Know Your Environment. Protect Your Health.

Chloroform

Wallingford 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.

 

130

Samples

0

Samples exceeding legal limit (MCL)

103

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201838.4 ppb2217ND - 87.0 ppb
201934.5 ppb2217ND - 73.0 ppb
202026.2 ppb2218ND - 50.8 ppb
202128.4 ppb2217ND - 69.0 ppb
202228.3 ppb2117ND - 50.0 ppb
202333.0 ppb2117ND - 73.0 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
2018-03-05BZ9817329.0 ppb
2018-03-05BZ9817141.0 ppb
2018-03-05BZ9817033.0 ppb
2018-03-05BZ9817236.0 ppb
2018-03-05BZ98169ND
2018-04-17CA21065ND
2018-06-07CA6606143.0 ppb
2018-06-07CA6606266.0 ppb
2018-06-07CA6606352.0 ppb
2018-06-07CA6606461.0 ppb
2018-06-28CA8040723.0 ppb
2018-07-17CA91980ND
2018-08-14CB11135ND
2018-09-13CB3062757.0 ppb
2018-09-13CB3062875.0 ppb
2018-09-13CB3062971.0 ppb
2018-09-13CB3063087.0 ppb
2018-10-11CB69933ND
2018-12-13CC1358430.0 ppb
2018-12-13CC1358550.0 ppb
2018-12-13CC1358640.0 ppb
2018-12-13CC1358750.0 ppb
2019-02-21CC55842-02ND
2019-03-06CC62592-029.20 ppb
2019-03-06CC62591-02ND
2019-03-14CC6779325.0 ppb
2019-03-14CC6779638.0 ppb
2019-03-14CC6779433.0 ppb
2019-03-14CC6779541.0 ppb
2019-04-08CC90384ND
2019-06-06CD2858847.0 ppb
2019-06-06CD2858961.0 ppb
2019-06-06CD2859059.0 ppb
2019-06-06CD2859167.0 ppb
2019-07-08CD51593ND
2019-09-123389-167.9 ppb
2019-09-123389-266.0 ppb
2019-09-123389-360.8 ppb
2019-09-123389-473.0 ppb
2019-10-10CE30938-VOCND
2019-12-053412-121.1 ppb
2019-12-053412-231.9 ppb
2019-12-053412-325.1 ppb
2019-12-053412-432.3 ppb
2020-02-03CF251566.00 ppb
2020-02-05CF27861ND
2020-03-043443-121.0 ppb
2020-03-043443-234.7 ppb
2020-03-043443-329.2 ppb
2020-03-043443-432.7 ppb
2020-03-11CF48935ND
2020-04-08CF71118ND
2020-06-033481-139.4 ppb
2020-06-033481-245.8 ppb
2020-06-033481-345.1 ppb
2020-06-033481-450.8 ppb
2020-08-12CG530271.10 ppb
2020-09-023513-137.7 ppb
2020-09-023513-241.6 ppb
2020-09-023513-340.6 ppb
2020-09-023513-450.3 ppb
2020-10-07CG95538ND
2020-12-023544-121.7 ppb
2020-12-023544-223.3 ppb
2020-12-023544-329.7 ppb
2020-12-023544-426.1 ppb
2021-02-03CH55990-VOCND
2021-03-03CH7131517.0 ppb
2021-03-03CH7131629.0 ppb
2021-03-03CH7131720.0 ppb
2021-03-03CH7131826.0 ppb
2021-03-10CH75493ND
2021-04-07CH940076.80 ppb
2021-04-07CH94005ND
2021-06-09CI5194832.0 ppb
2021-06-09CI5194942.0 ppb
2021-06-09CI5195039.0 ppb
2021-06-09CI5195139.0 ppb
2021-09-01CJ1767551.0 ppb
2021-09-01CJ1767658.0 ppb
2021-09-01CJ1767758.0 ppb
2021-09-01CJ1767869.0 ppb
2021-09-15CJ30037ND
2021-10-06CJ50288ND
2021-12-08CJ9358225.0 ppb
2021-12-08CJ9358336.0 ppb
2021-12-08CJ9358437.0 ppb
2021-12-08CJ9358539.0 ppb
2022-02-07CK32469-VOC7.80 ppb
2022-03-02CK7726919.0 ppb
2022-03-02CK7727026.0 ppb
2022-03-02CK7727125.0 ppb
2022-03-02CK7727220.0 ppb
2022-03-09CK82546ND
2022-04-06CL02035-VOCND
2022-06-09CL5304242.0 ppb
2022-06-09CL5304350.0 ppb
2022-06-09CL5304450.0 ppb
2022-06-09CL5304546.0 ppb
2022-08-10CM01614ND
2022-09-01CM2068232.0 ppb
2022-09-01CM2068350.0 ppb
2022-09-01CM2068440.0 ppb
2022-09-01CM2068547.0 ppb
2022-11-16CM86907ND
2022-12-08CN0037828.0 ppb
2022-12-08CN0037934.0 ppb
2022-12-08CN0038037.0 ppb
2022-12-08CN0038140.0 ppb
2023-01-11CN21046ND
2023-02-06CN363837.40 ppb
2023-03-01CN5158320.0 ppb
2023-03-01CN5158436.0 ppb
2023-03-01CN5158532.0 ppb
2023-03-01CN5158633.0 ppb
2023-04-12CN81747ND
2023-06-09CO2419236.0 ppb
2023-06-09CO2419347.0 ppb
2023-06-09CO2419442.0 ppb
2023-06-09CO2419546.0 ppb
2023-07-12CO49576ND
2023-09-07C09260267.0 ppb
2023-09-07CO9260151.0 ppb
2023-09-07CO9260366.0 ppb
2023-09-07CO9260473.0 ppb
2023-10-26CP34585ND
2023-12-14CP6870128.0 ppb
2023-12-14CP6870235.0 ppb
2023-12-14CP6870337.0 ppb
2023-12-14CP6870637.0 ppb