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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Valencia Water Company

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.

 

192

Samples

0

Samples exceeding legal limit (MCL)

157

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20143.56 ppb3226ND - 7.50 ppb
20151.98 ppb3218ND - 11.0 ppb
20163.84 ppb3228ND - 8.10 ppb
20176.25 ppb3227ND - 11.0 ppb
20184.98 ppb3227ND - 10.00 ppb
20198.32 ppb3231ND - 16.0 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
2014-01-139590-800-0850ND
2014-01-139590-801-10052.50 ppb
2014-01-139590-802-0916ND
2014-01-139590-803-11354.10 ppb
2014-01-139590-804-1335ND
2014-01-139590-805-1315ND
2014-01-139590-806-0945ND
2014-01-139590-807-08053.40 ppb
2014-04-149590-800-11205.30 ppb
2014-04-149590-801-09284.50 ppb
2014-04-149590-802-08103.10 ppb
2014-04-149590-803-13204.80 ppb
2014-04-149590-804-11004.90 ppb
2014-04-149590-805-13352.10 ppb
2014-04-149590-806-10153.70 ppb
2014-04-149590-807-11303.00 ppb
2014-07-149590-800-13003.50 ppb
2014-07-149590-801-11003.90 ppb
2014-07-149590-802-08153.90 ppb
2014-07-149590-803-13152.50 ppb
2014-07-149590-804-12303.70 ppb
2014-07-149590-805-13454.70 ppb
2014-07-149590-806-10003.80 ppb
2014-07-149590-807-14106.90 ppb
2014-10-139590-800-11004.20 ppb
2014-10-139590-801-14005.20 ppb
2014-10-139590-802-09007.50 ppb
2014-10-139590-803-14005.40 ppb
2014-10-139590-804-14556.10 ppb
2014-10-139590-805-14156.70 ppb
2014-10-139590-806-1300ND
2014-10-139590-807-15454.60 ppb
2015-01-129590-800-10402.90 ppb
2015-01-129590-801-1130ND
2015-01-129590-802-0840ND
2015-01-129590-803-09103.20 ppb
2015-01-129590-804-11204.90 ppb
2015-01-129590-805-09502.30 ppb
2015-01-129590-806-1100ND
2015-01-129590-807-13403.20 ppb
2015-04-139590-800-133011.0 ppb
2015-04-139590-801-14502.10 ppb
2015-04-139590-802-1400ND
2015-04-139590-803-10303.40 ppb
2015-04-139590-804-13106.70 ppb
2015-04-139590-805-09404.00 ppb
2015-04-139590-806-1345ND
2015-04-139590-807-1420ND
2015-07-139590-800-13112.30 ppb
2015-07-139590-801-13452.10 ppb
2015-07-139590-802-1245ND
2015-07-139590-803-1331ND
2015-07-139590-804-13022.40 ppb
2015-07-139590-805-1350ND
2015-07-139590-806-1330ND
2015-07-139590-807-1235ND
2015-10-129590-800-1135ND
2015-10-129590-801-09302.90 ppb
2015-10-129590-802-08383.00 ppb
2015-10-129590-803-1315ND
2015-10-129590-804-09362.00 ppb
2015-10-129590-805-1307ND
2015-10-129590-806-10062.40 ppb
2015-10-129590-807-07502.70 ppb
2016-01-119590-800-09005.70 ppb
2016-01-119590-801-10104.40 ppb
2016-01-119590-802-10505.20 ppb
2016-01-119590-803-13104.20 ppb
2016-01-119590-804-14007.00 ppb
2016-01-119590-805-1330ND
2016-01-119590-806-09402.80 ppb
2016-01-119590-807-11102.30 ppb
2016-04-189590-800-09284.70 ppb
2016-04-189590-801-10408.10 ppb
2016-04-189590-802-11004.70 ppb
2016-04-189590-803-12555.00 ppb
2016-04-189590-804-13454.40 ppb
2016-04-189590-805-13203.10 ppb
2016-04-189590-806-10104.40 ppb
2016-04-189590-807-11203.00 ppb
2016-07-189590-800-10122.90 ppb
2016-07-189590-801-08584.10 ppb
2016-07-189590-802-08304.50 ppb
2016-07-189590-803-10423.90 ppb
2016-07-189590-804-09192.60 ppb
2016-07-189590-805-11202.70 ppb
2016-07-189590-806-09243.70 ppb
2016-07-189590-807-08103.80 ppb
