Chloroform
City of Greensboro
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 |
---|---|---|---|---|
2014 | 37.8 ppb | 60 | 60 | 17.0 ppb - 58.0 ppb |
2015 | 39.0 ppb | 48 | 48 | 17.0 ppb - 69.0 ppb |
2016 | 38.3 ppb | 48 | 48 | 8.00 ppb - 59.0 ppb |
2017 | 42.6 ppb | 60 | 60 | 10.00 ppb - 74.0 ppb |
2018 | 34.8 ppb | 48 | 48 | 9.00 ppb - 66.0 ppb |
2019 | 35.0 ppb | 48 | 48 | 11.0 ppb - 60.0 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 |
---|---|---|
2014-02-19 | 16055-14 | 37.0 ppb |
2014-02-19 | 16064-14 | 40.0 ppb |
2014-02-19 | 16056-14 | 42.0 ppb |
2014-02-19 | 16057-14 | 52.0 ppb |
2014-02-19 | 16058-14 | 46.0 ppb |
2014-02-19 | 16059-14 | 47.0 ppb |
2014-02-19 | 16060-14 | 30.0 ppb |
2014-02-19 | 16061-14 | 41.0 ppb |
2014-02-19 | 16062-14 | 25.0 ppb |
2014-02-19 | 16065-14 | 33.0 ppb |
2014-02-19 | 16066-14 | 29.0 ppb |
2014-02-19 | 16067-14 | 26.0 ppb |
2014-05-28 | 173162-14 | 38.0 ppb |
2014-05-28 | 173163-14 | 49.0 ppb |
2014-05-28 | 173164-14 | 58.0 ppb |
2014-05-28 | 173165-14 | 50.0 ppb |
2014-05-28 | 173166-14 | 49.0 ppb |
2014-05-28 | 173167-14 | 47.0 ppb |
2014-05-28 | 173156-14 | 47.0 ppb |
2014-05-28 | 173157-14 | 46.0 ppb |
2014-05-28 | 173158-14 | 42.0 ppb |
2014-05-28 | 173159-14 | 42.0 ppb |
2014-05-28 | 173160-14 | 39.0 ppb |
2014-05-28 | 173161-14 | 48.0 ppb |
2014-08-13 | 37729_14-24243 | 53.0 ppb |
2014-08-13 | 37729_14-24244 | 36.0 ppb |
2014-08-13 | 37729_14-24245 | 53.0 ppb |
2014-08-13 | 37729_14-24246 | 51.0 ppb |
2014-08-13 | 37729_14-24247 | 45.0 ppb |
2014-08-13 | 37729_14-24248 | 53.0 ppb |
2014-08-13 | 37729_14-24249 | 44.0 ppb |
2014-08-13 | 37729_14-24238 | 51.0 ppb |
2014-08-13 | 37729_14-24239 | 49.0 ppb |
2014-08-13 | 37729_14-24240 | 43.0 ppb |
2014-08-13 | 37729_14-24241 | 40.0 ppb |
2014-08-13 | 37729_14-24242 | 40.0 ppb |
2014-08-13 | 173611-14 | 26.0 ppb |
2014-08-13 | 173612-14 | 35.0 ppb |
2014-08-13 | 173613-14 | 26.0 ppb |
2014-08-13 | 173614-14 | 35.0 ppb |
2014-08-13 | 173615-14 | 32.0 ppb |
2014-08-13 | 173616-14 | 38.0 ppb |
2014-08-13 | 173617-14 | 34.0 ppb |
2014-08-13 | 173618-14 | 35.0 ppb |
2014-08-13 | 173607-14 | 35.0 ppb |
2014-08-13 | 173608-14 | 35.0 ppb |
