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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

City of Georgetown

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.

 

203

Samples

0

Samples exceeding legal limit (MCL)

159

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20126.90 ppb2318ND - 17.9 ppb
20134.01 ppb3528ND - 13.4 ppb
20142.75 ppb3529ND - 11.2 ppb
201510.8 ppb3523ND - 58.3 ppb
201612.5 ppb4028ND - 23.5 ppb
20178.71 ppb3533ND - 11.3 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
2012-01-19AB78190ND
2012-01-19AB781866.30 ppb
2012-01-19AB781897.50 ppb
2012-01-19AB781876.70 ppb
2012-04-12AB86778ND
2012-04-12AB867763.40 ppb
2012-04-12AB8677917.3 ppb
2012-04-12AB8677717.4 ppb
2012-07-12AB9515517.0 ppb
2012-07-12AB951511.10 ppb
2012-07-12AB951530.600 ppb
2012-07-12AB95143ND
2012-07-12AB95142ND
2012-07-12AB9514415.9 ppb
2012-07-12AB9514517.9 ppb
2012-12-11121242600110.8 ppb
2012-12-11121242600210.6 ppb
2012-12-1112124260032.30 ppb
2012-12-1112124260041.20 ppb
2012-12-11121242600510.7 ppb
2012-12-111212426006ND
2012-12-1112124260071.30 ppb
2012-12-11121242600810.8 ppb
2013-02-1213023400086.60 ppb
2013-02-1213023400096.70 ppb
2013-02-1213023400102.40 ppb
2013-02-1213023400111.10 ppb
2013-02-1213023400126.50 ppb
2013-02-1213023400131.30 ppb
2013-02-1213023400146.40 ppb
2013-02-1213023400156.80 ppb
2013-06-03Q13018270153.06 ppb
2013-06-03Q13018270165.76 ppb
2013-06-03Q1301827017ND
2013-06-03Q1301827018ND
2013-06-03Q13018270196.16 ppb
2013-06-03Q1301827020ND
2013-06-03Q1301827021ND
2013-06-03Q13018270226.42 ppb
2013-08-29Q13065830011.12 ppb
2013-08-29Q1306583003ND
2013-08-29Q13065820096.50 ppb
2013-08-29Q13065820106.00 ppb
2013-08-29Q13065820111.07 ppb
2013-08-29Q13065820121.09 ppb
2013-08-29Q13065820136.25 ppb
2013-08-29Q1306582014ND
2013-08-29Q13065820155.83 ppb
2013-08-29Q13065820166.63 ppb
2013-09-25Q13085170016.35 ppb
2013-11-18Q131368000913.4 ppb
2013-11-18Q13136800106.05 ppb
2013-11-18Q13136800115.43 ppb
2013-11-18Q13136800121.35 ppb
2013-11-18Q13136800135.96 ppb
2013-11-18Q1313680014ND
2013-11-18Q13136800151.20 ppb
2013-11-18Q13136800167.01 ppb
2014-02-26AC447673.90 ppb
2014-02-26AC447723.90 ppb
2014-02-26AC447661.50 ppb
2014-02-26AC44770ND
2014-02-26AC447693.50 ppb
2014-02-26AC44773ND
2014-02-26AC447712.90 ppb
2014-02-26AC447683.20 ppb
2014-06-04AC560124.00 ppb
2014-06-04AC560343.50 ppb
2014-06-04AC560213.80 ppb
2014-06-04AC56023ND
2014-06-04AC56022ND
2014-06-04AC560162.10 ppb
2014-06-04AC560153.70 ppb
2014-06-04AC56013ND
2014-09-25AC682583.90 ppb
2014-09-25AC682641.000 ppb
2014-09-25AC682600.700 ppb
2014-09-25AC6830011.2 ppb
2014-09-25AC683014.90 ppb
2014-09-25AC683095.10 ppb
2014-09-25AC683031.50 ppb
2014-09-25AC682994.80 ppb
2014-09-25AC683101.000 ppb
2014-09-25AC683041.80 ppb
2014-09-25AC683026.10 ppb
2014-12-05AC737193.50 ppb
2014-12-05AC737123.10 ppb
