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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Sioux City Water Supply

Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

192

Samples

0

Samples exceeding legal limit (MCL)

85

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.378 ppb3219ND - 0.900 ppb
20150.353 ppb3217ND - 0.900 ppb
20160.488 ppb3219ND - 1.30 ppb
20170.422 ppb3217ND - 1.50 ppb
20180.425 ppb3217ND - 1.20 ppb
20190.581 ppb3219ND - 2.10 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for bromoform 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
2014-02-102034449ND
2014-02-102034450ND
2014-02-1020344510.500 ppb
2014-02-102034452ND
2014-02-1020344530.500 ppb
2014-02-102034454ND
2014-02-1020344550.500 ppb
2014-02-102034456ND
2014-05-192052125ND
2014-05-1920521260.800 ppb
2014-05-192052127ND
2014-05-192052128ND
2014-05-192052130ND
2014-05-192052132ND
2014-05-1920521330.500 ppb
2014-05-1920521340.600 ppb
2014-08-192073351ND
2014-08-1920733520.500 ppb
2014-08-1920733530.700 ppb
2014-08-1920733540.900 ppb
2014-08-192073355ND
2014-08-1920733560.500 ppb
2014-08-1920733570.800 ppb
2014-08-1920733590.700 ppb
2014-11-182093487ND
2014-11-1820934880.700 ppb
2014-11-1820934890.800 ppb
2014-11-1820934900.600 ppb
2014-11-1820934970.500 ppb
2014-11-1820932960.800 ppb
2014-11-1820932970.600 ppb
2014-11-1820932980.600 ppb
2015-02-24OE215607ND
2015-02-24OE215610ND
2015-02-24OE215609ND
2015-02-24OE215608ND
2015-02-24OE215611ND
2015-02-24OE215612ND
2015-02-24OE215613ND
2015-02-24OE215614ND
2015-05-10OE2415680.500 ppb
2015-05-11OE2415620.500 ppb
2015-05-11OE2415630.600 ppb
2015-05-11OE2415650.700 ppb
2015-05-11OE241564ND
2015-05-11OE241566ND
2015-05-11OE2415670.600 ppb
2015-05-11OE2415690.500 ppb
2015-08-24OE2849800.700 ppb
2015-08-24OE284977ND
2015-08-24OE2849810.500 ppb
2015-08-24OE284974ND
2015-08-24OE284975ND
2015-08-24OE284976ND
2015-08-24OE284979ND
2015-08-24OE2849780.700 ppb
2015-11-17OE3185340.800 ppb
2015-11-17OE3185350.900 ppb
2015-11-17OE3185360.800 ppb
2015-11-17OE3185370.800 ppb
2015-11-17OE3185380.500 ppb
2015-11-17OE3185390.600 ppb
2015-11-17OE3185400.800 ppb
2015-11-17OE3185410.800 ppb
2016-02-10OE343935ND
2016-02-10OE343936ND
2016-02-10OE3439380.800 ppb
2016-02-10OE343942ND
2016-02-10OE343937ND
2016-02-10OE343941ND
2016-02-10OE3439390.800 ppb
2016-02-10OE3439400.600 ppb
2016-05-11OE376952ND
2016-05-11OE376953ND
2016-05-11OE376954ND
2016-05-11OE376955ND
2016-05-11OE376957ND
2016-05-11OE376958ND
2016-05-11OE3769560.500 ppb
2016-05-11OE376959ND
2016-08-16OE416182ND
2016-08-16OE4161840.700 ppb
2016-08-16OE4161850.900 ppb
2016-08-16OE4161860.700 ppb
2016-08-16OE4161870.600 ppb
