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EWG's Tap Water Database — 2019 UPDATE

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Haloacetic acids (HAA5)

Jefferson County PWSD 10

NOTE: Jefferson County PWSD 10 purchases water from Missouri American St. Louis County & St. Charles County which is required to test for haloacetic acids (haa5). Sample information shown below was taken by Missouri American St. Louis County & St. Charles County.

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.

 

442

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201239.5 ppb6618.9 ppb - 70.7 ppb
201329.7 ppb8816.9 ppb - 45.5 ppb
201422.0 ppb87ND - 34.7 ppb
201526.2 ppb8813.1 ppb - 40.0 ppb
201627.6 ppb8813.8 ppb - 50.3 ppb
201712.0 ppb85ND - 31.2 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

NOTE: Jefferson County PWSD 10 purchases water from Missouri American St. Louis County & St. Charles County which is required to test for haloacetic acids (haa5). Sample information shown below was taken by Missouri American St. Louis County & St. Charles County.

Date Lab ID Result
2012-01-051558540131.4 ppb
2012-01-051558550131.0 ppb
2012-01-051558560121.6 ppb
2012-01-05155871019.00 ppb
2012-01-051559260135.4 ppb
2012-01-051559520113.5 ppb
2012-01-051582410116.1 ppb
2012-01-051582520121.4 ppb
2012-01-051582570116.6 ppb
2012-01-051582580119.9 ppb
2012-01-051582590123.0 ppb
2012-01-051582600127.8 ppb
2012-01-051582610113.1 ppb
2012-01-051582620119.1 ppb
2012-01-051582760111.1 ppb
2012-01-051582870124.4 ppb
2012-01-051616000118.8 ppb
2012-01-051616010119.4 ppb
2012-01-051616020119.0 ppb
2012-01-051616190117.4 ppb
2012-01-051616200115.7 ppb
2012-01-051616210116.9 ppb
2012-01-051616220116.8 ppb
2012-05-081611470124.7 ppb
2012-05-081611490125.6 ppb
2012-05-081611550128.0 ppb
2012-05-081642020113.3 ppb
2012-05-081712980126.4 ppb
2012-05-081713000129.0 ppb
2012-05-081713020122.7 ppb
2012-05-081713040122.2 ppb
2012-05-081713060116.6 ppb
2012-05-081713080112.2 ppb
2012-05-081713210115.9 ppb
2012-05-081713240115.7 ppb
2012-05-081713300111.7 ppb
2012-05-081713320112.5 ppb
2012-05-081713340115.6 ppb
2012-05-081713360113.4 ppb
2012-05-081713380115.4 ppb
2012-05-081717550115.9 ppb
2012-05-081740620111.6 ppb
2012-05-081740800111.3 ppb
2012-05-081852760120.9 ppb
2012-08-01182877019.60 ppb
2012-08-01182878019.70 ppb
2012-08-011828790110.7 ppb
2012-08-011828810111.1 ppb
2012-08-01182882018.20 ppb
2012-08-011828830114.3 ppb
2012-08-011828860133.2 ppb
2012-08-011828870132.6 ppb
2012-08-011828880131.6 ppb
2012-08-011828890129.1 ppb
2012-08-011828900127.2 ppb
2012-08-011828970127.6 ppb
2012-08-011828980138.7 ppb
2012-08-011828990134.1 ppb
2012-08-011829000121.7 ppb
2012-08-011829030110.3 ppb
2012-08-01182904018.50 ppb
2012-08-01182905019.70 ppb
2012-08-01182906017.10 ppb
2012-08-011937680124.4 ppb
2012-08-071966440110.00 ppb
2012-11-052015640118.1 ppb
2012-11-052015650114.3 ppb
2012-11-052015660112.9 ppb
2012-11-052015670115.5 ppb
2012-11-052015700111.4 ppb
2012-11-052015710115.4 ppb
2012-11-052015720110.6 ppb
2012-11-052015730111.5 ppb
2012-11-052015740112.5 ppb
2012-11-05201577019.40 ppb
2012-11-052015780127.8 ppb
2012-11-052015790123.6 ppb
2012-11-052015800112.7 ppb
2012-11-052015850121.7 ppb
2012-11-052015860111.4 ppb
