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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

United Water Toms River

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

 

199

Samples

0

Samples exceeding legal limit (MCL)

192

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20142.30 ppb32320.520 ppb - 11.0 ppb
20151.71 ppb3935ND - 6.60 ppb
20162.65 ppb3231ND - 9.79 ppb
20172.14 ppb3231ND - 8.78 ppb
20183.12 ppb32320.690 ppb - 18.5 ppb
20195.23 ppb32320.980 ppb - 16.7 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
2014-02-03A160881.28 ppb
2014-02-03A160831.21 ppb
2014-02-03A160841.36 ppb
2014-02-03A160721.55 ppb
2014-02-03A160860.780 ppb
2014-02-03A160850.940 ppb
2014-02-03A160871.38 ppb
2014-02-03A160731.10 ppb
2014-05-05A165182.00 ppb
2014-05-05A165163.67 ppb
2014-05-05A165151.45 ppb
2014-05-05A165177.77 ppb
2014-05-05A165140.730 ppb
2014-05-05A1651911.0 ppb
2014-05-05A165131.06 ppb
2014-05-05A165122.52 ppb
2014-08-05A172062.21 ppb
2014-08-05A172053.73 ppb
2014-08-05A172221.30 ppb
2014-08-05A172202.61 ppb
2014-08-05A172180.520 ppb
2014-08-05A172211.39 ppb
2014-08-05A172231.43 ppb
2014-08-05A172191.78 ppb
2014-11-03A177213.13 ppb
2014-11-03A177152.61 ppb
2014-11-03A177141.26 ppb
2014-11-03A177203.94 ppb
2014-11-03A177190.880 ppb
2014-11-03A177182.54 ppb
2014-11-03A177171.12 ppb
2014-11-03A177163.40 ppb
2015-02-02A183350.970 ppb
2015-02-02A183360.780 ppb
2015-02-02A183340.980 ppb
2015-02-02A183391.83 ppb
2015-02-02A183370.440 ppb
2015-02-02A183330.850 ppb
2015-02-02A183380.920 ppb
2015-02-02A183211.17 ppb
2015-05-04D80071.57 ppb
2015-05-04A189741.03 ppb
2015-05-04A189721.25 ppb
2015-05-04A189754.56 ppb
2015-05-04D80090.710 ppb
2015-05-04D80102.47 ppb
2015-05-04D80081.30 ppb
2015-05-04A189731.16 ppb
2015-06-1620771570011.80 ppb
2015-06-162077157002ND
2015-06-162077157003ND
2015-06-162077157004ND
2015-06-1620771570056.40 ppb
2015-06-262079496001ND
2015-06-2620794960020.720 ppb
2015-08-0420874800041.000 ppb
2015-08-0420874800083.50 ppb
2015-08-0420874800022.70 ppb
2015-08-0420874800056.60 ppb
2015-08-0420874800010.570 ppb
2015-08-0420874800063.10 ppb
2015-08-0420874800071.50 ppb
2015-08-0420874800031.90 ppb
2015-11-0421059710081.80 ppb
2015-11-0421059710074.80 ppb
2015-11-0421059710061.30 ppb
2015-11-0421059710051.50 ppb
2015-11-0421059710040.680 ppb
2015-11-0421059710031.90 ppb
2015-11-0421059710021.20 ppb
2015-11-0421059710011.70 ppb
2016-02-0421224410080.850 ppb
2016-02-0421224410070.950 ppb
2016-02-0421224410060.640 ppb
2016-02-0421224410055.10 ppb
2016-02-042122441004ND
2016-02-0421224410033.80 ppb
2016-02-0421224410021.60 ppb
2016-02-0421224410012.20 ppb
2016-05-04A214741.43 ppb
2016-05-04A214689.79 ppb
2016-05-04A214691.27 ppb
2016-05-04A214704.00 ppb
2016-05-04A214710.560 ppb
2016-05-04A214721.04 ppb
2016-05-04A214751.12 ppb