2016-08-16OE4161831.20 ppb
2016-08-16OE4161810.500 ppb
2016-08-16OE4161880.800 ppb
2016-11-16OE4532681.30 ppb
2016-11-16OE4532610.600 ppb
2016-11-16OE4532621.10 ppb
2016-11-16OE4532630.900 ppb
2016-11-16OE4532651.10 ppb
2016-11-16OE4532661.000 ppb
2016-11-16OE4532640.800 ppb
2016-11-16OE4532670.700 ppb
2017-02-08OE4789220.800 ppb
2017-02-08OE478923ND
2017-02-08OE4789160.800 ppb
2017-02-08OE478920ND
2017-02-08OE478919ND
2017-02-08OE4789170.600 ppb
2017-02-08OE4789210.500 ppb
2017-02-08OE4789180.500 ppb
2017-05-23OE516469ND
2017-05-23OE516468ND
2017-05-23OE516462ND
2017-05-23OE516464ND
2017-05-23OE516463ND
2017-05-23OE516465ND
2017-05-23OE516467ND
2017-05-23OE516466ND
2017-08-07OE5475900.900 ppb
2017-08-07OE5475890.900 ppb
2017-08-07OE5475831.20 ppb
2017-08-07OE5475880.600 ppb
2017-08-07OE5475861.000 ppb
2017-08-07OE5475870.800 ppb
2017-08-07OE5475841.10 ppb
2017-08-07OE5475851.50 ppb
2017-11-20OE592649ND
2017-11-20OE5926480.700 ppb
2017-11-20OE592644ND
2017-11-20OE5926460.500 ppb
2017-11-20OE592647ND
2017-11-20OE592645ND
2017-11-20OE5926500.500 ppb
2017-11-20OE5926430.600 ppb
2018-02-13OE6225330.700 ppb
2018-02-13OE622534ND
2018-02-13OE6225350.500 ppb
2018-02-13OE622536ND
2018-02-13OE622537ND
2018-02-13OE6225380.500 ppb
2018-02-13OE622539ND
2018-02-13OE622540ND
2018-05-21OE660495ND
2018-05-21OE660496ND
2018-05-21OE660497ND
2018-05-21OE660498ND
2018-05-21OE660499ND
2018-05-21OE660500ND
2018-05-21OE660501ND
2018-05-21OE660502ND
2018-08-14OE6989840.900 ppb
2018-08-14OE6989850.800 ppb
2018-08-14OE6989860.800 ppb
2018-08-14OE6989870.800 ppb
2018-08-14OE698988ND
2018-08-14OE698989ND
2018-08-14OE6989900.700 ppb
2018-08-14OE6989910.600 ppb
2018-11-19OE7418811.000 ppb
2018-11-19OE7418820.700 ppb
2018-11-19OE7418830.800 ppb
2018-11-19OE7418840.800 ppb
2018-11-19OE7418851.20 ppb
2018-11-19OE7418860.800 ppb
2018-11-19OE7418871.000 ppb
2018-11-19OE7418881.000 ppb
2019-02-13OE770735ND
2019-02-13OE7707360.500 ppb
2019-02-13OE7707370.600 ppb
2019-02-13OE7707380.700 ppb
2019-02-13OE7707390.500 ppb
2019-02-13OE770740ND
2019-02-13OE770741ND
2019-02-13OE770742ND
2019-05-08OE805451ND
2019-05-08OE8054520.500 ppb
2019-05-08OE805453ND
2019-05-08OE805454ND
2019-05-08OE8054550.700 ppb
2019-05-08OE8054560.800 ppb
2019-05-08OE8054570.900 ppb
2019-05-08OE8054580.600 ppb
2019-08-14OE850327ND
2019-08-14OE8503280.700 ppb
2019-08-14OE8503290.600 ppb
2019-08-14OE850330ND
2019-08-14OE850331ND
2019-08-14OE8503320.600 ppb
2019-08-14OE850333ND
2019-08-14OE850334ND
2019-11-19OE895925ND
2019-11-19OE8959262.00 ppb
2019-11-19OE8959270.900 ppb
2019-11-19OE8959282.10 ppb
2019-11-19OE8959291.000 ppb
2019-11-19OE8959300.900 ppb
2019-11-19OE8959312.10 ppb
2019-11-19OE8959321.90 ppb