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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Puyallup

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

 

188

Samples

0

Samples exceeding legal limit (MCL)

101

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.58 ppb3819ND - 22.9 ppb
20152.71 ppb3222ND - 28.3 ppb
20163.06 ppb3221ND - 31.8 ppb
20172.42 ppb3319ND - 22.8 ppb
20181.75 ppb3322ND - 12.9 ppb
20193.88 ppb2011ND - 31.1 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
2014-02-11733250.700 ppb
2014-02-1173331ND
2014-02-11733271.000 ppb
2014-02-1173330ND
2014-02-117332611.4 ppb
2014-02-1173329ND
2014-02-11733280.300 ppb
2014-02-11733240.300 ppb
2014-05-06735151.50 ppb
2014-05-06735210.600 ppb
2014-05-0673514ND
2014-05-06735196.70 ppb
2014-05-06735200.600 ppb
2014-05-0673518ND
2014-05-06735160.600 ppb
2014-05-0673517ND
2014-07-0873732ND
2014-07-0873731ND
2014-07-0873733ND
2014-07-0973750ND
2014-07-0973751ND
2014-07-09737521.60 ppb
2014-08-0873950ND
2014-08-08739511.20 ppb
2014-08-08739541.000 ppb
2014-08-087395322.9 ppb
2014-08-0873955ND
2014-08-0873948ND
2014-08-0873949ND
2014-08-08739526.20 ppb
2014-11-17745171.60 ppb
2014-11-17745202.10 ppb
2014-11-1774516ND
2014-11-177451418.4 ppb
2014-11-1774521ND
2014-11-1774518ND
2014-11-177451919.3 ppb
2014-11-1774515ND
2015-02-1074752ND
2015-02-10747490.700 ppb
2015-02-10747500.700 ppb
2015-02-10747470.800 ppb
2015-02-10747531.000 ppb
2015-02-1074751ND
2015-02-1074746ND
2015-02-107474828.3 ppb
2015-05-0774983ND
2015-05-07749810.800 ppb
2015-05-07749771.60 ppb
2015-05-07749802.00 ppb
2015-05-07749820.500 ppb
2015-05-07749780.300 ppb
2015-05-0774979ND
2015-05-077497614.4 ppb
2015-08-0575262ND
2015-08-05752610.500 ppb
2015-08-05752572.30 ppb
2015-08-05752632.50 ppb
2015-08-05752590.900 ppb
2015-08-0575260ND
2015-08-0575258ND
2015-08-057525611.4 ppb
2015-11-1075671ND
2015-11-10756700.400 ppb
2015-11-10756751.40 ppb
2015-11-10756740.500 ppb
2015-11-1075668ND
2015-11-10756730.600 ppb
2015-11-10756721.30 ppb
2015-11-107566913.7 ppb
2016-02-02ND
2016-02-0218.6 ppb
2016-02-02ND
2016-02-02ND
2016-02-020.700 ppb
2016-02-020.400 ppb
2016-02-020.500 ppb
2016-02-020.400 ppb
2016-05-040.600 ppb
2016-05-04ND
2016-05-040.400 ppb
2016-05-044.20 ppb
2016-05-041.50 ppb
2016-05-041.20 ppb
2016-05-041.50 ppb
2016-05-04ND
2016-08-09ND
2016-08-090.700 ppb
2016-08-092.00 ppb
2016-08-092.90 ppb
2016-08-091.90 ppb
2016-08-0931.8 ppb
2016-08-09ND
2016-08-09ND
2016-11-141.30 ppb
2016-11-1424.8 ppb
2016-11-140.900 ppb
2016-11-140.500 ppb
2016-11-14ND
2016-11-141.10 ppb
2016-11-14ND
2016-11-14ND
2017-02-06ND
2017-02-060.300 ppb
2017-02-06ND
2017-02-0614.3 ppb
2017-02-060.400 ppb
2017-02-06ND
2017-02-060.600 ppb
2017-02-06ND
2017-05-25ND
2017-05-250.800 ppb
2017-05-250.300 ppb
2017-05-250.500 ppb
2017-05-251.30 ppb
2017-05-2519.6 ppb
2017-05-250.600 ppb
2017-05-25ND
2017-08-01ND
2017-08-01ND
2017-08-011.40 ppb
2017-08-01ND
2017-08-011.20 ppb
2017-08-011.70 ppb
2017-08-0122.8 ppb
2017-08-01ND
2017-11-1310.7 ppb
2017-11-130.900 ppb
2017-11-13ND
2017-11-131.000 ppb
2017-11-13ND
2017-11-130.800 ppb
2017-11-13ND
2017-11-130.500 ppb
2017-12-28ND
2018-02-0611.6 ppb
2018-02-06ND
2018-02-060.400 ppb
2018-02-060.500 ppb
2018-02-060.800 ppb
2018-02-061.000 ppb
2018-02-060.400 ppb
2018-02-06ND
2018-05-0312.9 ppb
2018-05-03ND
2018-05-030.700 ppb
2018-05-030.500 ppb
2018-05-030.600 ppb
2018-05-03ND
2018-05-030.500 ppb
2018-05-03ND
2018-07-311.21 ppb
2018-08-079.71 ppb
2018-08-07ND
2018-08-07ND
2018-08-07ND
2018-08-071.34 ppb
2018-08-071.09 ppb
2018-08-070.380 ppb
2018-08-07ND
2018-11-279.83 ppb
2018-11-27ND
2018-11-27ND
2018-11-270.830 ppb
2018-11-271.41 ppb
2018-11-270.520 ppb
2018-11-270.830 ppb
2018-11-270.790 ppb
2019-02-0511.3 ppb
2019-02-05ND
2019-02-05ND
2019-02-050.740 ppb
2019-02-050.800 ppb
2019-02-05ND
2019-02-05ND
2019-02-05ND
2019-05-091.63 ppb
2019-05-0911.1 ppb
2019-05-09ND
2019-05-09ND
2019-05-091.63 ppb
2019-05-091.39 ppb
2019-05-09ND
2019-05-09ND
2019-08-0115.5 ppb
2019-08-011.51 ppb
2019-11-060.980 ppb
2019-11-0631.1 ppb