Know Your Environment. Protect Your Health.

Chloroform

CTWC - Shoreline Region-Guilford 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.

 

164

Samples

0

Samples exceeding legal limit (MCL)

133

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201814.5 ppb2723ND - 44.7 ppb
201910.4 ppb2621ND - 22.6 ppb
202013.8 ppb2822ND - 30.5 ppb
202118.7 ppb2722ND - 63.8 ppb
202212.9 ppb3022ND - 34.0 ppb
202319.9 ppb2623ND - 51.0 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
2018-01-16BZ73485VOC16.80 ppb
2018-03-15CA03073TTHM17.0 ppb
2018-03-15CA03074TTHM13.0 ppb
2018-03-15CA03075TTHM19.0 ppb
2018-03-15CA03076TTHM20.0 ppb
2018-03-30CA11464VOC19.40 ppb
2018-04-11CA18261VOC17.00 ppb
2018-06-26CA80045TTHM31.0 ppb
2018-06-26CA80046TTHM28.0 ppb
2018-06-26CA80047TTHM23.0 ppb
2018-06-26CA80048TTHM19.0 ppb
2018-07-09CA85598VOC1ND
2018-07-17CA919798.40 ppb
2018-09-12DBP 20050504224.8 ppb
2018-09-12DBP 20050504344.7 ppb
2018-09-12DBP 20050504438.2 ppb
2018-09-12DBP 20050504743.7 ppb
2018-09-13VOC1 200505275ND
2018-09-13VOC1 200505276ND
2018-09-13VOC1 200505266ND
2018-09-19VOC1 2005061161.000 ppb
2018-09-20VOC1 2005063240.600 ppb
2018-10-25VOC1 20051056812.3 ppb
2018-12-17DBP 2005162355.50 ppb
2018-12-17DBP 2005162373.70 ppb
2018-12-17DBP 2005162387.40 ppb
2018-12-17DBP 2005162398.70 ppb
2019-01-30VOC1 2005200574.00 ppb
2019-03-11DBP 2005241504.90 ppb
2019-03-11DBP 2005241517.40 ppb
2019-03-11DBP 20052415210.6 ppb
2019-03-11DBP 20052415411.2 ppb
2019-06-14DBP 2005366729.70 ppb
2019-06-14DBP 20053667413.3 ppb
2019-06-14DBP 20053668016.6 ppb
2019-06-14DBP 20053668216.4 ppb
2019-06-24VOC1 2005380057.40 ppb
2019-07-08VOC1 2005411727.30 ppb
2019-07-08VOC1 200539194ND
2019-07-16VOC1 200541091ND
2019-07-16VOC1 2005406480.800 ppb
2019-07-16VOC1 200540644ND
2019-09-17DBP 20054947817.3 ppb
2019-09-17DBP 20054947919.6 ppb
2019-09-17DBP 20054948020.9 ppb
2019-09-17DBP 20054948121.6 ppb
2019-09-17VOC1 200549238ND
2019-09-18VOC1 200549465ND
2019-12-10DBP 2005596429.70 ppb
2019-12-10DBP 20055964316.1 ppb
2019-12-10DBP 20055964419.6 ppb
2019-12-10DBP 20055964522.6 ppb
2019-12-10VOC1 20055966313.2 ppb
2020-01-14VOC1 20056285615.9 ppb
2020-01-20VOC1 200563521ND
2020-01-21VOC1 200563515ND
2020-01-30VOC1 2005646030.800 ppb
2020-02-11VOC1 20056579910.1 ppb
2020-02-25VOC1 200567276ND
2020-03-03DBP 20056799811.0 ppb
2020-03-05DBP 2005685748.10 ppb
2020-03-05DBP 20056857514.3 ppb
2020-03-05DBP 20056857614.9 ppb
2020-04-01VOC1 2005710178.10 ppb
2020-06-16DBP 20057954318.0 ppb
2020-06-16DBP 20057954525.2 ppb
2020-06-16DBP 20057954629.2 ppb
2020-06-16DBP 20057954726.0 ppb
2020-06-16VOC1 200579533ND
2020-07-14VOC1 20058270811.3 ppb
