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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

United Water Pennsylvania

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.

 

220

Samples

0

Samples exceeding legal limit (MCL)

217

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201236.1 ppb3532ND - 100.0 ppb
201334.9 ppb32328.29 ppb - 95.3 ppb
201435.6 ppb33333.60 ppb - 74.3 ppb
201537.0 ppb40405.00 ppb - 105.0 ppb
201642.8 ppb40406.60 ppb - 84.7 ppb
201745.3 ppb40406.00 ppb - 103.0 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
2012-02-08441 CAMERON14.8 ppb
2012-02-08CD EAST ADMN11.1 ppb
2012-02-08DAUPHIN VOTE18.7 ppb
2012-02-08HUMMELSTOWN6.51 ppb
2012-02-08SHERATON HOT9.27 ppb
2012-02-08OLMSTEAD PLAND
2012-02-0841 CEYMORE S9.95 ppb
2012-02-08118 PLEASANT12.0 ppb
2012-02-08SCHUYKILL ST21.2 ppb
2012-05-08441 CAMERON50.7 ppb
2012-05-08CD ADMIN BLD47.3 ppb
2012-05-08DAUPHIN VO T29.0 ppb
2012-05-08HUMMELSTOWN25.1 ppb
2012-05-08SHERATON HOT34.9 ppb
2012-05-08OLMSTEAD PLAND
2012-05-0841 CEYMORE S42.1 ppb
2012-05-08118 PLEASANT45.4 ppb
2012-05-08SCHUYKILL ST45.7 ppb
2012-08-09441 CAMERON41.2 ppb
2012-08-09CD ADMIN BLD54.1 ppb
2012-08-09DAUPHIN VOTE32.7 ppb
2012-08-09HUMMELSTOWN65.6 ppb
2012-08-09SHERATON HOT98.8 ppb
2012-08-09OLMSTED PLAZND
2012-08-0941 CEYMORE S100.0 ppb
2012-08-09118 PLEASANT84.1 ppb
2012-08-09SCHUYKILL ST35.6 ppb
2012-11-08BUCKINGHAM R33.7 ppb
2012-11-08L&N BEVERAGE39.0 ppb
2012-11-08CEYMORE ST47.0 ppb
2012-11-08FOREST HILL51.5 ppb
2012-11-08DEVON MANOR44.3 ppb
2012-11-08EDGEMONT FIR34.4 ppb
2012-11-08SHERTON LIND55.1 ppb
2012-11-08OBERLIN BOOS23.7 ppb
2013-02-11BUCKINGHAM R10.00 ppb
2013-02-11L&N BEVERAGE13.9 ppb
2013-02-11CEYMORE ST11.7 ppb
2013-02-11FOREST HILL34.8 ppb
2013-02-11DEVON MANOR18.2 ppb
2013-02-11EDGEMONT FIR11.8 ppb
2013-02-11SHERTON LIND15.4 ppb
2013-02-11OBERLIN BOOS8.29 ppb
2013-05-08BUCKINGHAM R34.4 ppb
2013-05-08L&N BEVERAGE40.8 ppb
2013-05-08CEYMORE ST34.6 ppb
2013-05-08FOREST HILLS51.9 ppb
2013-05-08DEVON MANOR47.1 ppb
2013-05-08EDGEMONT FIR45.6 ppb
2013-05-08SHERATON LIN48.1 ppb
2013-05-08OBERLIN BOOS28.5 ppb
2013-08-08BUCKINGHAM R65.9 ppb
2013-08-08L&N BEVERAGE41.5 ppb
2013-08-08CEYMORE ST53.3 ppb
2013-08-08FOREST HILLS95.3 ppb
2013-08-08DEVON MANOR57.1 ppb
2013-08-08EDGEMONT FIR67.0 ppb
2013-08-08SHERATON LIN52.8 ppb
2013-08-08OBERLIN BOOS38.8 ppb
2013-11-07BUCKINGHAM R32.4 ppb
2013-11-07L&N BEVERAGE20.1 ppb
2013-11-07CEYMORE ST33.7 ppb
2013-11-07FOREST HILLS32.2 ppb
2013-11-07DEVON MANOR12.9 ppb
2013-11-07EDGEMONT FIR16.6 ppb
2013-11-07SHERATON LIN26.5 ppb
2013-11-07OBERLIN BOOS16.7 ppb
2014-02-11107134600113.3 ppb
2014-02-1110713460026.60 ppb
2014-02-11107134600315.6 ppb
2014-02-11107134600424.6 ppb
2014-02-1110713460056.70 ppb
2014-02-1110713460064.60 ppb
2014-02-11107134600713.2 ppb
2014-02-1110713460083.60 ppb
2014-05-09200607800130.0 ppb
2014-05-09200607800238.9 ppb
2014-05-09200607800329.8 ppb
2014-05-09200607800456.1 ppb
2014-05-09200607800543.3 ppb
2014-05-09200607800644.5 ppb
2014-05-09200607800734.0 ppb
2014-05-09200607800823.3 ppb
2014-08-11202271600126.1 ppb
2014-08-11202271600264.4 ppb
2014-08-11202271600325.8 ppb
2014-08-11202271600458.7 ppb
2014-08-11202271600565.5 ppb
2014-08-11202271600637.8 ppb
2014-08-11202271600753.0 ppb
2014-08-11202271600839.3 ppb
2014-11-10203916500153.8 ppb
2014-11-10203916500238.0 ppb
2014-11-10203916500344.2 ppb
