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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

US Army South Fort Hood

Haloacetic acids are formed when disinfectants such as chlorine are added to tap water. The group of five haloacetic acids regulated by federal standards includes monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monobromoacetic acid and dibromoacetic acid. Read More.

Haloacetic acids are harmful during pregnancy and may increase the risk of cancer. Haloacetic acids are genotoxic, which means that they induce mutations and DNA damage. Multiple studies by the National Toxicology Program have demonstrated the cancer-causing properties of individual haloacetic acids in laboratory animals. The Department of Health and Human Services is currently considering listing di- or tri-haloacetic acids for possible inclusion in its comprehensive Report on Carcinogens.

Click here to read more about disinfection byproducts.

 

167

Samples

0

Samples exceeding legal limit (MCL)

145

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20146.38 ppb3225ND - 13.9 ppb
20157.57 ppb3121ND - 33.3 ppb
201620.9 ppb3230ND - 43.6 ppb
201712.2 ppb3229ND - 25.6 ppb
201810.7 ppb24241.20 ppb - 15.9 ppb
201919.2 ppb161610.6 ppb - 28.6 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 the group of five haloacetic acids, or HAA5, was defined in a peer-reviewed scientific study by EWG and represents a one-in-a-million lifetime cancer risk level. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL) 60 ppb

The legal limit for the group of five haloacetic acids (HAA5), established in 1998, was based on the need for residual disinfectant levels in water served to customers and the cost of treatment. This limit does not fully protect against the risk of cancer and harm to the developing fetus due to exposure to haloacetic acids.

