Chloroform
East Orange Water Commission
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 | 9.74 ppb | 170 | 34 | ND - 72.0 ppb |
2015 | 21.3 ppb | 86 | 34 | ND - 71.4 ppb |
2016 | 35.5 ppb | 44 | 40 | ND - 71.0 ppb |
2017 | 7.04 ppb | 35 | 34 | ND - 79.4 ppb |
2018 | 0.801 ppb | 32 | 32 | 0.439 ppb - 1.85 ppb |
2019 | 0.634 ppb | 34 | 34 | 0.252 ppb - 1.18 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 |
---|---|---|
2014-01-07 | 24913-1 | ND |
2014-01-09 | 24970-1 | ND |
2014-01-09 | 24970-2 | ND |
2014-01-14 | 25006-1 | ND |
2014-01-21 | 25140-1 | ND |
2014-01-28 | 25218-1 | ND |
2014-01-31 | 25276-1 | ND |
2014-01-31 | 25276-2 | ND |
2014-01-31 | 25276-5 | ND |
2014-01-31 | 25276-3 | ND |
2014-01-31 | 25276-4 | ND |
2014-02-06 | 25316-1 | ND |
2014-02-07 | 25337-1 | ND |
2014-02-07 | 25337-2 | ND |
2014-02-11 | 25394-1 | ND |
2014-02-18 | 25484-1 | ND |
2014-02-21 | 25559-2 | ND |
2014-02-21 | 25559-1 | ND |
2014-02-21 | 25559-3 | ND |
2014-02-21 | 25559-5 | ND |
2014-02-21 | 25559-4 | ND |
2014-02-25 | 25576-1 | ND |
2014-02-27 | 25627-8 | 38.6 ppb |
2014-02-27 | 25627-7 | 23.7 ppb |
2014-02-27 | 25627-6 | 37.4 ppb |
2014-02-27 | 25627-5 | 38.4 ppb |
2014-02-27 | 25627-4 | 37.4 ppb |
2014-02-27 | 25627-3 | 37.4 ppb |
2014-02-27 | 25627-2 | 35.9 ppb |
2014-02-27 | 25627-1 | 37.9 ppb |
2014-03-04 | 25672-1 | ND |
2014-03-06 | 25737-2 | ND |
2014-03-06 | 25737-3 | ND |
2014-03-06 | 25737-1 | ND |
2014-03-11 | 25775-1 | ND |
2014-03-13 | 25847-2 | ND |
2014-03-13 | 25847-1 | ND |
2014-03-14 | 25864-3 | ND |
2014-03-14 | 25864-4 | ND |
2014-03-14 | 25864-2 | ND |
2014-03-14 | 25864-1 | ND |
2014-03-18 | 25881-1 | ND |
2014-03-25 | 26003-1 | ND |
2014-03-25 | 26002-2 | ND |
2014-03-25 | 26002-3 | ND |
2014-03-25 | 26002-1 | ND |
2014-04-02 | 26091-1 | ND |
2014-04-10 | 26219-1 | ND |
2014-04-11 | 26230-1 | ND |
2014-04-15 | 26276-1 | ND |
2014-04-17 | 26318-2 | ND |
2014-04-17 | 26318-1 | ND |
2014-04-17 | 26317-1 | ND |
2014-04-17 | 26318-3 | ND |
2014-04-17 | 26318-4 | ND |
2014-04-17 | 26318-5 | ND |
2014-04-22 | 26360-1 | ND |
2014-04-24 | 26411-2 | ND |
2014-04-24 | 26411-1 | ND |
2014-04-29 | 26464-1 | ND |
2014-05-07 | 26577-1 | ND |
2014-05-08 | 26615-2 | ND |
2014-05-08 | 26615-1 | ND |
