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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Aqua Pa Hatboro

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.

MORE ABOUT THIS CONTAMINANT

 

97

Samples

0

Samples exceeding legal limit (MCL)

63

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20146.52 ppb1614ND - 15.9 ppb
20152.74 ppb1611ND - 13.4 ppb
20162.83 ppb169ND - 12.7 ppb
201710.0 ppb1613ND - 42.7 ppb
20185.14 ppb177ND - 25.5 ppb
20193.92 ppb169ND - 18.0 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
2014-01-08AE200073.60 ppb
2014-01-08AE1952310.1 ppb
2014-01-08AE20006ND
2014-01-17AE2143513.2 ppb
2014-04-09AE2787315.9 ppb
2014-04-09AE288703.50 ppb
2014-04-09AE278745.30 ppb
2014-04-09AE2886911.1 ppb
2014-07-09AE384498.00 ppb
2014-07-09AE384456.60 ppb
2014-07-09AE384447.40 ppb
2014-07-09AE394485.50 ppb
2014-10-08AE51734ND
2014-10-08AE517357.10 ppb
2014-10-08AE508664.60 ppb
2014-10-08AE508652.40 ppb
2015-01-07122862292.50 ppb
2015-01-0712286227ND
2015-01-07122862235.80 ppb
2015-01-0712286225ND
2015-04-0812632213ND
2015-04-0812632211ND
2015-04-08126322075.10 ppb
2015-04-08126322091.000 ppb
2015-07-08130117646.90 ppb
2015-07-08130117661.30 ppb
2015-07-08130117691.20 ppb
2015-07-081301176213.4 ppb
2015-10-0713388314ND
2015-10-07133883121.10 ppb
2015-10-07133883163.40 ppb
2015-10-07133883102.20 ppb
2016-01-0613751737ND
2016-01-0613751741ND
2016-01-0613751739ND
2016-01-0613751743ND
2016-04-0614101929ND
2016-04-06141019251.20 ppb
2016-04-06141019311.10 ppb
2016-04-0614101927ND
2016-07-06145689881.000 ppb
2016-07-0614568985ND
2016-07-06145689832.60 ppb
2016-07-06145689818.10 ppb
2016-10-121507470012.7 ppb
2016-10-12150747026.00 ppb
2016-10-12153546734.20 ppb
2016-10-12150746988.40 ppb
2017-01-111551616411.3 ppb
2017-01-11155161528.60 ppb
2017-01-11155161884.50 ppb
2017-01-11155161764.70 ppb
2017-04-1215936135ND
2017-04-121593612314.4 ppb
2017-04-12159361591.40 ppb
2017-04-1215936147ND
2017-08-10165647932.80 ppb
2017-08-1016564799ND
2017-08-101656478742.7 ppb
2017-08-101656478119.7 ppb
2017-10-11168793588.10 ppb
2017-10-11168793467.50 ppb
2017-10-11168793345.60 ppb
2017-10-111687937028.8 ppb
2018-01-03AF72704ND
2018-01-03AF72703ND
2018-01-03AF727021.40 ppb
2018-01-03AF727011.20 ppb
2018-04-04AF80402ND
2018-04-04AF8040016.9 ppb
2018-04-04AF80403ND
2018-04-04AF8040124.1 ppb
2018-04-25AF8224125.5 ppb
2018-07-31AF91164ND
2018-07-31AF91166ND
2018-07-31AF9116516.3 ppb
2018-07-31AF91167ND
2018-10-03AF97189ND
2018-10-03AF97188ND
2018-10-03AF971862.00 ppb
2018-10-03AF97187ND
2019-01-02AG05087ND
2019-01-02AG05085ND
2019-01-02AG0508413.8 ppb
2019-01-02AG05086ND
2019-04-03AG13098ND
2019-04-03AG130955.00 ppb
2019-04-03AG13096ND
2019-04-03AG13097ND
2019-07-03AG225062.30 ppb
2019-07-03AG225072.50 ppb
2019-07-03AG2251518.0 ppb
2019-07-03AG225083.10 ppb
2019-10-02AG34367ND
2019-10-02AG3436611.6 ppb
2019-10-02AG343681.000 ppb
2019-10-02AG343655.40 ppb