Know Your Environment. Protect Your Health.

Chloroform

Essex Fells 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.

 

103

Samples

0

Samples exceeding legal limit (MCL)

19

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20184.13 ppb195ND - 33.6 ppb
20190.264 ppb223ND - 4.75 ppb
20200.0255 ppb201ND - 0.510 ppb
20210.764 ppb186ND - 9.01 ppb
20220.118 ppb121ND - 1.41 ppb
20230.344 ppb123ND - 2.62 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
2018-02-20DWSC4808-1ND
2018-02-20DWSC4808-3ND
2018-03-19A25930ND
2018-03-19A2593111.4 ppb
2018-05-17DWSC5332-1ND
2018-05-17DWSC5332-3ND
2018-06-19DWSC5563-723.4 ppb
2018-06-19DWSC5563-833.6 ppb
2018-06-21DWSC5617-1ND
2018-09-1918091936-070.550 ppb
2018-09-1918091936-08ND
2018-09-1918091936-01ND
2018-09-1918091936-03ND
2018-09-1918091936-09ND
2018-11-2018112107-01ND
2018-11-2018112107-03ND
2018-11-2018112107-06ND
2018-12-1918122107-079.42 ppb
2018-12-1918122107-08ND
2019-02-1919022005-01ND
2019-02-1919022005-03ND
2019-03-1219031302-07ND
2019-03-1219031302-08ND
2019-03-2919032916-01ND
2019-06-0619060539-01ND
2019-06-0619060539-03ND
2019-06-0619060539-06ND
2019-06-1919062014-004ND
2019-06-1919062014-005ND
2019-08-2019081917-006ND
2019-08-2019081917-004ND
2019-08-2019081917-0050.510 ppb
2019-09-1819091937-006ND
2019-09-1819091937-007ND
2019-10-2219102206-001ND
2019-10-2219102206-002ND
2019-11-1919111825-002ND
2019-11-1919111825-003ND
2019-11-2519112213-0010.540 ppb
2019-12-1719121806-0044.75 ppb
2019-12-1719121806-005ND
2020-02-1820021706-001ND
2020-02-1820021706-003ND
2020-02-1820021706-006ND
2020-03-1720031720-004ND
2020-03-1720031720-005ND
2020-05-1920051817-001ND
2020-05-1920051817-003ND
2020-06-1620061728-004ND
2020-06-2520062430-001ND
2020-06-2520062431-001ND
2020-08-1820081727-001ND
2020-08-1820081727-003ND
2020-08-1820081727-006ND
2020-09-1520091603-004ND
2020-09-1520091603-005ND
2020-11-1720111617-001ND
2020-11-1720111617-002ND
2020-11-1720111617-0030.510 ppb
2020-12-1520121448-001ND
2020-12-1520121448-002ND
2021-01-1921011822-001ND
2021-01-1921011822-003ND
2021-03-1621031519-0019.01 ppb
2021-03-1621031519-002ND
2021-03-1621031517-001ND
2021-05-1821051741-001AND
2021-05-1821051741-003AND
2021-05-1821051741-002A1.57 ppb
2021-06-1521061416-001ND
2021-06-1521061416-0020.640 ppb
2021-07-20210719011-001ND
2021-07-20210719011-002ND
2021-07-20210719011-0030.810 ppb
2021-09-21210923003-0010.690 ppb
2021-09-21210923003-0021.03 ppb
2021-11-09211108063-001ND
2021-12-14211213018-001ND
2021-12-14211213018-002ND
2022-01-11220110009-001ND
2022-03-08220308010-004ND
2022-03-08220308010-005ND
2022-05-26220525017-001ND
2022-06-14220615013-001ND
2022-06-14220615013-003ND
2022-07-12220711038-001AND
2022-09-20220920047-0011.41 ppb
2022-09-20220920047-002ND
2022-11-08221107029-001ND
2022-12-15221213038-002ND
2022-12-15221213038-004ND
2023-01-10230109040-001ND
2023-03-14230314020-004ND
2023-03-14230314020-005ND
2023-06-13230614003-0042.62 ppb
2023-06-13230614003-005ND
2023-06-29230628020-001ND
2023-07-11230710028-001AND
2023-09-12230912016-0040.950 ppb
2023-09-12230912016-005ND
2023-11-14231113030-001ND
2023-12-12231212037-0040.560 ppb
2023-12-12231212037-005ND