2014-12-05AC737141.50 ppb
2014-12-05AC737161.000 ppb
2014-12-05AC737173.00 ppb
2014-12-05AC73713ND
2014-12-05AC737182.40 ppb
2014-12-05AC737153.90 ppb
2015-03-05AC826822.20 ppb
2015-03-05AC826852.10 ppb
2015-03-05AC827151.30 ppb
2015-03-05AC827161.10 ppb
2015-03-05AC827144.50 ppb
2015-03-05AC82683ND
2015-03-05AC826841.40 ppb
2015-03-05AC827174.10 ppb
2015-06-11AC9578918.5 ppb
2015-06-11AC9578617.9 ppb
2015-06-11AC957874.00 ppb
2015-06-11AC95794ND
2015-06-11AC9578518.6 ppb
2015-06-11AC95788ND
2015-06-11AC95790ND
2015-06-11AC9579219.1 ppb
2015-09-15AD0714921.0 ppb
2015-09-15AD07147ND
2015-09-15AD07139ND
2015-09-15AD0709329.3 ppb
2015-09-15AD0709527.3 ppb
2015-09-15AD070874.20 ppb
2015-09-15AD07092ND
2015-09-15AD0710325.6 ppb
2015-09-15AD07096ND
2015-09-15AD07097ND
2015-09-15AD0709427.9 ppb
2015-12-10AD1647558.3 ppb
2015-12-10AD1648525.9 ppb
2015-12-10AD164866.70 ppb
2015-12-10AD16478ND
2015-12-10AD1649228.4 ppb
2015-12-10AD16479ND
2015-12-10AD16491ND
2015-12-10AD1647729.8 ppb
2016-02-09AD2267918.0 ppb
2016-02-09AD2268316.7 ppb
2016-02-09AD226814.60 ppb
2016-02-09AD22684ND
2016-02-09AD2268217.6 ppb
2016-02-09AD22702ND
2016-02-09AD22685ND
2016-02-09AD2269816.7 ppb
2016-04-21AD3374518.5 ppb
2016-04-21AD3374015.3 ppb
2016-04-21AD337442.50 ppb
2016-04-21AD33741ND
2016-04-21AD3374220.5 ppb
2016-04-21AD33743ND
2016-04-21AD337461.20 ppb
2016-04-21AD3374720.6 ppb
2016-04-21AD33769ND
2016-09-09AD4863023.0 ppb
2016-09-09AD48634ND
2016-09-09AD48628ND
2016-09-09AD4861721.8 ppb
2016-09-09AD4861821.2 ppb
2016-09-09AD486117.30 ppb
2016-09-09AD48609ND
2016-09-09AD4860723.1 ppb
2016-09-09AD48612ND
2016-09-09AD4862416.7 ppb
2016-09-09AD4861023.0 ppb
2016-10-27AD5506723.1 ppb
2016-10-27AD5505620.1 ppb
2016-10-27AD5506422.2 ppb
2016-10-27AD55063ND
2016-10-27AD5506121.3 ppb
2016-10-27AD55057ND
2016-10-27AD5505917.7 ppb
2016-10-27AD5506021.2 ppb
2016-10-27AD5506219.8 ppb
2016-10-27AD5506521.8 ppb
2016-10-27AD5505821.0 ppb
2016-10-27AD5506623.5 ppb
2017-01-23AD6603410.5 ppb
2017-01-23AD660279.50 ppb
2017-01-23AD660159.30 ppb
2017-01-23AD6602810.5 ppb
2017-01-23AD6602910.3 ppb
2017-01-23AD6603710.9 ppb
2017-01-23AD660386.70 ppb
2017-01-23AD6603010.2 ppb
2017-04-05AD784838.60 ppb
2017-04-05AD784789.30 ppb
2017-04-05AD784768.80 ppb
2017-04-05AD784758.30 ppb
2017-04-05AD784868.30 ppb
2017-04-05AD784849.60 ppb
2017-04-05AD784808.30 ppb
2017-04-05AD784729.00 ppb
2017-07-06AD885069.20 ppb
2017-07-06AD88510ND
2017-07-06AD88508ND
2017-07-06AD884657.80 ppb
2017-07-06AD884637.60 ppb
2017-07-06AD884647.60 ppb
2017-07-06AD884609.90 ppb
2017-07-06AD884618.10 ppb
2017-07-06AD884668.40 ppb
2017-07-06AD884625.50 ppb
2017-07-06AD884597.30 ppb
2017-10-13AE0065210.3 ppb
2017-10-13AE0065310.9 ppb
2017-10-13AE0065410.8 ppb
2017-10-13AE0065511.0 ppb
2017-10-13AE0065610.4 ppb
2017-10-13AE0065711.3 ppb
2017-10-13AE0065810.2 ppb
2017-10-13AE0065910.3 ppb