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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Sandy City 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.

 

168

Samples

0

Samples exceeding legal limit (MCL)

109

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20125.17 ppb2912ND - 35.6 ppb
201310.8 ppb3331ND - 26.5 ppb
20142.02 ppb4017ND - 9.90 ppb
201513.8 ppb2318ND - 45.5 ppb
20169.34 ppb2515ND - 27.3 ppb
201721.0 ppb1816ND - 55.9 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 Result
2012-06-15ND
2012-06-15ND
2012-06-15ND
2012-06-15ND
2012-08-02ND
2012-08-02ND
2012-08-03ND
2012-08-03ND
2012-08-07ND
2012-08-07ND
2012-08-08ND
2012-08-08ND
2012-08-09ND
2012-08-09ND
2012-08-280.700 ppb
2012-08-280.700 ppb
2012-09-056.90 ppb
2012-10-0114.9 ppb
2012-10-0128.1 ppb
2012-10-0112.5 ppb
2012-10-0135.6 ppb
2012-10-0122.8 ppb
2012-10-0120.1 ppb
2012-10-014.50 ppb
2012-10-01ND
2012-10-251.50 ppb
2012-10-251.50 ppb
2012-11-27ND
2012-11-27ND
2013-01-0311.2 ppb
2013-01-037.90 ppb
2013-01-039.40 ppb
2013-01-0310.00 ppb
2013-01-039.00 ppb
2013-01-034.50 ppb
2013-01-036.70 ppb
2013-01-032.90 ppb
2013-04-0110.1 ppb
2013-04-018.00 ppb
2013-04-014.50 ppb
2013-04-016.60 ppb
2013-04-015.30 ppb
2013-04-014.00 ppb
2013-04-0116.9 ppb
2013-04-012.30 ppb
2013-06-18ND
2013-06-18ND
2013-07-0223.9 ppb
2013-07-0226.5 ppb
2013-07-0219.8 ppb
2013-07-0220.6 ppb
2013-07-024.50 ppb
2013-07-0222.1 ppb
2013-07-024.40 ppb
2013-10-0121.3 ppb
2013-10-0125.1 ppb
2013-10-0111.0 ppb
2013-10-0112.5 ppb
2013-10-0115.3 ppb
2013-10-018.90 ppb
2013-10-0112.8 ppb
2013-10-017.20 ppb
2014-01-029.90 ppb
2014-01-027.50 ppb
2014-01-026.40 ppb
2014-01-025.40 ppb
2014-01-023.60 ppb
2014-01-022.70 ppb
2014-01-029.20 ppb
2014-01-022.50 ppb
2014-02-20ND
2014-02-20ND
2014-04-030.500 ppb
2014-04-037.00 ppb
2014-04-03ND
2014-04-03ND
2014-04-035.20 ppb
2014-04-03ND
2014-04-038.00 ppb
2014-04-03ND
2014-05-29ND
2014-05-290.600 ppb
2014-05-29ND
2014-05-29ND
2014-05-29ND
2014-05-290.600 ppb
2014-05-29ND
2014-05-29ND
2014-05-30ND
2014-05-30ND
2014-05-30ND
2014-05-30ND
2014-06-05ND
2014-06-05ND
2014-06-06ND
2014-06-06ND
2014-07-21ND
2014-07-21ND
2014-07-23ND
2014-07-234.10 ppb
2014-07-233.70 ppb
2014-07-233.90 ppb
2015-01-0910.7 ppb
2015-01-098.90 ppb
2015-01-0915.1 ppb
2015-01-0916.3 ppb
2015-04-06ND
2015-04-0710.3 ppb
2015-04-0717.1 ppb
2015-04-0713.0 ppb
2015-04-0711.2 ppb
2015-07-06ND
2015-07-060.700 ppb
2015-07-0722.7 ppb
2015-07-0718.3 ppb
2015-07-0719.0 ppb
2015-07-0713.0 ppb
2015-07-14ND
2015-07-16ND
2015-07-223.00 ppb
2015-10-0545.5 ppb
2015-10-0538.2 ppb
2015-10-0529.7 ppb
2015-10-0525.1 ppb
2015-11-09ND
2016-01-2219.9 ppb
2016-01-226.60 ppb
2016-01-2214.4 ppb
2016-01-2211.6 ppb
2016-03-11ND
2016-03-11ND
2016-04-192.70 ppb
2016-04-19ND
2016-04-193.70 ppb
2016-04-1911.0 ppb
2016-04-22ND
2016-06-06ND
2016-06-14ND
2016-06-17ND
2016-06-21ND
2016-06-22ND
2016-06-22ND
2016-07-1916.2 ppb
2016-07-1924.1 ppb
2016-07-1917.6 ppb
2016-07-1922.4 ppb
2016-10-0623.3 ppb
2016-10-0624.0 ppb
2016-10-068.80 ppb
2016-10-0627.3 ppb
2017-01-2014.1 ppb
2017-01-2016.9 ppb
2017-01-2013.0 ppb
2017-01-208.10 ppb
2017-04-2819.8 ppb
2017-04-2815.8 ppb
2017-04-2816.4 ppb
2017-04-2814.7 ppb
2017-06-22ND
2017-08-1732.5 ppb
2017-08-1736.6 ppb
2017-08-1723.9 ppb
2017-08-1755.9 ppb
2017-09-01ND
2017-10-3038.7 ppb
2017-10-3018.5 ppb
2017-10-3021.2 ppb
2017-10-3031.9 ppb