2016-10-179590-800-0910ND
2016-10-179590-801-10007.40 ppb
2016-10-179590-802-08355.10 ppb
2016-10-179590-803-1130ND
2016-10-179590-804-1100ND
2016-10-179590-805-11454.60 ppb
2016-10-179590-806-09352.80 ppb
2016-10-179590-807-10255.70 ppb
2017-01-179590-800-1015ND
2017-01-179590-801-10459.10 ppb
2017-01-179590-802-11009.40 ppb
2017-01-179590-803-09304.30 ppb
2017-01-179590-804-0900ND
2017-01-179590-805-09454.50 ppb
2017-01-179590-806-1030ND
2017-01-179590-807-08354.80 ppb
2017-04-179590-800-10007.60 ppb
2017-04-179590-801-10407.60 ppb
2017-04-179590-802-10557.80 ppb
2017-04-179590-803-09159.20 ppb
2017-04-179590-804-11308.80 ppb
2017-04-179590-805-09357.90 ppb
2017-04-179590-806-10208.70 ppb
2017-04-179590-807-11108.60 ppb
2017-07-189590-800-09056.10 ppb
2017-07-189590-801-09356.60 ppb
2017-07-189590-802-09554.50 ppb
2017-07-189590-803-104511.0 ppb
2017-07-189590-804-10208.20 ppb
2017-07-189590-805-110010.00 ppb
2017-07-189590-806-09205.20 ppb
2017-07-189590-807-08354.10 ppb
2017-10-169590-800-1005ND
2017-10-169590-801-103011.0 ppb
2017-10-169590-802-09506.40 ppb
2017-10-169590-803-1125ND
2017-10-169590-804-11006.70 ppb
2017-10-169590-805-11309.10 ppb
2017-10-169590-806-10157.10 ppb
2017-10-169590-807-10455.60 ppb
2018-01-169590-800-0903ND
2018-01-169590-801-09326.40 ppb
2018-01-169590-802-09456.80 ppb
2018-01-169590-803-08266.00 ppb
2018-01-169590-804-10217.00 ppb
2018-01-169590-805-0840ND
2018-01-169590-806-09173.20 ppb
2018-01-169590-807-10003.40 ppb
2018-04-169590-800-0840ND
2018-04-169590-801-090510.00 ppb
2018-04-169590-802-09257.50 ppb
2018-04-169590-803-08107.70 ppb
2018-04-169590-804-1005ND
2018-04-169590-805-08205.20 ppb
2018-04-169590-806-08554.30 ppb
2018-04-169590-807-09454.90 ppb
2018-07-169590-800-0845ND
2018-07-169590-801-09257.50 ppb
2018-07-169590-802-09455.70 ppb
2018-07-169590-803-08106.50 ppb
2018-07-169590-804-10203.70 ppb
2018-07-169590-805-08207.80 ppb
2018-07-169590-806-09053.40 ppb
2018-07-169590-807-10002.00 ppb
2018-10-159590-800-08353.40 ppb
2018-10-159590-801-08007.90 ppb
2018-10-159590-802-08506.30 ppb
2018-10-159590-803-09458.10 ppb
2018-10-159590-804-11105.90 ppb
2018-10-159590-805-09209.00 ppb
2018-10-159590-806-08155.90 ppb
2018-10-159590-807-11353.70 ppb
2019-01-149590-800-09108.10 ppb
2019-01-149590-801-10009.60 ppb
2019-01-149590-802-10154.40 ppb
2019-01-149590-803-08359.00 ppb
2019-01-149590-804-11006.80 ppb
2019-01-149590-805-08454.50 ppb
2019-01-149590-806-0935ND
2019-01-149590-807-10302.90 ppb
2019-04-159590-800-093512.0 ppb
2019-04-159590-801-102011.0 ppb
2019-04-159590-802-104011.0 ppb
2019-04-159590-803-084015.0 ppb
2019-04-159590-804-11259.80 ppb
2019-04-159590-805-090016.0 ppb
2019-04-159590-806-100012.0 ppb
2019-04-159590-807-110012.0 ppb
2019-07-159590-800-09207.90 ppb
2019-07-159590-801-10307.50 ppb
2019-07-159590-802-10508.20 ppb
2019-07-159590-803-08358.80 ppb
2019-07-159590-804-12006.40 ppb
2019-07-159590-805-090010.00 ppb
2019-07-159590-806-09557.90 ppb
2019-07-159590-807-11257.80 ppb
2019-10-149590-800-11257.90 ppb
2019-10-149590-801-08158.40 ppb
2019-10-149590-802-08358.30 ppb
2019-10-149590-803-10409.60 ppb
2019-10-149590-804-09353.60 ppb
2019-10-149590-805-11007.00 ppb
2019-10-149590-806-121010.00 ppb
2019-10-149590-807-09052.90 ppb