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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

San Gabriel Valley Water Company - Fontana

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

 

176

Samples

0

Samples exceeding legal limit (MCL)

103

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.81 ppb3217ND - 8.70 ppb
2015ND80ND
20162.78 ppb3210ND - 16.0 ppb
20178.22 ppb4031ND - 24.0 ppb
20187.15 ppb3221ND - 19.0 ppb
20198.66 ppb3224ND - 30.0 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
2014-01-159588-601-1230ND
2014-01-159588-602-1215ND
2014-01-159588-603-1245ND
2014-01-159588-604-10101.000 ppb
2014-01-159588-605-11503.30 ppb
2014-01-159588-606-11003.30 ppb
2014-01-159588-607-13201.70 ppb
2014-01-159588-608-1205ND
2014-04-099588-601-1000ND
2014-04-099588-602-1310ND
2014-04-099588-603-1020ND
2014-04-099588-604-0810ND
2014-04-099588-605-12202.90 ppb
2014-04-099588-606-12006.30 ppb
2014-04-099588-607-10301.90 ppb
2014-04-099588-608-12401.40 ppb
2014-07-179588-601-0750ND
2014-07-179588-602-1150ND
2014-07-179588-603-08202.70 ppb
2014-07-179588-604-1016ND
2014-07-179588-605-1030ND
2014-07-179588-606-09502.20 ppb
2014-07-179588-607-0830ND
2014-07-179588-608-1130ND
2014-10-209588-601-09404.20 ppb
2014-10-209588-602-09202.20 ppb
2014-10-209588-603-09101.50 ppb
2014-10-209588-604-08154.80 ppb
2014-10-209588-605-08408.70 ppb
2014-10-209588-606-11258.50 ppb
2014-10-209588-607-10001.20 ppb
2014-10-209588-608-0900ND
2015-01-229588-601-1145ND
2015-01-229588-602-1130ND
2015-01-229588-603-1220ND
2015-01-229588-604-0750ND
2015-01-229588-605-1110ND
2015-01-229588-606-0850ND
2015-01-229588-607-0900ND
2015-01-229588-608-1120ND
2016-01-119588-601-0730ND
2016-01-119588-602-1000ND
2016-01-119588-603-0800ND
2016-01-119588-604-0710ND
2016-01-119588-605-09302.40 ppb
2016-01-119588-606-09207.90 ppb
2016-01-119588-607-0810ND
2016-01-119588-608-0945ND
2016-06-179588-601-0820ND
2016-06-179588-602-0800ND
2016-06-179588-603-0840ND
2016-06-179588-604-0710ND
2016-06-179588-605-072016.0 ppb
2016-06-179588-606-10103.20 ppb
2016-06-179588-607-085015.0 ppb
2016-06-179588-608-0740ND
2016-07-189588-601-0830ND
2016-07-189588-602-0840ND
2016-07-189588-603-1035ND
2016-07-189588-604-0820ND
2016-07-189588-605-09005.50 ppb
2016-07-189588-606-091014.0 ppb
2016-07-189588-607-105016.0 ppb
2016-07-189588-608-08504.20 ppb
2016-10-119588-601-0800ND
2016-10-119588-602-1250ND
2016-10-119588-603-0815ND
2016-10-119588-604-1110ND
2016-10-119588-605-12204.90 ppb
2016-10-119588-606-0930ND
2016-10-119588-607-0830ND
2016-10-119588-608-1235ND
2017-02-139588-601-122017.0 ppb
2017-02-139588-602-121013.0 ppb
2017-02-139588-603-102022.0 ppb
2017-02-139588-604-074020.0 ppb
2017-02-139588-605-113023.0 ppb
2017-02-139588-606-0920ND
2017-02-139588-607-1010ND
2017-02-139588-608-11455.80 ppb
2017-04-109588-601-072524.0 ppb
2017-04-109588-602-07407.80 ppb