2012-11-05201587014.70 ppb
2012-11-052015880118.9 ppb
2012-11-052015890115.5 ppb
2012-11-052015900114.0 ppb
2012-11-052015970111.1 ppb
2012-11-052016000121.8 ppb
2013-02-112101580119.2 ppb
2013-02-112101600116.2 ppb
2013-02-112101610117.8 ppb
2013-02-112101620120.8 ppb
2013-02-112101670114.6 ppb
2013-02-112101680121.5 ppb
2013-02-112101690116.6 ppb
2013-02-112101710117.5 ppb
2013-02-112101720114.3 ppb
2013-02-112101770112.9 ppb
2013-02-112101780128.9 ppb
2013-02-112101790127.6 ppb
2013-02-112101800136.0 ppb
2013-02-112101900120.4 ppb
2013-02-112101910114.6 ppb
2013-02-112101920113.1 ppb
2013-02-112101940111.8 ppb
2013-02-112101960112.4 ppb
2013-02-112101970115.3 ppb
2013-02-11210206016.00 ppb
2013-02-112102080120.8 ppb
2013-05-222179680122.3 ppb
2013-05-222179690125.1 ppb
2013-05-222179720119.3 ppb
2013-05-222179730123.5 ppb
2013-05-222179780121.1 ppb
2013-05-222179790117.7 ppb
2013-05-222179800119.9 ppb
2013-05-222179820117.9 ppb
2013-05-222179830120.8 ppb
2013-05-222179880116.9 ppb
2013-05-222179890114.2 ppb
2013-05-222179900111.4 ppb
2013-05-222179910113.7 ppb
2013-05-222180010110.7 ppb
2013-05-222180020127.2 ppb
2013-05-222180030124.4 ppb
2013-05-222180050122.3 ppb
2013-05-222180070126.7 ppb
2013-05-222180080121.0 ppb
2013-05-222180180111.4 ppb
2013-05-222180200115.6 ppb
2013-08-072317030122.0 ppb
2013-08-072317040117.5 ppb
2013-08-072317060118.2 ppb
2013-08-072317070119.3 ppb
2013-08-072317120115.6 ppb
2013-08-072317130117.2 ppb
2013-08-072317140115.2 ppb
2013-08-072317160116.3 ppb
2013-08-072317170116.8 ppb
2013-08-072317220113.9 ppb
2013-08-072317230110.3 ppb
2013-08-072317240113.0 ppb
2013-08-072317250114.9 ppb
2013-08-072317350110.9 ppb
2013-08-07231736018.90 ppb
2013-08-07231737018.40 ppb
2013-08-072317390113.0 ppb
2013-08-072317410110.8 ppb
2013-08-07231742019.30 ppb
2013-08-072317510112.3 ppb
2013-08-072317530111.8 ppb
2013-11-062393090111.4 ppb
2013-11-06239310019.70 ppb
2013-11-062393130117.5 ppb
2013-11-062393140110.3 ppb
2013-11-06239319018.50 ppb
2013-11-062393200110.3 ppb
2013-11-062393210114.9 ppb
2013-11-06239323017.60 ppb
2013-11-06239324015.50 ppb
2013-11-06239329017.80 ppb
2013-11-06239330014.80 ppb
2013-11-06239331014.60 ppb
2013-11-06239332014.90 ppb
2013-11-06239342013.80 ppb
2013-11-06239343016.40 ppb
2013-11-06239344016.70 ppb
2013-11-06239346018.10 ppb
2013-11-06239348018.00 ppb
2013-11-06239349015.50 ppb
2013-11-06239358014.90 ppb
2013-11-06239360015.00 ppb
2014-02-19246906019.10 ppb
2014-02-19246907019.30 ppb
2014-02-192469090110.6 ppb
2014-02-19246910019.50 ppb
2014-02-19246914016.50 ppb
2014-02-19246915014.60 ppb
2014-02-19246916015.90 ppb
2014-02-192469170112.2 ppb
2014-02-192469210119.4 ppb
2014-02-192469220119.5 ppb
2014-02-192469230119.5 ppb
2014-02-192469310117.7 ppb
2014-02-192469320117.6 ppb
2014-02-192469330117.6 ppb
2014-02-192469340123.1 ppb
2014-02-192469350119.1 ppb
2014-05-142559160122.3 ppb
2014-05-142559170122.9 ppb
2014-05-142559190119.9 ppb
2014-05-142559200126.3 ppb
2014-05-142559240118.4 ppb
2014-05-142559250118.0 ppb
2014-05-142559260116.7 ppb
2014-05-142559270111.2 ppb
2014-05-14255931019.70 ppb
2014-05-142559320110.7 ppb
2014-05-142559330112.7 ppb
2014-05-142559410111.5 ppb
2014-05-142559420112.3 ppb
2014-05-142559430119.1 ppb