2014-08-13 | 173609-14 | 31.0 ppb |
2014-08-13 | 173610-14 | 27.0 ppb |
2014-11-18 | 37729_14-35106 | 35.0 ppb |
2014-11-18 | 37729_14-35107 | 32.0 ppb |
2014-11-18 | 37729_14-35108 | 34.0 ppb |
2014-11-18 | 37729_14-35112 | 30.0 ppb |
2014-11-18 | 37729_14-35113 | 25.0 ppb |
2014-11-18 | 37729_14-35114 | 33.0 ppb |
2014-11-18 | 37729_14-35115 | 21.0 ppb |
2014-11-18 | 37729_14-35116 | 18.0 ppb |
2014-11-18 | 37729_14-35117 | 19.0 ppb |
2014-11-18 | 37729_14-35118 | 27.0 ppb |
2014-11-18 | 37729_14-35119 | 17.0 ppb |
2014-11-18 | 37729_14-35120 | 27.0 ppb |
2015-02-18 | 22.0 ppb | |
2015-02-18 | 21.0 ppb | |
2015-02-18 | 22.0 ppb | |
2015-02-18 | 29.0 ppb | |
2015-02-18 | 22.0 ppb | |
2015-02-18 | 23.0 ppb | |
2015-02-18 | 17.0 ppb | |
2015-02-18 | 20.0 ppb | |
2015-02-18 | 26.0 ppb | |
2015-02-18 | 18.0 ppb | |
2015-02-18 | 24.0 ppb | |
2015-02-18 | 27.0 ppb | |
2015-05-13 | 69.0 ppb | |
2015-05-13 | 53.0 ppb | |
2015-05-13 | 46.0 ppb | |
2015-05-13 | 43.0 ppb | |
2015-05-13 | 44.0 ppb | |
2015-05-13 | 43.0 ppb | |
2015-05-13 | 36.0 ppb | |
2015-05-13 | 50.0 ppb | |
2015-05-13 | 43.0 ppb | |
2015-05-13 | 35.0 ppb | |
2015-05-13 | 33.0 ppb | |
2015-05-13 | 33.0 ppb | |
2015-08-13 | 41.0 ppb | |
2015-08-13 | 38.0 ppb | |
2015-08-13 | 39.0 ppb | |
2015-08-13 | 57.0 ppb | |
2015-08-13 | 50.0 ppb | |
2015-08-13 | 57.0 ppb | |
2015-08-13 | 60.0 ppb | |
2015-08-13 | 38.0 ppb | |
2015-08-13 | 59.0 ppb | |
2015-08-13 | 45.0 ppb | |
2015-08-13 | 56.0 ppb | |
2015-08-13 | 54.0 ppb | |
2015-11-12 | 53.0 ppb | |
2015-11-12 | 47.0 ppb | |
2015-11-12 | 45.0 ppb | |
2015-11-12 | 37.0 ppb | |
2015-11-12 | 36.0 ppb | |
2015-11-12 | 36.0 ppb | |
2015-11-12 | 41.0 ppb | |
2015-11-12 | 40.0 ppb | |
2015-11-12 | 36.0 ppb | |
2015-11-12 | 38.0 ppb | |
2015-11-12 | 35.0 ppb | |
2015-11-12 | 37.0 ppb | |
2016-02-10 | 181-16 | 31.0 ppb |
2016-02-10 | 183-16 | 25.0 ppb |
2016-02-10 | 182-16 | 33.0 ppb |
2016-02-10 | 180-16 | 40.0 ppb |
2016-02-10 | 184-16 | 24.0 ppb |
2016-02-10 | 188-16 | 10.00 ppb |
2016-02-10 | 189-16 | 24.0 ppb |
2016-02-10 | 185-16 | 23.0 ppb |
2016-02-10 | 190-16 | 10.00 ppb |
2016-02-10 | 191-16 | 24.0 ppb |
2016-02-10 | 186-16 | 8.00 ppb |
