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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

City of Manteca

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.

 

197

Samples

0

Samples exceeding legal limit (MCL)

168

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201220.6 ppb138ND - 48.0 ppb
201324.5 ppb3732ND - 56.0 ppb
201418.9 ppb3832ND - 38.0 ppb
201523.5 ppb3732ND - 63.0 ppb
201626.0 ppb3632ND - 63.0 ppb
201741.2 ppb3632ND - 69.0 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
2012-02-085810-040-1035ND
2012-02-085810-049-1130ND
2012-03-135810-013-1000ND
2012-06-125810-049-0717ND
2012-10-045810-900-081522.0 ppb
2012-10-045810-901-083548.0 ppb
2012-10-045810-902-085019.0 ppb
2012-10-045810-903-09304.40 ppb
2012-10-045810-904-100047.0 ppb
2012-10-045810-905-090540.0 ppb
2012-10-045810-906-094545.0 ppb
2012-10-045810-907-092043.0 ppb
2012-11-135810-044-1033ND
2013-01-035810-900-084512.0 ppb
2013-01-035810-901-091529.0 ppb
2013-01-035810-902-100512.0 ppb
2013-01-035810-903-102512.0 ppb
2013-01-035810-904-092526.0 ppb
2013-01-035810-905-095520.0 ppb
2013-01-035810-906-101524.0 ppb
2013-01-035810-907-094024.0 ppb
2013-03-135810-032-0640ND
2013-04-025810-900-144122.0 ppb
2013-04-025810-901-143156.0 ppb
2013-04-025810-902-130520.0 ppb
2013-04-025810-903-152318.0 ppb
2013-04-025810-904-141136.0 ppb
2013-04-025810-905-145645.0 ppb
2013-04-025810-906-115842.0 ppb
2013-04-025810-907-114543.0 ppb
2013-04-105810-012-0805ND
2013-06-055810-034-0825ND
2013-06-055810-038-0745ND
2013-07-035810-900-075524.0 ppb
2013-07-035810-901-074546.0 ppb
2013-07-035810-902-080522.0 ppb
2013-07-035810-903-084519.0 ppb
2013-07-035810-904-073525.0 ppb
2013-07-035810-905-081534.0 ppb
2013-07-035810-906-082541.0 ppb
2013-07-035810-907-072040.0 ppb
2013-08-145810-014-0810ND
2013-10-015810-900-094920.0 ppb
2013-10-015810-901-093741.0 ppb
2013-10-015810-902-102020.0 ppb
2013-10-015810-903-110418.0 ppb
2013-10-015810-904-081824.0 ppb
2013-10-015810-905-103029.0 ppb
2013-10-015810-906-105131.0 ppb
2013-10-015810-907-090933.0 ppb
2014-01-065810-900-101010.00 ppb
2014-01-065810-901-102037.0 ppb
2014-01-065810-902-09504.20 ppb
2014-01-065810-903-092018.0 ppb
2014-01-065810-904-104531.0 ppb
2014-01-065810-905-10005.80 ppb
2014-01-075810-906-093531.0 ppb
2014-01-075810-907-103528.0 ppb
2014-01-145810-036-0906ND
2014-01-145810-042-1055ND
2014-02-115810-030-0835ND
2014-04-015810-900-091020.0 ppb
2014-04-015810-901-085134.0 ppb
2014-04-015810-902-093515.0 ppb
2014-04-015810-903-094916.0 ppb
2014-04-015810-904-103633.0 ppb
2014-04-015810-905-102225.0 ppb
2014-04-015810-906-100530.0 ppb
2014-04-015810-907-105729.0 ppb
2014-06-105810-015-0720ND
2014-07-015810-900-094615.0 ppb
2014-07-015810-901-100329.0 ppb
2014-07-015810-902-103012.0 ppb
2014-07-015810-903-111113.0 ppb
2014-07-015810-904-075917.0 ppb
2014-07-015810-905-104519.0 ppb
2014-07-015810-906-084622.0 ppb
2014-07-015810-907-090522.0 ppb
2014-07-085810-016-0715ND
2014-07-085810-028-0803ND
2014-10-075810-900-095013.0 ppb
2014-10-075810-901-093538.0 ppb
2014-10-075810-902-101617.0 ppb
2014-10-075810-903-104517.0 ppb
2014-10-075810-904-110134.0 ppb
2014-10-075810-905-100429.0 ppb
2014-10-075810-906-102628.0 ppb
2014-10-075810-907-091926.0 ppb
2015-01-065810-900-103313.0 ppb
2015-01-065810-901-104525.0 ppb
2015-01-065810-902-101017.0 ppb