ppb = parts per billion

All test results

Date Lab ID Result
2014-02-12AC425985.00 ppb
2014-02-12AC42600ND
2014-02-12AC4258311.0 ppb
2014-02-12AC425959.00 ppb
2014-02-12AC425998.90 ppb
2014-02-12AC425969.30 ppb
2014-02-12AC426015.60 ppb
2014-02-12AC426025.80 ppb
2014-04-15AC505491.90 ppb
2014-04-15AC50540ND
2014-04-15AC5055011.6 ppb
2014-04-15AC5054411.0 ppb
2014-04-15AC505457.30 ppb
2014-04-15AC505468.00 ppb
2014-04-15AC505476.20 ppb
2014-04-15AC50548ND
2014-07-17AC601352.30 ppb
2014-07-17AC601147.60 ppb
2014-07-17AC6013311.9 ppb
2014-07-17AC6013713.9 ppb
2014-07-17AC6015411.5 ppb
2014-07-17AC6011512.9 ppb
2014-07-17AC6011712.2 ppb
2014-07-17AC60134ND
2014-10-21AC70183ND
2014-10-21AC70182ND
2014-10-21AC701798.70 ppb
2014-10-21AC701759.20 ppb
2014-10-21AC701913.10 ppb
2014-10-21AC701762.50 ppb
2014-10-21AC701787.90 ppb
2014-10-21AC70181ND
2015-02-12AC80392ND
2015-02-12AC80391ND
2015-02-12AC8039010.5 ppb
2015-02-12AC804088.70 ppb
2015-02-12AC804108.80 ppb
2015-02-12AC80412ND
2015-02-12AC803899.40 ppb
2015-02-12AC80407ND
2015-04-21AC89012ND
2015-04-21AC89011ND
2015-04-21AC8901910.2 ppb
2015-04-21AC890108.60 ppb
2015-04-21AC890074.80 ppb
2015-04-21AC89017ND
2015-04-21AC890098.30 ppb
2015-04-21AC89016ND
2015-08-19AD046772.90 ppb
2015-08-19AD046794.80 ppb
2015-08-19AD0467433.3 ppb
2015-08-19AD0467812.7 ppb
2015-08-19AD0467127.2 ppb
2015-08-19AD046767.90 ppb
2015-08-19AD046721.20 ppb
2015-10-07AD097871.000 ppb
2015-10-07AD09788ND
2015-10-07AD0978918.7 ppb
2015-10-07AD0979014.8 ppb
2015-10-07AD0977929.4 ppb
2015-10-07AD097918.20 ppb
2015-10-07AD097923.20 ppb
2015-10-07AD09793ND
2016-01-26AD2005523.2 ppb
2016-01-26AD2006623.2 ppb
2016-01-26AD2005012.1 ppb
2016-01-26AD2006425.7 ppb
2016-01-26AD2006028.4 ppb
2016-01-26AD2006216.4 ppb
2016-01-26AD2006326.1 ppb
2016-01-26AD2005215.8 ppb
2016-04-13AD3298319.9 ppb
2016-04-13AD33007ND
2016-04-13AD3298918.1 ppb
2016-04-13AD3298520.7 ppb
2016-04-13AD3297920.9 ppb
2016-04-13AD3298112.6 ppb
2016-04-13AD3298023.4 ppb
2016-04-13AD3298225.5 ppb
2016-07-19AD447213.30 ppb
2016-07-19AD447225.00 ppb
2016-07-19AD4471439.2 ppb
2016-07-19AD4472031.3 ppb
2016-07-19AD4471824.9 ppb
2016-07-19AD447117.40 ppb
2016-07-19AD4471942.2 ppb
2016-07-19AD4471726.0 ppb
2016-10-25AD54592ND
2016-10-25AD5458511.1 ppb
2016-10-25AD545943.40 ppb
2016-10-25AD5459313.4 ppb
2016-10-25AD5458933.4 ppb
2016-10-25AD5459039.3 ppb
2016-10-25AD5458443.6 ppb
2016-10-25AD5459532.4 ppb
2017-02-16AD71048ND
2017-02-16AD7104312.7 ppb
2017-02-16AD7104710.6 ppb
2017-02-16AD7104121.2 ppb
2017-02-16AD7104521.0 ppb
2017-02-16AD710495.20 ppb
2017-02-16AD7104421.8 ppb
2017-02-16AD7104625.6 ppb
2017-05-03AD824348.60 ppb
2017-05-03AD8243012.9 ppb
2017-05-03AD8242122.4 ppb
2017-05-03AD8242810.00 ppb
2017-05-03AD8243213.1 ppb
2017-05-03AD824274.30 ppb
2017-05-03AD8242221.3 ppb
2017-05-03AD8242522.0 ppb
2017-07-25AD905531.10 ppb
2017-07-25AD90558ND
2017-07-25AD9056015.5 ppb
2017-07-25AD9055418.4 ppb
2017-07-25AD905576.10 ppb
2017-07-25AD905593.80 ppb
2017-07-25AD9056116.1 ppb
2017-07-25AD9055518.5 ppb
2017-10-23AE0157219.8 ppb
2017-10-23AE015745.00 ppb
2017-10-23AE015775.00 ppb
2017-10-23AE0157014.0 ppb
2017-10-23AE015752.70 ppb
2017-10-23AE01578ND
2017-10-23AE0156912.4 ppb
2017-10-23AE0157118.0 ppb
2018-01-10AE0857910.5 ppb
2018-01-10AE085786.70 ppb
2018-01-10AE085756.00 ppb
2018-01-10AE0858010.4 ppb
2018-01-10AE085847.90 ppb
2018-01-10AE085811.20 ppb
2018-01-10AE085765.60 ppb
2018-01-10AE0858512.0 ppb
2018-04-04AE2120912.2 ppb
2018-04-04AE2120715.9 ppb
2018-04-04AE212019.80 ppb
2018-04-04AE2120012.2 ppb
2018-04-04AE2120813.6 ppb
2018-04-04AE2121210.9 ppb
2018-04-04AE2121112.8 ppb
2018-04-04AE2120213.4 ppb
2018-08-30AE3889615.0 ppb
2018-08-30AE3889413.3 ppb
2018-08-30AE388988.40 ppb
2018-08-30AE3889013.7 ppb
2018-10-24AE444549.50 ppb
2018-10-24AE4444613.5 ppb
2018-10-24AE444496.40 ppb
2018-10-24AE4445315.8 ppb
2019-01-31AE5239211.5 ppb
2019-01-31AE5239618.2 ppb
2019-01-31AE5239913.1 ppb
2019-01-31AE5239417.0 ppb
2019-05-08AE6537017.3 ppb
2019-05-08AE6537315.0 ppb
2019-05-08AE6537412.1 ppb
2019-05-08AE6536918.6 ppb
2019-07-24AE7570610.6 ppb
2019-07-24AE7571024.6 ppb
2019-07-24AE7570528.6 ppb
2019-07-24AE7570922.0 ppb
2019-10-22AE8718426.6 ppb
2019-10-22AE8718723.5 ppb
2019-10-22AE8718819.5 ppb
2019-10-22AE8718628.2 ppb