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EWG's Tap Water Database — 2019 UPDATE

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Haloacetic acids (HAA5)

City of Houston

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.

 

390

Samples

11

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201220.8 ppb7166ND - 72.1 ppb
201316.4 ppb6462ND - 32.0 ppb
201426.1 ppb64642.60 ppb - 50.1 ppb
201532.1 ppb6361ND - 73.1 ppb
201625.1 ppb6462ND - 58.8 ppb
201722.2 ppb6462ND - 44.0 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

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
2012-01-31AB79762ND
2012-01-31AB7976439.4 ppb
2012-01-31AB7976155.2 ppb
2012-01-31AB7975872.1 ppb
2012-01-31AB7976339.6 ppb
2012-01-31AB7976649.5 ppb
2012-01-31AB7975652.3 ppb
2012-01-31AB7975964.3 ppb
2012-01-31AB797606.00 ppb
2012-01-31AB7975752.8 ppb
2012-01-31AB7975561.7 ppb
2012-01-31AB797659.40 ppb
2012-02-01AB79776ND
2012-02-01AB7977011.5 ppb
2012-02-01AB797729.90 ppb
2012-02-01AB7976711.8 ppb
2012-02-01AB7976914.9 ppb
2012-02-01AB7977150.1 ppb
2012-02-01AB79784ND
2012-02-01AB7977510.9 ppb
2012-02-01AB7978319.0 ppb
2012-02-01AB7977842.2 ppb
2012-02-01AB7977752.1 ppb
2012-06-11AB9217314.2 ppb
2012-06-11AB9219424.1 ppb
2012-06-11AB9218621.7 ppb
2012-06-11AB9217126.5 ppb
2012-06-11AB9219723.7 ppb
2012-06-11AB9219318.8 ppb
2012-06-11AB9219824.4 ppb
2012-06-11AB9217227.6 ppb
2012-06-11AB9217017.7 ppb
2012-06-12AB9235217.4 ppb
2012-06-12AB9234720.6 ppb
2012-06-12AB9235318.8 ppb
2012-06-12AB9234319.9 ppb
2012-06-12AB923481.10 ppb
2012-06-12AB9235125.5 ppb
2012-06-12AB9234420.5 ppb
2012-09-19AC0127912.4 ppb
2012-09-19AC01289ND
2012-09-19AC0128424.9 ppb
2012-09-19AC0128313.8 ppb
2012-09-19AC0128217.8 ppb
2012-09-19AC0128019.7 ppb
2012-09-19AC0127612.4 ppb
2012-09-19AC0128615.8 ppb
2012-09-19AC0127713.7 ppb
2012-09-19AC0128121.1 ppb
2012-09-19AC0128513.3 ppb
2012-09-19AC0129014.3 ppb
2012-09-20AC0154517.4 ppb
2012-09-20AC0154111.9 ppb
2012-09-20AC015427.00 ppb
2012-09-20AC0154415.4 ppb
2012-11-07AC0489313.9 ppb
2012-11-07AC0489710.3 ppb
2012-11-07AC0489418.0 ppb
2012-11-07AC0488313.9 ppb
2012-11-07AC0489110.6 ppb
2012-11-07AC0489614.2 ppb
2012-11-07AC0488710.6 ppb
2012-11-07AC0489514.7 ppb
2012-11-07AC0489813.1 ppb
2012-11-07AC0488912.7 ppb
2012-11-08AC04890ND
2012-11-08AC0488213.6 ppb
2012-11-08AC0488413.8 ppb
2012-11-08AC0488613.2 ppb
2012-11-08AC0488513.3 ppb
2012-11-08AC0489212.2 ppb
2013-02-25AC11563ND
2013-02-25AC1155817.3 ppb
2013-02-25AC1154917.6 ppb
2013-02-25AC1155916.3 ppb
2013-02-25AC1155315.6 ppb
2013-02-25AC1155018.7 ppb
2013-02-25AC1155415.6 ppb
2013-02-26AC1173214.6 ppb
2013-02-26AC1173315.9 ppb
2013-02-26AC1173412.5 ppb
