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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

California Water Service (CWS) - Bakersfield

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

 

200

Samples

10

Samples exceeding legal limit (MCL)

165

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201410.5 ppb3218ND - 44.0 ppb
201514.2 ppb3225ND - 51.0 ppb
201635.7 ppb3228ND - 73.0 ppb
201733.1 ppb3733ND - 77.0 ppb
201835.0 ppb3533ND - 65.0 ppb
201930.9 ppb3228ND - 69.0 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
2014-01-215810-900-10124.20 ppb
2014-01-215810-901-131534.0 ppb
2014-01-215810-902-123511.0 ppb
2014-01-215810-903-1145ND
2014-01-215810-904-10325.20 ppb
2014-01-215810-905-0930ND
2014-01-215810-906-0956ND
2014-01-215810-907-1200ND
2014-04-215810-900-165117.0 ppb
2014-04-215810-901-141041.0 ppb
2014-04-215810-902-143740.0 ppb
2014-04-215810-903-1502ND
2014-04-215810-904-161639.0 ppb
2014-04-215810-905-1541ND
2014-04-215810-906-181131.0 ppb
2014-04-215810-907-1450ND
2014-07-235810-900-10455.00 ppb
2014-07-235810-901-130531.0 ppb
2014-07-235810-902-12305.50 ppb
2014-07-235810-903-1105ND
2014-07-235810-904-11355.40 ppb
2014-07-235810-905-0935ND
2014-07-235810-906-10205.40 ppb
2014-07-235810-907-1120ND
2014-10-235810-900-11325.20 ppb
2014-10-235810-901-124244.0 ppb
2014-10-235810-902-11478.20 ppb
2014-10-235810-903-1042ND
2014-10-235810-904-12075.20 ppb
2014-10-235810-905-1022ND
2014-10-235810-906-1117ND
2014-10-235810-907-1057ND
2015-01-215810-900-110219.0 ppb
2015-01-215810-901-135234.0 ppb
2015-01-215810-902-111726.0 ppb
2015-01-215810-903-1307ND
2015-01-215810-904-11328.30 ppb
2015-01-215810-905-0947ND
2015-01-215810-906-10425.00 ppb
2015-01-215810-907-125222.0 ppb
2015-04-275810-900-10099.50 ppb
2015-04-275810-901-124522.0 ppb
2015-04-275810-902-102613.0 ppb
2015-04-275810-903-1121ND
2015-04-275810-904-105019.0 ppb
2015-04-275810-905-1347ND
2015-04-275810-906-09355.80 ppb
2015-04-275810-907-11097.00 ppb
2015-07-225810-900-12208.90 ppb
2015-07-225810-901-131051.0 ppb
2015-07-225810-902-12004.50 ppb
2015-07-225810-903-1400ND
2015-07-225810-904-11403.50 ppb
2015-07-225810-905-1420ND
2015-07-225810-906-11203.90 ppb
2015-07-225810-907-13403.90 ppb
2015-10-195810-900-10079.40 ppb
2015-10-195810-901-120740.0 ppb
2015-10-195810-902-103645.0 ppb
2015-10-195810-903-113716.0 ppb
2015-10-195810-904-110446.0 ppb
2015-10-195810-905-1501ND
2015-10-195810-906-09479.40 ppb
2015-10-195810-907-111422.0 ppb
2016-01-205810-900-135228.0 ppb
2016-01-205810-901-101548.0 ppb
2016-01-205810-902-094538.0 ppb
2016-01-205810-903-090023.0 ppb
2016-01-205810-904-140246.0 ppb
2016-01-205810-905-1313ND
2016-01-205810-906-13387.70 ppb
2016-01-205810-907-092027.0 ppb
2016-04-185810-900-112053.0 ppb
2016-04-185810-901-121073.0 ppb
2016-04-185810-902-113050.0 ppb
2016-04-185810-903-130046.0 ppb
2016-04-185810-904-114551.0 ppb
2016-04-185810-905-0915ND
2016-04-185810-906-110043.0 ppb
2016-04-185810-907-124025.0 ppb
2016-07-185810-900-094139.0 ppb
2016-07-185810-901-104553.0 ppb
2016-07-185810-902-095146.0 ppb
2016-07-185810-903-113214.0 ppb
2016-07-185810-904-101445.0 ppb
2016-07-185810-905-1226ND
2016-07-185810-906-092547.0 ppb
2016-07-185810-907-111046.0 ppb
2016-10-185810-900-141552.0 ppb
2016-10-185810-901-115047.0 ppb
2016-10-185810-902-112048.0 ppb
2016-10-185810-903-133034.0 ppb
2016-10-185810-904-105546.0 ppb
