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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Pamlico County Water

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

 

68

Samples

0

Samples exceeding legal limit (MCL)

60

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20142.49 ppb169ND - 7.00 ppb
20157.50 ppb1211ND - 25.0 ppb
20167.02 ppb443.88 ppb - 11.5 ppb
201714.3 ppb883.93 ppb - 41.5 ppb
20187.28 ppb16163.00 ppb - 39.6 ppb
201914.0 ppb12124.00 ppb - 31.0 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
2014-01-2337729_14-02452ND
2014-01-2337729_14-02451ND
2014-01-2337729_14-02454ND
2014-01-2337729_14-02453ND
2014-04-1637729_14-110334.47 ppb
2014-04-1637729_14-110355.71 ppb
2014-04-1637729_14-110384.27 ppb
2014-04-1637729_14-11040ND
2014-07-1537729_14-21201ND
2014-07-1537729_14-212054.79 ppb
2014-07-1537729_14-212063.58 ppb
2014-07-1537729_14-21207ND
2014-10-1737729_14-323184.00 ppb
2014-10-1737729_14-323197.00 ppb
2014-10-1737729_14-323204.00 ppb
2014-10-1737729_14-323252.00 ppb
2015-01-254.00 ppb
2015-01-254.00 ppb
2015-01-2525.0 ppb
2015-01-256.00 ppb
2015-04-288.21 ppb
2015-04-281.28 ppb
2015-04-2811.9 ppb
2015-04-282.64 ppb
2015-07-2111.0 ppb
2015-07-21ND
2015-07-217.00 ppb
2015-07-219.00 ppb
2016-07-1937729_16-242956.86 ppb
2016-07-1937729_16-242965.89 ppb
2016-07-1937729_16-2429711.5 ppb
2016-07-1937729_16-242983.88 ppb
2017-07-1737729_17-251936.31 ppb
2017-07-1737729_17-251894.72 ppb
2017-07-1737729_17-251923.93 ppb
2017-07-1937729_17-251944.99 ppb
2017-12-0637729_17-4637111.8 ppb
2017-12-0637729_17-4637314.3 ppb
2017-12-0637729_17-4637441.5 ppb
2017-12-0637729_17-4637527.3 ppb
2018-01-1937729_18-03340 3.12 ppb
2018-01-1937729_18-03339 3.88 ppb
2018-01-1937729_18-03338 6.68 ppb
2018-01-1937729_18-03337 6.90 ppb
2018-05-1537729_18-19499 5.93 ppb
2018-05-1537729_18-19496 4.39 ppb
2018-05-1537729_18-19497 39.6 ppb
2018-05-1537729_18-19498 6.91 ppb
2018-07-1137729_18-28425 4.36 ppb
2018-07-1137729_18-28426 3.79 ppb
2018-07-1137729_18-28427 3.76 ppb
2018-07-1137729_18-28428 3.21 ppb
2018-10-0137729_18-41463 3.00 ppb
2018-10-0137729_18-41464 7.00 ppb
2018-10-0137729_18-41465 7.00 ppb
2018-10-0137729_18-41466 7.00 ppb
2019-01-2837729_19-04453A 15.0 ppb
2019-01-2837729_19-04458A 4.00 ppb
2019-01-2837729_19-04459A 11.0 ppb
2019-01-2837729_19-04460A 21.0 ppb
2019-04-0537729_19-14080 4.31 ppb
2019-04-0537729_19-14082 15.7 ppb
2019-04-0537729_19-14081 10.1 ppb
2019-04-0537729_19-14079 10.9 ppb
2019-07-2337729_19-31387 31.0 ppb
2019-07-2337729_19-31386 9.00 ppb
2019-07-2337729_19-31385 9.00 ppb
2019-07-2337729_19-31384 27.0 ppb