Know Your Environment. Protect Your Health.

Chloroform

South Grayson Special Utility District

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.

 

40

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.253 ppb71ND - 1.77 ppb
20190.408 ppb62ND - 1.37 ppb
20200.287 ppb61ND - 1.72 ppb
20210.248 ppb61ND - 1.49 ppb
20220.182 ppb91ND - 1.64 ppb
20230.240 ppb61ND - 1.44 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was based on the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer and harm to fetal growth and development.

ppb = parts per billion

All test results

Date Lab ID Result
2018-02-06Q1804974001ND
2018-05-04Q1818259004ND
2018-05-04Q1818259009ND
2018-10-15Q18408620071.77 ppb
2018-10-15Q1840862009ND
2018-10-15Q1840862011ND
2018-10-15Q1840862013ND
2019-08-13Q19542360161.08 ppb
2019-08-13Q1954236018ND
2019-08-13Q19542360141.37 ppb
2019-08-13Q1954236012ND
2019-08-13Q1954236010ND
2019-08-13Q1954236008ND
2020-08-06Q20311940091.72 ppb
2020-08-06Q2031194011ND
2020-08-06Q2031194013ND
2020-08-06Q2031194015ND
2020-08-06Q2031194017ND
2020-08-06Q2031194042ND
2021-06-16Q2115771008ND
2021-11-10Q2131631010ND
2021-11-10Q21316310181.49 ppb
2021-11-10Q2131631016ND
2021-11-10Q2131631012ND
2021-11-10Q2131631014ND
2022-02-08Q2204251002ND
2022-04-26Q2212466007ND
2022-04-26Q22124660091.64 ppb
2022-04-26Q2212466011ND
2022-04-26Q2212466013ND
2022-04-26Q2212466015ND
2022-06-15Q2216690002ND
2022-08-17Q2224360001ND
2022-10-19Q2231831001ND
2023-05-16Q2318439007ND
2023-05-16Q2318439009ND
2023-05-16Q2318439011ND
2023-05-16Q23184390131.44 ppb
2023-05-16Q2318439015ND
2023-05-16Q2318439039ND