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EWG's Tap Water Database — 2019 UPDATE

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Total trihalomethanes (TTHMs)

City of North Platte

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.

 

39

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013ND50ND
2014ND120ND
2015ND50ND
2016ND40ND
2017ND80ND

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
2012-03-20152795ND
2012-04-23166098ND
2012-04-23166099ND
2012-10-30204680ND
2012-12-12209286ND
2013-02-27215114ND
2013-05-13230208ND
2013-05-13230207ND
2013-06-05230412ND
2013-10-29265563ND
2014-02-12278459ND
2014-03-19279093ND
2014-05-19294427ND
2014-05-19294426ND
2014-06-11294429ND
2014-06-11294434ND
2014-06-11294433ND
2014-06-11294432ND
2014-06-11294431ND
2014-06-11294428ND
2014-06-11294430ND
2014-11-19328562ND
2015-01-26343308ND
2015-04-22353626ND
2015-04-22353627ND
2015-10-28391765ND
2015-12-08391766ND
2016-06-02ND
2016-06-02ND
2016-06-08ND
2016-10-25ND
2017-05-09ND
2017-05-09ND
2017-06-21ND
2017-06-21ND
2017-06-21ND
2017-06-21ND
2017-06-21ND
2017-10-02ND