Haloacetic acids (HAA5)
Wilmington Water Department
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | 56.0 ppb | 40 | 39 | 10.00 ppb - 90.0 ppb |
| 2016 | 53.0 ppb | 29 | 29 | 10.00 ppb - 79.0 ppb |
| 2017 | 36.1 ppb | 35 | 35 | 11.8 ppb - 73.9 ppb |
| 2018 | 32.0 ppb | 35 | 35 | 13.5 ppb - 51.4 ppb |
| 2019 | 23.1 ppb | 40 | 40 | 9.80 ppb - 38.9 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 |
|---|---|---|
| 2015-01-05 | 2047942001 HAA5 | 11.9 ppb |
| 2015-01-05 | 2047942002 HAA5 | 25.0 ppb |
| 2015-01-05 | 2047942003 HAA5 | 29.4 ppb |
| 2015-01-05 | 2047942004 HAA5 | 24.2 ppb |
| 2015-01-05 | 2047942005 HAA5 | ND |
| 2015-01-05 | 2047942006 HAA5 | 24.7 ppb |
| 2015-01-05 | 2047942007 HAA5 | 25.1 ppb |
| 2015-01-05 | 2047942008 HAA5 | 30.4 ppb |
| 2015-01-05 | 2047942009 HAA5 | 31.6 ppb |
| 2015-04-14 | 2065266001 HAA5 | 10.2 ppb |
| 2015-04-14 | 2065266002 HAA5 | 18.4 ppb |
| 2015-04-14 | 2065266003 HAA5 | 44.1 ppb |
| 2015-04-14 | 2065266004 HAA5 | 37.8 ppb |
| 2015-04-14 | 2065266005 HAA5 | 33.9 ppb |
| 2015-04-14 | 2065266006 HAA5 | 41.0 ppb |
| 2015-04-14 | 2065266007 HAA5 | 47.2 ppb |
| 2015-04-14 | 2065266008 HAA5 | 28.8 ppb |
| 2015-04-14 | 2065266009 HAA5 | 41.5 ppb |
| 2015-04-14 | 2065266010 HAA5 | 38.8 ppb |
| 2015-06-01 | 56.0 ppb* | |
| 2015-06-01 | 56.0 ppb* | |
| 2015-07-08 | 2082331001 HAA5 | 56.5 ppb |
| 2015-07-08 | 2082331002 HAA5 | 81.6 ppb |
| 2015-07-08 | 2082331003 HAA5 | 90.4 ppb |
| 2015-07-08 | 2082331004 HAA5 | 81.9 ppb |
| 2015-07-08 | 2082331005 HAA5 | 78.7 ppb |
| 2015-07-08 | 2082331006 HAA5 | 80.6 ppb |
| 2015-07-08 | 2082331007 HAA5 | 62.4 ppb |
| 2015-07-08 | 2082331008 HAA5 | 20.2 ppb |
| 2015-07-08 | 2082331009 HAA5 | 82.0 ppb |
| 2015-07-08 | 2082331010 HAA5 | 34.0 ppb |
| 2015-10-07 | 2100950001 HAA5 | 32.0 ppb |
| 2015-10-07 | 2100950003 HAA5 | 24.6 ppb |
| 2015-10-07 | 2100950004 HAA5 | 44.5 ppb |
| 2015-10-07 | 2100950005 HAA5 | 42.3 ppb |
| 2015-10-07 | 2100950006 HAA5 | 48.4 ppb |
| 2015-10-07 | 2100950007 HAA5 | 15.4 ppb |
| 2015-10-07 | 2100950008 HAA5 | 42.0 ppb |
| 2015-10-07 | 2100950009 HAA5 | 16.5 ppb |
| 2015-10-07 | 2100950010 HAA5 | 42.6 ppb |
| 2016-04-04 | 2134195001 HAA5 | 14.2 ppb |
| 2016-04-04 | 2134195003 HAA5 | 17.1 ppb |
| 2016-04-04 | 2134195004 HAA5 | 21.8 ppb |
| 2016-04-04 | 2134195005 HAA5 | 11.4 ppb |
| 2016-04-04 | 2134195006 HAA5 | 20.7 ppb |
| 2016-04-04 | 2134195007 HAA5 | 22.0 ppb |
| 2016-04-04 | 2134195008 HHA5 | 19.9 ppb |
| 2016-04-04 | 2134195009 HAA5 | 16.7 ppb |
| 2016-04-04 | 2134195010 HAA5 | 19.6 ppb |
| 2016-06-01 | 53.0 ppb* | |
| 2016-06-01 | 53.0 ppb* | |
| 2016-07-05 | 2156634001 | 21.7 ppb |
| 2016-07-05 | 2156634003 | 15.7 ppb |
| 2016-07-05 | 2156634004 | 39.2 ppb |
| 2016-07-05 | 2156634005 | 34.7 ppb |