2013-02-26AC1173513.3 ppb
2013-02-26AC1173913.4 ppb
2013-02-26AC117307.10 ppb
2013-02-26AC1174113.9 ppb
2013-02-26AC1173814.4 ppb
2013-02-26AC1173114.8 ppb
2013-06-12AC2205812.7 ppb
2013-06-12AC2205515.3 ppb
2013-06-12AC2205712.9 ppb
2013-06-12AC2205617.4 ppb
2013-06-12AC2206717.0 ppb
2013-06-12AC2206818.9 ppb
2013-06-12AC2205419.0 ppb
2013-06-12AC2207719.9 ppb
2013-06-13AC2207624.4 ppb
2013-06-13AC2206519.3 ppb
2013-06-13AC2206912.1 ppb
2013-06-13AC2205315.6 ppb
2013-06-13AC2206410.2 ppb
2013-06-13AC2206019.7 ppb
2013-06-13AC2209519.5 ppb
2013-06-13AC2207116.8 ppb
2013-09-24AC3116013.8 ppb
2013-09-24AC311657.40 ppb
2013-09-24AC3116114.4 ppb
2013-09-24AC3116310.3 ppb
2013-09-24AC3116717.1 ppb
2013-09-24AC3116213.7 ppb
2013-09-24AC3116413.4 ppb
2013-09-24AC311682.90 ppb
2013-09-24AC3117014.9 ppb
2013-09-24AC3116917.3 ppb
2013-09-24AC3116613.7 ppb
2013-09-24AC3115913.6 ppb
2013-09-24AC3117216.7 ppb
2013-09-25AC3133216.2 ppb
2013-09-25AC3132213.2 ppb
2013-09-25AC3133415.5 ppb
2013-12-16AC376357.70 ppb
2013-12-16AC3764015.3 ppb
2013-12-16AC3763922.1 ppb
2013-12-16AC3764115.9 ppb
2013-12-16AC3763823.9 ppb
2013-12-16AC3764221.1 ppb
2013-12-17AC3779832.0 ppb
2013-12-17AC3780421.9 ppb
2013-12-17AC3780528.6 ppb
2013-12-17AC3780125.8 ppb
2013-12-17AC3780327.5 ppb
2013-12-17AC37802ND
2013-12-17AC3779730.2 ppb
2013-12-17AC3779631.0 ppb
2013-12-17AC3780824.3 ppb
2013-12-17AC3780617.0 ppb
2014-03-05AC4566739.8 ppb
2014-03-05AC4566636.0 ppb
2014-03-05AC4564930.7 ppb
2014-03-05AC4566346.8 ppb
2014-03-05AC4565036.5 ppb
2014-03-05AC4565227.6 ppb
2014-03-05AC4568750.0 ppb
2014-03-05AC456886.60 ppb
2014-03-05AC4566232.2 ppb
2014-03-05AC4566550.1 ppb
2014-03-05AC4565130.5 ppb
2014-03-05AC4566939.8 ppb
2014-03-05AC4564834.0 ppb
2014-03-06AC4596537.9 ppb
2014-03-06AC4594338.9 ppb
2014-03-06AC4596840.2 ppb
2014-05-19AC5455828.1 ppb
2014-05-19AC5455929.5 ppb
2014-05-19AC5457426.0 ppb
2014-05-19AC5456025.7 ppb
2014-05-19AC5456623.8 ppb
2014-05-19AC5455226.3 ppb
2014-05-19AC5455622.7 ppb
2014-05-19AC5456329.5 ppb
2014-05-19AC5455329.7 ppb
2014-05-19AC5456828.8 ppb
2014-05-20AC5471611.1 ppb
2014-05-20AC5474824.1 ppb
2014-05-20AC5470821.8 ppb
2014-05-20AC5471925.6 ppb
2014-05-20AC5471527.1 ppb
2014-05-20AC547137.80 ppb
2014-07-15AC5975328.8 ppb
2014-07-15AC5975720.8 ppb
2014-07-15AC5975431.9 ppb
2014-07-15AC5975524.3 ppb
2014-07-15AC5975228.8 ppb
2014-07-15AC5974924.7 ppb
2014-07-15AC5977027.8 ppb
2014-07-15AC5976931.9 ppb
2014-07-15AC5975035.7 ppb
2014-07-15AC5975134.8 ppb
2014-07-15AC5975633.6 ppb
2014-07-16AC5987927.6 ppb
2014-07-16AC5987827.6 ppb
2014-07-16AC5989224.3 ppb
2014-07-16AC598932.60 ppb
2014-07-16AC5989727.9 ppb