2014-05-08 | 26615-3 | ND |
2014-05-08 | 26615-4 | ND |
2014-05-08 | 26615-5 | ND |
2014-05-13 | 26667-1 | ND |
2014-05-14 | 26681-1 | ND |
2014-05-19 | 26759-1 | ND |
2014-05-21 | 26792-1 | ND |
2014-05-22 | 26819-4 | ND |
2014-05-22 | 26819-1 | ND |
2014-05-22 | 26819-2 | ND |
2014-05-22 | 26819-3 | ND |
2014-05-27 | 26878-1 | ND |
2014-05-30 | 26943-8 | 59.5 ppb |
2014-05-30 | 26943-7 | 57.5 ppb |
2014-05-30 | 26943-6 | 56.2 ppb |
2014-05-30 | 26943-5 | 46.4 ppb |
2014-05-30 | 26943-4 | 58.5 ppb |
2014-05-30 | 26943-3 | 60.0 ppb |
2014-05-30 | 26943-2 | 53.9 ppb |
2014-05-30 | 26943-1 | 57.8 ppb |
2014-06-09 | 27071-1 | ND |
2014-06-10 | 27097-1 | ND |
2014-06-10 | 27079-1 | ND |
2014-06-11 | 27122-1 | ND |
2014-06-12 | 27158-1 | ND |
2014-06-12 | 27158-2 | ND |
2014-06-12 | 27158-3 | ND |
2014-06-12 | 27158-4 | ND |
2014-06-12 | 27158-5 | ND |
2014-06-17 | 27241-1 | ND |
2014-06-19 | 27330-1 | ND |
2014-06-19 | 27331-1 | ND |
2014-06-19 | 27331-2 | ND |
2014-06-20 | 27346-1 | ND |
2014-06-20 | 27371-1 | ND |
2014-06-20 | 27371-2 | ND |
2014-06-24 | 27397-1 | ND |
2014-06-30 | 27523-1 | ND |
2014-07-10 | 27714-1 | ND |
2014-07-10 | 27713-1 | ND |
2014-07-10 | 27713-2 | ND |
2014-07-10 | 27713-3 | ND |
2014-07-15 | 27777-1 | ND |
2014-07-23 | 27976-1 | ND |
2014-07-28 | 28019-1 | ND |
2014-07-30 | 28095-1 | ND |
2014-07-31 | 28096-1 | ND |
2014-08-04 | 28121-1 | ND |
2014-08-05 | 28147-1 | ND |
2014-08-06 | DWS031-1 | ND |
2014-08-06 | DWS032-1 | ND |
2014-08-06 | DWS033-1 | ND |
2014-08-12 | 28234-1 | ND |
2014-08-19 | 28458-1 | ND |
2014-08-26 | 28543-1 | ND |
2014-08-27 | 28573-1 | ND |
2014-08-27 | 28573-2 | ND |
2014-08-27 | 28573-3 | ND |
2014-08-29 | 28621-8 | 64.7 ppb |
2014-08-29 | 28621-7 | 70.1 ppb |
2014-08-29 | 28621-6 | 60.3 ppb |
2014-08-29 | 28621-5 | 67.0 ppb |
2014-08-29 | 28621-4 | 70.8 ppb |
2014-08-29 | 28621-3 | 66.0 ppb |
2014-08-29 | 28621-2 | 56.7 ppb |
2014-08-29 | 28621-1 | 72.0 ppb |
2014-09-02 | 28651-1 | ND |
2014-09-08 | 28701-2 | ND |
2014-09-08 | 28701-1 | ND |
2014-09-10 | 28778-1 | ND |
2014-09-10 | 28777-1 | ND |
2014-09-12 | 28836-1 | ND |
2014-09-12 | 28835-1 | ND |
2014-09-15 | 28859-1 | ND |
2014-09-17 | 28911-1 | ND |
2014-09-18 | 28912-1 | ND |
2014-09-23 | 29005-1 | ND |
2014-10-07 | 29281-1 | ND |