2015-01-065810-903-095812.0 ppb
2015-01-065810-904-110425.0 ppb
2015-01-065810-905-102022.0 ppb
2015-01-065810-906-094525.0 ppb
2015-01-065810-907-105323.0 ppb
2015-02-105810-040-0820ND
2015-04-075810-900-115017.0 ppb
2015-04-075810-901-120035.0 ppb
2015-04-075810-902-112716.0 ppb
2015-04-075810-903-110213.0 ppb
2015-04-075810-904-122328.0 ppb
2015-04-075810-905-11383.90 ppb
2015-04-075810-906-111425.0 ppb
2015-04-075810-907-121523.0 ppb
2015-06-095810-049-0650ND
2015-07-075810-900-084023.0 ppb
2015-07-075810-901-090728.0 ppb
2015-07-075810-902-093316.0 ppb
2015-07-075810-903-095719.0 ppb
2015-07-075810-904-101431.0 ppb
2015-07-075810-905-092227.0 ppb
2015-07-075810-906-094440.0 ppb
2015-07-075810-907-081939.0 ppb
2015-07-215810-034-0812ND
2015-10-075810-900-091035.0 ppb
2015-10-075810-901-085563.0 ppb
2015-10-075810-902-082527.0 ppb
2015-10-075810-903-080019.0 ppb
2015-10-075810-904-092555.0 ppb
2015-10-075810-905-084033.0 ppb
2015-10-075810-906-072548.0 ppb
2015-10-075810-907-094045.0 ppb
2015-11-305810-044-1005ND
2015-12-095810-013-0625ND
2016-01-055810-900-08055.30 ppb
2016-01-055810-901-082912.0 ppb
2016-01-055810-902-08572.90 ppb
2016-01-055810-903-093813.0 ppb
2016-01-055810-904-104413.0 ppb
2016-01-055810-905-100111.0 ppb
2016-01-055810-906-113125.0 ppb
2016-01-055810-907-105928.0 ppb
2016-03-085810-032-0540ND
2016-04-055810-900-095127.0 ppb
2016-04-055810-901-110425.0 ppb
2016-04-055810-902-100522.0 ppb
2016-04-055810-903-103331.0 ppb
2016-04-055810-904-074156.0 ppb
2016-04-055810-905-101812.0 ppb
2016-04-055810-906-084338.0 ppb
2016-04-055810-907-080942.0 ppb
2016-04-195810-012-0920ND
2016-06-145810-038-0645ND
2016-07-065810-900-074719.0 ppb
2016-07-065810-901-080633.0 ppb
2016-07-065810-902-072724.0 ppb
2016-07-065810-903-090129.0 ppb
2016-07-065810-904-094726.0 ppb
2016-07-065810-905-083622.0 ppb
2016-07-065810-906-070439.0 ppb
2016-07-065810-907-092642.0 ppb
2016-08-235810-014-0715ND
2016-10-045810-900-091827.0 ppb
2016-10-045810-901-093363.0 ppb
2016-10-045810-902-095133.0 ppb
2016-10-045810-903-102239.0 ppb
2016-10-045810-904-114451.0 ppb
2016-10-045810-905-115924.0 ppb
2016-10-045810-906-064555.0 ppb
2016-10-045810-907-104045.0 ppb
2017-01-035810-900-082025.0 ppb
2017-01-035810-901-074739.0 ppb
2017-01-035810-902-080820.0 ppb
2017-01-035810-903-083843.0 ppb
2017-01-035810-904-073432.0 ppb
2017-01-035810-905-075742.0 ppb
2017-01-035810-906-055037.0 ppb
2017-01-035810-907-062034.0 ppb
2017-04-045810-042-0535ND
2017-04-045810-900-092156.0 ppb
2017-04-045810-901-093453.0 ppb
2017-04-045810-902-095349.0 ppb
2017-04-045810-903-103336.0 ppb
2017-04-045810-904-082940.0 ppb
2017-04-045810-905-094469.0 ppb
2017-04-045810-906-062560.0 ppb
2017-04-045810-907-055551.0 ppb
2017-07-035810-900-091964.0 ppb
2017-07-035810-901-090063.0 ppb
2017-07-035810-902-094939.0 ppb
2017-07-035810-903-103050.0 ppb
2017-07-035810-904-083961.0 ppb
2017-07-035810-905-094158.0 ppb
2017-07-035810-906-105456.0 ppb
2017-07-035810-907-111057.0 ppb
2017-07-105810-016-0800ND
2017-07-105810-028-0847ND
2017-08-085810-015-0625ND
2017-10-025810-900-100043.0 ppb
2017-10-025810-901-101138.0 ppb
2017-10-025810-902-102042.0 ppb
2017-10-025810-903-103035.0 ppb
2017-10-025810-904-111231.0 ppb
2017-10-025810-905-105340.0 ppb
2017-10-035810-906-090560.0 ppb
2017-10-035810-907-093061.0 ppb