Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Haloacetic acids (HAA5)

Monterey Park Water Department

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.

 

92

Samples

0

Samples exceeding legal limit (MCL)

32

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.325 ppb123ND - 1.80 ppb
20130.550 ppb166ND - 2.40 ppb
20140.425 ppb164ND - 2.40 ppb
20151.33 ppb1611ND - 3.10 ppb
20160.419 ppb165ND - 1.80 ppb
20170.225 ppb163ND - 1.40 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 on-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
2012-04-239588-800-0900ND
2012-04-239588-801-09301.10 ppb
2012-04-239588-802-0945ND
2012-04-239588-803-0915ND
2012-07-269588-801-1040ND
2012-07-269588-802-1055ND
2012-07-269588-800-1015ND
2012-07-269588-803-1030ND
2012-10-239588-802-1035ND
2012-10-239588-801-1055ND
2012-10-239588-800-11201.000 ppb
2012-10-239588-803-11051.80 ppb
2013-01-239588-803-10351.20 ppb
2013-01-239588-800-1050ND
2013-01-239588-801-1025ND
2013-01-239588-802-1010ND
2013-04-239588-800-10401.30 ppb
2013-04-239588-801-10151.40 ppb
2013-04-239588-802-1005ND
2013-04-239588-803-10251.10 ppb
2013-07-249588-802-1110ND
2013-07-249588-800-1230ND
2013-07-249588-803-1135ND
2013-07-249588-801-1125ND
2013-10-239588-802-0950ND
2013-10-239588-800-10301.40 ppb
2013-10-239588-801-10102.40 ppb
2013-10-239588-803-1020ND
2014-01-239588-802-0955ND
2014-01-239588-801-10051.30 ppb
2014-01-239588-803-1015ND
2014-01-239588-800-1030ND
2014-04-229588-801-1000ND
2014-04-229588-800-1025ND
2014-04-229588-803-1010ND
2014-04-229588-802-0950ND
2014-07-239588-803-1045ND
2014-07-239588-800-1030ND
2014-07-239588-802-1110ND
2014-07-239588-801-1055ND
2014-10-239588-802-10101.80 ppb
2014-10-239588-803-10302.40 ppb
2014-10-239588-800-1045ND
2014-10-239588-801-10201.30 ppb
2015-01-239588-802-09301.20 ppb
2015-01-239588-803-09501.50 ppb
2015-01-239588-801-09401.30 ppb
2015-01-239588-800-1005ND
2015-04-229588-800-1015ND
2015-04-229588-801-0950ND
2015-04-229588-802-09351.50 ppb
2015-04-229588-803-10002.10 ppb
2015-07-239588-800-1015ND
2015-07-239588-801-09502.40 ppb
2015-07-239588-802-09353.10 ppb
2015-07-239588-803-10002.70 ppb
2015-10-269588-803-09501.80 ppb
2015-10-269588-800-10001.40 ppb
2015-10-269588-801-09402.20 ppb
2015-10-269588-802-0930ND
2016-01-269588-802-0955ND
2016-01-269588-803-10151.20 ppb
2016-01-269588-801-10051.10 ppb
2016-01-269588-800-1030ND
2016-04-229588-802-0935ND
2016-04-229588-800-10151.20 ppb
2016-04-229588-803-10001.80 ppb
2016-04-229588-801-0950ND
2016-07-269588-800-1010ND
2016-07-269588-802-0940ND
2016-07-269588-803-0940ND
2016-07-269588-801-0950ND
2016-10-269588-802-1000ND
2016-10-269588-803-1025ND
2016-10-269588-800-1035ND
2016-10-269588-801-10101.40 ppb
2017-01-249588-801-1000ND
2017-01-249588-800-1025ND
2017-01-249588-803-10101.10 ppb
2017-01-249588-802-0950ND
2017-04-249588-801-1135ND
2017-04-249588-803-1120ND
2017-04-249588-800-1110ND
2017-04-249588-802-1145ND
2017-07-279588-801-1050ND
2017-07-279588-803-1115ND
2017-07-279588-800-1130ND
2017-07-279588-802-1100ND
2017-10-249588-800-1025ND
2017-10-249588-801-0955ND
2017-10-249588-802-09401.10 ppb
2017-10-249588-803-10101.40 ppb