2014-12-18AC7544016.5 ppb
2014-12-18AC7545318.0 ppb
2014-12-18AC7544817.4 ppb
2014-12-18AC7544615.6 ppb
2014-12-18AC7545114.2 ppb
2014-12-18AC7544716.3 ppb
2014-12-19AC7563118.2 ppb
2014-12-19AC7562814.4 ppb
2014-12-19AC7564918.3 ppb
2014-12-19AC7563714.1 ppb
2014-12-19AC7564519.0 ppb
2014-12-19AC7562912.6 ppb
2014-12-19AC7562519.2 ppb
2014-12-19AC7562620.5 ppb
2014-12-19AC7563819.2 ppb
2014-12-19AC7563318.6 ppb
2015-03-04AC8267626.0 ppb
2015-03-04AC8267925.3 ppb
2015-03-04AC8273322.1 ppb
2015-03-04AC8266923.6 ppb
2015-03-04AC8267525.6 ppb
2015-03-04AC8267126.1 ppb
2015-03-04AC8272819.7 ppb
2015-03-04AC8266722.6 ppb
2015-03-04AC8267227.0 ppb
2015-03-04AC8266826.8 ppb
2015-03-04AC8266421.7 ppb
2015-03-04AC8267325.6 ppb
2015-03-05AC8271212.1 ppb
2015-03-05AC8270811.9 ppb
2015-03-05AC8270718.1 ppb
2015-03-05AC8268838.4 ppb
2015-06-16AC9615158.8 ppb
2015-06-16AC9615446.5 ppb
2015-06-16AC9614553.6 ppb
2015-06-16AC9613946.1 ppb
2015-06-16AC9614250.0 ppb
2015-06-16AC9613758.9 ppb
2015-06-16AC9615552.3 ppb
2015-06-16AC9615061.9 ppb
2015-06-16AC9613861.1 ppb
2015-06-17AC9624365.6 ppb
2015-06-17AC9626065.4 ppb
2015-06-17AC9626273.1 ppb
2015-06-17AC9627467.0 ppb
2015-06-17AC9627370.8 ppb
2015-06-17AC9626562.4 ppb
2015-09-16AD0729419.4 ppb
2015-09-16AD0729728.9 ppb
2015-09-16AD0729332.0 ppb
2015-09-16AD0731225.2 ppb
2015-09-16AD0731324.8 ppb
2015-09-16AD0730431.9 ppb
2015-09-16AD0730226.9 ppb
2015-09-16AD0731118.5 ppb
2015-09-16AD0729228.7 ppb
2015-09-16AD0732931.8 ppb
2015-09-16AD0732722.8 ppb
2015-09-17AD0753718.3 ppb
2015-09-17AD0753818.7 ppb
2015-09-17AD0756318.7 ppb
2015-09-17AD07536ND
2015-09-17AD0754625.7 ppb
2015-11-16AD1356232.1 ppb
2015-11-16AD1361833.6 ppb
2015-11-16AD1356119.5 ppb
2015-11-16AD1355929.1 ppb
2015-11-16AD1361929.6 ppb
2015-11-16AD1355833.6 ppb
2015-11-16AD1356517.5 ppb
2015-11-16AD1355638.8 ppb
2015-11-16AD1355731.9 ppb
2015-11-16AD1356023.4 ppb
2015-11-17AD1376818.9 ppb
2015-11-17AD1377322.0 ppb
2015-11-17AD1376720.6 ppb
2015-11-17AD1377220.8 ppb
2015-11-17AD13771ND
2015-11-17AD1376611.9 ppb
2016-03-16AD2901830.0 ppb
2016-03-16AD2903326.9 ppb
2016-03-16AD2903032.1 ppb
2016-03-16AD2903735.4 ppb
2016-03-16AD2901933.3 ppb
2016-03-16AD2902724.5 ppb
2016-03-16AD2902931.4 ppb
2016-03-16AD2903632.2 ppb
2016-03-16AD2903219.4 ppb
2016-03-16AD2902633.6 ppb
2016-03-17AD2931936.2 ppb
2016-03-17AD2932338.9 ppb
2016-03-17AD2932232.9 ppb
2016-03-17AD2931836.3 ppb
2016-03-17AD29320ND
2016-03-17AD2932135.3 ppb
2016-06-15AD4071845.6 ppb
2016-06-15AD4071437.7 ppb
2016-06-15AD4072245.2 ppb
2016-06-15AD4072539.9 ppb
2016-06-15AD4072649.8 ppb
2016-06-15AD4071639.1 ppb
2016-06-15AD4071946.2 ppb
2016-06-15AD4071034.4 ppb
2016-06-15AD4073046.7 ppb
