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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

City of San Juan Capistrano

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

 

193

Samples

0

Samples exceeding legal limit (MCL)

139

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20148.05 ppb3224ND - 22.0 ppb
20154.46 ppb3220ND - 12.0 ppb
20162.15 ppb3219ND - 4.90 ppb
20173.52 ppb3221ND - 9.00 ppb
20183.66 ppb3223ND - 8.60 ppb
20198.27 ppb3332ND - 21.0 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
2014-02-109590-801-072711.0 ppb
2014-02-109590-802-1231ND
2014-02-109590-803-074812.0 ppb
2014-02-109590-804-08584.90 ppb
2014-02-109590-805-1309ND
2014-02-109590-806-1150ND
2014-02-109590-807-1120ND
2014-02-109590-808-1107ND
2014-05-129590-801-080821.0 ppb
2014-05-129590-802-083322.0 ppb
2014-05-129590-803-08196.00 ppb
2014-05-129590-804-093919.0 ppb
2014-05-129590-805-10322.60 ppb
2014-05-129590-806-1159ND
2014-05-129590-807-1101ND
2014-05-129590-808-111416.0 ppb
2014-08-119590-801-073811.0 ppb
2014-08-119590-802-083312.0 ppb
2014-08-119590-803-081512.0 ppb
2014-08-119590-804-084813.0 ppb
2014-08-119590-805-11215.00 ppb
2014-08-119590-806-102914.0 ppb
2014-08-119590-807-095916.0 ppb
2014-08-119590-808-094715.0 ppb
2014-11-109590-801-06457.60 ppb
2014-11-109590-802-15127.70 ppb
2014-11-109590-803-14507.30 ppb
2014-11-109590-804-08158.30 ppb
2014-11-109590-805-1340ND
2014-11-109590-806-14105.60 ppb
2014-11-109590-807-10003.10 ppb
2014-11-109590-808-14305.50 ppb
2015-02-099590-801-14078.40 ppb
2015-02-099590-802-10009.50 ppb
2015-02-099590-803-14309.10 ppb
2015-02-099590-804-10208.30 ppb
2015-02-099590-805-11462.70 ppb
2015-02-099590-806-1120ND
2015-02-099590-807-1100ND
2015-02-099590-808-1045ND
2015-05-119590-801-090111.0 ppb
2015-05-119590-802-150011.0 ppb
2015-05-119590-803-144012.0 ppb
2015-05-119590-804-09379.60 ppb
2015-05-119590-805-13526.40 ppb
2015-05-119590-806-12273.30 ppb
2015-05-119590-807-1140ND
2015-05-119590-808-11232.90 ppb
2015-08-109590-801-08278.30 ppb
2015-08-109590-802-083912.0 ppb
2015-08-109590-803-08506.90 ppb
2015-08-109590-804-09184.80 ppb
2015-08-109590-805-12083.50 ppb
2015-08-109590-806-10573.30 ppb
2015-08-109590-807-10256.60 ppb
2015-08-109590-808-10153.10 ppb
2015-11-119590-801-0818ND
2015-11-119590-802-0750ND
2015-11-119590-803-0720ND
2015-11-119590-804-0844ND
2015-11-119590-805-1113ND
2015-11-119590-806-1045ND
2015-11-119590-807-1028ND
2015-11-119590-808-1008ND
2016-02-039590-801-11502.90 ppb
2016-02-039590-802-08063.30 ppb
2016-02-039590-803-07523.00 ppb
2016-02-039590-804-08584.10 ppb
2016-02-039590-805-1131ND
2016-02-039590-806-1051ND
2016-02-039590-807-1017ND
2016-02-039590-808-10063.20 ppb
2016-05-109590-801-07474.60 ppb
2016-05-109590-802-07594.90 ppb
2016-05-109590-803-08094.80 ppb
2016-05-109590-804-08304.50 ppb
2016-05-109590-805-1100ND
2016-05-109590-806-1010ND
2016-05-109590-807-0932ND
2016-05-109590-808-0920ND
2016-08-099590-801-07032.80 ppb
2016-08-099590-802-07194.20 ppb
2016-08-099590-803-07302.90 ppb
2016-08-099590-804-07553.00 ppb
2016-08-099590-805-1002ND
2016-08-099590-806-0912ND
2016-08-099590-807-0843ND
2016-08-099590-808-1019ND
2016-11-169590-801-07533.10 ppb
