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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Baker Water 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.

MORE ABOUT THIS CONTAMINANT

 

192

Samples

0

Samples exceeding legal limit (MCL)

152

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.25 ppb322ND - 20.0 ppb
20155.28 ppb3224ND - 34.9 ppb
201610.00 ppb32322.20 ppb - 30.4 ppb
201718.4 ppb323210.9 ppb - 35.2 ppb
201828.7 ppb32320.400 ppb - 65.4 ppb
201939.2 ppb323212.1 ppb - 98.2 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2014-04-0314-0241320.0 ppb
2014-04-0314-02415ND
2014-04-0314-02419ND
2014-04-0314-2417ND
2014-04-0314-0241320.0 ppb
2014-04-0314-02415ND
2014-04-0314-02419ND
2014-04-0314-2417ND
2014-07-0714-04812ND
2014-07-0714-04814ND
2014-07-0714-04816ND
2014-07-0714-04818ND
2014-07-0714-04812ND
2014-07-0714-04814ND
2014-07-0714-04816ND
2014-07-0714-04818ND
2014-09-0314-06089ND
2014-09-0314-06091ND
2014-09-0314-06093ND
2014-09-0314-06095ND
2014-09-0314-06089ND
2014-09-0314-06091ND
2014-09-0314-06093ND
2014-09-0314-06095ND
2014-12-0314-08443ND
2014-12-0314-08445ND
2014-12-0314-08447ND
2014-12-0314-08449ND
2014-12-0314-08443ND
2014-12-0314-08445ND
2014-12-0314-08447ND
2014-12-0314-08449ND
2015-03-0315-01366ND
2015-03-0315-01368ND
2015-03-0315-01370ND
2015-03-0315-01372ND
2015-03-0315-01366ND
2015-03-0315-01368ND
2015-03-0315-01370ND
2015-03-0315-01372ND
2015-06-0315-036333.00 ppb
2015-06-0315-036354.00 ppb
2015-06-0315-036372.00 ppb
2015-06-0315-036394.00 ppb
2015-06-0315-036333.00 ppb
2015-06-0315-036354.00 ppb
2015-06-0315-036372.00 ppb
2015-06-0315-036394.00 ppb
2015-09-0315-058022.63 ppb
2015-09-0315-058042.74 ppb
2015-09-0315-058062.45 ppb
2015-09-0315-058082.95 ppb
2015-09-0315-058022.63 ppb
2015-09-0315-058042.74 ppb
2015-09-0315-058062.45 ppb
2015-09-0315-058082.95 ppb
2015-12-03LA14624-134.9 ppb
2015-12-03LA14624-28.30 ppb
2015-12-03LA14624-38.20 ppb
2015-12-03LA14624-49.30 ppb
2015-12-03LA14624-134.9 ppb
2015-12-03LA14624-28.30 ppb
2015-12-03LA14624-38.20 ppb
2015-12-03LA14624-49.30 ppb
2016-03-07LA18018-19.60 ppb
2016-03-07LA18018-22.20 ppb
2016-03-07LA18018-32.50 ppb
2016-03-07LA18018-42.40 ppb
2016-03-07LA18018-19.60 ppb
2016-03-07LA18018-22.20 ppb
2016-03-07LA18018-32.50 ppb
2016-03-07LA18018-42.40 ppb
2016-06-0616-027777.07 ppb
2016-06-0616-027785.83 ppb
2016-06-0616-027796.29 ppb
2016-06-0616-027805.37 ppb
2016-06-0616-027777.07 ppb
2016-06-0616-027785.83 ppb
2016-06-0616-027796.29 ppb
2016-06-0616-027805.37 ppb
2016-09-0716-0413819.6 ppb
2016-09-0716-0413914.4 ppb
2016-09-0716-0414013.8 ppb
2016-09-0716-0414111.0 ppb
2016-09-0716-0413819.6 ppb
2016-09-0716-0413914.4 ppb
2016-09-0716-0414013.8 ppb
2016-09-0716-0414111.0 ppb
2016-12-1216-0550614.1 ppb
2016-12-1216-055078.60 ppb
2016-12-1216-0550830.4 ppb
2016-12-1216-055096.88 ppb
2016-12-1216-0550614.1 ppb
2016-12-1216-055078.60 ppb
2016-12-1216-0550830.4 ppb
