Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Haloacetic acids (HAA5)

Santa Margarita Water District

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

 

192

Samples

0

Samples exceeding legal limit (MCL)

161

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
201418.2 ppb32322.72 ppb - 26.7 ppb
201511.2 ppb32324.81 ppb - 22.9 ppb
20164.79 ppb3225ND - 12.9 ppb
20174.21 ppb3225ND - 14.0 ppb
20183.80 ppb3224ND - 7.20 ppb
20194.69 ppb3223ND - 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
2014-01-071805-801-070026.0 ppb
2014-01-071805-802-070024.1 ppb
2014-01-071805-803-070018.7 ppb
2014-01-071805-804-070016.6 ppb
2014-01-071805-805-070010.8 ppb
2014-01-071805-806-070017.9 ppb
2014-01-071805-807-070021.4 ppb
2014-01-071805-808-070021.4 ppb
2014-04-031805-801-073026.0 ppb
2014-04-031805-802-073021.3 ppb
2014-04-031805-803-073021.9 ppb
2014-04-031805-804-073020.9 ppb
2014-04-031805-805-073021.3 ppb
2014-04-031805-806-073020.7 ppb
2014-04-031805-807-073019.6 ppb
2014-04-031805-808-073018.4 ppb
2014-07-011805-801-000023.7 ppb
2014-07-011805-802-000025.4 ppb
2014-07-011805-803-000022.8 ppb
2014-07-011805-804-000025.4 ppb
2014-07-011805-805-000025.2 ppb
2014-07-011805-806-000026.7 ppb
2014-07-011805-807-000019.4 ppb
2014-07-011805-808-000024.8 ppb
2014-10-071805-801-00009.76 ppb
2014-10-071805-802-00007.13 ppb
2014-10-071805-803-000013.2 ppb
2014-10-071805-804-00007.93 ppb
2014-10-071805-805-00004.36 ppb
2014-10-071805-806-00002.72 ppb
2014-10-071805-807-00006.49 ppb
2014-10-071805-808-000010.4 ppb
2015-01-061805-801-00008.56 ppb
2015-01-061805-802-00004.81 ppb
2015-01-061805-803-000017.9 ppb
2015-01-061805-804-000014.1 ppb
2015-01-061805-805-000017.8 ppb
2015-01-061805-806-00009.94 ppb
2015-01-061805-807-000015.1 ppb
2015-01-061805-808-000014.4 ppb
2015-04-061805-801-09499.22 ppb
2015-04-061805-802-095811.1 ppb
2015-04-061805-803-101414.3 ppb
2015-04-061805-804-105110.3 ppb
2015-04-061805-805-13336.32 ppb
2015-04-061805-806-15075.39 ppb
2015-04-061805-807-14226.91 ppb
2015-04-061805-808-08496.43 ppb
2015-07-071805-801-000014.6 ppb
2015-07-071805-802-000013.1 ppb
2015-07-071805-803-000013.5 ppb
2015-07-071805-804-000014.0 ppb
2015-07-081805-805-00008.69 ppb
2015-07-081805-806-00007.97 ppb
2015-07-081805-807-00007.58 ppb
2015-07-091805-808-000013.5 ppb
2015-10-051805-801-08428.36 ppb
2015-10-051805-802-085810.4 ppb
2015-10-051805-803-091522.9 ppb
2015-10-051805-804-09579.00 ppb
2015-10-051805-805-133110.5 ppb
2015-10-051805-806-15459.31 ppb
2015-10-051805-807-152910.4 ppb
2015-10-071805-808-110310.5 ppb
2016-01-051805-801-085010.2 ppb
2016-01-051805-802-09049.22 ppb
2016-01-051805-803-091812.9 ppb
2016-01-051805-804-09538.46 ppb
2016-01-051805-805-12398.99 ppb
2016-01-051805-806-155111.6 ppb
2016-01-051805-807-14498.14 ppb
2016-01-061805-808-120411.3 ppb
2016-04-139590-801-0938ND
2016-04-139590-802-0955ND
2016-04-139590-803-1014ND
2016-04-139590-804-15204.10 ppb
2016-04-139590-805-14302.20 ppb
2016-04-139590-806-1622ND
2016-04-139590-807-15285.70 ppb
2016-04-149590-808-10544.60 ppb
2016-07-079590-801-13305.20 ppb
2016-07-079590-802-13504.30 ppb
2016-07-079590-803-14102.00 ppb
2016-07-079590-804-14255.20 ppb
2016-07-079590-805-15005.00 ppb
2016-07-079590-806-15302.00 ppb