2020-07-14VOC1 200582710ND
2020-09-17DBP 20059105114.1 ppb
2020-09-17DBP 20059105222.8 ppb
2020-09-17DBP 20059105327.7 ppb
2020-09-17DBP 20059105430.5 ppb
2020-10-06VOC1 20059286616.5 ppb
2020-10-13VOC1 200593765ND
2020-12-22DBP 20060203013.4 ppb
2020-12-22DBP 20060203123.9 ppb
2020-12-22DBP 20060203222.6 ppb
2020-12-22DBP 20060203322.1 ppb
2021-01-05VOC1 200602753ND
2021-01-06VOC1 2006029969.40 ppb
2021-01-25VOC1 2006047681.20 ppb
2021-03-15DBP 20060984211.5 ppb
2021-03-15DBP 20060984315.9 ppb
2021-03-15DBP 20060984417.8 ppb
2021-03-15DBP 20060984518.5 ppb
2021-06-02DBP 20061926323.8 ppb
2021-06-02DBP 20061926431.2 ppb
2021-06-02DBP 20061926533.2 ppb
2021-06-02DBP 20061926634.8 ppb
2021-06-07VOC1 200621229ND
2021-06-23VOC1 20062200416.3 ppb
2021-06-29VOC1 200622710ND
2021-07-12VOC1 20062425216.0 ppb
2021-07-12VOC1 200624251ND
2021-07-20VOC1 200625447ND
2021-09-14300059734 30005973939.9 ppb
2021-09-14300059735 30005974138.8 ppb
2021-09-14300059736 30005974360.7 ppb
2021-09-14300059737 30005974563.8 ppb
2021-10-11V300077965 30007796610.2 ppb
2021-12-06V300113153 3001131559.90 ppb
2021-12-09D300117672 3001176778.40 ppb
2021-12-09D300117673 30011767911.6 ppb
2021-12-09D300117674 30011768116.8 ppb
2021-12-09D300117675 30011768315.7 ppb
2022-01-11CK140951.20 ppb
2022-01-11CK14105ND
2022-02-28CK761929.00 ppb
2022-03-07CK80900ND
2022-03-09CK8351911.0 ppb
2022-03-09CK8352012.0 ppb
2022-03-09CK8352114.0 ppb
2022-03-25CK9523016.0 ppb
2022-04-18CL111749.80 ppb
2022-06-14CL56476ND
2022-06-16CL5884412.0 ppb
2022-06-16CL5884523.0 ppb
2022-06-16CL5884619.0 ppb
2022-06-16CL5884726.0 ppb
2022-06-22CL62299ND
2022-07-06CL7145712.0 ppb
2022-07-06CL71463ND
2022-07-26CL89875ND
2022-08-02CL95977ND
2022-08-15CM05635ND
2022-08-29CM178309.80 ppb
2022-09-13CM3071411.0 ppb
2022-09-13CM3069527.0 ppb
2022-09-13CM3069619.0 ppb
2022-09-13CM3069728.0 ppb
2022-12-01CM9758719.0 ppb
2022-12-01CM9758834.0 ppb
2022-12-01CM9758923.0 ppb
2022-12-01CM9759027.0 ppb
2022-12-19CN0824825.0 ppb
2023-01-03CN160529.80 ppb
2023-01-09CN19603ND
2023-01-10CN207960.540 ppb
2023-01-10CN207981.20 ppb
2023-02-13CN418584.90 ppb
2023-03-22CN6648711.0 ppb
2023-03-22CN6648819.0 ppb
2023-03-22CN6648914.0 ppb
2023-03-22CN6649018.0 ppb
2023-05-10CO033686.70 ppb
2023-06-13CO27277ND
2023-06-15CO3199616.0 ppb
2023-06-15CO3199727.0 ppb
2023-06-15CO3199823.0 ppb
2023-06-15CO3199925.0 ppb
2023-09-05CO9068340.0 ppb
2023-09-05CO9068446.0 ppb
2023-09-05CO9068540.0 ppb
2023-09-05CO9068651.0 ppb
2023-09-18CP0242915.0 ppb
2023-11-28CP5532213.0 ppb
2023-11-29CP56431ND
2023-12-07CP6507822.0 ppb
2023-12-07CP6507948.0 ppb
2023-12-07CP6508029.0 ppb
2023-12-07CP6508137.0 ppb