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EWG's Tap Water Database — 2019 UPDATE

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Total trihalomethanes (TTHMs)

Cooper City

Trihalomethanes are cancer-causing contaminants that form during water treatment with chlorine and other disinfectants. The total trihalomethanes group includes four chemicals: chloroform, bromodichloromethane, dibromochloromethane and bromoform. Read More.

Studies conducted in the U.S. and Europe have found that drinking tap water that carries disinfection byproducts increases the risk of developing bladder cancer. In animal studies, all trihalomethanes cause liver, kidney and intestinal tumors. Some human epidemiological studies also reported an association between disinfection byproducts and an increased risk of problems during pregnancy, including spontaneous miscarriage, cardiovascular defects, neural tube defects and low birth weight.

The health guideline of 0.15 parts per billion, or ppb, for the group of four trihalomethanes, or THM4/TTHM, was defined in a peer-reviewed scientific study by EWG and represents a one-in-one-million lifetime cancer risk level.

Click here to read more about disinfection byproducts.

 

76

Samples

0

Samples exceeding legal limit (MCL)

37

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
20130.143 ppb74ND - 0.250 ppb
20140.250 ppb16160.250 ppb
20150.188 ppb1612ND - 0.250 ppb
20160.141 ppb165ND - 1.20 ppb
2017ND170ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.15 ppb

The health guideline of 0.15 parts per billion, or ppb, for the group of four trihalomethanes, or THM4/TTHM, was defined in a peer-reviewed scientific study by EWG and represents a one-in-one-million lifetime cancer risk level.

EPA Maximum Contaminant
Level (MCL) 80 ppb

The legal limit for the group of four trihalomethanes, 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 due to exposure to trihalomethanes.

ppb = parts per billion

All test results

Date Result
2012-02-15ND
2012-05-16ND
2012-08-07ND
2012-11-13ND
2013-02-20ND
2013-05-15ND
2013-08-08ND
2013-11-120.250 ppb
2013-11-120.250 ppb
2013-11-120.250 ppb
2013-11-120.250 ppb
2014-02-120.250 ppb
2014-02-120.250 ppb
2014-02-120.250 ppb
2014-02-120.250 ppb
2014-05-060.250 ppb
2014-05-060.250 ppb
2014-05-060.250 ppb
2014-05-060.250 ppb
2014-08-130.250 ppb
2014-08-130.250 ppb
2014-08-130.250 ppb
2014-08-130.250 ppb
2014-11-130.250 ppb
2014-11-130.250 ppb
2014-11-130.250 ppb
2014-11-130.250 ppb
2015-02-050.250 ppb
2015-02-050.250 ppb
2015-02-050.250 ppb
2015-02-050.250 ppb
2015-05-140.250 ppb
2015-05-140.250 ppb
2015-05-140.250 ppb
2015-05-140.250 ppb
2015-08-06ND
2015-08-06ND
2015-08-06ND
2015-08-06ND
2015-11-030.250 ppb
2015-11-030.250 ppb
2015-11-030.250 ppb
2015-11-030.250 ppb
2016-02-09ND
2016-02-09ND
2016-02-09ND
2016-02-09ND
2016-05-10ND
2016-05-10ND
2016-05-10ND
2016-05-10ND
2016-08-17ND
2016-08-17ND
2016-08-170.300 ppb
2016-08-17ND
2016-11-031.20 ppb
2016-11-030.250 ppb
2016-11-030.250 ppb
2016-11-030.250 ppb
2017-02-02ND
2017-02-02ND
2017-02-02ND
2017-02-02ND
2017-05-04ND
2017-05-04ND
2017-05-04ND
2017-05-04ND
2017-08-01ND
2017-08-01ND
2017-08-01ND
2017-08-01ND
2017-09-05ND
2017-11-02ND
2017-11-02ND
2017-11-02ND
2017-11-02ND