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EWG's Tap Water Database — 2019 UPDATE

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Total trihalomethanes (TTHMs)

Tifton-Tift County Water System

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.

In 2010, the California Office of Environmental Health Hazard Assessment published a draft public health goal for the trihalomethanes group at 0.8 parts per billion, or 100 times lower than the federal legal limit of 80 parts per billion for this contaminant group.

Click here to read more about disinfection byproducts.

 

78

Samples

0

Samples exceeding legal limit (MCL)

35

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20125.35 ppb444.00 ppb - 7.20 ppb
20137.36 ppb105ND - 54.5 ppb
20142.41 ppb167ND - 7.80 ppb
20152.29 ppb169ND - 8.40 ppb
20161.20 ppb164ND - 5.60 ppb
20170.869 ppb166ND - 4.60 ppb

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 Lab ID Result
2012-01-30AH523184.40 ppb
2012-05-07AH582245.80 ppb
2012-08-14AH742727.20 ppb
2012-10-15AH819494.00 ppb
2013-01-22AH876865.90 ppb
2013-05-07AI0078454.5 ppb
2013-08-19AI12091ND
2013-08-19AI12092ND
2013-08-19AI12093ND
2013-08-19AI120944.60 ppb
2013-11-25AI23550ND
2013-11-25AI23551ND
2013-11-25AI235524.30 ppb
2013-11-25AI235534.30 ppb
2014-02-24AI285495.80 ppb
2014-02-24AI285486.70 ppb
2014-02-24AI28547ND
2014-02-24AI28546ND
2014-05-27AI414536.00 ppb
2014-05-27AI41450ND
2014-05-27AI41451ND
2014-05-27AI414527.80 ppb
2014-08-26AI514583.60 ppb
2014-08-26AI514573.40 ppb
2014-08-26AI51456ND
2014-08-26AI51455ND
2014-11-24AI60119ND
2014-11-24AI60120ND
2014-11-24AI60121ND
2014-11-24AI601225.20 ppb
2015-02-23AI65303ND
2015-02-23AI65304ND
2015-02-23AI653056.00 ppb
2015-02-23AI653063.60 ppb
2015-05-26AI780604.20 ppb
2015-05-26AI780593.70 ppb
2015-05-26AI78058ND
2015-05-26AI78057ND
2015-08-24AI874478.40 ppb
2015-08-24AI874461.10 ppb
2015-08-24AI874451.30 ppb
2015-08-24AI874443.10 ppb
2015-11-23AJ015705.30 ppb
2015-11-23AJ01569ND
2015-11-23AJ01568ND
2015-11-23AJ01567ND
2016-02-22AJ06847ND
2016-02-22AJ06849ND
2016-02-22AJ06848ND
2016-02-22AJ068505.60 ppb
2016-05-23AJ127403.90 ppb
2016-05-23AJ12739ND
2016-05-23AJ12738ND
2016-05-23AJ12737ND
2016-08-23AJ23756ND
2016-08-23AJ23757ND
2016-08-23AJ23758ND
2016-08-23AJ237594.80 ppb
2016-11-21AJ33977ND
2016-11-21AJ33978ND
2016-11-21AJ33979ND
2016-11-21AJ339804.90 ppb
2017-02-20AJ467334.60 ppb
2017-02-20AJ46732ND
2017-02-20AJ467311.20 ppb
2017-02-20AJ467301.30 ppb
2017-05-23AJ55991ND
2017-05-23AJ559921.20 ppb
2017-05-23AJ55993ND
2017-05-23AJ559943.90 ppb
2017-08-22AJ65335ND
2017-08-22AJ653361.70 ppb
2017-08-22AJ65337ND
2017-08-22AJ65338ND
2017-11-20AJ74083ND
2017-11-20AJ74082ND
2017-11-20AJ74081ND
2017-11-20AJ74080ND