Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloroform

North Tonawanda City

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

 

72

Samples

0

Samples exceeding legal limit (MCL)

72

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201423.5 ppb161613.0 ppb - 49.0 ppb
201524.2 ppb16168.34 ppb - 46.5 ppb
201625.9 ppb161611.0 ppb - 48.0 ppb
201714.3 ppb4413.0 ppb - 15.0 ppb
201821.0 ppb16165.90 ppb - 44.0 ppb
201923.5 ppb4421.0 ppb - 27.0 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 Lab ID Result
2014-02-04NT DBP9 2014Q1-315.8 ppb
2014-02-04NT DBP9 2014Q1-114.9 ppb
2014-02-05NT DBP9 2014Q1-416.6 ppb
2014-02-05NT DBP9 2014Q1-217.8 ppb
2014-05-06NT DBP9 2014Q2-321.2 ppb
2014-05-06NT DBP9 2014Q2-118.3 ppb
2014-05-07NT DBP9 2014Q2-215.5 ppb
2014-05-07NT DBP9 2014Q2-413.0 ppb
2014-08-18NT DBP9 2014Q3-349.0 ppb
2014-08-18NT DBP9 2014Q3-141.0 ppb
2014-08-19NT DBP9 2014Q3-434.0 ppb
2014-08-19NT DBP9 2014Q3-234.0 ppb
2014-11-28NT DBP9 2014Q4-123.5 ppb
2014-11-28NT DBP9 2014Q4-216.0 ppb
2014-11-28NT DBP9 2014Q4-325.8 ppb
2014-11-28NT DBP9 2014Q4-418.8 ppb
2015-02-03NT DBP9 2015Q1-313.9 ppb
2015-02-03NT DBP9 2015Q1-28.34 ppb
2015-02-03NT DBP9 2015Q1-412.5 ppb
2015-02-03NT DBP9 2015Q1-18.50 ppb
2015-05-05NT DBP9 2015Q2-114.5 ppb
2015-05-05NT DBP9 2015Q2-312.9 ppb
2015-05-05NT DBP9 2015Q2-412.5 ppb
2015-05-05NT DBP9 2015Q2-210.9 ppb
2015-08-05NT DBP9 2015Q3-428.0 ppb
2015-08-05NT DBP9 2015Q3-140.2 ppb
2015-08-05NT DBP9 2015Q3-346.5 ppb
2015-08-05NT DBP9 2015Q3-228.8 ppb
2015-11-04NT DBP9 2015Q4-128.0 ppb
2015-11-04NT DBP9 2015Q4-446.0 ppb
2015-11-04NT DBP9 2015Q4-340.0 ppb
2015-11-04NT DBP9 2015Q4-236.0 ppb
2016-02-02NT DBP9 2016Q1-111.0 ppb
2016-02-02NT DBP9 2016Q1-213.0 ppb
2016-02-02NT DBP9 2016Q1-333.0 ppb
2016-02-02NT DBP9 2016Q1-412.0 ppb
2016-05-09NT DBP9 2016Q2-116.0 ppb
2016-05-09NT DBP9 2016Q2-215.0 ppb
2016-05-09NT DBP9 2016Q2-418.0 ppb
2016-05-09NT DBP9 2016Q2-341.0 ppb
2016-08-03NT DBP9 2016Q3-348.0 ppb
2016-08-03NT DBP9 2016Q3-432.0 ppb
2016-08-03NT DBP9 2016Q3-139.0 ppb
2016-08-03NT DBP9 2016Q3-237.0 ppb
2016-11-02NT DBP9 2016Q4-228.0 ppb
2016-11-02NT DBP9 2016Q4-121.0 ppb
2016-11-02NT DBP9 2016Q4-420.0 ppb
2016-11-02NT DBP9 2016Q4-331.0 ppb
2017-02-01NT DBP9 2017Q1-214.0 ppb
2017-02-01NT DBP9 2017Q1-313.0 ppb
2017-02-01NT DBP9 2017Q1-115.0 ppb
2017-02-01NT DBP9 2017Q1-415.0 ppb
2018-01-31NT DBP9 2018Q1-28.00 ppb
2018-01-31NT DBP9 2018Q1-412.0 ppb
2018-01-31NT DBP9 2018Q1-15.90 ppb
2018-01-31NT DBP9 2018Q1-312.0 ppb
2018-05-02NT DBP9 2018Q2-115.0 ppb
2018-05-02NT DBP9 2018Q2-316.0 ppb
2018-05-02NT DBP9 2018Q2-211.0 ppb
2018-05-02NT DBP9 2018Q2-415.0 ppb
2018-08-01NT DBP9 2018Q3-343.0 ppb
2018-08-01NT DBP9 2018Q3-130.0 ppb
2018-08-01NT DBP9 2018Q3-444.0 ppb
2018-08-01NT DBP9 2018Q3-234.0 ppb
2018-11-19NT DBP9 2018Q4-334.0 ppb
2018-11-19NT DBP9 2018Q4-219.0 ppb
2018-11-19NT DBP9 2018Q4-423.0 ppb
2018-11-19NT DBP9 2018Q4-114.0 ppb
2019-05-15NT DBP9 2019Q2-221.0 ppb
2019-05-15NT DBP9 2019Q2-423.0 ppb
2019-05-15NT DBP9 2019Q2-327.0 ppb
2019-05-15NT DBP9 2019Q2-123.0 ppb