| 2016-07-05 | 2156634006 | 57.3 ppb |
| 2016-07-05 | 2156634007 | 46.1 ppb |
| 2016-07-05 | 2156634008 | 36.3 ppb |
| 2016-07-05 | 2156634009 | 24.2 ppb |
| 2016-07-05 | 2156634010 | 44.3 ppb |
| 2016-10-03 | 2179446001 HAA5 | 11.5 ppb |
| 2016-10-03 | 2179446002 HAA5 | 9.90 ppb |
| 2016-10-03 | 2179446003 HAA5 | 32.2 ppb |
| 2016-10-03 | 2179446004 HAA5 | 31.0 ppb |
| 2016-10-03 | 2179446005 HAA5 | 79.4 ppb |
| 2016-10-03 | 2179446006 HAA5 | 36.3 ppb |
| 2016-10-03 | 2179446007 HAA5 | 39.0 ppb |
| 2016-10-03 | 2179446008 HAA5 | 19.6 ppb |
| 2016-10-03 | 2179446009 HAA5 | 43.0 ppb |
| 2017-01-04 | 2200080001 HAA5 | 14.2 ppb |
| 2017-01-04 | 2200080002 HAA5 | 23.0 ppb |
| 2017-01-04 | 2200080003 HAA5 | 23.4 ppb |
| 2017-01-04 | 2200080004 HAA5 | 20.8 ppb |
| 2017-01-04 | 2200080005 HAA5 | 21.3 ppb |
| 2017-01-04 | 2200080006 HAA5 | 38.1 ppb |
| 2017-01-04 | 2200080007 HAA5 | 20.3 ppb |
| 2017-01-04 | 2200080008 HAA5 | 21.0 ppb |
| 2017-01-04 | 2200080009 HAA5 | 22.5 ppb |
| 2017-04-04 | 2220361001 HAA5 | 11.8 ppb |
| 2017-04-04 | 2220361003 HAA5 | 33.1 ppb |
| 2017-04-04 | 2220361004 HAA5 | 30.2 ppb |
| 2017-04-04 | 2220361005 HAA5 | 24.5 ppb |
| 2017-04-04 | 2220361006 HAA5 | 23.2 ppb |
| 2017-04-04 | 2220361007 HAA5 | 47.3 ppb |
| 2017-04-04 | 2220361008 HAA5 | 27.9 ppb |
| 2017-04-04 | 2220361009 HAA5 | 33.3 ppb |
| 2017-04-04 | 2220361010 HAA5 | 37.6 ppb |
| 2017-04-05 | 2220361011 HAA5 | 27.7 ppb |
| 2017-07-18 | 2247510004 HAA5 | 11.8 ppb |
| 2017-07-18 | 2247510006 HAA5 | 63.3 ppb |
| 2017-07-18 | 2247510008 HAA5 | 73.9 ppb |
| 2017-07-18 | 2247510010 HAA5 | 64.1 ppb |
| 2017-07-18 | 2247510012 HAA5 | 57.1 ppb |
| 2017-07-18 | 2247510014 HAA5 | 55.5 ppb |
| 2017-07-18 | 2247510016 HAA5 | 44.4 ppb |
| 2017-07-18 | 2247510018 HAA5 | 64.3 ppb |
| 2017-10-03 | 2267296004 HAA5 | 13.6 ppb |
| 2017-10-03 | 2267296006 HAA5 | 53.8 ppb |
| 2017-10-03 | 2267296008 HAA5 | 45.7 ppb |
| 2017-10-03 | 2267296010 HAA5 | 42.8 ppb |
| 2017-10-03 | 2267296012 HAA5 | 58.4 ppb |
| 2017-10-03 | 2267296014 HAA5 | 37.5 ppb |
| 2017-10-03 | 2267296016 HAA4 | 24.7 ppb |
| 2017-10-03 | 2267296018 HHA5 | 52.6 ppb |
| 2018-01-03 | 2287060001 HAA5 | 28.9 ppb |
| 2018-01-03 | 2287060004 HAA5 | 46.3 ppb |
| 2018-01-03 | 2287060006 HAA5 | 48.5 ppb |
| 2018-01-03 | 2287060008 HAA5 | 37.2 ppb |
| 2018-01-03 | 2287060010 HAA5 | 31.0 ppb |
| 2018-01-03 | 2287060012 HAA5 | 34.8 ppb |
| 2018-01-03 | 2287060014 HAA5 | 22.6 ppb |
| 2018-01-03 | 2287060016 HAA5 | 43.0 ppb |
| 2018-01-03 | 2287060018 HAA5 | 48.3 ppb |
| 2018-04-03 | 2306959001 HAA5 | 26.1 ppb |
| 2018-04-03 | 2306959005 HAA5 | 13.5 ppb |
| 2018-04-03 | 2306959007 HAA5 | 26.7 ppb |
| 2018-04-03 | 2306959009 HAA5 | 25.3 ppb |
| 2018-04-03 | 2306959011 HAA5 | 23.6 ppb |
