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EWG's Tap Water Database — 2019 UPDATE

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Haloacetic acids (HAA5)

City of Ripon

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.

 

65

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013ND40ND
2014ND120ND
2015ND170ND
20160.0938 ppb161ND - 1.50 ppb
20170.550 ppb166ND - 2.10 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 on-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
2013-11-052625-901-0938ND
2013-11-052625-900-0850ND
2013-11-052625-902-0950ND
2013-11-052625-903-1050ND
2014-02-052625-901-1115ND
2014-02-052625-900-1006ND
2014-02-052625-902-1140ND
2014-02-052625-903-1027ND
2014-05-072625-902-1408ND
2014-05-072625-900-1334ND
2014-05-072625-903-1311ND
2014-05-072625-901-1352ND
2014-08-112625-903-0916ND
2014-08-112625-902-1100ND
2014-08-112625-901-1047ND
2014-08-112625-900-0951ND
2015-02-182625-902-1047ND
2015-02-182625-903-0958ND
2015-02-182625-900-1017ND
2015-02-202625-901-1006ND
2015-05-052625-900-0910ND
2015-05-052625-901-0945ND
2015-05-052625-903-0925ND
2015-05-052625-902-1000ND
2015-08-052625-902-1000ND
2015-08-052625-900-0900ND
2015-08-052625-903-0915ND
2015-08-052625-901-0935ND
2015-11-032625-903-0920ND
2015-11-032625-903-0945ND
2015-11-032625-901-1015ND
2015-11-032625-902-1045ND
2015-11-032625-900-0945ND
2016-02-112625-901-1020ND
2016-02-112625-903-1055ND
2016-02-112625-902-0910ND
2016-02-112625-900-1035ND
2016-05-032625-901-1415ND
2016-05-032625-900-1445ND
2016-05-032625-902-1400ND
2016-05-032625-903-1430ND
2016-08-032625-901-1400ND
2016-08-032625-903-1410ND
2016-08-032625-902-1345ND
2016-08-032625-900-1420ND
2016-11-022625-902-0845ND
2016-11-022625-901-08301.50 ppb
2016-11-022625-900-0815ND
2016-11-022625-903-0900ND
2017-02-022625-901-11201.000 ppb
2017-02-022625-903-11101.20 ppb
2017-02-022625-900-10471.30 ppb
2017-02-022625-902-11341.40 ppb
2017-05-172625-901-0950ND
2017-05-172625-903-0917ND
2017-05-172625-902-1015ND
2017-05-172625-900-0856ND
2017-08-012625-900-0835ND
2017-08-012625-903-0905ND
2017-08-012625-901-1022ND
2017-08-012625-902-0958ND
2017-11-152625-900-1305ND
2017-11-152625-901-14102.10 ppb
2017-11-152625-902-13501.80 ppb
2017-11-152625-903-1325ND