2014-10-14 | 29393-1 | ND |
2014-10-21 | 29490-1 | ND |
2014-10-22 | 29541-1 | ND |
2014-10-23 | 29543-1 | ND |
2014-10-24 | 29585-1 | ND |
2014-10-27 | 29600-1 | ND |
2014-10-28 | 29598-1 | ND |
2014-10-28 | 29599-1 | ND |
2014-11-03 | 29679-1 | ND |
2014-11-10 | 29769-1 | ND |
2014-11-10 | 29768-1 | ND |
2014-11-14 | 29897-1 | 0.600 ppb |
2014-11-17 | 29909-1 | ND |
2014-11-19 | 29963-1 | ND |
2014-11-24 | 30038-1 | ND |
2014-11-26 | 30067-8 | 59.9 ppb |
2014-11-26 | 30067-7 | 59.5 ppb |
2014-11-26 | 30067-6 | 51.3 ppb |
2014-11-26 | 30067-5 | 45.4 ppb |
2014-11-26 | 30067-4 | 11.8 ppb |
2014-11-26 | 30067-3 | 58.7 ppb |
2014-11-26 | 30067-2 | 43.9 ppb |
2014-11-26 | 30067-1 | 59.3 ppb |
2014-12-02 | 30114-1 | ND |
2014-12-09 | 30243-1 | ND |
2014-12-16 | 30355-1 | ND |
2014-12-23 | 30475-1 | ND |
2014-12-30 | 30555-1 | ND |
2014-12-30 | 30556-1 | 1.65 ppb |
2015-01-06 | 30599-1 | ND |
2015-01-07 | 30666-1 | ND |
2015-01-13 | 30753-1 | ND |
2015-01-13 | 30754-1 | ND |
2015-01-15 | 30803-1 | ND |
2015-01-21 | 30882-1 | ND |
2015-01-26 | 30938-1 | ND |
2015-02-05 | 31104-1 | ND |
2015-02-10 | 31146-1 | ND |
2015-02-20 | 31324-1 | ND |
2015-02-24 | 31365-1 | ND |
2015-02-26 | 31439-8 | 44.4 ppb |
2015-02-26 | 31439-7 | 43.1 ppb |
2015-02-26 | 31439-6 | 44.5 ppb |
2015-02-26 | 31439-5 | 40.8 ppb |
2015-02-26 | 31439-4 | 42.4 ppb |
2015-02-26 | 31439-3 | 41.9 ppb |
2015-02-26 | 31439-2 | 8.60 ppb |
2015-02-26 | 31439-1 | 40.6 ppb |
2015-03-03 | 31492-1 | ND |
2015-03-05 | 31545-2 | ND |
2015-03-05 | 31545-1 | ND |
2015-03-10 | 31593-1 | ND |
2015-03-20 | 31784-1 | ND |
2015-03-24 | 31820-1 | ND |
2015-04-01 | 31924-1 | ND |
2015-04-07 | DWS111-1 | ND |
2015-04-14 | DWS194-1 | ND |
2015-04-16 | DWS240-1 | ND |
2015-04-21 | DWS310-1 | ND |
2015-04-28 | DWS318-1 | ND |
2015-05-06 | DWS466-1 | ND |
2015-05-13 | DWS534-1 | ND |
2015-05-19 | DWS539-1 | ND |
2015-05-26 | DWS627-1 | ND |
2015-05-27 | DWS653-8 | 69.6 ppb |
2015-05-27 | DWS653-7 | 62.7 ppb |
2015-05-27 | DWS653-6 | 66.1 ppb |
2015-05-27 | DWS653-5 | 54.9 ppb |
2015-05-27 | DWS653-4 | 67.5 ppb |
2015-05-27 | DWS653-3 | 67.4 ppb |
2015-05-27 | DWS653-2 | 57.6 ppb |
2015-05-27 | DWS653-1 | 60.2 ppb |
2015-06-02 | DWS686-1 | ND |
2015-06-09 | DWS776-1 | ND |
