ppb
201825.8 ppb161611.9 ppb - 45.0 ppb
201920.7 ppb8811.8 ppb - 40.1 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 Lab ID Result
2014-02-041ST QTR DBP14 LR19.3 ppb
2014-02-041ST QTR DBP14 LR16.5 ppb
2014-02-04FIRST QTR DBP LR14.7 ppb
2014-02-041ST QTR DBP14 LR19.8 ppb
2014-05-08DBP9 TLCKPT 2Q2017.7 ppb
2014-05-08DBP9 TLCKPT 2Q2016.4 ppb
2014-05-08DBP9 TLCKPT 2Q2021.0 ppb
2014-05-08DBP9 TLCKPT 2Q2017.1 ppb
2014-08-07DBP9 TLCKPT 3Q2023.1 ppb
2014-08-07DBP9 TLCKPT 3Q2025.1 ppb
2014-09-03DBP9 TLCKPT 3Q2026.6 ppb
2014-09-03DBP9 TLCKPT 3Q2020.5 ppb
2014-11-07DBP9 TLCKPT 4Q2024.7 ppb
2014-11-07DBP9 TLCKPT 4Q2019.8 ppb
2014-11-07DBP9 TLCKPT 4Q2028.5 ppb
2014-11-07DBP9 TLCKPT 4Q2027.8 ppb
2015-02-04DBP9 TLCKPT 1Q2015.9 ppb
2015-02-04DBP9 TLCKPT 1Q2015.6 ppb
2015-02-04DBP9 TLCKPT 1Q2011.0 ppb
2015-02-04DBP9 TLCKPT 1Q2012.1 ppb
2015-05-05DBP9 TLCKPT 2Q2013.7 ppb
2015-05-05DBP9 TLCKPT 2Q2020.3 ppb
2015-05-05DBP9 TLCKPT 2Q2012.7 ppb
2015-05-05DBP9 TLCKPT 2Q2017.6 ppb
2016-02-03DBP9 TLCKPT 1Q2012.2 ppb
2016-02-03DBP9 TLCKPT 1Q2015.8 ppb
2016-02-03DBP9 TLCKPT 1Q2014.5 ppb
2016-02-03DBP9 TLCKPT 1Q2023.6 ppb
2016-02-07DBP9 TLCKPT 1Q2021.2 ppb
2016-02-07DBP9 TLCKPT 1Q2012.1 ppb
2016-02-07DBP9 TLCKPT 1Q2012.6 ppb
2016-02-07DBP9 TLCKPT 1Q2015.1 ppb
2016-05-05DBP9 TLCKPT 2Q2014.7 ppb
2016-05-05DBP9 TLCKPT 2Q2017.7 ppb
2016-05-05DBP9 TLCKPT 2Q2018.5 ppb
2016-05-05DBP9 TLCKPT 2Q2015.0 ppb
2016-08-09DBP9 TLCKPT 3Q2027.9 ppb
2016-08-09DBP9 TLCKPT 3Q2044.8 ppb
2016-08-09DBP9 TLCKPT 3Q2032.4 ppb
2016-08-09DBP9 TLCKPT 3Q2032.5 ppb
2016-11-07DBP9 TLCKPT 4Q2024.9 ppb
2016-11-07DBP9 TLCKPT 4Q2041.5 ppb
2016-11-07DBP9 TLCKPT 4Q2020.1 ppb
2016-11-07DBP9 TLCKPT 4Q2016.8 ppb
2017-02-07DBP9 TLCKPT 1Q2015.1 ppb
2017-02-07DBP9 TLCKPT 1Q2012.1 ppb
2017-02-07DBP9 TLCKPT 1Q2012.6 ppb
2017-02-07DBP9 TLCKPT 1Q2021.2 ppb
2017-05-05DBP9 TLCKPT 2Q2019.3 ppb
2017-05-05DBP9 TLCKPT 2Q2018.6 ppb
2017-05-05DBP9 TLCKPT 2Q2019.0 ppb
2017-05-05DBP9 TLCKPT 2Q2024.6 ppb
2017-08-08DBP9 TLCKPT 3Q2044.8 ppb
2017-08-08DBP9 TLCKPT 3Q2035.1 ppb
2017-08-08DBP9 TLCKPT 3Q2035.2 ppb
2017-08-08DBP9 TLCKPT 3Q2072.5 ppb
2018-02-06DBP9 TLCKPT 1Q2011.9 ppb
2018-02-06DBP9 TLCKPT 1Q2012.1 ppb
2018-02-06DBP9 TLCKPT 1Q2022.2 ppb
2018-02-06DBP9 TLCKPT 1Q2011.9 ppb
2018-05-09DBP9 TLCKPT 2Q2030.4 ppb
2018-05-09DBP9 TLCKPT 2Q2019.2 ppb
2018-05-09DBP9 TLCKPT 2Q2018.3 ppb
2018-05-09DBP9 TLCKPT 2Q2020.2 ppb
2018-08-09DBP9 TLCKPT 3Q2032.4 ppb
2018-08-09DBP9 TLCKPT 3Q2045.0 ppb
2018-08-09DBP9 TLCKPT 3Q2043.5 ppb
2018-08-09DBP9 TLCKPT 3Q2038.5 ppb
2018-11-05DBP9 TLCKPT 4Q2023.1 ppb
2018-11-05DBP9 TLCKPT 4Q2019.7 ppb
2018-11-05DBP9 TLCKPT 4Q2026.2 ppb
2018-11-05DBP9 TLCKPT 4Q2039.0 ppb
2019-02-04DBP9 TLCKPT 1Q2021.7 ppb
2019-02-04DBP9 TLCKPT 1Q2015.7 ppb
2019-02-04DBP9 TLCKPT 1Q2011.8 ppb
2019-02-04DBP9 TLCKPT 1Q2017.4 ppb
2019-05-07DBP9 TLCKPT 2Q2018.9 ppb
2019-05-07DBP9 TLCKPT 2Q2040.1 ppb
2019-05-07DBP9 TLCKPT 2Q2022.4 ppb
2019-05-07DBP9 TLCKPT 2Q2017.9 ppb