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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

City of Santa Ana

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

 

212

Samples

0

Samples exceeding legal limit (MCL)

142

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20149.56 ppb3225ND - 22.6 ppb
20157.09 ppb3220ND - 19.3 ppb
20163.74 ppb3217ND - 15.7 ppb
20176.13 ppb3228ND - 15.8 ppb
20182.90 ppb3622ND - 7.10 ppb
20192.33 ppb4830ND - 14.9 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
2014-03-123761-801-08468.20 ppb
2014-03-123761-802-094211.8 ppb
2014-03-123761-803-10098.30 ppb
2014-03-123761-804-10229.20 ppb
2014-03-123761-805-104212.5 ppb
2014-03-123761-806-1055ND
2014-03-123761-807-1106ND
2014-03-123761-808-1127ND
2014-06-123761-801-083122.6 ppb
2014-06-123761-802-094619.7 ppb
2014-06-123761-803-102118.2 ppb
2014-06-123761-804-103119.9 ppb
2014-06-123761-805-105617.1 ppb
2014-06-123761-806-111618.0 ppb
2014-06-123761-807-113118.1 ppb
2014-06-123761-808-1225ND
2014-08-123761-801-08267.00 ppb
2014-08-123761-802-085618.5 ppb
2014-08-123761-803-093616.3 ppb
2014-08-123761-804-094621.5 ppb
2014-08-123761-805-121617.4 ppb
2014-08-123761-806-12262.80 ppb
2014-08-123761-807-12412.50 ppb
2014-08-123761-808-1301ND
2014-12-153761-801-085611.0 ppb
2014-12-153761-802-092610.7 ppb
2014-12-153761-803-0951ND
2014-12-153761-804-10012.10 ppb
2014-12-153761-805-10268.90 ppb
2014-12-153761-806-10411.50 ppb
2014-12-153761-807-10512.10 ppb
2014-12-153761-808-1126ND
2015-03-123761-801-091612.7 ppb
2015-03-123761-802-09519.30 ppb
2015-03-123761-803-10317.50 ppb
2015-03-123761-804-10419.50 ppb
2015-03-123761-805-11019.50 ppb
2015-03-123761-806-1116ND
2015-03-123761-807-1126ND
2015-03-123761-808-11462.40 ppb
2015-06-123761-801-082013.9 ppb
2015-06-123761-802-090012.0 ppb
2015-06-123761-803-092011.9 ppb
2015-06-123761-804-101512.1 ppb
2015-06-123761-805-105511.1 ppb
2015-06-123761-806-1120ND
2015-06-123761-807-1145ND
2015-06-123761-808-12154.80 ppb
2015-08-123761-801-090013.2 ppb
2015-08-123761-802-093017.0 ppb
2015-08-123761-803-105016.9 ppb
2015-08-123761-804-105519.3 ppb
2015-08-123761-805-112012.1 ppb
2015-08-123761-806-113512.0 ppb
2015-08-123761-807-114511.8 ppb
2015-08-123761-808-1220ND
2015-12-083761-801-0856ND
2015-12-083761-802-09218.00 ppb
2015-12-083761-803-0931ND
2015-12-083761-804-0941ND
2015-12-083761-805-1001ND
2015-12-083761-806-1016ND
2015-12-083761-807-1031ND
2015-12-083761-808-1056ND
2016-03-083761-801-10452.70 ppb
2016-03-083761-802-08202.50 ppb
2016-03-083761-803-0955ND
2016-03-083761-804-0940ND
2016-03-083761-805-1120ND
2016-03-083761-806-1135ND
2016-03-083761-807-11051.60 ppb
2016-03-083761-808-1010ND
2016-06-153761-801-08303.60 ppb
2016-06-153761-802-090011.5 ppb
2016-06-153761-803-093014.5 ppb
2016-06-153761-804-094013.9 ppb
2016-06-153761-805-10006.40 ppb
2016-06-153761-806-1010ND
2016-06-153761-807-1030ND
2016-06-153761-808-1100ND
2016-08-113761-801-11453.50 ppb
2016-08-113761-802-105012.0 ppb
2016-08-113761-803-091014.5 ppb
2016-08-113761-804-103015.7 ppb
2016-08-113761-805-11103.00 ppb
2016-08-113761-806-11202.70 ppb
2016-08-113761-807-11302.80 ppb
2016-08-113761-808-09302.50 ppb
2016-12-133761-801-1035ND
2016-12-133761-802-0850ND
2016-12-133761-803-0955ND
2016-12-133761-804-09256.20 ppb
2016-12-133761-805-1100ND
2016-12-133761-806-1130ND
2016-12-133761-807-1050ND
2016-12-133761-808-1010ND
2017-03-143761-801-095011.4 ppb
2017-03-143761-802-102015.8 ppb
