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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Northampton Bucks County Municipal Authority

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

 

143

Samples

0

Samples exceeding legal limit (MCL)

104

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.90 ppb2310ND - 24.5 ppb
20151.29 ppb156ND - 9.90 ppb
20160.491 ppb115ND - 2.10 ppb
201714.5 ppb5343ND - 41.0 ppb
201819.5 ppb2524ND - 51.0 ppb
201923.6 ppb16169.30 ppb - 66.8 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
2014-02-25L4951918-1ND
2014-02-25L4951922-1ND
2014-05-20L4799412-1ND
2014-05-20L4690565-1ND
2014-07-17L5163463-10.900 ppb
2014-07-17L5163463-21.90 ppb
2014-07-17L5163463-31.30 ppb
2014-07-17L5163463-40.700 ppb
2014-07-17L5163463-72.30 ppb
2014-07-17L5163463-8ND
2014-07-17L5163463-90.900 ppb
2014-07-17L5163463-11ND
2014-07-17L5163463-100.800 ppb
2014-07-17L5163463-12ND
2014-07-17L5163463-524.5 ppb
2014-07-17L5163463-6ND
2014-07-17L5163463-14ND
2014-07-17L5163463-15ND
2014-07-17L5163463-13ND
2014-08-15L4460454-1ND
2014-08-15L4359849-16.10 ppb
2014-12-04L5352437-1ND
2014-12-04L5352436-14.30 ppb
2015-02-1012390418ND
2015-02-10123904724.30 ppb
2015-05-1112738474ND
2015-05-11127384200.800 ppb
2015-07-0913859309ND
2015-07-09138594171.20 ppb
2015-07-0913859363ND
2015-08-1913123816ND
2015-08-19131238709.90 ppb
2015-08-28131243912.60 ppb
2015-11-2013503356ND
2015-11-20135034100.500 ppb
2015-11-2013503464ND
2015-11-2013503518ND
2015-11-2013503572ND
2016-02-2313974933ND
2016-02-23139749860.500 ppb
2016-02-2313975039ND
2016-02-2313975092ND
2016-02-2313975145ND
2016-05-2414237893ND
2016-07-21145556001.50 ppb
2016-07-21145556520.800 ppb
2016-07-21145557560.500 ppb
2016-07-21145557042.10 ppb
2016-08-3014892496ND
2017-01-17155041096.20 ppb
2017-01-17155041106.20 ppb
2017-01-17155041217.90 ppb
2017-01-17155041227.90 ppb
2017-01-171550413320.4 ppb
2017-01-171550413420.4 ppb
2017-01-171550414512.5 ppb
2017-01-171550414612.5 ppb
2017-02-2715644160ND
2017-04-121592351312.0 ppb
2017-04-121592351412.0 ppb
2017-04-121592352519.9 ppb
2017-04-121592352619.9 ppb
2017-04-121592353731.3 ppb
2017-04-121592353831.3 ppb
2017-04-121592354916.1 ppb
2017-04-121592355016.1 ppb
2017-06-0716243949ND
2017-07-171640090724.1 ppb
2017-07-171640090824.1 ppb
2017-07-171640091319.9 ppb
2017-07-171640091419.9 ppb
2017-07-171640091941.0 ppb
2017-07-171640092041.0 ppb
2017-07-171640092539.6 ppb
2017-07-171640092639.6 ppb
2017-08-01165520680.700 ppb
2017-08-01165517560.600 ppb
2017-08-0116551808ND
2017-08-01165518601.50 ppb
2017-08-01165519120.800 ppb
2017-08-011655212025.0 ppb
2017-08-0116552016ND
2017-08-01165519640.600 ppb
2017-08-17165529900.800 ppb
2017-08-1716553042ND
2017-08-1716553094ND
2017-08-17165531460.500 ppb
2017-08-171655319822.0 ppb
2017-08-17165532500.900 ppb
2017-08-2416552858ND
2017-08-2416552702ND
2017-08-2416552754ND
2017-08-2416552806ND
2017-08-24165529100.600 ppb
2017-10-161686816819.2 ppb
2017-10-161686816919.2 ppb
2017-10-161686818012.6 ppb
2017-10-161686818112.6 ppb
2017-10-161686819236.3 ppb
2017-10-161686819336.3 ppb
2017-10-161686820437.2 ppb
2017-10-161686820537.2 ppb
2018-01-16AF740173.60 ppb
2018-01-16AF740173.60 ppb
2018-01-16AF740184.50 ppb
2018-01-16AF740184.50 ppb
2018-01-16AF7401913.9 ppb
2018-01-16AF7401913.9 ppb
2018-01-16AF7402025.7 ppb
2018-01-16AF7402025.7 ppb
2018-01-29L6996345-1ND
2018-04-12AF815218.30 ppb
2018-04-12AF815218.30 ppb
2018-04-12AF8152211.8 ppb
2018-04-12AF8152211.8 ppb
2018-04-12AF8152323.8 ppb
2018-04-12AF8152323.8 ppb
2018-04-12AF8152426.1 ppb
2018-04-12AF8152426.1 ppb
2018-07-168019105-0123.4 ppb
2018-07-168019105-0224.3 ppb
2018-07-168019105-0339.5 ppb
2018-07-168019105-0451.0 ppb
2018-10-298031829-0113.5 ppb
2018-10-298031829-0217.9 ppb
2018-10-298031829-0337.2 ppb
2018-10-298031829-0444.5 ppb
2019-01-189002396-019.30 ppb
2019-01-189002396-0212.5 ppb
2019-01-189002396-0322.5 ppb
2019-01-189002396-0427.2 ppb
2019-04-109010343-019.70 ppb
2019-04-109010343-0213.2 ppb
2019-04-109010343-0317.0 ppb
2019-04-109010343-0421.0 ppb
2019-07-159023336-0126.9 ppb
2019-07-159023336-0217.6 ppb
2019-07-159023336-0340.4 ppb
2019-07-159023336-0441.8 ppb
2019-10-159035467-0111.3 ppb
2019-10-159035467-0213.1 ppb
2019-10-159035467-0326.8 ppb
2019-10-159035467-04RE66.8 ppb