Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloroform

Polk County Water Authority

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

 

106

Samples

0

Samples exceeding legal limit (MCL)

38

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.471 ppb174ND - 2.90 ppb
20150.319 ppb174ND - 1.90 ppb
20160.953 ppb196ND - 5.90 ppb
20171.44 ppb177ND - 6.20 ppb
20181.24 ppb178ND - 6.80 ppb
20190.787 ppb199ND - 3.80 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
2014-03-13AI36005ND
2014-03-13AI360061.90 ppb
2014-03-13AI36007ND
2014-03-13AI36008ND
2014-04-29AI389361.10 ppb
2014-06-12AI43149ND
2014-06-12AI431502.90 ppb
2014-06-12AI43151ND
2014-06-12AI43152ND
2014-09-09AI52856ND
2014-09-09AI528572.10 ppb
2014-09-09AI52858ND
2014-09-09AI52859ND
2014-12-08AI60839ND
2014-12-08AI60840ND
2014-12-08AI60841ND
2014-12-08AI60842ND
2015-03-09AI68502ND
2015-03-09AI685031.20 ppb
2015-03-09AI68504ND
2015-03-09AI68505ND
2015-03-25AI696700.530 ppb
2015-06-09AI79258ND
2015-06-09AI792591.90 ppb
2015-06-09AI79260ND
2015-06-09AI79261ND
2015-09-08AI89014ND
2015-09-08AI890151.80 ppb
2015-09-08AI89016ND
2015-09-08AI89017ND
2015-12-14AJ02729ND
2015-12-14AJ02730ND
2015-12-14AJ02731ND
2015-12-14AJ02732ND
2016-03-14AJ081111.10 ppb
2016-03-14AJ08112ND
2016-03-14AJ08113ND
2016-03-14AJ081141.20 ppb
2016-04-04AJ09249ND
2016-04-04AJ09250ND
2016-04-04AJ092515.90 ppb
2016-06-13AJ13978ND
2016-06-13AJ139793.00 ppb
2016-06-13AJ13980ND
2016-06-13AJ13981ND
2016-09-13AJ270061.40 ppb
2016-09-13AJ270075.50 ppb
2016-09-13AJ27008ND
2016-09-13AJ27009ND
2016-12-12AJ36565ND
2016-12-12AJ36566ND
2016-12-12AJ36567ND
2016-12-12AJ36568ND
2017-03-14AJ480311.10 ppb
2017-03-14AJ480322.10 ppb
2017-03-14AJ48033ND
2017-03-14AJ48034ND
2017-06-06AJ567736.20 ppb
2017-06-06AJ567914.10 ppb
2017-06-06AJ567924.40 ppb
2017-06-06AJ567931.70 ppb
2017-06-06AJ567944.90 ppb
2017-09-11AJ67459ND
2017-09-11AJ67460ND
2017-09-11AJ67461ND
2017-09-11AJ67462ND
2017-12-12AJ75271ND
2017-12-12AJ75272ND
2017-12-12AJ75273ND
2017-12-12AJ75274ND
2018-03-13AJ858651.60 ppb
2018-03-13AJ858662.60 ppb
2018-03-13AJ858671.20 ppb
2018-03-13AJ858681.10 ppb
2018-05-14AJ894036.80 ppb
2018-06-11AJ91168ND
2018-06-11AJ91169ND
2018-06-11AJ91170ND
2018-06-11AJ91171ND
2018-09-11AK00508ND
2018-09-11AK00509ND
2018-09-11AK00510ND
2018-09-11AK00511ND
2018-12-05AK073551.90 ppb
2018-12-05AK07356ND
2018-12-05AK073572.30 ppb
2018-12-05AK073583.50 ppb
2019-03-11AK130061.90 ppb
2019-03-11AK130073.80 ppb
2019-03-11AK130081.20 ppb
2019-03-11AK130091.90 ppb
2019-04-29AK15975ND
2019-04-29AK159760.550 ppb
2019-04-29AK159771.50 ppb
2019-06-11AK194031.10 ppb
2019-06-11AK194041.90 ppb
2019-06-11AK19405ND
2019-06-11AK19406ND
2019-09-10AK299661.10 ppb
2019-09-10AK29967ND
2019-09-10AK29968ND
2019-09-10AK29969ND
2019-12-10AK37966ND
2019-12-10AK37967ND
2019-12-10AK37968ND
2019-12-10AK37969ND