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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | 0.250 ppb | 48 | 14 | ND - 1.40 ppb |
2015 | 0.166 ppb | 48 | 10 | ND - 1.40 ppb |
2016 | 0.290 ppb | 48 | 17 | ND - 1.70 ppb |
2017 | 0.302 ppb | 48 | 15 | ND - 2.40 ppb |
2018 | 0.605 ppb | 26 | 15 | ND - 1.60 ppb |
2019 | 0.554 ppb | 24 | 11 | ND - 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 |
---|---|---|
2014-01-16 | E401A25-1TTHM | ND |
2014-01-16 | E401A25-2TTHM | 0.630 ppb |
2014-01-16 | E401A25-3TTHM | 0.870 ppb |
2014-01-16 | E401A25-4TTHM | 0.610 ppb |
2014-01-16 | E402153-8VOC | ND |
2014-02-04 | E402153-1VOC | ND |
2014-02-04 | E402153-2VOC | ND |
2014-02-04 | E402153-3VOC | ND |
2014-02-04 | E402153-4VOC | ND |
2014-02-04 | E402153-5VOC | ND |
2014-02-04 | E402153-6VOC | ND |
2014-02-04 | E402153-7VOC | ND |
2014-04-15 | E404E43-1TTHM | 0.530 ppb |
2014-04-15 | E404E43-2TTHM | 0.820 ppb |
2014-04-15 | E404E43-3TTHM | ND |
2014-04-15 | E404E43-4TTHM | 0.590 ppb |
2014-05-14 | E405C29-1VOC | ND |
2014-05-14 | E405C29-2VOC | ND |
2014-05-14 | E405C29-3VOC | ND |
2014-05-14 | E405C29-4VOC | ND |
2014-05-14 | E405C29-5VOC | ND |
2014-05-14 | E405C29-6VOC | ND |
2014-05-14 | E405C29-7VOC | ND |
2014-05-14 | E405C29-8VOC | ND |
2014-07-14 | E407C09-1GE | 0.730 ppb |
2014-07-14 | E407C09-2GE | 0.760 ppb |
2014-07-14 | E407C09-3GE | 1.20 ppb |
2014-07-14 | E407C09-4GE | 0.640 ppb |
2014-08-13 | E408C10-1VOC | ND |
2014-08-13 | E408C10-2VOC | ND |
2014-08-13 | E408C10-3VOC | ND |
2014-08-13 | E408C10-4VOC | ND |
2014-08-13 | E408C10-5VOC | ND |
2014-08-13 | E408C10-6VOC | ND |
2014-08-13 | E408C10-7VOC | ND |
2014-08-13 | E408C10-8VOC | ND |
2014-10-16 | E410F41-1TTHM | 1.10 ppb |
2014-10-16 | E410F41-2TTHM | 1.20 ppb |
2014-10-16 | E410F41-3TTHM | 0.910 ppb |
2014-10-16 | E410F41-4TTHM | 1.40 ppb |
2014-11-21 | E411H72-1VOC | ND |
2014-11-21 | E411H72-2VOC | ND |
2014-11-21 | E411H72-3VOC | ND |
2014-11-21 | E411H72-4VOC | ND |
2014-11-21 | E411H72-6VOC | ND |
2014-11-21 | E411H72-7VOC | ND |
2014-11-21 | E411H72-8VOC | ND |
2014-12-08 | E412718-2VOC | ND |
2015-01-15 | E501A25-1TTHM | ND |
2015-01-15 | E501A25-2TTHM | 0.580 ppb |
2015-01-15 | E501A25-4TTHM | 0.650 ppb |
2015-01-15 | E501A25-3TTHM | ND |
2015-02-18 | E502D21-4VOC | ND |
2015-02-19 | E502D21-2VOC | ND |
2015-02-19 | E502D21-3VOC | ND |
2015-02-19 | E502D21-6VOC | ND |
2015-02-19 | E502D21-7VOC | ND |
2015-02-19 | E502D21-8VOC | ND |
2015-02-19 | E502D21-9VOC | ND |
2015-02-20 | E502D21-1VOC | ND |
2015-04-14 | E504E21-1TTHM | 0.620 ppb |
2015-04-14 | E504E21-2TTHM | 0.620 ppb |
2015-04-14 | E504E21-3TTHM | ND |
2015-04-14 | E504E21-4TTHM | ND |
2015-06-10 | E506B81-1VOC | ND |
2015-06-10 | E506B81-2VOC | ND |
2015-06-10 | E506B81-3VOC | ND |
2015-06-10 | E506B81-4VOC | ND |
2015-06-10 | E506B81-5VOC | ND |
2015-06-10 | E506B81-6VOC | ND |
2015-06-10 | E506B81-7VOC | ND |
2015-06-10 | E506B81-8VOC | ND |
2015-07-15 | E507G94-2TTHM | 0.610 ppb |
2015-07-15 | E507G94-3TTHM | 0.910 ppb |
