Know Your Environment. Protect Your Health.

Chloroform

Georgetown Water Department

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.

 

61

Samples

0

Samples exceeding legal limit (MCL)

12

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.169 ppb72ND - 0.650 ppb
20190.201 ppb82ND - 0.980 ppb
20200.751 ppb73ND - 3.02 ppb
20210.883 ppb32ND - 1.87 ppb
20220.0464 ppb141ND - 0.650 ppb
20230.785 ppb222ND - 8.76 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
2018-03-14S769306ND
2018-06-18S813747ND
2018-06-25S7925190.650 ppb
2018-07-02S8082920.530 ppb
2018-08-30S824396ND
2018-12-189948087-EVOCND
2018-12-28S816944ND
2019-01-28S860823ND
2019-02-08L7103316-EVOCND
2019-04-17S872273ND
2019-08-22S8485070.980 ppb
2019-08-22S8485090.630 ppb
2019-09-26S909231ND
2019-11-15S925389ND
2019-11-15S925386ND
2020-02-18S932571ND
2020-05-04S952565ND
2020-06-22S9695441.52 ppb
2020-06-22S9695463.02 ppb
2020-09-18S969760ND
2020-10-05S977627ND
2020-10-05S9776210.720 ppb
2021-03-17S1048421ND
2021-08-10S10090670.780 ppb
2021-11-12S11484571.87 ppb
2022-02-16S1159447ND
2022-04-07S1185506ND
2022-04-07S1185434ND
2022-06-30S1209331ND
2022-06-30S1209329ND
2022-06-30S1209322ND
2022-06-30S1209324ND
2022-06-30S1209327ND
2022-09-16S12308150.650 ppb
2022-10-06S1230981ND
2022-10-06S1230979ND
2022-10-06S1230983ND
2022-10-10S1231009ND
2022-10-10S1231007ND
2023-03-24S1282875ND
2023-03-24S1282873ND
2023-03-24S1282871ND
2023-03-24S1282869ND
2023-03-24S1282867ND
2023-06-26S1287829ND
2023-06-26S1287827ND
2023-06-26S1287825ND
2023-06-30S1260840ND
2023-06-30S1260837ND
2023-09-13S12876838.52 ppb
2023-09-13S12876958.76 ppb
2023-09-28S1307835ND
2023-09-28S1307841ND
2023-09-28S1307839ND
2023-09-28S1307837ND
2023-09-28S1307833ND
2023-11-21S1307974ND
2023-11-21S1307971ND
2023-11-21S1307969ND
2023-11-21S1307968ND
2023-11-21S1307966ND