Know Your Environment. Protect Your Health.

Chloroform

Purcellville, Town of

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.

 

112

Samples

0

Samples exceeding legal limit (MCL)

69

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201812.2 ppb1610ND - 34.0 ppb
201911.6 ppb189ND - 60.0 ppb
202016.4 ppb1410ND - 61.0 ppb
202112.6 ppb2315ND - 43.0 ppb
202213.9 ppb2214ND - 78.0 ppb
202312.2 ppb1911ND - 63.0 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
2018-02-15E18010032718.0 ppb
2018-02-15E18010033524.0 ppb
2018-02-27E180100342ND
2018-05-14E18030386227.0 ppb
2018-05-14E18030386417.0 ppb
2018-05-23E1803038502.60 ppb
2018-05-30E180303851ND
2018-08-15E18060196721.0 ppb
2018-08-15E18060196934.0 ppb
2018-08-21E180601975ND
2018-08-28E1806019710.700 ppb
2018-08-28E180601981ND
2018-11-14E18090139820.0 ppb
2018-11-14E18090140031.0 ppb
2018-11-19E180901410ND
2018-12-11E180901404ND
2019-02-13E18110401216.0 ppb
2019-02-13E18110401712.0 ppb
2019-02-19E181104004ND
2019-02-19E181104015ND
2019-02-19E181104016ND
2019-03-21E190302948ND
2019-03-21E190302957ND
2019-05-14E19030484124.0 ppb
2019-05-14E19030485515.0 ppb
2019-05-29E1903048391.80 ppb
2019-05-29E190304846ND
2019-08-13E19060994260.0 ppb
2019-08-13E19060995533.0 ppb
2019-09-10E190900749ND
2019-11-13E19100025930.0 ppb
2019-11-13E19100026117.0 ppb
2019-11-25E191000255ND
2019-12-04E191000266ND
2020-02-12E19120366423.0 ppb
2020-02-12E19120366618.0 ppb
2020-02-25E191203663ND
2020-05-19E20030229515.0 ppb
2020-05-19E20030231115.0 ppb
2020-05-20E2003022981.60 ppb
2020-06-16E200600508ND
2020-08-11E20060127461.0 ppb
2020-08-11E2006012750.500 ppb
2020-08-11E20060128331.0 ppb
2020-10-19E200906213ND
2020-11-16E20090620537.0 ppb
2020-11-16E20090620627.0 ppb
2020-11-16E200906214ND
2021-02-16E2101001129.20 ppb
2021-02-16E21010012212.0 ppb
2021-03-15E210100113ND
2021-05-12E21040062919.0 ppb
2021-05-12E21040063612.0 ppb
2021-05-12E21040065412.0 ppb
2021-05-12E2104006553.40 ppb
2021-05-17E2104006283.90 ppb
2021-05-24E210400643ND
2021-08-11E21070194843.0 ppb
2021-08-11E21070194929.0 ppb
2021-08-11E21070311910.00 ppb
2021-08-11E21070312043.0 ppb
2021-08-23E210701941ND
2021-08-23E210701945ND
2021-08-23E210705571ND
2021-11-15E21090197424.0 ppb
2021-11-15E21090197532.0 ppb
2021-11-15E21090197631.0 ppb
2021-11-15E2109019775.50 ppb
2021-11-30E210901978ND
2021-11-30E210901979ND
2021-11-30E211100054ND
2022-02-16E21120166014.0 ppb
2022-02-16E2112016614.10 ppb
2022-02-16E21120166220.0 ppb
2022-02-16E21120166317.0 ppb
2022-02-23E211201664ND
2022-02-23E211201665ND
2022-02-23E211201666ND
2022-02-23E211206105ND
2022-05-16E2203036904.60 ppb
2022-05-16E22030369124.0 ppb
2022-05-16E22030369224.0 ppb
2022-05-16E22030369333.0 ppb
2022-05-23E220303694ND
2022-05-23E2203036951.60 ppb
2022-06-29E220607528ND
2022-08-17E22080246178.0 ppb
2022-08-22E2206075160.600 ppb
2022-09-01E22080428138.0 ppb
2022-11-14E22090438417.0 ppb
2022-11-14E22090438529.0 ppb
2022-11-14E220904386ND
2022-11-14E220904387ND
2023-02-13E22120395110.00 ppb
2023-02-13E22120395214.0 ppb
2023-02-13E221203953ND
2023-05-01E2303053981.80 ppb
2023-05-01E230305409ND
2023-05-01E230305414ND
2023-05-16E23030464535.0 ppb
2023-05-16E23030464620.0 ppb
2023-05-17E2303053863.30 ppb
2023-05-17E230305403ND
2023-05-17E230305420ND
2023-05-17E230305423ND
2023-08-15E23060337963.0 ppb
2023-08-15E23060338034.0 ppb
2023-08-28E230603381ND
2023-11-01E2309047140.900 ppb
2023-11-20E23090361728.0 ppb
2023-11-20E23090361821.0 ppb
2023-12-07E230903619ND