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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Ayersville Water and Sewer District

NOTE: Ayersville Water and Sewer District purchases water from Defiance City which is required to test for chloroform. Sample information shown below was taken by Defiance 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.

 

100

Samples

0

Samples exceeding legal limit (MCL)

100

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201246.2 ppb4425.0 ppb - 93.2 ppb
201341.2 ppb4416.5 ppb - 94.9 ppb
201435.2 ppb7716.0 ppb - 59.7 ppb
201536.3 ppb8817.7 ppb - 79.5 ppb
201652.8 ppb8830.7 ppb - 82.4 ppb
201756.1 ppb8842.7 ppb - 78.6 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

NOTE: Ayersville Water and Sewer District purchases water from Defiance City which is required to test for chloroform. Sample information shown below was taken by Defiance City.

Date Lab ID Result
2012-01-1012-10448-0125.3 ppb
2012-01-1012-10448-0226.7 ppb
2012-01-1012-10448-0324.4 ppb
2012-01-1012-10448-0443.3 ppb
2012-01-1012-10448-05B16.0 ppb
2012-04-1012-13996-0118.5 ppb
2012-04-1012-13996-0215.6 ppb
2012-04-1012-13996-0333.8 ppb
2012-04-1012-13996-0453.6 ppb
2012-07-1012-18181-0459.4 ppb
2012-07-1012-18181-0565.3 ppb
2012-07-1012-18181-0661.8 ppb
2012-07-1012-18181-0780.0 ppb
2012-10-0912-22946-0137.6 ppb
2012-10-0912-22946-0237.7 ppb
2012-10-0912-22946-0357.4 ppb
2012-10-0912-22946-0477.3 ppb
2013-01-0813-10384-0143.2 ppb
2013-01-0813-10383-03B18.0 ppb
2013-01-0813-10384-0227.5 ppb
2013-01-0813-10384-0320.1 ppb
2013-01-0813-10384-0434.5 ppb
2013-02-2213-12229-0114.0 ppb
2013-04-0913-14332-0137.6 ppb
2013-04-0913-14332-0236.0 ppb
2013-04-0913-14332-0323.9 ppb
2013-04-0913-14332-0434.2 ppb
2013-07-0913-18860-0991.6 ppb
2013-07-0913-18860-1068.6 ppb
2013-07-0913-18860-1159.8 ppb
2013-07-0913-18860-1273.9 ppb
2013-10-0813-23674-0540.0 ppb
2013-10-0813-23674-0449.4 ppb
2013-10-0813-23674-0663.3 ppb
2013-10-0813-23674-0387.4 ppb
2014-01-1414-10538-0626.6 ppb
2014-01-1414-10538-0721.7 ppb
2014-01-1414-10538-0817.6 ppb
2014-01-1414-10538-0922.3 ppb
2014-04-0814-14258-0528.9 ppb
2014-04-0814-14258-0630.8 ppb
2014-04-0814-14258-0717.5 ppb
2014-04-0814-14258-0820.9 ppb
2014-07-0814-18905-0348.2 ppb
2014-07-0814-18905-0184.3 ppb
2014-07-0814-18905-0259.7 ppb
2014-07-0814-18905-0455.2 ppb
2014-10-1014-24076-0332.5 ppb
2014-10-1014-24076-0447.1 ppb
2014-10-1014-24076-0166.1 ppb
2014-10-1014-24076-0254.5 ppb
2014-10-1714-24386-0146.7 ppb
2015-01-0915-10318-0129.0 ppb
2015-01-0915-10318-0225.4 ppb
2015-01-0915-10318-0314.8 ppb
2015-01-0915-10318-0423.4 ppb
2015-04-1015-14526-0138.1 ppb
2015-04-1015-14526-0234.2 ppb
2015-04-1015-14526-0323.0 ppb
2015-04-1015-14526-0428.4 ppb
2015-07-1015-19630-0452.1 ppb
2015-07-1015-19630-0524.5 ppb
2015-07-1015-19630-0624.1 ppb
2015-07-1015-19630-0733.2 ppb
2015-10-0915-24931-0144.2 ppb
2015-10-0915-24931-0231.5 ppb
2015-10-0915-24931-0328.5 ppb
2015-10-0915-24931-0436.3 ppb
2016-01-1116-10444-0133.7 ppb
2016-01-1116-10444-0221.4 ppb
2016-01-1116-10444-0320.3 ppb
2016-01-1116-10444-0429.1 ppb
2016-04-1116-15095-0130.0 ppb
2016-04-1116-15095-0220.9 ppb
2016-04-1116-15095-0320.6 ppb
2016-04-1116-15095-0426.4 ppb
2016-07-1116-20506-0157.6 ppb
2016-07-1116-20506-0229.7 ppb
2016-07-1116-20506-0321.9 ppb
2016-07-1116-20506-0440.0 ppb
2016-10-1016-27056-0156.0 ppb
2016-10-1016-27056-0224.7 ppb
2016-10-1016-27056-0320.1 ppb
2016-10-1016-27056-0436.6 ppb
2017-01-0917-10462-0128.8 ppb
2017-01-0917-10462-0249.9 ppb
2017-01-0917-10462-0324.0 ppb
2017-01-0917-10462-0434.9 ppb
2017-04-1017-16159-0135.0 ppb
2017-04-1017-16159-0247.7 ppb
2017-04-1017-16159-0326.8 ppb
2017-04-1017-16159-0429.3 ppb
2017-07-1117-22547-0139.9 ppb
2017-07-1117-22547-0344.7 ppb
2017-07-1117-22547-0447.7 ppb
2017-07-11M17-22547-0275.2 ppb
2017-10-1017-29634-0145.6 ppb
2017-10-1017-29634-0270.5 ppb
2017-10-1017-29634-0317.5 ppb
2017-10-1017-29634-0446.3 ppb