2016-06-15AD4072742.7 ppb
2016-06-15AD4072051.6 ppb
2016-06-15AD4071732.1 ppb
2016-06-16AD4097238.6 ppb
2016-06-16AD4097135.0 ppb
2016-06-16AD40964ND
2016-06-16AD4096858.8 ppb
2016-09-20AD5032420.8 ppb
2016-09-20AD5032720.0 ppb
2016-09-20AD5033016.0 ppb
2016-09-20AD5032917.6 ppb
2016-09-20AD5032517.4 ppb
2016-09-20AD5032818.6 ppb
2016-09-20AD5032616.0 ppb
2016-09-21AD5070718.7 ppb
2016-09-21AD5068626.8 ppb
2016-09-21AD5069718.9 ppb
2016-09-21AD5070817.9 ppb
2016-09-21AD5071216.5 ppb
2016-09-21AD507103.50 ppb
2016-09-21AD5069619.3 ppb
2016-09-21AD5070617.6 ppb
2016-09-21AD5069517.3 ppb
2016-11-17AD5854314.6 ppb
2016-11-17AD5853814.9 ppb
2016-11-17AD5853918.6 ppb
2016-11-17AD5853614.2 ppb
2016-11-17AD5854413.6 ppb
2016-11-17AD5854515.1 ppb
2016-11-18AD5882511.9 ppb
2016-11-18AD588179.20 ppb
2016-11-18AD5882011.5 ppb
2016-11-18AD588167.70 ppb
2016-11-18AD5881811.1 ppb
2016-11-18AD588159.40 ppb
2016-11-18AD5881911.8 ppb
2016-11-18AD5881410.4 ppb
2016-11-21AD5877414.7 ppb
2016-11-21AD5877514.6 ppb
2017-02-28AD7242222.2 ppb
2017-02-28AD7241922.6 ppb
2017-02-28AD7242415.8 ppb
2017-02-28AD7239917.4 ppb
2017-02-28AD7242120.9 ppb
2017-02-28AD7242018.2 ppb
2017-02-28AD7239816.7 ppb
2017-02-28AD7241820.7 ppb
2017-02-28AD7242325.9 ppb
2017-02-28AD7239717.8 ppb
2017-03-01AD7273917.7 ppb
2017-03-01AD7274217.1 ppb
2017-03-01AD7274517.2 ppb
2017-03-01AD7273716.5 ppb
2017-03-01AD72740ND
2017-03-01AD7273818.8 ppb
2017-04-26AD8114221.3 ppb
2017-04-26AD8114419.0 ppb
2017-04-26AD8113921.8 ppb
2017-04-26AD8114018.9 ppb
2017-04-26AD8113621.9 ppb
2017-04-26AD8113523.6 ppb
2017-04-26AD8114322.0 ppb
2017-04-26AD8114117.2 ppb
2017-04-26AD8114516.2 ppb
2017-04-26AD8114619.3 ppb
2017-04-26AD8113723.3 ppb
2017-04-26AD8113821.8 ppb
2017-04-27AD8147921.9 ppb
2017-04-27AD8147520.4 ppb
2017-04-27AD814781.000 ppb
2017-04-27AD8147719.6 ppb
2017-07-25AD9053025.5 ppb
2017-07-25AD9052234.1 ppb
2017-07-25AD9052533.0 ppb
2017-07-25AD9054323.9 ppb
2017-07-25AD9054518.4 ppb
2017-07-25AD9054427.6 ppb
2017-07-25AD9052327.3 ppb
2017-07-25AD9053227.2 ppb
2017-07-25AD9052429.6 ppb
2017-07-25AD9053133.9 ppb
2017-07-25AD9052124.7 ppb
2017-07-26AD9079927.1 ppb
2017-07-26AD9080423.1 ppb
2017-07-26AD9079625.0 ppb
2017-07-26AD9079713.0 ppb
2017-07-26AD9080226.1 ppb
2017-11-15AE0493637.3 ppb
2017-11-15AE0493332.2 ppb
2017-11-15AE0492525.6 ppb
2017-11-15AE0493034.3 ppb
2017-11-15AE0493119.4 ppb
2017-11-15AE0492425.5 ppb
2017-11-15AE0492625.7 ppb
2017-11-15AE04927ND
2017-11-15AE0492927.3 ppb
2017-11-15AE0493524.1 ppb
2017-11-15AE0492827.9 ppb
2017-11-15AE0493444.0 ppb
2017-11-15AE0493225.8 ppb
2017-11-16AE0518019.9 ppb
2017-11-16AE0518119.1 ppb
2017-11-16AE0518219.8 ppb