2015-06-16 | DWS862-1 | ND |
2015-06-20 | DWS982-1 | ND |
2015-06-23 | DWS921-1 | ND |
2015-07-07 | DWS1065-1 | ND |
2015-07-14 | DWSC24-1 | ND |
2015-07-21 | DWSC67-1 | ND |
2015-07-21 | DWSC66-1 | ND |
2015-07-22 | DWSC72-1 | ND |
2015-07-28 | DWSC98-1 | ND |
2015-08-10 | DWSC166-1 | ND |
2015-08-18 | DWSC226-1 | 0.570 ppb |
2015-08-24 | DWSC264-1 | ND |
2015-08-25 | DWSC285-1 | ND |
2015-08-27 | DWSC296-8 | 67.2 ppb |
2015-08-27 | DWSC296-7 | 71.4 ppb |
2015-08-27 | DWSC296-6 | 67.0 ppb |
2015-08-27 | DWSC296-5 | 65.7 ppb |
2015-08-27 | DWSC296-4 | 68.7 ppb |
2015-08-27 | DWSC296-3 | 68.7 ppb |
2015-08-27 | DWSC296-2 | 48.5 ppb |
2015-08-27 | DWSC296-1 | 70.1 ppb |
2015-09-01 | DWSC303-1 | ND |
2015-09-08 | DWSC338-1 | ND |
2015-09-15 | DWSC383-1 | ND |
2015-10-06 | DWSC535-1 | ND |
2015-10-09 | DWSC574-1 | ND |
2015-10-13 | DWSC579-1 | ND |
2015-10-20 | DWSC628-1 | ND |
2015-10-22 | DWSC658-1 | ND |
2015-10-23 | DWSC681-1 | ND |
2015-10-27 | DWSC667-1 | ND |
2015-10-28 | DWSC682-1 | ND |
2015-11-30 | 5110804-08 | 64.7 ppb |
2015-11-30 | 5110804-07 | 60.4 ppb |
2015-11-30 | 5110804-06 | 64.2 ppb |
2015-11-30 | 5110804-05 | 61.1 ppb |
2015-11-30 | 5110804-04 | 68.2 ppb |
2015-11-30 | 5110804-03 | 60.2 ppb |
2015-11-30 | 5110804-02 | 51.1 ppb |
2015-11-30 | 5110804-01 | 63.5 ppb |
2015-12-29 | 5120772-01 | 0.863 ppb |
2016-02-29 | 6020735-08 | 47.9 ppb |
2016-02-29 | 6020735-07 | 46.8 ppb |
2016-02-29 | 6020735-06 | 52.0 ppb |
2016-02-29 | 6020735-05 | 47.7 ppb |
2016-02-29 | 6020735-04 | 39.7 ppb |
2016-02-29 | 6020735-03 | 46.9 ppb |
2016-02-29 | 6020735-02 | 33.5 ppb |
2016-02-29 | 6020735-01 | 37.6 ppb |
2016-03-08 | 6030253-01 | ND |
2016-03-15 | 6030466-01 | ND |
2016-03-23 | 6030717-01 | ND |
2016-03-29 | 6030898-01 | ND |
2016-05-31 | 6050904-08 | 60.6 ppb |
2016-05-31 | 6050904-07 | 58.0 ppb |
2016-05-31 | 6050904-06 | 59.9 ppb |
2016-05-31 | 6050904-05 | 57.3 ppb |
2016-05-31 | 6050904-04 | 60.1 ppb |
2016-05-31 | 6050904-03 | 51.6 ppb |
2016-05-31 | 6050904-02 | 45.9 ppb |
2016-05-31 | 6050904-01 | 52.4 ppb |
2016-06-21 | 6060623-01 | 0.255 ppb |
2016-07-19 | 6070486-01 | 0.264 ppb |
2016-08-02 | 6080055-01 | 0.264 ppb |
2016-08-05 | 6080198-01 | 0.274 ppb |
2016-08-05 | 6080197-01 | 0.298 ppb |