2016-07-079590-807-15155.40 ppb
2016-07-079590-808-12555.70 ppb
2016-10-069590-801-12034.80 ppb
2016-10-069590-802-13324.10 ppb
2016-10-069590-803-1352ND
2016-10-069590-804-10484.90 ppb
2016-10-069590-805-1113ND
2016-10-069590-806-1416ND
2016-10-069590-807-11352.30 ppb
2016-10-069590-808-10005.00 ppb
2017-01-069590-801-1002ND
2017-01-069590-802-1023ND
2017-01-069590-803-1050ND
2017-01-069590-804-11182.90 ppb
2017-01-069590-805-11404.30 ppb
2017-01-069590-806-1227ND
2017-01-069590-807-12522.00 ppb
2017-01-069590-808-11574.30 ppb
2017-04-069590-801-08505.50 ppb
2017-04-069590-802-09159.60 ppb
2017-04-069590-803-09353.00 ppb
2017-04-069590-804-09588.40 ppb
2017-04-069590-805-103011.0 ppb
2017-04-069590-806-11099.60 ppb
2017-04-069590-807-10506.20 ppb
2017-04-069590-808-093714.0 ppb
2017-07-069590-801-10326.00 ppb
2017-07-069590-802-10502.60 ppb
2017-07-069590-803-11074.10 ppb
2017-07-069590-804-12084.50 ppb
2017-07-069590-805-13003.50 ppb
2017-07-069590-806-1338ND
2017-07-069590-807-1242ND
2017-07-069590-808-08202.40 ppb
2017-10-059590-801-10424.50 ppb
2017-10-059590-802-10553.60 ppb
2017-10-059590-803-1108ND
2017-10-059590-804-11264.50 ppb
2017-10-059590-805-12254.30 ppb
2017-10-059590-806-12594.20 ppb
2017-10-059590-807-12454.10 ppb
2017-10-059590-808-08575.60 ppb
2018-01-049590-801-13304.80 ppb
2018-01-049590-802-13114.50 ppb
2018-01-049590-803-12515.30 ppb
2018-01-049590-804-12256.10 ppb
2018-01-049590-805-11575.00 ppb
2018-01-049590-806-11114.80 ppb
2018-01-049590-807-11285.00 ppb
2018-01-049590-808-08285.50 ppb
2018-04-059590-801-10096.20 ppb
2018-04-059590-802-10213.60 ppb
2018-04-059590-803-10395.60 ppb
2018-04-059590-804-10584.60 ppb
2018-04-059590-805-1329ND
2018-04-059590-806-1253ND
2018-04-059590-807-1310ND
2018-04-059590-808-08284.20 ppb
2018-07-039590-801-1252ND
2018-07-039590-802-12394.80 ppb
2018-07-039590-803-1225ND
2018-07-039590-804-11565.10 ppb
2018-07-039590-805-1116ND
2018-07-039590-806-1023ND
2018-07-039590-807-10472.80 ppb
2018-07-039590-808-09505.10 ppb
2018-10-049590-801-10047.20 ppb
2018-10-049590-802-10156.40 ppb
2018-10-049590-803-10286.50 ppb
2018-10-049590-804-10464.30 ppb
2018-10-049590-805-11065.00 ppb
2018-10-049590-806-1153ND
2018-10-049590-807-11313.30 ppb
2018-10-049590-808-09286.00 ppb
2019-01-109590-801-09565.30 ppb
2019-01-109590-802-1017ND
2019-01-109590-803-10404.50 ppb
2019-01-109590-804-11012.40 ppb
2019-01-109590-805-1259ND
2019-01-109590-806-1343ND
2019-01-109590-808-08285.20 ppb
2019-01-159590-807-1350ND
2019-04-049590-801-08235.60 ppb
2019-04-049590-802-0837ND
2019-04-049590-803-09007.60 ppb
2019-04-049590-804-09308.00 ppb
2019-04-049590-805-09562.10 ppb
2019-04-049590-806-11102.00 ppb
2019-04-049590-807-1041ND
2019-04-049590-808-12416.10 ppb
2019-07-259590-801-104316.0 ppb
2019-07-259590-802-10594.40 ppb
2019-07-259590-803-1125ND
2019-07-259590-804-11474.00 ppb
2019-07-259590-805-130010.00 ppb
2019-07-259590-806-135714.0 ppb
2019-07-259590-807-132615.0 ppb
2019-07-259590-808-093213.0 ppb
2019-10-089590-801-11034.80 ppb
2019-10-089590-802-11203.10 ppb
2019-10-089590-803-11593.70 ppb
2019-10-089590-804-12203.80 ppb
2019-10-089590-805-1314ND
2019-10-089590-806-1441ND
2019-10-089590-807-14032.40 ppb
2019-10-089590-808-08517.20 ppb