2015-07-15 | E507G94-1TTHM | ND |
2015-07-15 | E507G94-4TTHM | ND |
2015-08-28 | E508Y67-1VOC | ND |
2015-08-28 | E508Y67-2VOC | ND |
2015-08-28 | E508Y67-3VOC | ND |
2015-08-28 | E508Y67-4VOC | ND |
2015-08-28 | E508Y67-5VOC | ND |
2015-08-28 | E508Y67-6VOC | ND |
2015-08-28 | E508Y67-7VOC | ND |
2015-08-28 | E508Y67-8VOC | ND |
2015-10-15 | E510E91-2TTHM | 1.000 ppb |
2015-10-15 | E510E91-1TTHM | 0.960 ppb |
2015-10-15 | E510E91-4TTHM | ND |
2015-10-15 | E510E91-3TTHM | 1.40 ppb |
2015-11-24 | E511O25-1VOC | ND |
2015-11-24 | E511O25-2VOC | ND |
2015-11-24 | E511O25-3VOC | ND |
2015-11-24 | E511O25-4VOC | ND |
2015-11-24 | E511O25-5VOC | 0.610 ppb |
2015-11-24 | E511O25-6VOC | ND |
2015-11-24 | E511O25-7VOC | ND |
2015-11-24 | E511O25-8VOC | ND |
2016-01-15 | E601D17-1TTHM | 0.700 ppb |
2016-01-15 | E601D17-2TTHM | 0.630 ppb |
2016-01-15 | E601D17-3TTHM | 0.570 ppb |
2016-01-15 | E601D17-4TTHM | ND |
2016-02-18 | E602H93-1VOC | ND |
2016-02-18 | E602H93-2VOC | ND |
2016-02-18 | E602H93-3VOC | ND |
2016-02-18 | E602H93-4VOC | ND |
2016-02-18 | E602H93-5VOC | ND |
2016-02-18 | E602H93-6VOC | ND |
2016-02-18 | E602H93-7VOC | ND |
2016-02-18 | E602H93-8VOC | ND |
2016-04-19 | E605079-1TTHM | 0.730 ppb |
2016-04-19 | E605079-2TTHM | 0.720 ppb |
2016-04-19 | E605079-3TTHM | 0.700 ppb |
2016-04-19 | E605079-4TTHM | 0.910 ppb |
2016-05-19 | E605N95-1VOC | ND |
2016-05-19 | E605N95-2VOC | ND |
2016-05-19 | E605N95-3VOC | ND |
2016-05-19 | E605N95-4VOC | ND |
2016-05-19 | E605N95-5VOC | 0.630 ppb |
2016-05-19 | E605N95-6VOC | ND |
2016-05-19 | E605N95-7VOC | ND |
2016-05-19 | E605N95-8VOC | ND |
2016-07-13 | E607C00-1TTHM | 1.70 ppb |
2016-07-13 | E607C00-2TTHM | 0.900 ppb |
2016-07-13 | E607C00-3TTHM | 0.880 ppb |
2016-07-13 | E607C00-4TTHM | ND |
2016-08-05 | E608889-1VOC | ND |
2016-08-05 | E608889-2VOC | ND |
2016-08-05 | E608889-3VOC | ND |
2016-08-05 | E608889-4VOC | ND |
2016-08-05 | E608889-5VOC | ND |
2016-08-05 | E608889-6VOC | ND |
2016-08-05 | E608889-7VOC | ND |
2016-08-05 | E608889-8VOC | ND |
2016-10-14 | E610G73-1TTHM | 1.000 ppb |
2016-10-14 | E610G73-2TTHM | 0.990 ppb |
2016-10-14 | E610G73-3TTHM | 0.880 ppb |
2016-10-14 | E610G73-4TTHM | 0.650 ppb |
2016-11-21 | E611M57-1VOC | ND |
2016-11-21 | E611M57-2VOC | ND |
2016-11-21 | E611M57-3VOC | ND |
2016-11-21 | E611M57-4VOC | 0.750 ppb |
2016-11-21 | E611M57-5VOC | 0.570 ppb |
2016-11-21 | E611M57-6VOC | ND |
2016-11-21 | E611M57-7VOC | ND |
2016-11-21 | E611M57-8VOC | ND |
2017-01-13 | E701C67-1TTHM | 0.600 ppb |
2017-01-13 | E701C67-2TTHM | 0.550 ppb |
2017-01-13 | E701C67-3TTHM | ND |
2017-01-13 | E701C67-4TTHM | 0.830 ppb |
2017-02-24 | E702M07-1VOC | ND |
2017-02-24 | E702M07-2VOC | ND |
2017-02-24 | E702M07-3VOC | ND |
2017-02-24 | E702M07-4VOC | ND |
2017-02-24 | E702M07-5VOC | ND |
2017-02-24 | E702M07-6VOC | ND |
2017-02-24 | E702M07-7VOC | ND |
2017-02-24 | E702M07-8VOC | ND |
2017-04-13 | D7D1107-01VOC | 0.600 ppb |
2017-04-13 | D7D1107-02VOC | 0.900 ppb |
2017-04-13 | D7D1107-03VOC | ND |
