Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Haloacetic acids (HAA5)

Rosamond CSD

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

 

67

Samples

0

Samples exceeding legal limit (MCL)

18

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.556 ppb187ND - 2.00 ppb
20150.625 ppb166ND - 3.70 ppb
20160.188 ppb161ND - 3.00 ppb
20170.800 ppb110.800 ppb
20180.450 ppb83ND - 1.30 ppb
2019ND80ND

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
2014-03-113761-019-1045ND
2014-03-113761-020-1035ND
2014-03-113761-021-10151.000 ppb
2014-03-113761-022-1000ND
2014-06-103761-019-0925ND
2014-06-103761-020-0915ND
2014-06-103761-021-0950ND
2014-06-103761-022-0935ND
2014-09-093761-021-1010ND
2014-09-093761-022-09551.30 ppb
2014-09-093761-020-1030ND
2014-09-093761-020-1025ND
2014-09-093761-022-1000ND
2014-09-093761-019-10351.40 ppb
2014-12-093761-021-10302.00 ppb
2014-12-093761-020-10501.20 ppb
2014-12-093761-022-10201.90 ppb
2014-12-093761-019-11001.20 ppb
2015-03-103761-022-1010ND
2015-03-103761-021-10201.000 ppb
2015-03-103761-020-10301.70 ppb
2015-03-103761-019-11001.000 ppb
2015-06-093761-022-10051.60 ppb
2015-06-093761-021-1020ND
2015-06-093761-019-10401.000 ppb
2015-06-093761-020-1030ND
2015-09-083761-021-1010ND
2015-09-083761-020-1020ND
2015-09-083761-019-1030ND
2015-09-083761-022-0955ND
2015-12-083761-021-10553.70 ppb
2015-12-083761-022-1045ND
2015-12-083761-020-1105ND
2015-12-083761-019-1115ND
2016-03-083761-022-0940ND
2016-03-083761-020-0915ND
2016-03-083761-021-09253.00 ppb
2016-03-083761-019-0925ND
2016-06-143761-020-1045ND
2016-06-143761-021-1105ND
2016-06-143761-022-1055ND
2016-06-143761-019-1035ND
2016-09-133761-022-1025ND
2016-09-133761-019-1015ND
2016-09-133761-020-1005ND
2016-09-133761-021-1035ND
2016-12-063761-021-0815ND
2016-12-063761-019-0835ND
2016-12-063761-020-0825ND
2016-12-063761-022-0805ND
2017-06-010.800 ppb*
2018-03-133761-019-1040ND
2018-03-133761-022-1030ND
2018-06-123761-019-1050ND
2018-06-123761-022-1040ND
2018-09-113761-019-10401.10 ppb
2018-09-113761-022-1050ND
2018-12-113761-019-11101.30 ppb
2018-12-113761-022-11001.20 ppb
2019-03-123761-019-1100ND
2019-03-123761-022-1050ND
2019-06-113761-019-1105ND
2019-06-113761-022-1050ND
2019-10-013761-019-1100ND
2019-10-013761-022-1050ND
2019-12-103761-022-1025ND
2019-12-103761-019-1000ND

* Sample result is taken from the system's CCR report.