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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Aqua Water Supply Corporation

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

 

146

Samples

0

Samples exceeding legal limit (MCL)

123

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.88 ppb19191.60 ppb - 6.00 ppb
20152.92 ppb2722ND - 8.60 ppb
20163.05 ppb2420ND - 10.5 ppb
20173.15 ppb2521ND - 12.0 ppb
20183.16 ppb2720ND - 13.9 ppb
20193.50 ppb2421ND - 11.1 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
2014-02-05AC414991.60 ppb
2014-02-05AC415012.10 ppb
2014-03-10AC462183.40 ppb
2014-03-10AC462152.80 ppb
2014-03-10AC462141.70 ppb
2014-03-10AC462162.50 ppb
2014-04-14AC503493.60 ppb
2014-04-14AC503952.50 ppb
2014-04-14AC503562.30 ppb
2014-04-14AC503942.70 ppb
2014-08-13AC635734.60 ppb
2014-08-13AC635611.80 ppb
2014-08-13AC635642.30 ppb
2014-08-13AC635623.20 ppb
2014-08-13AC634091.70 ppb
2014-10-22AC703086.00 ppb
2014-10-22AC703093.20 ppb
2014-10-22AC703122.30 ppb
2014-10-22AC703134.50 ppb
2015-02-09AC79746ND
2015-02-09AC79750ND
2015-02-09AC797445.20 ppb
2015-02-09AC797421.70 ppb
2015-02-09AC79752ND
2015-02-09AC797485.00 ppb
2015-02-09AC796848.40 ppb
2015-02-09AC796853.00 ppb
2015-02-09AC796872.50 ppb
2015-02-09AC796862.60 ppb
2015-02-10AC79973ND
2015-02-10AC79985ND
2015-02-10AC799811.80 ppb
2015-02-10AC799831.000 ppb
2015-02-10AC799771.10 ppb
2015-04-13AC879568.60 ppb
2015-04-13AC879592.00 ppb
2015-04-13AC879572.00 ppb
2015-04-14AC880992.10 ppb
2015-07-10AC990307.70 ppb
2015-07-10AC990292.50 ppb
2015-07-10AC990312.10 ppb
2015-07-10AC990283.60 ppb
2015-10-15AD108047.90 ppb
2015-10-15AD108032.50 ppb
2015-10-15AD108051.60 ppb
2015-10-15AD108063.90 ppb
2016-01-26AD201242.80 ppb
2016-01-26AD201202.00 ppb
2016-01-26AD20122ND
2016-01-26AD20138ND
2016-01-26AD20130ND
2016-01-26AD201181.000 ppb
2016-01-26AD201161.40 ppb
2016-01-26AD20134ND
2016-01-26AD200656.70 ppb
2016-01-26AD200492.10 ppb
2016-01-26AD200531.80 ppb
2016-01-26AD200592.70 ppb
2016-04-19AD334459.20 ppb
2016-04-19AD334441.30 ppb
2016-04-19AD334431.70 ppb
2016-04-19AD334423.60 ppb
2016-07-26AD4564410.5 ppb
2016-07-26AD456571.90 ppb
2016-07-26AD456561.30 ppb
2016-07-26AD456414.00 ppb
2016-10-18AD535468.80 ppb
2016-10-18AD535442.90 ppb
2016-10-18AD535472.20 ppb
2016-10-18AD535535.30 ppb
2017-01-11AD643363.10 ppb
2017-01-11AD643222.00 ppb
2017-01-11AD643341.40 ppb
2017-01-11AD643321.40 ppb
2017-01-11AD642832.00 ppb
2017-01-11AD642821.40 ppb
2017-01-12AD647761.50 ppb
2017-01-12AD64782ND
2017-01-12AD64786ND
2017-01-12AD64780ND
2017-01-12AD64778ND
2017-01-12AD647057.90 ppb
2017-01-12AD647061.90 ppb
2017-04-05AD785288.40 ppb
2017-04-05AD785262.60 ppb
2017-04-05AD785212.10 ppb
2017-04-05AD785233.20 ppb
2017-09-18AD9650910.6 ppb
2017-09-18AD965051.90 ppb
2017-09-18AD965041.50 ppb
2017-09-18AD965085.10 ppb
2017-10-25AE0207712.0 ppb
2017-10-25AE020762.20 ppb
2017-10-25AE020911.90 ppb
2017-10-25AE020784.60 ppb
2018-01-25AE10604ND
2018-01-25AE10548ND
2018-01-25AE10554ND
2018-01-25AE105423.30 ppb
2018-01-25AE106241.70 ppb
2018-01-25AE10610ND
2018-01-25AE10546ND
2018-01-25AE10620ND
2018-01-25AE105521.70 ppb
2018-01-25AE105447.80 ppb
2018-01-25AE10550ND
2018-01-25AE105047.40 ppb
2018-01-25AE104921.60 ppb
2018-01-25AE104781.30 ppb
2018-01-25AE105233.40 ppb
2018-04-09AE216229.40 ppb
2018-04-09AE216262.00 ppb
2018-04-09AE216322.40 ppb
2018-04-09AE216273.90 ppb
2018-08-24AE384136.60 ppb
2018-08-24AE384071.80 ppb
2018-08-24AE384111.70 ppb
2018-08-24AE384125.10 ppb
2018-10-16AE4358813.9 ppb
2018-10-16AE435892.70 ppb
2018-10-16AE435901.30 ppb
2018-10-16AE435916.20 ppb
2019-03-15AE585295.90 ppb
2019-03-15AE585311.90 ppb
2019-03-15AE585281.40 ppb
2019-03-15AE585302.30 ppb
2019-05-15AE665203.30 ppb
2019-05-15AE665261.50 ppb
2019-05-15AE66528ND
2019-05-15AE665182.10 ppb
2019-05-15AE665221.30 ppb
2019-05-15AE665241.30 ppb
2019-05-15AE665302.50 ppb
2019-05-15AE6653210.00 ppb
2019-05-15AE664688.10 ppb
2019-05-15AE664842.10 ppb
2019-05-15AE66470ND
2019-05-15AE664713.60 ppb
2019-08-16AE7910411.1 ppb
2019-08-16AE791052.10 ppb
2019-08-16AE79107ND
2019-08-16AE791084.10 ppb
2019-11-15AE8934111.0 ppb
2019-11-15AE893382.50 ppb
2019-11-15AE893401.10 ppb
2019-11-15AE893394.80 ppb