2016-10-185810-905-1505ND
2016-10-185810-906-144033.0 ppb
2016-10-185810-907-135033.0 ppb
2017-01-175810-900-102420.0 ppb
2017-01-175810-901-110851.0 ppb
2017-01-175810-902-104834.0 ppb
2017-01-175810-903-13034.50 ppb
2017-01-175810-904-103528.0 ppb
2017-01-175810-905-0908ND
2017-01-175810-906-093319.0 ppb
2017-01-175810-907-112821.0 ppb
2017-04-175810-900-132668.0 ppb
2017-04-175810-901-144575.0 ppb
2017-04-175810-902-135465.0 ppb
2017-04-175810-903-142138.0 ppb
2017-04-175810-904-134463.0 ppb
2017-04-175810-905-1249ND
2017-04-175810-906-131359.0 ppb
2017-04-175810-907-140977.0 ppb
2017-05-305810-900-102649.0 ppb
2017-05-305810-901-114841.0 ppb
2017-05-305810-902-100064.0 ppb
2017-05-305810-904-101641.0 ppb
2017-05-305810-907-131527.0 ppb
2017-07-175810-900-140636.0 ppb
2017-07-175810-901-133918.0 ppb
2017-07-175810-902-125234.0 ppb
2017-07-175810-903-144712.0 ppb
2017-07-175810-905-1328ND
2017-07-175810-906-135336.0 ppb
2017-07-175810-907-131015.0 ppb
2017-08-029590-904-093032.0 ppb
2017-10-165810-900-111242.0 ppb
2017-10-165810-901-143047.0 ppb
2017-10-165810-902-124829.0 ppb
2017-10-165810-903-13477.00 ppb
2017-10-165810-904-113928.0 ppb
2017-10-165810-905-0947ND
2017-10-165810-906-104030.0 ppb
2017-10-165810-907-131713.0 ppb
2018-01-185810-900-105030.0 ppb
2018-01-185810-901-122552.0 ppb
2018-01-185810-902-110032.0 ppb
2018-01-185810-903-130522.0 ppb
2018-01-185810-904-112046.0 ppb
2018-01-185810-905-094029.0 ppb
2018-01-185810-906-103522.0 ppb
2018-01-185810-907-125044.0 ppb
2018-04-165810-900-100058.0 ppb
2018-04-165810-901-113056.0 ppb
2018-04-165810-902-102560.0 ppb
2018-04-165810-903-123544.0 ppb
2018-04-165810-904-104565.0 ppb
2018-04-165810-905-0905ND
2018-04-165810-906-095017.0 ppb
2018-04-165810-907-120560.0 ppb
2018-05-105810-902-140045.0 ppb
2018-05-105810-904-143053.0 ppb
2018-05-105810-907-14458.70 ppb
2018-07-175810-900-093039.0 ppb
2018-07-175810-901-113528.0 ppb
2018-07-175810-902-095032.0 ppb
2018-07-175810-903-110513.0 ppb
2018-07-175810-904-101029.0 ppb
2018-07-175810-905-0845ND
2018-07-175810-906-091525.0 ppb
2018-07-175810-907-104024.0 ppb
2018-10-165810-900-115531.0 ppb
2018-10-165810-901-131541.0 ppb
2018-10-165810-902-120034.0 ppb
2018-10-165810-903-125028.0 ppb
2018-10-165810-904-121554.0 ppb
2018-10-165810-905-111039.0 ppb
2018-10-165810-906-113531.0 ppb
2018-10-165810-907-123533.0 ppb
2019-01-145810-900-094527.0 ppb
2019-01-145810-901-130040.0 ppb
2019-01-145810-902-100525.0 ppb
2019-01-145810-903-105015.0 ppb
2019-01-145810-904-102021.0 ppb
2019-01-145810-905-0905ND
2019-01-145810-906-093514.0 ppb
2019-01-145810-907-103530.0 ppb
2019-04-155810-900-094553.0 ppb
2019-04-155810-901-112069.0 ppb
2019-04-155810-902-100062.0 ppb
2019-04-155810-903-120047.0 ppb
2019-04-155810-904-102053.0 ppb
2019-04-155810-905-0845ND
2019-04-155810-906-093051.0 ppb
2019-04-155810-907-114548.0 ppb
2019-07-165810-900-102037.0 ppb
2019-07-165810-901-114042.0 ppb
2019-07-165810-902-103533.0 ppb
2019-07-165810-903-111046.0 ppb
2019-07-165810-904-105032.0 ppb
2019-07-165810-905-0941ND
2019-07-165810-906-100513.0 ppb
2019-07-165810-907-110035.0 ppb
2019-10-235810-900-113927.0 ppb
2019-10-235810-901-111532.0 ppb
2019-10-235810-902-133828.0 ppb
2019-10-235810-903-104137.0 ppb
2019-10-235810-904-132825.0 ppb
2019-10-235810-905-1433ND
2019-10-235810-906-130012.0 ppb
2019-10-235810-907-105435.0 ppb