Know Your Environment. Protect Your Health.

Haloacetic acids (HAA5)

Regional Water Authority

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.

 

292

Samples

7

Samples exceeding legal limit (MCL)

292

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201843.5 ppb484814.1 ppb - 70.6 ppb
201929.5 ppb484818.3 ppb - 44.3 ppb
202029.8 ppb50501.10 ppb - 45.1 ppb
202130.7 ppb49491.50 ppb - 44.9 ppb
202232.8 ppb49491.06 ppb - 50.2 ppb
202331.0 ppb484816.9 ppb - 49.8 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2018-03-06DBP 20048926857.5 ppb
2018-03-06DBP 20048927570.6 ppb
2018-03-06DBP 20048928762.5 ppb
2018-03-07DBP 20048953735.2 ppb
2018-03-07DBP 20048953862.8 ppb
2018-03-07DBP 20048953967.5 ppb
2018-03-07DBP 20048954065.3 ppb
2018-03-07DBP 20048954155.4 ppb
2018-03-08DBP 20048956527.2 ppb
2018-03-09DBP 20048970165.5 ppb
2018-03-09DBP 20048970269.7 ppb
2018-03-09DBP 20048970347.3 ppb
2018-06-05DBP 20049598439.8 ppb
2018-06-05DBP 20049598942.8 ppb
2018-06-05DBP 20049600244.4 ppb
2018-06-06DBP 20049623541.3 ppb
2018-06-07DBP 20049637538.7 ppb
2018-06-07DBP 20049637647.2 ppb
2018-06-07DBP 20049641733.6 ppb
2018-06-08DBP 20049650748.7 ppb
2018-06-08DBP 20049650844.5 ppb
2018-06-08DBP 20049650949.3 ppb
2018-06-08DBP 20049651053.1 ppb
2018-06-08DBP 20049651144.9 ppb
2018-09-04DBP 20050373239.8 ppb
2018-09-04DBP 20050373729.3 ppb
2018-09-04DBP 20050384234.3 ppb
2018-09-04DBP 20050391236.4 ppb
2018-09-04DBP 20050391338.2 ppb
2018-09-04DBP 20050391441.4 ppb
2018-09-05DBP 20050398139.0 ppb
2018-09-05DBP 20050408634.8 ppb
2018-09-05DBP 20050408718.3 ppb
2018-09-06DBP 20050418514.1 ppb
2018-09-06DBP 20050421127.1 ppb
2018-09-07DBP 20050444142.3 ppb
2018-12-03DBP 20051437217.2 ppb
2018-12-03DBP 20051440639.9 ppb
2018-12-04DBP 20051444739.9 ppb
2018-12-04DBP 20051445243.8 ppb
2018-12-04DBP 20051462546.7 ppb
2018-12-04DBP 20051462641.9 ppb
2018-12-04DBP 20051462740.9 ppb
2018-12-04DBP 20051462838.5 ppb
2018-12-04DBP 20051462937.7 ppb
2018-12-05DBP 20051495240.9 ppb
2018-12-06DBP 20051506938.5 ppb
2018-12-06DBP 20051507050.7 ppb
2019-03-04DBP 20052321521.7 ppb
2019-03-04DBP 20052321729.3 ppb
2019-03-05DBP 20052326226.7 ppb
2019-03-05DBP 20052326929.3 ppb
2019-03-05DBP 20052345631.6 ppb
2019-03-05DBP 20052345744.3 ppb
2019-03-05DBP 20052345830.6 ppb
2019-03-05DBP 20052345928.6 ppb
2019-03-05DBP 20052346318.3 ppb
2019-03-07DBP 20052388429.1 ppb
2019-03-08DBP 20052400023.2 ppb
2019-03-08DBP 20052400234.1 ppb
2019-06-03DBP 20053437329.0 ppb
2019-06-03DBP 20053441425.7 ppb
2019-06-04DBP 20053449126.0 ppb
2019-06-04DBP 20053449627.5 ppb
2019-06-04DBP 20053460028.7 ppb
2019-06-04DBP 20053472528.3 ppb
2019-06-04DBP 20053472732.7 ppb