2014-05-142559440116.8 ppb
2014-05-142559450112.7 ppb
2014-08-192654730126.9 ppb
2014-08-192654740119.8 ppb
2014-08-192654760123.1 ppb
2014-08-192654770121.6 ppb
2014-08-192654810118.0 ppb
2014-08-192654820116.6 ppb
2014-08-192654830116.1 ppb
2014-08-192654840116.4 ppb
2014-08-192654880114.7 ppb
2014-08-192654890114.7 ppb
2014-08-192654900114.7 ppb
2014-08-19265498018.20 ppb
2014-08-19265499019.40 ppb
2014-08-192655000110.2 ppb
2014-08-192655010116.0 ppb
2014-08-19265502019.90 ppb
2014-08-19AC3093426.7 ppb
2014-08-19AC3093522.0 ppb
2014-08-19AC3093620.5 ppb
2014-08-19AC3093726.8 ppb
2014-08-19AC3093827.0 ppb
2014-08-19AC3093921.9 ppb
2014-08-19AC3094028.8 ppb
2014-08-19AC3094121.5 ppb
2014-08-19AC3094224.4 ppb
2014-08-19AC3094315.0 ppb
2014-08-19AC3094421.4 ppb
2014-08-19AC3094523.0 ppb
2014-08-19AC3094614.7 ppb
2014-08-19AC3094722.7 ppb
2014-08-19AC3094815.5 ppb
2014-08-19AC3094914.6 ppb
2014-11-062737980115.3 ppb
2014-11-062737990116.2 ppb
2014-11-062738010118.1 ppb
2014-11-062738020116.6 ppb
2014-11-062738060116.0 ppb
2014-11-062738070112.5 ppb
2014-11-062738080110.4 ppb
2014-11-062738090113.5 ppb
2014-11-06273813019.20 ppb
2014-11-062738140114.8 ppb
2014-11-062738150120.9 ppb
2014-11-062738230111.0 ppb
2014-11-06273824017.00 ppb
2014-11-06273825018.50 ppb
2014-11-062738260111.3 ppb
2014-11-06273827019.10 ppb
2015-02-122815290111.3 ppb
2015-02-122815330110.9 ppb
2015-02-12281538017.80 ppb
2015-02-122815440119.5 ppb
2015-02-122815580116.5 ppb
2015-02-122815300114.4 ppb
2015-02-122815320111.4 ppb
2015-02-12281537019.10 ppb
2015-02-12281539019.80 ppb
2015-02-122815400110.8 ppb
2015-02-122815450119.5 ppb
2015-02-122815460130.5 ppb
2015-02-122815540117.2 ppb
2015-02-122815550119.2 ppb
2015-02-122815560117.0 ppb
2015-02-122815570116.1 ppb
2015-05-122888420122.7 ppb
2015-05-122888450122.2 ppb
2015-05-122888500114.6 ppb
2015-05-122888510121.6 ppb
2015-05-12288859019.00 ppb
2015-05-122888700110.4 ppb
2015-05-122888710110.4 ppb
2015-05-122888720114.2 ppb
2015-05-122888410127.2 ppb
2015-05-122888440125.4 ppb
2015-05-122888520116.2 ppb
2015-05-122888530110.4 ppb
2015-05-12288858017.20 ppb
2015-05-122888600111.1 ppb
2015-05-122888690110.9 ppb
2015-05-122888730110.4 ppb
2015-08-252980100130.5 ppb
2015-08-252980210134.6 ppb
2015-08-252980370117.7 ppb
2015-08-252980390119.2 ppb
2015-08-252980410117.9 ppb
2015-08-252980090146.6 ppb
2015-08-252980120132.9 ppb
2015-08-252980130137.9 ppb
2015-08-252980180137.7 ppb
2015-08-252980190125.8 ppb
2015-08-252980200133.0 ppb
2015-08-252980260112.0 ppb
2015-08-252980270113.5 ppb
2015-08-252980280119.1 ppb
2015-08-252980380116.2 ppb
2015-08-252980400122.1 ppb
2015-11-123064660115.3 ppb
2015-11-123064670114.2 ppb
2015-11-123064690115.5 ppb
2015-11-123064700117.2 ppb
2015-11-123064750112.4 ppb
2015-11-123064830125.2 ppb
2015-11-123064840123.3 ppb
2015-11-123064850128.0 ppb
2015-11-123064940111.9 ppb
2015-11-123064950115.4 ppb
2015-11-123064960112.4 ppb
2015-11-123064970113.0 ppb
2015-11-12306498018.30 ppb
2015-11-12306476019.60 ppb
2015-11-123064770111.3 ppb
2015-11-12306478016.80 ppb
2016-02-16312629018.80 ppb
2016-02-16312635015.40 ppb
2016-02-16312636018.00 ppb
2016-02-163126370112.5 ppb
2016-02-16312657017.70 ppb
2016-02-16312625016.00 ppb
2016-02-16312626017.70 ppb
