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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

City of Soledad

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

21

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
20150.175 ppb161ND - 2.80 ppb
20160.500 ppb165ND - 2.00 ppb
20170.563 ppb166ND - 2.00 ppb
20180.313 ppb163ND - 3.00 ppb
20190.688 ppb166ND - 3.00 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
2014-02-049588-803-0958ND
2014-02-049588-801-1040ND
2014-02-049588-802-1040ND
2014-02-049588-804-1050ND
2014-05-065810-804-1000ND
2014-05-065810-803-1100ND
2014-05-065810-802-1025ND
2014-05-065810-801-0930ND
2014-09-255810-804-1146ND
2014-09-255810-803-1205ND
2014-09-255810-802-1115ND
2014-09-255810-801-1130ND
2014-11-185810-803-1158ND
2014-11-185810-802-0939ND
2014-11-185810-804-1045ND
2014-11-185810-801-1003ND
2015-02-035810-804-1030ND
2015-02-035810-803-1050ND
2015-02-035810-802-0919ND
2015-02-035810-801-0955ND
2015-05-195810-804-0949ND
2015-05-195810-803-0848ND
2015-05-195810-801-0935ND
2015-05-195810-802-0918ND
2015-08-045810-801-1042ND
2015-08-045810-804-1024ND
2015-08-045810-803-11272.80 ppb
2015-08-045810-802-1104ND
2015-11-195810-802-1028ND
2015-11-195810-801-1042ND
2015-11-195810-804-1130ND
2015-11-195810-803-1005ND
2016-02-095810-802-0945ND
2016-02-095810-801-1005ND
2016-02-095810-804-1050ND
2016-02-095810-803-0910ND
2016-05-035867-802-0954ND
2016-05-035867-801-1015ND
2016-05-035867-803-1150ND
2016-05-045867-804-1125ND
2016-08-025867-804-09382.00 ppb
2016-08-025867-802-09052.00 ppb
2016-08-025867-801-09201.000 ppb
2016-08-025867-803-10112.00 ppb
2016-11-085867-804-10181.000 ppb
2016-11-085867-802-0935ND
2016-11-085867-803-1035ND
2016-11-085867-801-0950ND
2017-01-115867-803-0825ND
2017-01-115867-804-09252.00 ppb
2017-01-115867-802-08461.000 ppb
2017-01-115867-801-0900ND
2017-05-025867-803-11481.000 ppb
2017-05-025867-801-1048ND
2017-05-025867-802-11062.00 ppb
2017-05-025867-804-10202.00 ppb
2017-07-055867-801-0940ND
2017-07-055867-802-0925ND
2017-07-055867-804-0940ND
2017-07-055867-803-1106ND
2017-10-035867-804-11181.000 ppb
2017-10-035867-801-1010ND
2017-10-035867-803-0900ND
2017-10-035867-802-0953ND
2018-01-055867-804-0935ND
2018-01-055867-801-1025ND
2018-01-055867-802-0855ND
2018-01-055867-803-0840ND
2018-04-035867-802-1110ND
2018-04-035867-803-0908ND
2018-04-035867-804-1050ND
2018-04-035867-801-0955ND
2018-07-035867-802-0852ND
2018-07-035867-804-1000ND
2018-07-035867-803-0805ND
2018-07-035867-801-0920ND
2018-10-025867-802-10001.000 ppb
2018-10-025867-804-10401.000 ppb
2018-10-025867-803-11113.00 ppb
2018-10-025867-801-1025ND
2019-01-155867-801-1157ND
2019-01-155867-803-1135ND
2019-01-155867-802-11451.000 ppb
2019-01-155867-804-12152.00 ppb
2019-04-025867-801-1118ND
2019-04-025867-803-1126ND
2019-04-025867-804-10101.000 ppb
2019-04-025867-802-1152ND
2019-07-105867-804-1005ND
2019-07-105867-803-11222.00 ppb
2019-07-105867-801-1027ND
2019-07-105867-802-1051ND
2019-10-085867-804-10203.00 ppb
2019-10-085867-803-1107ND
2019-10-085867-801-1000ND
2019-10-085867-802-10462.00 ppb