2019-06-04DBP 20053472938.5 ppb
2019-06-05DBP 20053503934.9 ppb
2019-06-05DBP 20053504128.7 ppb
2019-06-06DBP 20053519728.6 ppb
2019-06-07DBP 20053535727.6 ppb
2019-09-03DBP 20054698832.9 ppb
2019-09-03DBP 20054699322.0 ppb
2019-09-04DBP 20054740019.3 ppb
2019-09-04DBP 20054740232.8 ppb
2019-09-04DBP 20054740336.3 ppb
2019-09-04DBP 20054740432.5 ppb
2019-09-04DBP 20054740532.8 ppb
2019-09-05DBP 20054746023.2 ppb
2019-09-05DBP 20054766730.4 ppb
2019-09-06DBP 20054782635.2 ppb
2019-09-06DBP 20054782733.3 ppb
2019-09-06DBP 20054782835.9 ppb
2019-12-02DBP 20055840538.1 ppb
2019-12-02DBP 20055840630.1 ppb
2019-12-02DBP 20055840733.1 ppb
2019-12-03DBP 20055845427.9 ppb
2019-12-03DBP 20055845931.4 ppb
2019-12-03DBP 20055861230.3 ppb
2019-12-04DBP 20055891627.0 ppb
2019-12-04DBP 20055891728.5 ppb
2019-12-04DBP 20055891918.9 ppb
2019-12-05DBP 20055907329.1 ppb
2019-12-05DBP 20055909824.7 ppb
2019-12-06DBP 20055919527.2 ppb
2020-03-02DBP 20056771335.5 ppb
2020-03-02DBP 20056771445.1 ppb
2020-03-02DBP 20056771541.1 ppb
2020-03-02DBP 20056771831.6 ppb
2020-03-03DBP 20056778033.1 ppb
2020-03-03DBP 20056778738.9 ppb
2020-03-03DBP 20056792025.2 ppb
2020-03-03DBP 20056792130.0 ppb
2020-03-04DBP 20056817734.5 ppb
2020-03-04DBP 20056817831.7 ppb
2020-03-05DBP 2005682851.10 ppb
2020-03-05DBP 20056838429.8 ppb
2020-03-12DBP 20056916431.6 ppb
2020-06-01DBP 20057726434.3 ppb
2020-06-01DBP 20057726543.3 ppb
2020-06-01DBP 20057726635.2 ppb
2020-06-02DBP 20057731832.4 ppb
2020-06-02DBP 20057732730.2 ppb
2020-06-02DBP 20057739938.8 ppb
2020-06-02DBP 20057740128.2 ppb
2020-06-03DBP 20057771929.2 ppb
2020-06-03DBP 20057772140.4 ppb
2020-06-04DBP 20057795429.1 ppb
2020-06-04DBP 20057795532.2 ppb
2020-06-05DBP 20057807727.0 ppb
2020-09-08DBP 20058910928.9 ppb
2020-09-08DBP 20058911833.0 ppb
2020-09-08DBP 20058925235.5 ppb
2020-09-08DBP 20058925330.3 ppb
2020-09-08DBP 20058925417.0 ppb
2020-09-09DBP 20058956035.2 ppb
2020-09-09DBP 20058956135.7 ppb
2020-09-10DBP 20058979726.4 ppb
2020-09-10DBP 20058979915.0 ppb
2020-09-10DBP 20058980331.6 ppb
2020-09-10DBP 20058980629.9 ppb
2020-09-11DBP 20058986828.9 ppb
2020-12-07DBP 20060013632.2 ppb
2020-12-07DBP 20060013728.4 ppb
2020-12-08DBP 20060032624.2 ppb
2020-12-08DBP 20060040726.6 ppb
2020-12-08DBP 20060040829.4 ppb
2020-12-09DBP 20060056218.2 ppb
2020-12-09DBP 20060060721.1 ppb
2020-12-09DBP 20060065329.4 ppb
2020-12-09DBP 20060065628.7 ppb
2020-12-10DBP 20060088226.4 ppb
2020-12-10DBP 20060088422.3 ppb
2020-12-10DBP 200600884B22.3 ppb
2020-12-11DBP 20060095423.7 ppb
2021-03-08DBP 20060880928.5 ppb
2021-03-08DBP 20060883526.1 ppb
2021-03-08DBP 20060883630.4 ppb
2021-03-08DBP 20060883726.6 ppb
2021-03-09DBP 20060891424.5 ppb