| 2018-04-03 | 2306959013 HAA5 | 32.9 ppb |
| 2018-04-03 | 2306959015 HAA5 | 22.0 ppb |
| 2018-04-03 | 2306959017 HAA5 | 20.3 ppb |
| 2018-07-02 | 2324450001 HAA5 | 25.1 ppb |
| 2018-07-02 | 2324450003 HAA5 | 16.7 ppb |
| 2018-07-02 | 2324450004 HAA5 | 43.9 ppb |
| 2018-07-02 | 2324450005 HAA5 | 33.7 ppb |
| 2018-07-02 | 2324450006 HAA5 | 33.7 ppb |
| 2018-07-02 | 2324450007 HAA5 | 38.5 ppb |
| 2018-07-02 | 2324450008 HAA5 | 33.6 ppb |
| 2018-07-02 | 2324450009 HAA5 | 28.2 ppb |
| 2018-07-02 | 2324450010 HAA5 | 36.9 ppb |
| 2018-10-02 | 2342141001 HAA5 | 19.0 ppb |
| 2018-10-02 | 2342141004 HAA5 | 30.4 ppb |
| 2018-10-02 | 2342141006 HAA5 | 32.2 ppb |
| 2018-10-02 | 2342141008 HAA5 | 31.3 ppb |
| 2018-10-02 | 2342141010 HAA5 | 38.6 ppb |
| 2018-10-02 | 2342141012 HAA5 | 51.4 ppb |
| 2018-10-02 | 2342141014 HAA5 | 30.8 ppb |
| 2018-10-02 | 2342141016 HAA5 | 26.1 ppb |
| 2018-10-02 | 2342141018 HAA5 | 38.3 ppb |
| 2019-01-03 | 3009447001 HAA5 | 10.4 ppb |
| 2019-01-03 | 3009447004 HAA5 | 27.3 ppb |
| 2019-01-03 | 3009447006 HAA5 | 19.0 ppb |
| 2019-01-03 | 3009447008 HAA5 | 17.8 ppb |
| 2019-01-03 | 3009447010 HAA5 | 19.8 ppb |
| 2019-01-03 | 3009447012 HAA5 | 38.9 ppb |
| 2019-01-03 | 3009447014 HAA5 | 20.3 ppb |
| 2019-01-03 | 3009447016 HAA5 | 30.0 ppb |
| 2019-01-03 | 3009447018 HAA5 | 24.4 ppb |
| 2019-01-03 | 3009447020 HAA5 | 15.4 ppb |
| 2019-04-02 | 3026194001 HAA5 | 10.1 ppb |
| 2019-04-02 | 3026194003 HAA5 | 19.5 ppb |
| 2019-04-02 | 3026194004 HAA5 | 16.8 ppb |
| 2019-04-02 | 3026194005 HAA5 | 16.1 ppb |
| 2019-04-02 | 3026194006 HAA5 | 14.5 ppb |
| 2019-04-02 | 3026194007 HAA5 | 14.4 ppb |
| 2019-04-02 | 3026194008 HAA5 | 15.7 ppb |
| 2019-04-02 | 3026194009 HAA5 | 18.9 ppb |
| 2019-04-02 | 3026194010 HAA5 | 20.0 ppb |
| 2019-04-02 | 3026194011 HAA5 | 9.80 ppb |
| 2019-07-01 | 3043203001 HAA5 | 22.4 ppb |
| 2019-07-01 | 3043203004 HAA5 | 17.2 ppb |
| 2019-07-01 | 3043203006 HAA5 | 34.0 ppb |
| 2019-07-01 | 3043203008 HAA5 | 30.5 ppb |
| 2019-07-01 | 3043203010 HAA4 | 36.1 ppb |
| 2019-07-01 | 3043203012 HAA5 | 33.4 ppb |
| 2019-07-01 | 3043203014 HAA5 | 27.3 ppb |
| 2019-07-01 | 3043203016 HAA5 | 28.2 ppb |
| 2019-07-01 | 3043203018 HAA5 | 33.4 ppb |
| 2019-07-01 | 3043203020 HAA5 | 23.1 ppb |
| 2019-10-02 | 3061934001 HAA5 | 17.1 ppb |
| 2019-10-02 | 3061934004 HAA5 | 22.3 ppb |
| 2019-10-02 | 3061934006 HAA5 | 34.0 ppb |
| 2019-10-02 | 3061934008 HAA5 | 29.6 ppb |
| 2019-10-02 | 3061934010 HAA5 | 30.5 ppb |
| 2019-10-02 | 3061934012 HAA5 | 33.8 ppb |
| 2019-10-02 | 3061934014 HAA5 | 23.6 ppb |
| 2019-10-02 | 3061934016 HAA5 | 17.4 ppb |
| 2019-10-02 | 3061934018 HAA5 | 35.1 ppb |
| 2019-10-02 | 3061934020 HAA5 | 15.0 ppb |
* Sample result is taken from the system's CCR report.