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EWG's Tap Water Database — 2019 UPDATE

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Trichloroacetic acid

City of Port Angeles

Trichloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

 

74

Samples

0

Samples exceeding legal limit (MCL)

45

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
20131.42 ppb53ND - 4.70 ppb
20143.79 ppb17171.20 ppb - 6.60 ppb
20153.36 ppb16162.10 ppb - 5.10 ppb
20160.375 ppb164ND - 2.60 ppb
20170.406 ppb165ND - 1.60 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for trichloroacetic acid was proposed in 2020 by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk.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
2012-01-0400687ND
2012-04-2615326ND
2012-07-0525589ND
2012-10-0339939ND
2013-01-0901465ND
2013-04-1114186ND
2013-08-21357191.10 ppb
2013-10-02429231.30 ppb
2013-10-02429244.70 ppb
2014-01-02002703.00 ppb
2014-01-15026292.20 ppb
2014-01-15026275.20 ppb
2014-01-15026284.10 ppb
2014-01-15026304.80 ppb
2014-04-10154014.70 ppb
2014-04-10154023.30 ppb
2014-04-10153993.50 ppb
2014-04-10154003.20 ppb
2014-07-17314383.40 ppb
2014-07-17314363.80 ppb
2014-07-17314373.60 ppb
2014-07-17314392.40 ppb
2014-10-15465564.90 ppb
2014-10-15465451.20 ppb
2014-10-15465544.50 ppb
2014-10-15465556.60 ppb
2015-01-14023432.10 ppb
2015-01-14023422.50 ppb
2015-01-14023413.20 ppb
2015-01-14023402.60 ppb
2015-04-15162655.10 ppb
2015-04-15162664.60 ppb
2015-04-15162644.30 ppb
2015-04-15162633.00 ppb
2015-07-16328112.60 ppb
2015-07-16328133.40 ppb
2015-07-16328124.40 ppb
2015-07-16328103.40 ppb
2015-10-14497433.50 ppb
2015-10-14497414.20 ppb
2015-10-14497402.70 ppb
2015-10-14497422.10 ppb
2016-01-271.30 ppb
2016-01-27ND
2016-01-27ND
2016-01-27ND
2016-05-04ND
2016-05-041.10 ppb
2016-05-042.60 ppb
2016-05-041.000 ppb
2016-07-28ND
2016-07-28ND
2016-07-28ND
2016-07-28ND
2016-10-06ND
2016-10-06ND
2016-10-06ND
2016-10-06ND
2017-02-151.20 ppb
2017-02-151.50 ppb
2017-02-15ND
2017-02-151.000 ppb
2017-05-101.20 ppb
2017-05-10ND
2017-05-101.60 ppb
2017-05-10ND
2017-08-02ND
2017-08-02ND
2017-08-02ND
2017-08-02ND
2017-10-11ND
2017-10-11ND
2017-10-11ND
2017-10-11ND