2021-03-09DBP 20060908933.3 ppb
2021-03-09DBP 20060909018.8 ppb
2021-03-09DBP 20060909322.7 ppb
2021-03-10DBP 20060925123.1 ppb
2021-03-10DBP 20060925231.7 ppb
2021-03-11DBP 2006094201.50 ppb
2021-03-11DBP 20060951229.1 ppb
2021-03-12DBP 20060958428.4 ppb
2021-06-07DBP 20061968028.4 ppb
2021-06-07DBP 20061967832.6 ppb
2021-06-07DBP 20061967934.4 ppb
2021-06-08DBP 20061980029.4 ppb
2021-06-08DBP 20061980230.4 ppb
2021-06-08DBP 20061992039.8 ppb
2021-06-08DBP 20061992117.6 ppb
2021-06-08DBP 20061992220.5 ppb
2021-06-09DBP 20062017340.2 ppb
2021-06-10DBP 20062049331.7 ppb
2021-06-10DBP 20062049528.1 ppb
2021-06-11DBP 20062058324.3 ppb
2021-09-13300057530 30005753139.1 ppb
2021-09-13300057533 30005753444.0 ppb
2021-09-13300057536 30005753744.9 ppb
2021-09-14300058253 30005825638.0 ppb
2021-09-14300058258 30005826132.9 ppb
2021-09-14300059322 30005932522.3 ppb
2021-09-14300059327 30005932834.7 ppb
2021-09-14300059398 30005939922.3 ppb
2021-09-15300060630 30006063134.3 ppb
2021-09-16300061467 30006146843.6 ppb
2021-09-16300061470 30006147134.4 ppb
2021-09-17300062097 30006209829.6 ppb
2021-12-13D300117139 30011714041.0 ppb
2021-12-13D300117142 30011714336.9 ppb
2021-12-13D300117145 30011714633.4 ppb
2021-12-13D300117148 30011714940.2 ppb
2021-12-13D300118224 30011822724.9 ppb
2021-12-13D300118229 30011823024.5 ppb
2021-12-14D300117272 30011727532.9 ppb
2021-12-14D300117277 30011728039.2 ppb
2021-12-15D300119211 30011921228.4 ppb
2021-12-16D300120051 30012005238.6 ppb
2021-12-16D300120054 30012005533.9 ppb
2021-12-17D300120678 30012067926.9 ppb
2022-03-07D300153474 30015347534.3 ppb
2022-03-07D300153477 30015347840.8 ppb
2022-03-07D300153480 30015348131.3 ppb
2022-03-08D300153988 30015399133.7 ppb
2022-03-08D300153993 30015399636.1 ppb
2022-03-08D300154252 30015425525.6 ppb
2022-03-08D300154257 30015425833.9 ppb
2022-03-08D300154260 30015426121.8 ppb
2022-03-09D300155008 30015500930.7 ppb
2022-03-10D300155239 3001552421.06 ppb
2022-03-10D300155826 30015582831.3 ppb
2022-03-10D300155831 30015583335.9 ppb
2022-03-11D300156650 30015665120.3 ppb
2022-06-06D300193482 30019348544.1 ppb
2022-06-06D300193487 30019348939.0 ppb
2022-06-06D300193491 30019349343.9 ppb
2022-06-06D300193495 30019349730.8 ppb
2022-06-07D300194485 30019448720.3 ppb
2022-06-07D300194421 30019442440.4 ppb
2022-06-07D300194474 30019447726.6 ppb
2022-06-08D300194960 30019496239.4 ppb
2022-06-08D300196206 30019620840.9 ppb
2022-06-08D300196210 30019621250.2 ppb
2022-06-08D300196214 30019621645.6 ppb
2022-06-10D300196552 30019655429.4 ppb
2022-09-12D300242309 30024231143.8 ppb
2022-09-12D300242313 30024231536.1 ppb
2022-09-13D300242867 30024287037.6 ppb