2016-12-1216-055096.88 ppb
2017-03-023529874000120.3 ppb
2017-03-023529874000211.4 ppb
2017-03-023529874000319.5 ppb
2017-03-023529874000412.0 ppb
2017-03-023529874000120.3 ppb
2017-03-023529874000211.4 ppb
2017-03-023529874000319.5 ppb
2017-03-023529874000412.0 ppb
2017-06-013531577000115.0 ppb
2017-06-013531577000215.1 ppb
2017-06-013531577000310.9 ppb
2017-06-013531577000416.8 ppb
2017-06-013531577000115.0 ppb
2017-06-013531577000215.1 ppb
2017-06-013531577000310.9 ppb
2017-06-013531577000416.8 ppb
2017-09-143533584301223.3 ppb
2017-09-143533584301329.9 ppb
2017-09-143533584301416.2 ppb
2017-09-143533584301535.2 ppb
2017-09-143533584301223.3 ppb
2017-09-143533584301329.9 ppb
2017-09-143533584301416.2 ppb
2017-09-143533584301535.2 ppb
2017-12-143536376100118.6 ppb
2017-12-143536376100219.6 ppb
2017-12-143536376100313.0 ppb
2017-12-143536376100417.1 ppb
2017-12-143536376100118.6 ppb
2017-12-143536376100219.6 ppb
2017-12-143536376100313.0 ppb
2017-12-143536376100417.1 ppb
2018-03-083537917300121.4 ppb
2018-03-083537917300230.4 ppb
2018-03-083537917300311.3 ppb
2018-03-083537917300440.5 ppb
2018-03-083537917300121.4 ppb
2018-03-083537917300230.4 ppb
2018-03-083537917300311.3 ppb
2018-03-083537917300440.5 ppb
2018-06-013539601300129.8 ppb
2018-06-013539601300241.6 ppb
2018-06-013539601300313.7 ppb
2018-06-013539601300465.4 ppb
2018-06-013539601300129.8 ppb
2018-06-013539601300241.6 ppb
2018-06-013539601300313.7 ppb
2018-06-013539601300465.4 ppb
2018-09-133541811500116.4 ppb
2018-09-133541811500231.1 ppb
2018-09-133541811500315.2 ppb
2018-09-133541811500447.0 ppb
2018-09-133541811500116.4 ppb
2018-09-133541811500231.1 ppb
2018-09-133541811500315.2 ppb
2018-09-133541811500447.0 ppb
2018-12-073543585500129.2 ppb
2018-12-073543585500239.1 ppb
2018-12-073543585500327.1 ppb
2018-12-07354358550040.400 ppb
2018-12-073543585500129.2 ppb
2018-12-073543585500239.1 ppb
2018-12-073543585500327.1 ppb
2018-12-07354358550040.400 ppb
2019-03-143545544100134.5 ppb
2019-03-143545544100240.9 ppb
2019-03-143545544100312.6 ppb
2019-03-143545544100451.4 ppb
2019-03-143545544100134.5 ppb
2019-03-143545544100240.9 ppb
2019-03-143545544100312.6 ppb
2019-03-143545544100451.4 ppb
2019-06-033547373600128.9 ppb
2019-06-033547373600238.5 ppb
2019-06-033547373600312.1 ppb
2019-06-033547373600445.3 ppb
2019-06-033547373600128.9 ppb
2019-06-033547373600238.5 ppb
2019-06-033547373600312.1 ppb
2019-06-033547373600445.3 ppb
2019-09-033549546000133.8 ppb
2019-09-033549546000298.2 ppb
2019-09-033549546000317.7 ppb
2019-09-033549546000467.1 ppb
2019-09-033549546000133.8 ppb
2019-09-033549546000298.2 ppb
2019-09-033549546000317.7 ppb
2019-09-033549546000467.1 ppb
2019-12-063551835500131.9 ppb
2019-12-063551835500257.1 ppb
2019-12-063551835500323.8 ppb
2019-12-063551835500432.9 ppb
2019-12-063551835500131.9 ppb
2019-12-063551835500257.1 ppb
2019-12-063551835500323.8 ppb
2019-12-063551835500432.9 ppb