2016-05-04A214731.26 ppb
2016-08-02A221242.14 ppb
2016-08-02A221216.03 ppb
2016-08-02A221231.55 ppb
2016-08-02A221208.45 ppb
2016-08-02A221220.720 ppb
2016-08-02A221254.16 ppb
2016-08-02A221262.08 ppb
2016-08-02A221193.08 ppb
2016-11-01A227231.85 ppb
2016-11-01A227220.370 ppb
2016-11-01A227191.16 ppb
2016-11-01A227189.48 ppb
2016-11-01A227200.600 ppb
2016-11-01A227243.36 ppb
2016-11-01A227170.910 ppb
2016-11-01A227213.18 ppb
2017-02-01A232711.07 ppb
2017-02-01A232750.910 ppb
2017-02-01A232760.950 ppb
2017-02-01A232681.02 ppb
2017-02-01A232700.520 ppb
2017-02-01A232740.930 ppb
2017-02-01A232671.30 ppb
2017-02-01A232690.820 ppb
2017-05-02A238501.81 ppb
2017-05-02A238492.42 ppb
2017-05-02A238521.12 ppb
2017-05-02A238628.09 ppb
2017-05-02A238510.710 ppb
2017-05-02A238462.31 ppb
2017-05-02A238481.92 ppb
2017-05-02A238473.60 ppb
2017-08-01A244721.48 ppb
2017-08-01A244718.78 ppb
2017-08-01A244692.07 ppb
2017-08-01A244685.92 ppb
2017-08-01A24467ND
2017-08-01A244662.65 ppb
2017-08-01A244652.19 ppb
2017-08-01A244642.11 ppb
2017-11-01A251032.22 ppb
2017-11-01A251021.70 ppb
2017-11-01A251101.24 ppb
2017-11-01A251112.25 ppb
2017-11-01A251210.700 ppb
2017-11-01A250982.30 ppb
2017-11-01A250971.76 ppb
2017-11-01A251201.69 ppb
2018-02-01A256171.47 ppb
2018-02-01A256127.36 ppb
2018-02-01A256131.47 ppb
2018-02-01A256142.61 ppb
2018-02-01A256110.690 ppb
2018-02-01A256185.23 ppb
2018-02-01A256151.81 ppb
2018-02-01A256161.29 ppb
2018-05-02A261592.57 ppb
2018-05-02A261601.93 ppb
2018-05-02A261641.67 ppb
2018-05-02A261616.10 ppb
2018-05-02A261620.960 ppb
2018-05-02A261651.68 ppb
2018-05-02A261580.740 ppb
2018-05-02A261631.69 ppb
2018-08-01A268062.25 ppb
2018-08-01A2680514.2 ppb
2018-08-01A268041.51 ppb
2018-08-01A268038.38 ppb
2018-08-01A268020.760 ppb
2018-08-01A2680118.5 ppb
2018-08-01A268001.93 ppb
2018-08-01A267992.74 ppb
2018-11-01A275301.08 ppb
2018-11-01A275290.760 ppb
2018-11-01A275281.45 ppb
2018-11-01A275272.47 ppb
2018-11-01A275260.750 ppb
2018-11-01A275251.56 ppb
2018-11-01A275241.26 ppb
2018-11-01A275230.990 ppb
2019-02-01A280392.06 ppb
2019-02-01A280361.49 ppb
2019-02-01A280351.01 ppb
2019-02-01A280498.92 ppb
2019-02-01A280370.980 ppb
2019-02-01A280381.58 ppb
2019-02-01A280501.64 ppb
2019-02-01A280482.29 ppb
2019-05-02A285992.09 ppb
2019-05-02A2859810.4 ppb
2019-05-02A285971.46 ppb
2019-05-02A2859610.7 ppb
2019-05-02A285951.33 ppb
2019-05-02A2859416.2 ppb
2019-05-02A285935.74 ppb
2019-05-02A285922.72 ppb
2019-08-01A291822.31 ppb
2019-08-01A2918111.1 ppb
2019-08-01A291802.25 ppb
2019-08-01A291797.15 ppb
2019-08-01A291781.19 ppb
2019-08-01A2917716.7 ppb
2019-08-01A291762.24 ppb
2019-08-01A291752.96 ppb
2019-11-01A298543.79 ppb
2019-11-01A2985315.1 ppb
2019-11-01A298521.71 ppb
2019-11-01A298512.37 ppb
2019-11-01A298501.28 ppb
2019-11-01A298496.86 ppb
2019-11-01A2984816.3 ppb
2019-11-01A298473.58 ppb