2017-03-143761-803-10401.30 ppb
2017-03-143761-804-10503.60 ppb
2017-03-143761-805-111512.6 ppb
2017-03-143761-806-112514.1 ppb
2017-03-143761-807-113515.1 ppb
2017-03-143761-808-1155ND
2017-06-143761-801-07504.00 ppb
2017-06-143761-802-083015.1 ppb
2017-06-143761-803-095010.2 ppb
2017-06-143761-804-100010.7 ppb
2017-06-143761-805-10252.80 ppb
2017-06-143761-806-10452.90 ppb
2017-06-143761-807-10554.00 ppb
2017-06-143761-808-11151.000 ppb
2017-08-153761-801-08258.40 ppb
2017-08-153761-802-08458.30 ppb
2017-08-153761-803-09359.40 ppb
2017-08-153761-804-095010.1 ppb
2017-08-153761-805-10202.00 ppb
2017-08-153761-806-10302.00 ppb
2017-08-153761-807-10402.00 ppb
2017-08-153761-808-1100ND
2017-12-123761-801-0920ND
2017-12-123761-802-10004.60 ppb
2017-12-123761-803-10184.80 ppb
2017-12-123761-804-10304.90 ppb
2017-12-123761-805-10565.30 ppb
2017-12-123761-806-11144.30 ppb
2017-12-123761-807-11255.40 ppb
2017-12-123761-808-1153ND
2018-03-133761-801-1110ND
2018-03-133761-802-09007.10 ppb
2018-03-133761-803-1240ND
2018-03-133761-804-1212ND
2018-03-133761-805-11206.40 ppb
2018-03-133761-806-11351.40 ppb
2018-03-133761-807-11403.20 ppb
2018-03-133761-808-1225ND
2018-06-123761-801-0850ND
2018-06-123761-802-09356.80 ppb
2018-06-123761-803-10006.80 ppb
2018-06-123761-804-10126.90 ppb
2018-06-123761-805-10355.20 ppb
2018-06-123761-806-10525.00 ppb
2018-06-123761-807-11054.90 ppb
2018-06-123761-808-1133ND
2018-08-143761-801-0845ND
2018-08-143761-802-09205.60 ppb
2018-08-143761-803-09454.60 ppb
2018-08-143761-804-09552.80 ppb
2018-08-143761-805-10154.60 ppb
2018-08-143761-806-10284.80 ppb
2018-08-143761-807-10394.80 ppb
2018-08-143761-808-1104ND
2018-11-133761-801-04457.10 ppb
2018-11-133761-802-05054.90 ppb
2018-11-133761-803-0525ND
2018-11-133761-804-0540ND
2018-11-133761-805-06004.80 ppb
2018-11-133761-806-06151.50 ppb
2018-11-133761-807-06252.20 ppb
2018-11-133761-808-0645ND
2018-11-133761-809-07103.10 ppb
2018-11-133761-810-0730ND
2018-11-133761-811-0750ND
2018-11-133761-812-0805ND
2019-02-123761-801-0825ND
2019-02-123761-802-11104.50 ppb
2019-02-123761-803-1400ND
2019-02-123761-804-1422ND
2019-02-123761-805-11306.70 ppb
2019-02-123761-806-1240ND
2019-02-123761-807-12252.80 ppb
2019-02-123761-808-1413ND
2019-02-123761-809-12522.30 ppb
2019-02-123761-810-1330ND
2019-02-123761-811-1347ND
2019-02-123761-812-1338ND
2019-05-073761-801-0825ND
2019-05-073761-802-08574.30 ppb
2019-05-073761-803-10423.40 ppb
2019-05-073761-804-10183.30 ppb
2019-05-073761-805-09243.90 ppb
2019-05-073761-806-09534.00 ppb
2019-05-073761-807-09384.20 ppb
2019-05-073761-808-1031ND
2019-05-073761-809-11554.70 ppb
2019-05-073761-810-11033.50 ppb
2019-05-073761-811-11301.20 ppb
2019-05-073761-812-11203.00 ppb
2019-08-133761-801-12101.10 ppb
2019-08-133761-802-09483.70 ppb
2019-08-133761-803-07242.40 ppb
2019-08-133761-804-07411.70 ppb
2019-08-133761-805-10392.10 ppb
2019-08-133761-806-10202.10 ppb
2019-08-133761-807-10572.20 ppb
2019-08-133761-808-08041.10 ppb
2019-08-133761-809-11172.40 ppb
2019-08-133761-810-01182.00 ppb
2019-08-133761-811-1251ND
2019-08-133761-812-1236ND
2019-11-123761-801-0646ND
2019-11-123761-802-07568.30 ppb
2019-11-123761-803-0532ND
2019-11-123761-804-055014.9 ppb
2019-11-123761-805-11314.30 ppb
2019-11-123761-806-1141ND
2019-11-123761-807-1123ND
2019-11-123761-808-0542ND
2019-11-123761-809-07061.000 ppb
2019-11-123761-810-06257.70 ppb
2019-11-123761-811-0613ND
2019-11-123761-812-06042.90 ppb