2016-02-10 | 187-16 | 8.00 ppb |
2016-05-11 | 588-16 | 46.0 ppb |
2016-05-11 | 593-16 | 46.0 ppb |
2016-05-11 | 584-16 | 30.0 ppb |
2016-05-11 | 586-16 | 29.0 ppb |
2016-05-11 | 591-16 | 47.0 ppb |
2016-05-11 | 590-16 | 50.0 ppb |
2016-05-11 | 594-16 | 48.0 ppb |
2016-05-11 | 595-16 | 46.0 ppb |
2016-05-11 | 585-16 | 31.0 ppb |
2016-05-11 | 587-16 | 43.0 ppb |
2016-05-11 | 592-16 | 46.0 ppb |
2016-05-12 | 589-16 | 48.0 ppb |
2016-08-30 | 1217-16 | 36.0 ppb |
2016-08-30 | 1220-16 | 52.0 ppb |
2016-08-30 | 1225-16 | 57.0 ppb |
2016-08-30 | 1226-16 | 59.0 ppb |
2016-08-30 | 1215-16 | 55.0 ppb |
2016-08-30 | 1218-16 | 45.0 ppb |
2016-08-30 | 1224-16 | 52.0 ppb |
2016-08-30 | 1216-16 | 55.0 ppb |
2016-08-30 | 1221-16 | 42.0 ppb |
2016-08-30 | 1223-16 | 44.0 ppb |
2016-08-30 | 1219-16 | 45.0 ppb |
2016-08-30 | 1222-16 | 54.0 ppb |
2016-11-16 | 1747-16 | 42.0 ppb |
2016-11-16 | 1746-16 | 38.0 ppb |
2016-11-16 | 1744-16 | 25.0 ppb |
2016-11-16 | 1745-16 | 47.0 ppb |
2016-11-16 | 1750-16 | 38.0 ppb |
2016-11-16 | 1753-16 | 35.0 ppb |
2016-11-16 | 1755-16 | 43.0 ppb |
2016-11-16 | 1752-16 | 35.0 ppb |
2016-11-16 | 1756-16 | 51.0 ppb |
2016-11-16 | 1751-16 | 36.0 ppb |
2016-11-16 | 1757-16 | 42.0 ppb |
2016-11-16 | 1758-16 | 39.0 ppb |
2017-02-15 | 270A-17 | 29.0 ppb |
2017-02-15 | 266A-17 | 31.0 ppb |
2017-02-15 | 274A-17 | 37.0 ppb |
2017-02-15 | 267A-17 | 36.0 ppb |
2017-02-15 | 276A-17 | 25.0 ppb |
2017-02-15 | 271A-17 | 33.0 ppb |
2017-02-15 | 273A-17 | 38.0 ppb |
2017-02-15 | 275A-17 | 37.0 ppb |
2017-02-15 | 265A-17 | 32.0 ppb |
2017-02-15 | 269A-17 | 34.0 ppb |
2017-02-15 | 268A-17 | 34.0 ppb |
2017-02-15 | 272A-17 | 31.0 ppb |
2017-02-15 | 274-17 | 37.0 ppb |
2017-02-15 | 266-17 | 31.0 ppb |
2017-02-15 | 270-17 | 29.0 ppb |
2017-02-15 | 275-17 | 37.0 ppb |
2017-02-15 | 276-17 | 25.0 ppb |
2017-02-15 | 265-17 | 32.0 ppb |
2017-02-15 | 267-17 | 36.0 ppb |
2017-02-15 | 269-17 | 34.0 ppb |
2017-02-15 | 273-17 | 38.0 ppb |
2017-02-15 | 268-17 | 34.0 ppb |
2017-02-15 | 271-17 | 33.0 ppb |
2017-02-15 | 272-17 | 31.0 ppb |
2017-05-16 | 762-17 | 51.0 ppb |
2017-05-16 | 756-17 | 56.0 ppb |
2017-05-16 | 757-17 | 56.0 ppb |