2022-09-13D300242872 30024287537.2 ppb
2022-09-13D300243354 30024335714.1 ppb
2022-09-13D300243359 30024336114.7 ppb
2022-09-14D300243943 30024394535.5 ppb
2022-09-14D300243947 30024394932.2 ppb
2022-09-14D300243951 30024395331.0 ppb
2022-09-15D300244400 30024440230.6 ppb
2022-09-15D300244404 30024440631.8 ppb
2022-09-15D300245400 30024540226.5 ppb
2022-12-05D300280513 30028051535.8 ppb
2022-12-05D300280517 30028051944.3 ppb
2022-12-05D300280521 30028052330.3 ppb
2022-12-06D300281387 30028139023.2 ppb
2022-12-06D300281392 30028139438.4 ppb
2022-12-06D300281396 30028139818.8 ppb
2022-12-07D300282133 30028213641.2 ppb
2022-12-07D300282138 30028214140.2 ppb
2022-12-07D300282730 30028273242.4 ppb
2022-12-08D300283547 30028354932.5 ppb
2022-12-08D300283566 30028356833.8 ppb
2022-12-09D300284348 30028435029.7 ppb
2023-03-06D300316509 30031651129.7 ppb
2023-03-06D300316513 30031651535.6 ppb
2023-03-06D300316517 30031651923.2 ppb
2023-03-07D300317097 30031710030.8 ppb
2023-03-07D300317102 30031710531.3 ppb
2023-03-07D300317505 30031750824.9 ppb
2023-03-07D300317510 30031751233.6 ppb
2023-03-07D300317514 30031751621.4 ppb
2023-03-08D300318389 30031839123.1 ppb
2023-03-08D300318393 30031839524.2 ppb
2023-03-09D300319243 30031924530.7 ppb
2023-03-10D300319398 30031940026.5 ppb
2023-06-05D300358943 30035894535.5 ppb
2023-06-05D300358947 30035894939.7 ppb
2023-06-05D300358951 30035895334.5 ppb
2023-06-05D300358955 30035895730.8 ppb
2023-06-06D300358988 30035899128.9 ppb
2023-06-06D300358993 30035899633.1 ppb
2023-06-06D300359847 30035985024.9 ppb
2023-06-06D300359852 30035985416.9 ppb
2023-06-07D300360865 30036086741.5 ppb
2023-06-08D300361983 30036198537.6 ppb
2023-06-08D300361987 30036198941.9 ppb
2023-06-09D300362721 30036272324.6 ppb
2023-09-11D300412854 30041285649.8 ppb
2023-09-11D300412858 30041286041.8 ppb
2023-09-12D300413093 30041309641.7 ppb
2023-09-12D300413098 30041310131.5 ppb
2023-09-12D300413568 30041357122.0 ppb
2023-09-12D300413573 30041357544.4 ppb
2023-09-12D300413577 30041357935.6 ppb
2023-09-12D300413581 30041358321.7 ppb
2023-09-13D300414470 30041447237.0 ppb
2023-09-13D300414474 30041447641.3 ppb
2023-09-14D300415299 30041530138.9 ppb
2023-09-15D300416083 30041608527.6 ppb
2023-12-04D300454311 30045431328.6 ppb
2023-12-04D300454315 30045431735.1 ppb
2023-12-04D300454322 30045432430.7 ppb
2023-12-05D300454448 30045445126.3 ppb
2023-12-05D300454453 30045445631.4 ppb
2023-12-05D300454954 30045495719.4 ppb
2023-12-05D300454962 30045496429.1 ppb
2023-12-05D300454972 30045497419.4 ppb
2023-12-06D300455828 30045583022.6 ppb
2023-12-06D300455832 30045583423.9 ppb
2023-12-07D300456845 30045684729.7 ppb
2023-12-08D300457513 30045751532.6 ppb