2017-04-13 | D7D1107-04VOC | 0.900 ppb |
2017-06-01 | D7F0171-01VOC | ND |
2017-06-01 | D7F0171-02VOC | ND |
2017-06-01 | D7F0171-03VOC | ND |
2017-06-01 | D7F0171-04VOC | ND |
2017-06-01 | D7F0171-05VOC | ND |
2017-06-01 | D7F0171-06VOC | ND |
2017-06-01 | D7F0171-07VOC | ND |
2017-06-01 | D7F0171-08VOC | ND |
2017-07-14 | D7G1331-01VOC | 0.900 ppb |
2017-07-14 | D7G1331-02VOC | 2.40 ppb |
2017-07-14 | D7G1331-03VOC | 1.20 ppb |
2017-07-14 | D7G1331-04VOC | 0.600 ppb |
2017-08-29 | D7H3264-01VOC | ND |
2017-08-29 | D7H3264-02VOC | ND |
2017-08-29 | D7H3264-03VOC | ND |
2017-08-29 | D7H3264-04VOC | ND |
2017-08-29 | D7H3264-05VOC | ND |
2017-08-29 | D7H3264-06VOC | ND |
2017-08-29 | D7H3264-07VOC | ND |
2017-08-29 | D7H3264-08VOC | ND |
2017-10-13 | D7J1362-01VOC | 1.30 ppb |
2017-10-13 | D7J1362-02VOC | 1.40 ppb |
2017-10-13 | D7J1362-03VOC | 0.900 ppb |
2017-10-13 | D7J1362-04VOC | 0.800 ppb |
2017-11-28 | D7K2247-02VOC | ND |
2017-11-28 | D7K2247-03VOC | ND |
2017-11-28 | D7K2247-04VOC | ND |
2017-11-28 | D7K2247-05VOC | 0.600 ppb |
2017-11-28 | D7K2247-06VOC | ND |
2017-11-28 | D7K2247-07VOC | ND |
2017-11-28 | D7K2247-08VOC | ND |
2017-11-28 | D7K2247-01VOCR | ND |
2018-01-24 | D8A1669-01VOC | 0.700 ppb |
2018-01-24 | D8A1669-02VOC | 0.800 ppb |
2018-01-24 | D8A1669-03VOC | 1.000 ppb |
2018-01-24 | D8A1669-04VOC | 0.500 ppb |
2018-03-05 | D8C0238-02VOC | ND |
2018-03-05 | D8C0238-03VOC | ND |
2018-03-05 | D8C0238-04VOC | ND |
2018-03-05 | D8C0238-05VOC | 0.800 ppb |
2018-03-05 | D8C0238-06VOC | ND |
2018-03-05 | D8C0238-07VOC | ND |
2018-03-05 | D8C0238-08VOC | ND |
2018-04-25 | D8D2151-08VOC | ND |
2018-04-25 | D8D2151-09VOC | 1.10 ppb |
2018-04-25 | D8D2151-10VOC | 0.900 ppb |
2018-04-25 | D8D2151-11VOC | 1.20 ppb |
2018-04-25 | D8D2151-07VOC | ND |
2018-07-26 | CA98743 | ND |
2018-07-26 | CA98744 | 1.40 ppb |
2018-07-26 | CA98745 | 0.540 ppb |
2018-07-26 | CA98746 | 1.40 ppb |
2018-07-26 | CA98747 | ND |
2018-10-09 | DBP 200508664 | 1.30 ppb |
2018-10-09 | DBP 200508665 | 1.30 ppb |
2018-10-09 | DBP 200508676 | 1.60 ppb |
2018-10-09 | DBP 200508678 | 1.20 ppb |
2018-10-09 | VOC1 200508699 | ND |
2019-01-08 | DBP 200518131 | 0.700 ppb |
2019-01-08 | DBP 200518132 | ND |
2019-01-08 | DBP 200518133 | 0.500 ppb |
2019-01-08 | DBP 200518135 | ND |
2019-01-29 | VOC1 200519992 | ND |
2019-01-29 | VOC1 200519993 | ND |
2019-01-29 | VOC1 200519991 | ND |
2019-01-29 | VOC1 200519996 | ND |
2019-01-29 | VOC1 200519994 | ND |
2019-01-29 | VOC1 200519995 | ND |
2019-04-11 | DBP 200528267 | 0.800 ppb |
2019-04-11 | DBP 200528268 | 1.40 ppb |
2019-04-11 | DBP 200528269 | 1.10 ppb |
2019-04-11 | DBP 200528270 | 1.10 ppb |
2019-04-16 | VOC1 200528742 | ND |
2019-07-02 | DBP 200538992 | ND |
2019-07-02 | DBP 200538993 | 1.50 ppb |
2019-07-02 | DBP 200538995 | ND |
2019-07-02 | DBP 200538996 | 1.20 ppb |
2019-08-13 | VOC1 200544842 | ND |
2019-10-03 | DBP 200551429 | ND |
2019-10-03 | DBP 200551430 | 2.40 ppb |
2019-10-03 | DBP 200551431 | 1.20 ppb |
2019-10-03 | DBP 200551432 | 1.40 ppb |