Know Your Environment. Protect Your Health.

Chloroform

City of Sansom Park

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.

 

88

Samples

0

Samples exceeding legal limit (MCL)

37

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.33 ppb147ND - 4.05 ppb
20191.51 ppb149ND - 3.77 ppb
20200.609 ppb144ND - 2.98 ppb
20210.576 ppb164ND - 3.47 ppb
20221.40 ppb166ND - 8.36 ppb
20231.66 ppb147ND - 6.68 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
2018-02-07Q1805498002ND
2018-02-07Q18054980012.60 ppb
2018-03-28Q1812846002ND
2018-03-28Q1812846004ND
2018-03-28Q18128460052.85 ppb
2018-03-28Q18128460071.60 ppb
2018-03-28Q18128460091.55 ppb
2018-05-22Q18207290013.68 ppb
2018-05-22Q1820729002ND
2018-09-12Q1836539002ND
2018-09-12Q1836539001ND
2018-10-25Q18427220022.29 ppb
2018-11-08Q18447800014.05 ppb
2018-11-08Q1844780002ND
2019-02-06Q19054960013.77 ppb
2019-02-06Q19054960022.80 ppb
2019-05-02Q19181460261.77 ppb
2019-05-02Q19181460241.15 ppb
2019-05-02Q19181460222.46 ppb
2019-05-02Q1918146020ND
2019-05-02Q19181460171.17 ppb
2019-05-02Q19181460163.40 ppb
2019-05-02Q1918146002ND
2019-05-02Q1918146018ND
2019-09-13Q19652770011.96 ppb
2019-09-13Q1965277002ND
2019-11-18Q19771250012.65 ppb
2019-11-18Q1977125002ND
2020-01-21Q2002279035ND
2020-01-21Q2002279034ND
2020-01-21Q2002279015ND
2020-01-21Q20022790131.18 ppb
2020-01-21Q2002279011ND
2020-01-21Q2002279009ND
2020-05-21Q2020444001ND
2020-05-21Q2020444002ND
2020-09-01Q20348330052.21 ppb
2020-09-01Q2034833007ND
2020-09-01Q20348330172.15 ppb
2020-09-01Q2034833018ND
2020-10-28Q20416170012.98 ppb
2020-10-28Q2041617002ND
2021-03-09Q2106121020ND
2021-03-09Q2106121019ND
2021-03-09Q2106121011ND
2021-03-09Q2106121017ND
2021-03-09Q2106121013ND
2021-03-09Q2106121009ND
2021-03-09Q21061210073.47 ppb
2021-03-09Q21061210151.13 ppb
2021-04-28Q2110742001ND
2021-04-28Q2110742002ND
2021-08-03Q21201840011.56 ppb
2021-08-03Q2120184002ND
2021-09-14Q2124999006ND
2021-11-15Q21317820063.06 ppb
2021-11-15Q2131782007ND
2021-12-14Q2135515001ND
2022-03-14Q2208529005ND
2022-03-14Q2208529010ND
2022-03-14Q22085290091.51 ppb
2022-05-05Q2213616004ND
2022-05-05Q22136160081.98 ppb
2022-05-05Q2213616009ND
2022-08-01Q22218910011.26 ppb
2022-08-01Q2221891002ND
2022-10-13Q2231074027ND
2022-10-13Q2231074003ND
2022-10-13Q22310740163.05 ppb
2022-10-13Q2231074011ND
2022-10-13Q22310740078.36 ppb
2022-10-13Q22310740056.18 ppb
2022-10-13Q2231074001ND
2022-10-13Q2231074009ND
2023-01-18Q23025990012.98 ppb
2023-01-18Q2302599002ND
2023-04-13Q2313713005ND
2023-04-13Q23137130093.92 ppb
2023-04-13Q2313713010ND
2023-08-15Q2334087010ND
2023-08-15Q2334087038ND
2023-08-15Q23340870375.40 ppb
2023-08-15Q23340870181.07 ppb
2023-08-15Q23340870161.52 ppb
2023-08-15Q23340870146.68 ppb
2023-08-15Q2334087012ND
2023-12-01Q2351637001ND
2023-12-01Q23516370021.69 ppb