2017-05-16 | 760-17 | 53.0 ppb |
2017-05-16 | 764-17 | 43.0 ppb |
2017-05-16 | 763-17 | 48.0 ppb |
2017-05-16 | 765-17 | 44.0 ppb |
2017-05-16 | 755-17 | 59.0 ppb |
2017-05-16 | 758-17 | 53.0 ppb |
2017-05-16 | 759-17 | 49.0 ppb |
2017-05-16 | 761-17 | 52.0 ppb |
2017-05-16 | 766-17 | 43.0 ppb |
2017-08-16 | 1290-17 | 68.0 ppb |
2017-08-16 | 1295-17 | 70.0 ppb |
2017-08-16 | 1299-17 | 68.0 ppb |
2017-08-16 | 1291-17 | 66.0 ppb |
2017-08-16 | 1298-17 | 71.0 ppb |
2017-08-16 | 1300-17 | 67.0 ppb |
2017-08-16 | 1292-17 | 66.0 ppb |
2017-08-16 | 1294-17 | 70.0 ppb |
2017-08-16 | 1296-17 | 63.0 ppb |
2017-08-16 | 1289-17 | 72.0 ppb |
2017-08-16 | 1293-17 | 63.0 ppb |
2017-08-16 | 1297-17 | 74.0 ppb |
2017-11-14 | 1972-17 | 32.0 ppb |
2017-11-14 | 1965-17 | 33.0 ppb |
2017-11-14 | 1969-17 | 12.0 ppb |
2017-11-14 | 1974-17 | 31.0 ppb |
2017-11-14 | 1975-17 | 38.0 ppb |
2017-11-14 | 1976-17 | 31.0 ppb |
2017-11-14 | 1967-17 | 48.0 ppb |
2017-11-14 | 1971-17 | 10.00 ppb |
2017-11-14 | 1966-17 | 37.0 ppb |
2017-11-14 | 1968-17 | 13.0 ppb |
2017-11-14 | 1973-17 | 13.0 ppb |
2017-11-14 | 1970-17 | 39.0 ppb |
2018-02-13 | 290-18 | 26.0 ppb |
2018-02-13 | 291-18 | 26.0 ppb |
2018-02-13 | 292-18 | 26.0 ppb |
2018-02-13 | 293-18 | 25.0 ppb |
2018-02-13 | 294-18 | 30.0 ppb |
2018-02-13 | 295-18 | 28.0 ppb |
2018-02-13 | 296-18 | 25.0 ppb |
2018-02-13 | 297-1 | 23.0 ppb |
2018-02-13 | 298-18 | 61.0 ppb |
2018-02-13 | 299-18 | 49.0 ppb |
2018-02-13 | 301-18 | 25.0 ppb |
2018-02-13 | 305-18 | 44.0 ppb |
2018-05-30 | 906-18 | 38.0 ppb |
2018-05-30 | 907-18 | 39.0 ppb |
2018-05-30 | 908-18 | 28.0 ppb |
2018-05-30 | 909-18 | 18.0 ppb |
2018-05-30 | 910-18 | 16.0 ppb |
2018-05-30 | 911-18 | 33.0 ppb |
2018-05-30 | 912-18 | 9.00 ppb |
2018-05-30 | 913-18 | 46.0 ppb |
2018-05-30 | 914-18 | 11.0 ppb |
2018-05-30 | 915-18 | 45.0 ppb |
2018-05-30 | 916-18 | 41.0 ppb |
2018-05-30 | 917-18 | 48.0 ppb |
2018-08-21 | 1546-18 | 62.0 ppb |
2018-08-21 | 1547-18 | 66.0 ppb |
2018-08-21 | 1548-18 | 47.0 ppb |
2018-08-21 | 1549-18 | 22.0 ppb |
2018-08-21 | 1550-18 | 20.0 ppb |
2018-08-21 | 1551-18 | 58.0 ppb |
2018-08-21 | 1552-18 | 16.0 ppb |
2018-08-21 | 1553-18 | 62.0 ppb |
