Know Your Environment. Protect Your Health.

Chloroform

CTWC - Unionville 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.

 

117

Samples

0

Samples exceeding legal limit (MCL)

104

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201830.8 ppb1918ND - 50.7 ppb
201936.2 ppb1817ND - 63.5 ppb
202022.8 ppb2117ND - 70.6 ppb
202130.6 ppb2219ND - 76.6 ppb
202225.7 ppb2017ND - 61.0 ppb
202334.0 ppb1716ND - 53.0 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
2018-01-16BZ73286TTHM33.0 ppb
2018-01-16BZ73287TTHM26.0 ppb
2018-01-16BZ73288TTHM32.0 ppb
2018-01-16BZ73289TTHM36.0 ppb
2018-04-27CA37381TTHM31.0 ppb
2018-04-27CA37382TTHM30.0 ppb
2018-04-27CA37383TTHM34.0 ppb
2018-04-27CA37384TTHM39.0 ppb
2018-07-23CA967420.830 ppb
2018-07-23CA96743ND
2018-07-24CA9673439.0 ppb
2018-07-24CA9673536.0 ppb
2018-07-24CA9673643.0 ppb
2018-07-24CA9673743.0 ppb
2018-07-31CB013603.20 ppb
2018-10-02DBP 20050766539.6 ppb
2018-10-02DBP 20050766629.0 ppb
2018-10-02DBP 20050766750.7 ppb
2018-10-02DBP 20050802039.6 ppb
2019-01-08DBP 20051813058.4 ppb
2019-01-08DBP 20051813620.9 ppb
2019-01-08DBP 20051813946.6 ppb
2019-01-08DBP 20051814352.0 ppb
2019-01-29VOC1 200520002ND
2019-01-29VOC1 2005199970.900 ppb
2019-04-09DBP 20052784629.0 ppb
2019-04-09DBP 20052784710.4 ppb
2019-04-09DBP 20052784848.0 ppb
2019-04-09DBP 20052784916.9 ppb
2019-07-02DBP 20053898641.7 ppb
2019-07-02DBP 20053898750.8 ppb
2019-07-02DBP 20053898839.5 ppb
2019-07-02DBP 20053898946.3 ppb
2019-10-08DBP 20055201238.9 ppb
2019-10-08DBP 20055201363.5 ppb
2019-10-08DBP 20055201441.0 ppb
2019-10-08DBP 20055201547.6 ppb
2020-01-16DBP 20056340028.2 ppb
2020-01-16DBP 20056340159.9 ppb
2020-01-16DBP 20056340246.5 ppb
2020-01-16DBP 20056340326.1 ppb
2020-04-16DBP 20057291729.0 ppb
2020-04-16DBP 20057291838.6 ppb
2020-04-16DBP 20057292070.6 ppb
2020-04-16DBP 20057292229.4 ppb
2020-06-25VOC1 2005807190.600 ppb
2020-07-13DBP 20058248141.3 ppb
2020-07-13DBP 2005824822.70 ppb
2020-07-13DBP 20058248334.0 ppb
2020-07-14DBP 20058284124.8 ppb
2020-08-10VOC1 200585664ND
2020-10-02VOC1 200592466ND
2020-10-02VOC1 200593237ND
2020-10-02VOC1 200592486ND
2020-10-19DBP 2005944694.90 ppb
2020-10-20DBP 20059484726.2 ppb
2020-10-20DBP 2005948486.20 ppb
2020-10-20DBP 2005948499.00 ppb
2021-01-08DBP 20060341021.4 ppb
2021-01-08DBP 20060341121.5 ppb
2021-01-08DBP 20060341226.1 ppb
2021-01-08DBP 2006034137.40 ppb
2021-03-02VOC1 200608358ND
2021-03-02VOC1 2006083570.700 ppb
2021-04-15DBP 20061365829.6 ppb
2021-04-15DBP 20061365920.8 ppb
2021-04-15DBP 20061366037.4 ppb
2021-04-15DBP 20061366128.7 ppb
2021-06-04VOC1 200619708ND
2021-07-15DBP 20062513556.2 ppb
2021-07-15DBP 20062513664.4 ppb
2021-07-15DBP 20062513776.6 ppb
2021-07-15DBP 20062513847.7 ppb
2021-07-20VOC1 200625423ND
2021-07-29DBP 20062667833.6 ppb
2021-10-11H300079420 30007942444.7 ppb
2021-10-11H300079421 30007942641.9 ppb
2021-10-11H300079422 30007942858.7 ppb
2021-10-11H300079423 30007943054.7 ppb
2021-10-15V300084253 3000842541.20 ppb
2022-01-13CK1552261.0 ppb
2022-01-13CK1552316.0 ppb
2022-01-13CK1552457.0 ppb
2022-01-13CK1552539.0 ppb
2022-01-21CK22680ND
2022-01-21CK226810.510 ppb
2022-03-25CK96363ND
2022-04-05CL00751ND
2022-04-08CL0614836.0 ppb
2022-04-08CL061491.60 ppb
2022-04-08CL061501.10 ppb
2022-04-08CL0615113.0 ppb
2022-07-11CL7532745.0 ppb
2022-07-11CL753289.70 ppb
2022-07-11CL7532943.0 ppb
2022-07-11CL7533052.0 ppb
2022-10-07CM5882031.0 ppb
2022-10-07CM5882147.0 ppb
2022-10-07CM5882227.0 ppb
2022-10-07CM5882335.0 ppb
2023-01-16CN2447937.0 ppb
2023-01-16CN2448018.0 ppb
2023-01-16CN2448134.0 ppb
2023-01-16CN2448212.0 ppb
2023-04-07CN8079039.0 ppb
2023-04-07CN8079114.0 ppb
2023-04-07CN8079241.0 ppb
2023-04-07CN8079321.0 ppb
2023-07-18CO5303442.0 ppb
2023-07-18CO5303552.0 ppb
2023-07-18CO5303635.0 ppb
2023-07-18CO5303743.0 ppb
2023-08-01CO63104ND
2023-10-04CP1781145.0 ppb
2023-10-04CP1781253.0 ppb
2023-10-04CP1781348.0 ppb
2023-10-04CP1781444.0 ppb