2016-08-08 | 6080240-01 | 0.312 ppb |
2016-08-18 | 6080665-01 | 0.865 ppb |
2016-08-30 | 6080942-08 | 56.0 ppb |
2016-08-30 | 6080942-07 | 59.9 ppb |
2016-08-30 | 6080942-06 | 49.8 ppb |
2016-08-30 | 6080942-05 | 53.8 ppb |
2016-08-30 | 6080942-04 | 67.2 ppb |
2016-08-30 | 6080942-03 | 53.8 ppb |
2016-08-30 | 6080942-02 | 38.6 ppb |
2016-08-30 | 6080942-01 | 71.0 ppb |
2016-09-02 | 6090073-01 | 0.372 ppb |
2016-11-17 | 6110559-08 | 47.6 ppb |
2016-11-17 | 6110559-07 | 1.36 ppb |
2016-11-17 | 6110559-06 | 45.9 ppb |
2016-11-17 | 6110559-05 | 46.6 ppb |
2016-11-17 | 6110559-04 | 48.4 ppb |
2016-11-17 | 6110559-03 | 48.8 ppb |
2016-11-17 | 6110559-02 | 27.5 ppb |
2016-11-17 | 6110559-01 | 45.4 ppb |
2017-02-22 | 7020603-08 | 0.456 ppb |
2017-02-22 | 7020603-07 | 0.391 ppb |
2017-02-22 | 7020603-06 | 42.4 ppb |
2017-02-22 | 7020603-05 | 0.389 ppb |
2017-02-22 | 7020603-04 | ND |
2017-02-22 | 7020603-03 | 0.463 ppb |
2017-02-22 | 7020603-02 | 0.364 ppb |
2017-02-22 | 7020603-01 | 0.377 ppb |
2017-05-02 | 7050055-01 | 3.30 ppb |
2017-05-25 | 7050898-08 | 0.663 ppb |
2017-05-25 | 7050898-07 | 0.714 ppb |
2017-05-25 | 7050898-06 | 7.47 ppb |
2017-05-25 | 7050898-05 | 0.602 ppb |
2017-05-25 | 7050898-04 | 0.520 ppb |
2017-05-25 | 7050898-03 | 0.940 ppb |
2017-05-25 | 7050898-02 | 0.634 ppb |
2017-05-25 | 7050898-01 | 0.605 ppb |
2017-08-29 | 7081023-08 | 79.4 ppb |
2017-08-29 | 7081023-07 | 1.09 ppb |
2017-08-29 | 7081023-06 | 74.2 ppb |
2017-08-29 | 7081023-05 | 0.863 ppb |
2017-08-29 | 7081023-04 | 0.764 ppb |
2017-08-29 | 7081023-03 | 20.3 ppb |
2017-08-29 | 7081023-02 | 0.812 ppb |
2017-08-29 | 7081023-01 | 1.16 ppb |
2017-10-25 | 7100771-01 | 0.270 ppb |
2017-11-28 | 7110898-01 | 0.262 ppb |
2017-11-30 | 7111015-08 | 0.856 ppb |
2017-11-30 | 7111015-07 | 0.549 ppb |
2017-11-30 | 7111015-06 | 2.57 ppb |
2017-11-30 | 7111015-05 | 0.568 ppb |
2017-11-30 | 7111015-04 | 0.540 ppb |
2017-11-30 | 7111015-03 | 0.588 ppb |
2017-11-30 | 7111015-02 | 0.604 ppb |
2017-11-30 | 7111015-01 | 0.702 ppb |
2018-02-28 | 8020863-08 | 0.598 ppb |
2018-02-28 | 8020863-07 | 0.532 ppb |
2018-02-28 | 8020863-06 | 1.85 ppb |
2018-02-28 | 8020863-05 | 0.543 ppb |
2018-02-28 | 8020863-04 | 0.490 ppb |
2018-02-28 | 8020863-03 | 0.572 ppb |
