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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Aqua Pa Hatboro

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

 

104

Samples

0

Samples exceeding legal limit (MCL)

73

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015N/A00N/A
2016N/A00N/A
201711.7 ppb3633ND - 44.0 ppb
20185.63 ppb4024ND - 40.8 ppb
20193.88 ppb2816ND - 25.4 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
2017-01-11155161537.40 ppb
2017-01-11155161547.40 ppb
2017-01-11155161657.60 ppb
2017-01-11155161667.60 ppb
2017-01-11155161772.70 ppb
2017-01-11155161782.70 ppb
2017-01-11155161892.50 ppb
2017-01-11155161902.50 ppb
2017-04-121593612411.1 ppb
2017-04-121593612511.1 ppb
2017-04-12159361369.70 ppb
2017-04-12159361379.70 ppb
2017-04-1215936148ND
2017-04-1215936149ND
2017-04-12159361603.00 ppb
2017-04-12159361613.00 ppb
2017-07-121641247733.2 ppb
2017-07-121641247833.2 ppb
2017-07-121641248625.9 ppb
2017-07-121641248725.9 ppb
2017-07-12164124901.10 ppb
2017-07-12164124911.10 ppb
2017-07-12164124952.40 ppb
2017-07-12164124962.40 ppb
2017-08-101656476340.0 ppb
2017-08-101656476444.0 ppb
2017-08-1016564771ND
2017-08-10165647755.00 ppb
2017-10-111687933516.6 ppb
2017-10-111687933616.6 ppb
2017-10-11168793479.30 ppb
2017-10-11168793489.30 ppb
2017-10-11168793596.90 ppb
2017-10-11168793606.90 ppb
2017-10-111687937127.0 ppb
2017-10-111687937227.0 ppb
2018-01-03AF727011.60 ppb
2018-01-03AF727011.60 ppb
2018-01-03AF727021.80 ppb
2018-01-03AF727021.80 ppb
2018-01-03AF727030.700 ppb
2018-01-03AF727030.700 ppb
2018-01-03AF72704ND
2018-01-03AF72704ND
2018-04-04AF8040112.3 ppb
2018-04-04AF8040112.3 ppb
2018-04-04AF80402ND
2018-04-04AF80402ND
2018-04-04AF80403ND
2018-04-04AF80403ND
2018-04-25AF8224121.0 ppb
2018-04-25AF8224121.0 ppb
2018-07-03AF8859940.8 ppb
2018-07-03AF8859940.8 ppb
2018-07-03AF886020.500 ppb
2018-07-03AF886020.500 ppb
2018-07-03AF88600ND
2018-07-03AF88600ND
2018-07-03AF88601ND
2018-07-03AF88601ND
2018-07-31AF911643.60 ppb
2018-07-31AF911643.60 ppb
2018-07-31AF9116521.6 ppb
2018-07-31AF9116521.6 ppb
2018-07-31AF911660.900 ppb
2018-07-31AF911660.900 ppb
2018-07-31AF91167ND
2018-07-31AF91167ND
2018-10-03AF971867.20 ppb
2018-10-03AF971867.20 ppb
2018-10-03AF971890.500 ppb
2018-10-03AF971890.500 ppb
2018-10-03AF97187ND
2018-10-03AF97187ND
2018-10-03AF97188ND
2018-10-03AF97188ND
2019-01-02AG0508411.3 ppb
2019-01-02AG0508411.3 ppb
2019-01-02AG050870.500 ppb
2019-01-02AG050870.500 ppb
2019-01-02AG05085ND
2019-01-02AG05085ND
2019-01-02AG050860.500 ppb
2019-01-02AG050860.500 ppb
2019-04-03AG130954.70 ppb
2019-04-03AG130954.70 ppb
2019-04-03AG130981.000 ppb
2019-04-03AG130981.000 ppb
2019-04-03AG13096ND
2019-04-03AG13096ND
2019-04-03AG13097ND
2019-04-03AG13097ND
2019-07-03AG2251525.4 ppb
2019-07-03AG2251525.4 ppb
2019-07-03AG22508ND
2019-07-03AG22508ND
2019-07-03AG22506ND
2019-07-03AG22506ND
2019-07-03AG22507ND
2019-07-03AG22507ND
2019-10-02AG343656.90 ppb
2019-10-02AG343681.70 ppb
2019-10-02AG3436612.6 ppb
2019-10-02AG343670.500 ppb