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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Avon Water Company

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

 

242

Samples

0

Samples exceeding legal limit (MCL)

82

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.250 ppb4814ND - 1.40 ppb
20150.166 ppb4810ND - 1.40 ppb
20160.290 ppb4817ND - 1.70 ppb
20170.302 ppb4815ND - 2.40 ppb
20180.605 ppb2615ND - 1.60 ppb
20190.554 ppb2411ND - 2.40 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
2014-01-16E401A25-1TTHMND
2014-01-16E401A25-2TTHM0.630 ppb
2014-01-16E401A25-3TTHM0.870 ppb
2014-01-16E401A25-4TTHM0.610 ppb
2014-01-16E402153-8VOCND
2014-02-04E402153-1VOCND
2014-02-04E402153-2VOCND
2014-02-04E402153-3VOCND
2014-02-04E402153-4VOCND
2014-02-04E402153-5VOCND
2014-02-04E402153-6VOCND
2014-02-04E402153-7VOCND
2014-04-15E404E43-1TTHM0.530 ppb
2014-04-15E404E43-2TTHM0.820 ppb
2014-04-15E404E43-3TTHMND
2014-04-15E404E43-4TTHM0.590 ppb
2014-05-14E405C29-1VOCND
2014-05-14E405C29-2VOCND
2014-05-14E405C29-3VOCND
2014-05-14E405C29-4VOCND
2014-05-14E405C29-5VOCND
2014-05-14E405C29-6VOCND
2014-05-14E405C29-7VOCND
2014-05-14E405C29-8VOCND
2014-07-14E407C09-1GE0.730 ppb
2014-07-14E407C09-2GE0.760 ppb
2014-07-14E407C09-3GE1.20 ppb
2014-07-14E407C09-4GE0.640 ppb
2014-08-13E408C10-1VOCND
2014-08-13E408C10-2VOCND
2014-08-13E408C10-3VOCND
2014-08-13E408C10-4VOCND
2014-08-13E408C10-5VOCND
2014-08-13E408C10-6VOCND
2014-08-13E408C10-7VOCND
2014-08-13E408C10-8VOCND
2014-10-16E410F41-1TTHM1.10 ppb
2014-10-16E410F41-2TTHM1.20 ppb
2014-10-16E410F41-3TTHM0.910 ppb
2014-10-16E410F41-4TTHM1.40 ppb
2014-11-21E411H72-1VOCND
2014-11-21E411H72-2VOCND
2014-11-21E411H72-3VOCND
2014-11-21E411H72-4VOCND
2014-11-21E411H72-6VOCND
2014-11-21E411H72-7VOCND
2014-11-21E411H72-8VOCND
2014-12-08E412718-2VOCND
2015-01-15E501A25-1TTHMND
2015-01-15E501A25-2TTHM0.580 ppb
2015-01-15E501A25-4TTHM0.650 ppb
2015-01-15E501A25-3TTHMND
2015-02-18E502D21-4VOCND
2015-02-19E502D21-2VOCND
2015-02-19E502D21-3VOCND
2015-02-19E502D21-6VOCND
2015-02-19E502D21-7VOCND
2015-02-19E502D21-8VOCND
2015-02-19E502D21-9VOCND
2015-02-20E502D21-1VOCND
2015-04-14E504E21-1TTHM0.620 ppb
2015-04-14E504E21-2TTHM0.620 ppb
2015-04-14E504E21-3TTHMND
2015-04-14E504E21-4TTHMND
2015-06-10E506B81-1VOCND
2015-06-10E506B81-2VOCND
2015-06-10E506B81-3VOCND
2015-06-10E506B81-4VOCND
2015-06-10E506B81-5VOCND
2015-06-10E506B81-6VOCND
