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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

City of Auburn

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.

 

175

Samples

0

Samples exceeding legal limit (MCL)

154

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20122.35 ppb1310ND - 7.00 ppb
20133.41 ppb3329ND - 37.3 ppb
20143.29 ppb32320.300 ppb - 13.4 ppb
20153.59 ppb32320.400 ppb - 11.2 ppb
20163.63 ppb3332ND - 32.4 ppb
20173.49 ppb32320.400 ppb - 20.2 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
2012-07-0571553ND
2012-07-0571554ND
2012-07-0571555ND
2012-08-01716695.50 ppb
2012-08-01716701.30 ppb
2012-11-01720732.40 ppb
2012-11-01720773.20 ppb
2012-11-01720711.000 ppb
2012-11-01720761.10 ppb
2012-11-01720743.90 ppb
2012-11-01720707.00 ppb
2012-11-01720724.20 ppb
2012-11-01720750.900 ppb
2013-02-07722611.10 ppb
2013-02-07722571.50 ppb
2013-02-07722594.60 ppb
2013-02-07722601.20 ppb
2013-02-07722563.50 ppb
2013-02-07722580.400 ppb
2013-02-07722630.400 ppb
2013-02-07722622.40 ppb
2013-05-08724493.10 ppb
2013-05-08724463.00 ppb
2013-05-08724511.20 ppb
2013-05-08724450.300 ppb
2013-05-08724520.500 ppb
2013-05-08724471.90 ppb
2013-05-08724482.40 ppb
2013-05-08724503.10 ppb
2013-07-0272565ND
2013-08-08727712.80 ppb
2013-08-08727741.20 ppb
2013-08-0872773ND
2013-08-08727680.400 ppb
2013-08-08727691.30 ppb
2013-08-0872770ND
2013-08-08727722.00 ppb
2013-08-08727674.10 ppb
2013-11-0773148ND
2013-11-07731513.00 ppb
2013-11-07731479.40 ppb
2013-11-07731501.60 ppb
2013-11-077314612.2 ppb
2013-11-07731495.90 ppb
2013-11-07731450.600 ppb
2013-11-077314437.3 ppb
2014-02-11733351.000 ppb
2014-02-11733391.000 ppb
2014-02-11733371.40 ppb
2014-02-11733340.700 ppb
2014-02-11733330.600 ppb
2014-02-11733381.000 ppb
2014-02-11733360.300 ppb
2014-02-11733323.40 ppb
2014-05-07735374.40 ppb
2014-05-07735362.60 ppb
2014-05-077353313.0 ppb
2014-05-07735353.40 ppb
2014-05-07735380.300 ppb
2014-05-07735391.20 ppb
2014-05-07735342.00 ppb
2014-05-07735320.300 ppb
2014-08-287410411.6 ppb
2014-08-287410013.4 ppb
2014-08-28741030.400 ppb
2014-08-28740997.80 ppb
2014-08-28741023.30 ppb
2014-08-28741051.90 ppb
2014-08-28740980.400 ppb
2014-08-28741014.50 ppb
2014-11-18745350.800 ppb
2014-11-18745292.40 ppb
2014-11-18745288.80 ppb
2014-11-18745312.10 ppb
2014-11-18745344.90 ppb
2014-11-18745320.600 ppb
2014-11-18745330.700 ppb
2014-11-18745305.00 ppb
2015-02-11747630.500 ppb
2015-02-11747650.400 ppb
2015-02-11747663.70 ppb
2015-02-11747642.00 ppb
2015-02-11747672.50 ppb
2015-02-11747682.90 ppb
2015-02-11747621.80 ppb
2015-02-11747610.900 ppb
2015-05-21750200.600 ppb
2015-05-21750210.600 ppb
2015-05-21750176.20 ppb
2015-05-21750221.90 ppb
2015-05-21750182.60 ppb
2015-05-21750192.40 ppb
2015-05-21750153.80 ppb
2015-05-21750160.500 ppb
2015-09-16754810.900 ppb
2015-09-16754840.800 ppb
2015-09-167547911.2 ppb
2015-09-16754803.30 ppb
2015-09-16754774.40 ppb
2015-09-16754823.50 ppb
2015-09-16754787.10 ppb
2015-09-16754832.20 ppb
2015-11-05756421.10 ppb
2015-11-05756431.20 ppb
2015-11-05756408.90 ppb
2015-11-05756452.60 ppb
2015-11-05756469.90 ppb
2015-11-05756419.40 ppb
2015-11-057564710.6 ppb
2015-11-05756444.50 ppb
2016-02-107.10 ppb
2016-02-101.60 ppb
2016-02-103.70 ppb
2016-02-102.00 ppb
2016-02-101.20 ppb
2016-02-101.70 ppb
2016-02-101.90 ppb
2016-02-101.50 ppb
2016-06-024.70 ppb
2016-06-028.70 ppb
2016-06-020.800 ppb
2016-06-023.60 ppb
2016-06-022.20 ppb
2016-06-020.400 ppb
2016-06-020.600 ppb
2016-06-021.30 ppb
2016-07-07ND
2016-08-101.000 ppb
2016-08-1032.4 ppb
2016-08-107.80 ppb
2016-08-105.40 ppb
2016-08-101.40 ppb
2016-08-101.000 ppb
2016-08-102.20 ppb
2016-08-104.50 ppb
2016-11-032.10 ppb
2016-11-033.70 ppb
2016-11-030.500 ppb
2016-11-030.500 ppb
2016-11-035.60 ppb
2016-11-030.800 ppb
2016-11-031.90 ppb
2016-11-035.90 ppb
2017-03-223.20 ppb
2017-03-220.600 ppb
2017-03-221.50 ppb
2017-03-221.80 ppb
2017-03-221.90 ppb
2017-03-221.80 ppb
2017-03-221.90 ppb
2017-03-222.10 ppb
2017-05-040.400 ppb
2017-05-046.10 ppb
2017-05-042.80 ppb
2017-05-046.90 ppb
2017-05-041.90 ppb
2017-05-041.60 ppb
2017-05-0420.2 ppb
2017-05-044.50 ppb
2017-08-151.50 ppb
2017-08-153.00 ppb
2017-08-154.00 ppb
2017-08-158.40 ppb
2017-08-152.50 ppb
2017-08-150.400 ppb
2017-08-159.10 ppb
2017-08-151.40 ppb
2017-11-152.80 ppb
2017-11-151.10 ppb
2017-11-157.30 ppb
2017-11-154.80 ppb
2017-11-151.60 ppb
2017-11-150.600 ppb
2017-11-152.10 ppb
2017-11-151.90 ppb