2016-02-16312628017.10 ppb
2016-02-16312634015.40 ppb
2016-02-163126420126.9 ppb
2016-02-163126530110.2 ppb
2016-02-163126540112.9 ppb
2016-02-163126550111.2 ppb
2016-02-163126560111.3 ppb
2016-02-253158060125.4 ppb
2016-02-253158070126.2 ppb
2016-05-173196370151.9 ppb
2016-05-173196420154.3 ppb
2016-05-173196430139.9 ppb
2016-05-173196520120.0 ppb
2016-05-173196620112.7 ppb
2016-05-173196650115.9 ppb
2016-05-173196330144.7 ppb
2016-05-173196340153.3 ppb
2016-05-173196360137.3 ppb
2016-05-173196440139.2 ppb
2016-05-173196450122.9 ppb
2016-05-173196500115.7 ppb
2016-05-173196510118.9 ppb
2016-05-173196610112.9 ppb
2016-05-173196630112.7 ppb
2016-05-173196640113.5 ppb
2016-08-163301680130.3 ppb
2016-08-163301780123.2 ppb
2016-08-163301840118.6 ppb
2016-08-163301960118.2 ppb
2016-08-163301970120.1 ppb
2016-08-163301670152.5 ppb
2016-08-163301700135.6 ppb
2016-08-163301710133.3 ppb
2016-08-163301760132.6 ppb
2016-08-163301770124.1 ppb
2016-08-163301790121.9 ppb
2016-08-163301850123.3 ppb
2016-08-163301860117.9 ppb
2016-08-163301950118.6 ppb
2016-08-163301980125.5 ppb
2016-08-163301990120.9 ppb
2016-11-103370320121.0 ppb
2016-11-103370400115.6 ppb
2016-11-103370490111.8 ppb
2016-11-103370600110.2 ppb
2016-11-10337063019.60 ppb
2016-11-103370340118.8 ppb
2016-11-103370350115.4 ppb
2016-11-103370410112.5 ppb
2016-11-103370420114.5 ppb
2016-11-103370430111.6 ppb
2016-11-10337048018.10 ppb
2016-11-103370500111.9 ppb
2016-11-103370590114.4 ppb
2016-11-103370610128.1 ppb
2016-11-103370620114.3 ppb
2016-11-103370310114.9 ppb
2017-02-023456650112.0 ppb
2017-02-023456700113.6 ppb
2017-02-02345671019.70 ppb
2017-02-023456790128.0 ppb
2017-02-023456890127.2 ppb
2017-02-023456900133.3 ppb
2017-02-023456610116.3 ppb
2017-02-023456620113.2 ppb
2017-02-023456640112.7 ppb
2017-02-023456720110.00 ppb
2017-02-023456730111.6 ppb
2017-02-023456780134.3 ppb
2017-02-023456910121.3 ppb
2017-02-023456920119.2 ppb
2017-02-023456930128.0 ppb
2017-02-163495430111.5 ppb
2017-05-253540280123.7 ppb
2017-05-253540330127.6 ppb
2017-05-253540340127.9 ppb
2017-05-253540360117.9 ppb
2017-05-253540410118.8 ppb
2017-05-253540530116.4 ppb
2017-05-253540540116.1 ppb
2017-05-253540580119.3 ppb
2017-05-253540240122.4 ppb
2017-05-253540250128.2 ppb
2017-05-253540270125.7 ppb
2017-05-253540350128.1 ppb
2017-05-253540420116.4 ppb
2017-05-253540430119.5 ppb
2017-05-253540550123.1 ppb
2017-05-253540560121.2 ppb
2017-08-173657220121.3 ppb
2017-08-173657300120.0 ppb
2017-08-173657320117.0 ppb
2017-08-173657390115.2 ppb
2017-08-17365747019.10 ppb
2017-08-173657490115.6 ppb
2017-08-173657500114.8 ppb
2017-08-173657510111.9 ppb
2017-08-173657230118.7 ppb
2017-08-173657250119.2 ppb
2017-08-173657260119.6 ppb
2017-08-173657310114.4 ppb
2017-08-173657330111.8 ppb
2017-08-173657370112.4 ppb
2017-08-173657380115.4 ppb
2017-08-17365748019.50 ppb
2017-11-093766080114.1 ppb
2017-11-093766090114.3 ppb
2017-11-093766140111.3 ppb
2017-11-093766160113.9 ppb
2017-11-093766210116.1 ppb
2017-11-093766220114.7 ppb
2017-11-093766320117.7 ppb
2017-11-093766050110.8 ppb
2017-11-093766060113.8 ppb
2017-11-093766130113.1 ppb
2017-11-093766150111.9 ppb
2017-11-093766200120.8 ppb
2017-11-09376630019.10 ppb
2017-11-093766310112.0 ppb
2017-11-093766330116.2 ppb
2017-11-09376634018.60 ppb