2015-06-10E506B81-7VOCND
2015-06-10E506B81-8VOCND
2015-07-15E507G94-2TTHM0.610 ppb
2015-07-15E507G94-3TTHM0.910 ppb
2015-07-15E507G94-1TTHMND
2015-07-15E507G94-4TTHMND
2015-08-28E508Y67-1VOCND
2015-08-28E508Y67-2VOCND
2015-08-28E508Y67-3VOCND
2015-08-28E508Y67-4VOCND
2015-08-28E508Y67-5VOCND
2015-08-28E508Y67-6VOCND
2015-08-28E508Y67-7VOCND
2015-08-28E508Y67-8VOCND
2015-10-15E510E91-2TTHM1.000 ppb
2015-10-15E510E91-1TTHM0.960 ppb
2015-10-15E510E91-4TTHMND
2015-10-15E510E91-3TTHM1.40 ppb
2015-11-24E511O25-1VOCND
2015-11-24E511O25-2VOCND
2015-11-24E511O25-3VOCND
2015-11-24E511O25-4VOCND
2015-11-24E511O25-5VOC0.610 ppb
2015-11-24E511O25-6VOCND
2015-11-24E511O25-7VOCND
2015-11-24E511O25-8VOCND
2016-01-15E601D17-1TTHM0.700 ppb
2016-01-15E601D17-2TTHM0.630 ppb
2016-01-15E601D17-3TTHM0.570 ppb
2016-01-15E601D17-4TTHMND
2016-02-18E602H93-1VOCND
2016-02-18E602H93-2VOCND
2016-02-18E602H93-3VOCND
2016-02-18E602H93-4VOCND
2016-02-18E602H93-5VOCND
2016-02-18E602H93-6VOCND
2016-02-18E602H93-7VOCND
2016-02-18E602H93-8VOCND
2016-04-19E605079-1TTHM0.730 ppb
2016-04-19E605079-2TTHM0.720 ppb
2016-04-19E605079-3TTHM0.700 ppb
2016-04-19E605079-4TTHM0.910 ppb
2016-05-19E605N95-1VOCND
2016-05-19E605N95-2VOCND
2016-05-19E605N95-3VOCND
2016-05-19E605N95-4VOCND
2016-05-19E605N95-5VOC0.630 ppb
2016-05-19E605N95-6VOCND
2016-05-19E605N95-7VOCND
2016-05-19E605N95-8VOCND
2016-07-13E607C00-1TTHM1.70 ppb
2016-07-13E607C00-2TTHM0.900 ppb
2016-07-13E607C00-3TTHM0.880 ppb
2016-07-13E607C00-4TTHMND
2016-08-05E608889-1VOCND
2016-08-05E608889-2VOCND
2016-08-05E608889-3VOCND
2016-08-05E608889-4VOCND
2016-08-05E608889-5VOCND
2016-08-05E608889-6VOCND
2016-08-05E608889-7VOCND
2016-08-05E608889-8VOCND
2016-10-14E610G73-1TTHM1.000 ppb
2016-10-14E610G73-2TTHM0.990 ppb
2016-10-14E610G73-3TTHM0.880 ppb
2016-10-14E610G73-4TTHM0.650 ppb
2016-11-21E611M57-1VOCND
2016-11-21E611M57-2VOCND
2016-11-21E611M57-3VOCND
2016-11-21E611M57-4VOC0.750 ppb
2016-11-21E611M57-5VOC0.570 ppb
2016-11-21E611M57-6VOCND
2016-11-21E611M57-7VOCND
2016-11-21E611M57-8VOCND
2017-01-13E701C67-1TTHM0.600 ppb
2017-01-13E701C67-2TTHM0.550 ppb
2017-01-13E701C67-3TTHMND
2017-01-13E701C67-4TTHM0.830 ppb
2017-02-24E702M07-1VOCND
2017-02-24E702M07-2VOCND
2017-02-24E702M07-3VOCND
2017-02-24E702M07-4VOCND
2017-02-24E702M07-5VOCND
2017-02-24E702M07-6VOCND
2017-02-24E702M07-7VOCND
2017-02-24E702M07-8VOCND
2017-04-13D7D1107-01VOC0.600 ppb
2017-04-13D7D1107-02VOC0.900 ppb