2014-11-10203916500474.3 ppb
2014-11-10203916500540.3 ppb
2014-11-10203916500641.6 ppb
2014-11-10203916500744.4 ppb
2014-11-10203916500820.8 ppb
2014-12-01204244700158.4 ppb
2015-01-051236860138.6 ppb
2015-02-09124815078.70 ppb
2015-02-09124815136.40 ppb
2015-02-09124815199.40 ppb
2015-02-091248152514.5 ppb
2015-02-091248153112.6 ppb
2015-02-09124815376.40 ppb
2015-02-091248154310.6 ppb
2015-02-09124815495.00 ppb
2015-03-091259740615.0 ppb
2015-04-011259741236.9 ppb
2015-05-111284424325.1 ppb
2015-05-111284424943.1 ppb
2015-05-111284425523.3 ppb
2015-05-111284426173.6 ppb
2015-05-111284426749.4 ppb
2015-05-111284427350.2 ppb
2015-05-111284427935.7 ppb
2015-05-111284428544.3 ppb
2015-06-031284429887.1 ppb
2015-07-0613101921105.0 ppb
2015-08-101322807638.3 ppb
2015-08-101322808224.3 ppb
2015-08-101322808833.3 ppb
2015-08-101322809489.2 ppb
2015-08-101322810044.7 ppb
2015-08-101322810640.4 ppb
2015-08-101322811241.3 ppb
2015-08-101322811838.3 ppb
2015-09-011322819557.4 ppb
2015-10-061347743935.9 ppb
2015-11-091359871032.0 ppb
2015-11-091359871629.4 ppb
2015-11-091359872223.0 ppb
2015-11-091359872851.7 ppb
2015-11-091359873437.0 ppb
2015-11-091359874029.0 ppb
2015-11-091359874644.0 ppb
2015-11-091359875232.2 ppb
2015-12-071371824659.4 ppb
2016-01-081383673436.5 ppb
2016-02-081395169410.6 ppb
2016-02-081395170020.5 ppb
2016-02-08139517068.70 ppb
2016-02-081395171227.1 ppb
2016-02-081395171819.6 ppb
2016-02-081395172419.0 ppb
2016-02-08139517308.30 ppb
2016-02-08139517366.60 ppb
2016-03-011395168233.9 ppb
2016-04-041406717641.1 ppb
2016-05-091436230536.3 ppb
2016-05-091436232948.6 ppb
2016-05-091436229343.4 ppb
2016-05-091436231166.9 ppb
2016-05-091436229945.0 ppb
2016-05-091436228745.5 ppb
2016-05-091436231741.1 ppb
2016-05-091436232341.4 ppb
2016-06-061436234774.5 ppb
2016-07-051469099570.6 ppb
2016-08-081486068577.4 ppb
2016-08-081486066148.1 ppb
2016-08-081486069163.8 ppb
2016-08-081486067345.5 ppb
2016-08-081486067945.0 ppb
2016-08-081486069758.8 ppb
2016-08-081486070384.7 ppb
2016-08-081486066743.8 ppb
2016-09-121503338074.9 ppb
2016-10-131518670731.4 ppb
2016-11-091532937938.1 ppb
2016-11-091532939154.1 ppb
2016-11-091532935542.8 ppb
2016-11-091532937365.6 ppb
2016-11-091532939744.6 ppb
2016-11-091532936147.3 ppb
2016-11-091532936744.5 ppb
2016-11-091532938526.4 ppb
2016-12-051547472831.8 ppb
2017-01-111561758728.4 ppb
2017-02-08157545296.80 ppb
2017-02-081575454115.5 ppb
2017-02-08157545358.70 ppb
2017-02-081575451421.1 ppb
2017-02-081575455316.0 ppb
2017-02-081575454714.0 ppb
2017-02-08157545236.00 ppb
2017-02-08157545088.60 ppb
2017-03-061589536534.5 ppb
2017-04-041604919139.0 ppb
2017-05-101621128734.4 ppb
2017-05-101621126345.6 ppb
2017-05-101621126932.0 ppb
2017-05-101621128164.2 ppb
2017-05-101621125748.5 ppb
2017-05-101621124546.3 ppb
2017-05-101621125134.1 ppb
2017-05-101621127543.2 ppb
2017-06-051637204674.1 ppb
2017-07-061652282989.7 ppb
2017-08-101668301587.0 ppb
2017-08-101668298544.3 ppb
2017-08-101668300695.1 ppb
2017-08-1016682994103.0 ppb
2017-08-101668300358.3 ppb
2017-08-101668297259.1 ppb
2017-08-101668297889.7 ppb
2017-08-101668299062.9 ppb
2017-09-111683794175.3 ppb
2017-10-041683804748.5 ppb
2017-11-091712307931.2 ppb
2017-11-091712309754.0 ppb
2017-11-091712307340.7 ppb
2017-11-091712310345.7 ppb
2017-11-091712308537.8 ppb
2017-11-091712309154.1 ppb
2017-11-091712306734.4 ppb
2017-11-091712310930.5 ppb
2017-12-041712326248.2 ppb