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EWG's Tap Water Database — 2019 UPDATE

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Bromoform

Northwestern W and Sd-wtln 200

NOTE: Northwestern W and Sd-wtln 200 purchases water from Oregon City which is required to test for bromoform. Sample information shown below was taken by Oregon City.

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.

 

102

Samples

0

Samples exceeding legal limit (MCL)

57

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.30 ppb54ND - 2.80 ppb
20131.13 ppb86ND - 1.80 ppb
20140.433 ppb128ND - 0.900 ppb
20150.463 ppb86ND - 0.700 ppb
20160.800 ppb85ND - 1.60 ppb
20170.554 ppb2813ND - 1.70 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

NOTE: Northwestern W and Sd-wtln 200 purchases water from Oregon City which is required to test for bromoform. Sample information shown below was taken by Oregon City.

Date Lab ID Result
2012-02-17AG15290ND
2012-02-17AG15291ND
2012-02-17AG15292ND
2012-02-17AG15293ND
2012-05-08AG206322.30 ppb
2012-05-08AG206332.20 ppb
2012-05-08AG206342.30 ppb
2012-05-08AG206352.50 ppb
2012-06-14AG233121.80 ppb
2012-07-03AG245512.50 ppb
2012-07-03AG245482.30 ppb
2012-07-03AG245492.20 ppb
2012-07-03AG245502.30 ppb
2012-10-26AG327581.20 ppb
2012-10-26AG327591.20 ppb
2012-10-26AG327601.40 ppb
2012-10-26AG327611.20 ppb
2013-01-08AG377331.000 ppb
2013-01-08AG377341.20 ppb
2013-01-08AG377351.20 ppb
2013-01-08AG377361.000 ppb
2013-04-09AG431531.10 ppb
2013-04-09AG431541.000 ppb
2013-04-09AG431551.20 ppb
2013-04-09AG431560.900 ppb
2013-06-14AG479170.500 ppb
2013-07-09AG497420.700 ppb
2013-07-09AG497430.800 ppb
2013-07-09AG497440.700 ppb
2013-07-09AG497410.700 ppb
2013-10-08AG56556ND
2013-10-08AG56557ND
2013-10-08AG56558ND
2013-10-08AG56555ND
2014-01-13AG62669ND
2014-01-13AG62670ND
2014-01-13AG62671ND
2014-01-13AG62672ND
2014-04-14AG68445ND
2014-04-14AG68443ND
2014-04-14AG68444ND
2014-04-14AG68446ND
2014-06-04AG720370.600 ppb
2014-07-10AG752030.600 ppb
2014-07-10AG752000.900 ppb
2014-07-10AG752010.800 ppb
2014-07-10AG752020.800 ppb
2014-10-10AG828120.900 ppb
2014-10-10AG828131.000 ppb
2014-10-10AG828140.800 ppb
2014-10-10AG828150.800 ppb
2015-01-12AG888720.800 ppb
2015-01-12AG888730.800 ppb
2015-01-12AG888740.800 ppb
2015-01-12AG888750.600 ppb
2015-04-08AG93994ND
2015-04-08AG93995ND
2015-04-08AG93996ND
2015-04-08AG93997ND
2015-06-25AG99784ND
2015-07-14AH01112ND
2015-07-14AH01113ND
2015-07-14AH01114ND
2015-07-14AH01115ND
2015-10-07AH07534ND
2015-10-08AH07531ND
2015-10-08AH07532ND
2015-10-08AH07533ND
2016-01-14AH13649ND
2016-01-14AH13650ND
2016-01-14AH13651ND
2016-01-14AH13652ND
2016-04-13AH19287ND
2016-04-13AH19288ND
2016-04-13AH19289ND
2016-04-13AH19290ND
2016-06-09AH23558ND
2016-07-08AH255851.10 ppb
2016-07-08AH255821.40 ppb
2016-07-08AH255831.30 ppb
2016-07-08AH255841.40 ppb
2016-10-13AH334640.700 ppb
2016-10-13AH334650.600 ppb
2016-10-13AH334660.600 ppb
2016-10-13AH33467ND
2017-01-12AH405250.500 ppb
2017-01-12AH405260.600 ppb
2017-01-12AH405270.600 ppb
2017-01-12AH40528ND
2017-04-12AH471190.900 ppb
2017-04-12AH471200.900 ppb
2017-04-12AH471210.900 ppb
2017-04-12AH471220.700 ppb
2017-06-19AH52592ND
2017-07-11AH542210.900 ppb
2017-07-11AH542220.700 ppb
2017-07-11AH542230.800 ppb
2017-07-11AH542240.800 ppb
2017-10-11AH61963ND
2017-10-11AH619640.600 ppb
2017-10-11AH619650.500 ppb
2017-10-11AH619660.600 ppb