Know Your Environment. Protect Your Health.

Chloroform

Southwood Water System

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.

 

66

Samples

0

Samples exceeding legal limit (MCL)

32

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.535 ppb127ND - 2.20 ppb
20190.439 ppb158ND - 1.27 ppb
2020N/A00N/A
20210.683 ppb116ND - 2.30 ppb
20220.421 ppb175ND - 2.20 ppb
20231.27 ppb118ND - 3.30 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
2018-02-141.10 ppb
2018-02-140.300 ppb
2018-03-14ND
2018-03-14ND
2018-05-04ND
2018-05-151.22 ppb
2018-05-15ND
2018-07-19ND
2018-08-212.20 ppb
2018-08-210.660 ppb
2018-11-150.350 ppb
2018-11-150.590 ppb
2019-02-081.15 ppb
2019-02-08ND
2019-05-21ND
2019-05-210.570 ppb
2019-06-260.500 ppb
2019-07-12ND
2019-07-12ND
2019-09-050.640 ppb
2019-09-050.970 ppb
2019-09-05ND
2019-10-15ND
2019-11-130.980 ppb
2019-11-131.27 ppb
2019-12-05ND
2019-12-050.500 ppb
2021-02-174081091ND
2021-02-1740857210.720 ppb
2021-03-124164633ND
2021-03-124166774ND
2021-03-174205286ND
2021-05-2441294352.30 ppb
2021-05-244129436ND
2021-08-1141664720.500 ppb
2021-08-1141664732.10 ppb
2021-11-1042085251.20 ppb
2021-11-1042085260.690 ppb
2022-01-264240240ND
2022-01-264240241ND
2022-01-264240242ND
2022-01-274240239ND
2022-02-044240245ND
2022-02-044258007ND
2022-02-0442580091.50 ppb
2022-02-044240244ND
2022-08-1143593931.40 ppb
2022-08-1543594132.20 ppb
2022-10-1144650870.560 ppb
2022-10-174370660ND
2022-10-314465043ND
2022-10-314464989ND
2022-11-084374813ND
2022-11-0843748121.50 ppb
2022-11-144382866ND
2023-02-144416403ND
2023-02-1444164021.40 ppb
2023-03-144437411ND
2023-03-144437441ND
2023-07-1744882182.00 ppb
2023-07-1744882153.30 ppb
2023-08-0745056013.00 ppb
2023-08-1445055621.30 ppb
2023-09-2645329100.570 ppb
2023-11-1345690511.10 ppb
2023-11-2745690401.30 ppb