2018-08-21 | 1554-18 | 13.0 ppb |
2018-08-21 | 1555-18 | 62.0 ppb |
2018-08-21 | 1556-18 | 46.0 ppb |
2018-08-21 | 1557-18 | 58.0 ppb |
2018-11-14 | 2272-18 | 41.0 ppb |
2018-11-14 | 2273-18 | 42.0 ppb |
2018-11-14 | 2274-18 | 35.0 ppb |
2018-11-14 | 2275-18 | 19.0 ppb |
2018-11-14 | 2276-18 | 19.0 ppb |
2018-11-14 | 2277-18 | 39.0 ppb |
2018-11-14 | 2278-18 | 16.0 ppb |
2018-11-14 | 2279-18 | 40.0 ppb |
2018-11-14 | 2280-18 | 15.0 ppb |
2018-11-14 | 2281-18 | 39.0 ppb |
2018-11-14 | 2282-18 | 34.0 ppb |
2018-11-14 | 2283-18 | 40.0 ppb |
2019-02-13 | 3042-19 | 26.0 ppb |
2019-02-13 | 3043-19 | 30.0 ppb |
2019-02-13 | 3044-19 | 44.0 ppb |
2019-02-13 | 3045-19 | 21.0 ppb |
2019-02-13 | 3046-19 | 20.0 ppb |
2019-02-13 | 3047-19 | 44.0 ppb |
2019-02-13 | 3048-19 | 17.0 ppb |
2019-02-13 | 3049-19 | 19.0 ppb |
2019-02-13 | 3050-19 | 17.0 ppb |
2019-02-13 | 3051-19 | 32.0 ppb |
2019-02-13 | 3052-19 | 39.0 ppb |
2019-02-13 | 3053-19 | 34.0 ppb |
2019-05-15 | 3739-19 | 44.0 ppb |
2019-05-15 | 3740-19 | 47.0 ppb |
2019-05-15 | 3741-19 | 45.0 ppb |
2019-05-15 | 3742-19 | 46.0 ppb |
2019-05-15 | 3743-19 | 45.0 ppb |
2019-05-15 | 3744-19 | 41.0 ppb |
2019-05-15 | 3745-19 | 45.0 ppb |
2019-05-15 | 3746-19 | 25.0 ppb |
2019-05-15 | 3747-19 | 24.0 ppb |
2019-05-15 | 3748-19 | 53.0 ppb |
2019-05-15 | 3749-19 | 21.0 ppb |
2019-05-15 | 3750-19 | 21.0 ppb |
2019-08-14 | 4670-19 | 53.0 ppb |
2019-08-14 | 4671-19 | 51.0 ppb |
2019-08-14 | 4672-19 | 53.0 ppb |
2019-08-14 | 4673-19 | 59.0 ppb |
2019-08-14 | 4674-19 | 60.0 ppb |
2019-08-14 | 4675-19 | 13.0 ppb |
2019-08-14 | 4676-19 | 16.0 ppb |
2019-08-14 | 4677-19 | 34.0 ppb |
2019-08-14 | 4678-19 | 15.0 ppb |
2019-08-14 | 4679-19 | 11.0 ppb |
2019-08-14 | 4680-19 | 24.0 ppb |
2019-08-14 | 4681-19 | 28.0 ppb |
2019-11-13 | 5490-19 | 49.0 ppb |
2019-11-13 | 5491-19 | 50.0 ppb |
2019-11-13 | 5492-19 | 23.0 ppb |
2019-11-13 | 5493-19 | 35.0 ppb |
2019-11-13 | 5494-19 | 29.0 ppb |
2019-11-13 | 5495-19 | 33.0 ppb |
2019-11-13 | 5496-19 | 29.0 ppb |
2019-11-13 | 5497-19 | 51.0 ppb |
2019-11-13 | 5498-19 | 27.0 ppb |
2019-11-13 | 5499-19 | 52.0 ppb |
2019-11-13 | 5500-19 | 25.0 ppb |
2019-11-13 | 5501-19 | 59.0 ppb |