2016-11-169590-802-08153.10 ppb
2016-11-169590-803-08363.10 ppb
2016-11-169590-804-0903ND
2016-11-169590-805-1058ND
2016-11-169590-806-10203.90 ppb
2016-11-169590-807-09513.60 ppb
2016-11-169590-808-09263.90 ppb
2017-02-189590-801-09259.00 ppb
2017-02-189590-802-07408.40 ppb
2017-02-189590-803-08029.00 ppb
2017-02-189590-804-0822ND
2017-02-189590-805-10304.90 ppb
2017-02-189590-806-10092.50 ppb
2017-02-189590-807-0945ND
2017-02-189590-808-09033.90 ppb
2017-05-099590-801-08316.80 ppb
2017-05-099590-802-08506.60 ppb
2017-05-099590-803-09066.00 ppb
2017-05-099590-804-09339.00 ppb
2017-05-099590-805-12343.20 ppb
2017-05-099590-806-11326.20 ppb
2017-05-099590-807-10472.30 ppb
2017-05-099590-808-1032ND
2017-08-149590-801-07474.20 ppb
2017-08-149590-802-08124.30 ppb
2017-08-149590-803-08363.10 ppb
2017-08-149590-804-0931ND
2017-08-149590-805-1104ND
2017-08-149590-806-0845ND
2017-08-149590-807-0810ND
2017-08-149590-808-1054ND
2017-11-149590-801-07435.70 ppb
2017-11-149590-802-08096.30 ppb
2017-11-149590-803-08306.10 ppb
2017-11-149590-804-09132.70 ppb
2017-11-149590-805-12502.30 ppb
2017-11-149590-806-1127ND
2017-11-149590-807-1056ND
2017-11-149590-808-1030ND
2018-02-149590-801-07376.70 ppb
2018-02-149590-802-08156.70 ppb
2018-02-149590-803-08376.90 ppb
2018-02-149590-804-0900ND
2018-02-149590-805-10472.40 ppb
2018-02-149590-806-10186.20 ppb
2018-02-149590-807-09494.30 ppb
2018-02-149590-808-09297.00 ppb
2018-05-159590-801-08252.20 ppb
2018-05-159590-802-08472.50 ppb
2018-05-159590-803-09102.40 ppb
2018-05-159590-804-09503.80 ppb
2018-05-159590-805-1319ND
2018-05-159590-806-11533.70 ppb
2018-05-159590-807-11243.60 ppb
2018-05-159590-808-10583.80 ppb
2018-08-149590-801-08036.40 ppb
2018-08-149590-802-08306.60 ppb
2018-08-149590-803-08486.40 ppb
2018-08-149590-804-0930ND
2018-08-149590-805-1254ND
2018-08-149590-806-1127ND
2018-08-149590-807-1058ND
2018-08-149590-808-1038ND
2018-11-139590-801-09125.10 ppb
2018-11-139590-802-09398.30 ppb
2018-11-139590-803-10028.60 ppb
2018-11-139590-804-10215.30 ppb
2018-11-139590-805-1200ND
2018-11-139590-806-11303.70 ppb
2018-11-139590-807-1107ND
2018-11-139590-808-10434.40 ppb
2019-02-125867-801-1415ND
2019-02-125867-805-07552.00 ppb
2019-02-125867-806-09301.000 ppb
2019-02-125867-808-10153.00 ppb
2019-02-205867-801-11156.00 ppb
2019-02-205867-802-11006.00 ppb
2019-02-205867-803-10406.00 ppb
2019-02-205867-804-08542.00 ppb
2019-02-205867-807-10551.000 ppb
2019-05-145867-805-07354.00 ppb
2019-05-145867-806-08158.00 ppb
2019-05-145867-807-15158.00 ppb
2019-05-155867-801-10208.00 ppb
2019-05-155867-802-101010.00 ppb
2019-05-155867-803-09409.00 ppb
2019-05-155867-804-08559.00 ppb
2019-05-155867-808-08306.00 ppb
2019-08-135867-801-09209.00 ppb
2019-08-135867-802-08409.00 ppb
2019-08-135867-803-10059.00 ppb
2019-08-135867-804-08253.00 ppb
2019-08-135867-805-13254.00 ppb
2019-08-135867-806-12359.00 ppb
2019-08-135867-807-12009.00 ppb
2019-08-135867-808-11303.00 ppb
2019-11-195867-801-111018.0 ppb
2019-11-195867-802-104521.0 ppb
2019-11-195867-803-102519.0 ppb
2019-11-195867-804-094516.0 ppb
2019-11-195867-805-08052.00 ppb
2019-11-195867-806-084520.0 ppb
2019-11-195867-807-090517.0 ppb
2019-11-195867-808-092516.0 ppb