2017-04-13D7D1107-03VOCND
2017-04-13D7D1107-04VOC0.900 ppb
2017-06-01D7F0171-01VOCND
2017-06-01D7F0171-02VOCND
2017-06-01D7F0171-03VOCND
2017-06-01D7F0171-04VOCND
2017-06-01D7F0171-05VOCND
2017-06-01D7F0171-06VOCND
2017-06-01D7F0171-07VOCND
2017-06-01D7F0171-08VOCND
2017-07-14D7G1331-01VOC0.900 ppb
2017-07-14D7G1331-02VOC2.40 ppb
2017-07-14D7G1331-03VOC1.20 ppb
2017-07-14D7G1331-04VOC0.600 ppb
2017-08-29D7H3264-01VOCND
2017-08-29D7H3264-02VOCND
2017-08-29D7H3264-03VOCND
2017-08-29D7H3264-04VOCND
2017-08-29D7H3264-05VOCND
2017-08-29D7H3264-06VOCND
2017-08-29D7H3264-07VOCND
2017-08-29D7H3264-08VOCND
2017-10-13D7J1362-01VOC1.30 ppb
2017-10-13D7J1362-02VOC1.40 ppb
2017-10-13D7J1362-03VOC0.900 ppb
2017-10-13D7J1362-04VOC0.800 ppb
2017-11-28D7K2247-02VOCND
2017-11-28D7K2247-03VOCND
2017-11-28D7K2247-04VOCND
2017-11-28D7K2247-05VOC0.600 ppb
2017-11-28D7K2247-06VOCND
2017-11-28D7K2247-07VOCND
2017-11-28D7K2247-08VOCND
2017-11-28D7K2247-01VOCRND
2018-01-24D8A1669-01VOC0.700 ppb
2018-01-24D8A1669-02VOC0.800 ppb
2018-01-24D8A1669-03VOC1.000 ppb
2018-01-24D8A1669-04VOC0.500 ppb
2018-03-05D8C0238-02VOCND
2018-03-05D8C0238-03VOCND
2018-03-05D8C0238-04VOCND
2018-03-05D8C0238-05VOC0.800 ppb
2018-03-05D8C0238-06VOCND
2018-03-05D8C0238-07VOCND
2018-03-05D8C0238-08VOCND
2018-04-25D8D2151-08VOCND
2018-04-25D8D2151-09VOC1.10 ppb
2018-04-25D8D2151-10VOC0.900 ppb
2018-04-25D8D2151-11VOC1.20 ppb
2018-04-25D8D2151-07VOCND
2018-07-26CA98743ND
2018-07-26CA987441.40 ppb
2018-07-26CA987450.540 ppb
2018-07-26CA987461.40 ppb
2018-07-26CA98747ND
2018-10-09DBP 2005086641.30 ppb
2018-10-09DBP 2005086651.30 ppb
2018-10-09DBP 2005086761.60 ppb
2018-10-09DBP 2005086781.20 ppb
2018-10-09VOC1 200508699ND
2019-01-08DBP 2005181310.700 ppb
2019-01-08DBP 200518132ND
2019-01-08DBP 2005181330.500 ppb
2019-01-08DBP 200518135ND
2019-01-29VOC1 200519992ND
2019-01-29VOC1 200519993ND
2019-01-29VOC1 200519991ND
2019-01-29VOC1 200519996ND
2019-01-29VOC1 200519994ND
2019-01-29VOC1 200519995ND
2019-04-11DBP 2005282670.800 ppb
2019-04-11DBP 2005282681.40 ppb
2019-04-11DBP 2005282691.10 ppb
2019-04-11DBP 2005282701.10 ppb
2019-04-16VOC1 200528742ND
2019-07-02DBP 200538992ND
2019-07-02DBP 2005389931.50 ppb
2019-07-02DBP 200538995ND
2019-07-02DBP 2005389961.20 ppb
2019-08-13VOC1 200544842ND
2019-10-03DBP 200551429ND
2019-10-03DBP 2005514302.40 ppb
2019-10-03DBP 2005514311.20 ppb
2019-10-03DBP 2005514321.40 ppb