2017-04-109588-603-12531.40 ppb
2017-04-109588-604-082315.0 ppb
2017-04-109588-605-080017.0 ppb
2017-04-109588-606-08434.20 ppb
2017-04-109588-607-12156.50 ppb
2017-04-109588-608-07506.30 ppb
2017-07-109588-601-12203.20 ppb
2017-07-109588-602-1200ND
2017-07-109588-603-100012.0 ppb
2017-07-109588-604-075015.0 ppb
2017-07-109588-605-113011.0 ppb
2017-07-109588-606-09402.70 ppb
2017-07-109588-607-10206.70 ppb
2017-07-109588-608-11453.00 ppb
2017-08-149588-601-131015.0 ppb
2017-08-149588-602-1250ND
2017-08-149588-603-0800ND
2017-08-149588-604-11306.40 ppb
2017-08-149588-605-114517.0 ppb
2017-08-149588-606-1110ND
2017-08-149588-607-081012.0 ppb
2017-08-149588-608-1230ND
2017-10-259588-601-0810ND
2017-10-259588-602-10202.20 ppb
2017-10-259588-603-0820ND
2017-10-259588-604-08006.90 ppb
2017-10-259588-605-094512.0 ppb
2017-10-259588-606-09304.90 ppb
2017-10-259588-607-08408.80 ppb
2017-10-259588-608-10006.80 ppb
2018-01-199588-601-0740ND
2018-01-199588-602-094011.0 ppb
2018-01-199588-603-07509.90 ppb
2018-01-199588-604-07309.90 ppb
2018-01-199588-605-090013.0 ppb
2018-01-199588-606-0840ND
2018-01-199588-607-080013.0 ppb
2018-01-199588-608-09206.20 ppb
2018-04-029588-601-095514.0 ppb
2018-04-029588-602-093515.0 ppb
2018-04-029588-603-103019.0 ppb
2018-04-029588-604-07257.30 ppb
2018-04-029588-605-091316.0 ppb
2018-04-029588-606-073513.0 ppb
2018-04-029588-607-10158.80 ppb
2018-04-029588-608-092410.00 ppb
2018-07-029588-601-1030ND
2018-07-029588-602-1040ND
2018-07-029588-603-0950ND
2018-07-029588-604-07205.10 ppb
2018-07-029588-605-111012.0 ppb
2018-07-029588-606-0810ND
2018-07-029588-607-10109.70 ppb
2018-07-029588-608-1050ND
2018-10-019588-601-0715ND
2018-10-019588-602-07356.50 ppb
2018-10-019588-603-1155ND
2018-10-019588-604-08258.00 ppb
2018-10-019588-605-081013.0 ppb
2018-10-019588-606-0910ND
2018-10-019588-607-11458.40 ppb
2018-10-019588-608-0745ND
2019-01-079588-601-074012.0 ppb
2019-01-079588-602-08107.60 ppb
2019-01-079588-603-095011.0 ppb
2019-01-079588-604-08407.00 ppb
2019-01-079588-605-08309.50 ppb
2019-01-079588-606-0855ND
2019-01-079588-607-09306.60 ppb
2019-01-079588-608-08205.40 ppb
2019-04-049588-601-10404.90 ppb
2019-04-049588-602-07306.80 ppb
2019-04-049588-603-102012.0 ppb
2019-04-049588-604-070021.0 ppb
2019-04-049588-605-075028.0 ppb
2019-04-049588-606-081030.0 ppb
2019-04-049588-607-100028.0 ppb
2019-04-049588-608-074021.0 ppb
2019-07-019588-601-1050ND
2019-07-019588-602-11309.80 ppb
2019-07-019588-603-10007.80 ppb
2019-07-019588-604-071010.00 ppb
2019-07-019588-605-123012.0 ppb
2019-07-019588-606-0940ND
2019-07-019588-607-095011.0 ppb
2019-07-019588-608-1210ND
2019-10-079588-601-11102.30 ppb
2019-10-079588-602-1120ND
2019-10-079588-603-1050ND
2019-10-079588-604-07156.80 ppb
2019-10-079588-605-13101.000 ppb
2019-10-079588-606-0940ND
2019-10-079588-607-10405.70 ppb
2019-10-079588-608-1130ND