2018-02-28 | 8020863-02 | 0.545 ppb |
2018-02-28 | 8020863-01 | 0.566 ppb |
2018-05-30 | 8051193-08 | 0.652 ppb |
2018-05-30 | 8051193-07 | 0.590 ppb |
2018-05-30 | 8051193-06 | 1.83 ppb |
2018-05-30 | 8051193-05 | 0.562 ppb |
2018-05-30 | 8051193-04 | 0.439 ppb |
2018-05-30 | 8051193-03 | 0.580 ppb |
2018-05-30 | 8051193-02 | 0.651 ppb |
2018-05-30 | 8051193-01 | 0.576 ppb |
2018-08-22 | 8080907-08 | 1.18 ppb |
2018-08-22 | 8080907-07 | 0.832 ppb |
2018-08-22 | 8080907-06 | 1.52 ppb |
2018-08-22 | 8080907-05 | 0.956 ppb |
2018-08-22 | 8080907-04 | 0.672 ppb |
2018-08-22 | 8080907-03 | 0.801 ppb |
2018-08-22 | 8080907-02 | 0.840 ppb |
2018-08-22 | 8080907-01 | 0.863 ppb |
2018-11-21 | 8110847-08 | 0.708 ppb |
2018-11-21 | 8110847-07 | 0.693 ppb |
2018-11-21 | 8110847-06 | 1.08 ppb |
2018-11-21 | 8110847-05 | 0.974 ppb |
2018-11-21 | 8110847-04 | 0.672 ppb |
2018-11-21 | 8110847-03 | 0.702 ppb |
2018-11-21 | 8110847-02 | 0.737 ppb |
2018-11-21 | 8110847-01 | 0.834 ppb |
2019-03-07 | 9030255-08 | 0.565 ppb |
2019-03-07 | 9030255-07 | 0.556 ppb |
2019-03-07 | 9030255-06 | 1.18 ppb |
2019-03-07 | 9030255-05 | 0.503 ppb |
2019-03-07 | 9030255-04 | 0.450 ppb |
2019-03-07 | 9030255-03 | 0.505 ppb |
2019-03-07 | 9030255-02 | 0.471 ppb |
2019-03-07 | 9030255-01 | 0.515 ppb |
2019-05-15 | 9050674-01 | 0.252 ppb |
2019-05-31 | 9051348-08 | 0.571 ppb |
2019-05-31 | 9051348-07 | 0.815 ppb |
2019-05-31 | 9051348-06 | 1.09 ppb |
2019-05-31 | 9051348-05 | 0.824 ppb |
2019-05-31 | 9051348-04 | 0.619 ppb |
2019-05-31 | 9051348-03 | 0.683 ppb |
2019-05-31 | 9051348-02 | 0.640 ppb |
2019-05-31 | 9051348-01 | 0.767 ppb |
2019-08-30 | 9081507-08 | 0.604 ppb |
2019-08-30 | 9081507-07 | 0.488 ppb |
2019-08-30 | 9081507-06 | 0.772 ppb |
2019-08-30 | 9081507-05 | 0.497 ppb |
2019-08-30 | 9081507-04 | 0.454 ppb |
2019-08-30 | 9081507-03 | 0.544 ppb |
2019-08-30 | 9081507-02 | 0.598 ppb |
2019-08-30 | 9081507-01 | 0.648 ppb |
2019-09-19 | 9090873-01 | 0.258 ppb |
2019-11-27 | 9111208-08 | 0.685 ppb |
2019-11-27 | 9111208-07 | 0.694 ppb |
2019-11-27 | 9111208-06 | 0.695 ppb |
2019-11-27 | 9111208-05 | 0.945 ppb |
2019-11-27 | 9111208-04 | 0.646 ppb |
2019-11-27 | 9111208-03 | 0.641 ppb |
2019-11-27 | 9111208-02 | 0.699 ppb |
2019-11-27 | 9111208-01 | 0.665 ppb |