EWG's Tap Water Database — 2019 UPDATE


Total trihalomethanes (TTHMs)

Syracuse 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.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
201226.4 ppb28289.50 ppb - 48.0 ppb
201325.4 ppb202010.00 ppb - 56.0 ppb
201429.8 ppb161614.0 ppb - 52.0 ppb
201531.8 ppb161618.0 ppb - 45.0 ppb
201632.1 ppb161617.0 ppb - 47.0 ppb
201734.4 ppb161619.0 ppb - 64.0 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
2012-02-161Q2012 COLEMAN F20.0 ppb
2012-02-161Q2012 WATER SHO16.0 ppb
2012-02-161Q2012 WESTCOTT9.50 ppb
2012-02-161Q2012 NOTTINGHA22.0 ppb
2012-05-082Q2012 CANON TRA26.0 ppb
2012-05-082Q2012 COLEMAN F26.0 ppb
2012-05-082Q2012 WOODLAND21.0 ppb
2012-05-082Q2012 MUZAK COR31.0 ppb
2012-05-082Q2012 MCCHESNEY35.0 ppb
2012-05-082Q2012 NOTTINGHA21.0 ppb
2012-05-082Q2012 WESTCOTT23.0 ppb
2012-05-082Q2012 WATER SHO26.0 ppb
2012-08-143Q2012 MCCHESNEY48.0 ppb
2012-08-143Q2012 NOTTINGHA34.0 ppb
2012-08-143Q2012 MUZAK COR44.0 ppb
2012-08-143Q2012 COLEMAN F43.0 ppb
2012-08-143Q2012 CANON TRA46.0 ppb
2012-08-143Q2012 WOODLAND42.0 ppb
2012-08-143Q2012 WESTCOTT25.0 ppb
2012-08-143Q2012 WATER SHO44.0 ppb
2012-11-134Q2012 WESTCOTT10.3 ppb
2012-11-134Q2012 MCCHESNEY22.0 ppb
2012-11-134Q2012 COLEMAN F18.0 ppb
2012-11-134Q2012 MUZAK COR22.0 ppb
2012-11-134Q2012 WOODLAND11.4 ppb
2012-11-134Q2012 WATER SHO18.0 ppb
2012-11-134Q2012 CANON TRA22.0 ppb
2012-11-134Q2012 NOTTINGHA14.1 ppb
2013-02-121Q2013 WATER SHO15.2 ppb
2013-02-121Q2013 WOODLAND12.1 ppb
2013-02-121Q2013 WESTCOTT10.00 ppb
2013-02-121Q2013 MCCHESNEY16.0 ppb
2013-02-121Q2013 CANON TRA16.0 ppb
2013-02-121Q2013 NOTTINGHA16.0 ppb
2013-02-121Q2013 COLEMAN F14.9 ppb
2013-02-121Q2013 MUZAK COR16.0 ppb
2013-05-142Q2013 COLEMAN F18.0 ppb
2013-05-142Q2013 MCCHESNEY21.0 ppb
2013-05-142Q2013 MUZAK COR25.0 ppb
2013-05-142Q2013 CANON TRA22.0 ppb
2013-08-133Q2013 MUZAK COR46.0 ppb
2013-08-133Q2013 MCCHESNEY51.0 ppb
2013-08-133Q2013 CANON TRA56.0 ppb
2013-08-133Q2013 COLEMAN F43.0 ppb
2013-11-134Q2013 MCCHESNEY27.0 ppb
2013-11-134Q2013 COLEMAN F25.0 ppb
2013-11-134Q2013 MUZAK COR27.0 ppb
2013-11-134Q2013 CANNON TR31.0 ppb
2014-02-111Q2014 COLEMAN F18.0 ppb
2014-02-111Q2014 MAMA NANC14.0 ppb
2014-02-111Q2014 MCCHESNEY14.4 ppb
2014-02-111Q2014 MUZAK COR18.0 ppb
2014-05-132Q2014 MCCHESNEY23.0 ppb
2014-05-132Q2014 MUZAK COR26.0 ppb
2014-05-132Q2014 COLEMAN F25.0 ppb
2014-05-132Q2014 CANNON TR22.0 ppb
2014-08-123Q2014 COLEMAN F48.0 ppb
2014-08-123Q2014 MCCHESNEY50.0 ppb
2014-08-123Q2014 MUZAK COR45.0 ppb
2014-08-123Q2014 MAMA NANC52.0 ppb
2014-11-124Q2014 MCCHESNEY31.0 ppb
2014-11-124Q2014 COLEMAN F31.0 ppb
2014-11-124Q2014 MAMA NANC31.0 ppb
2014-11-124Q2014 MUZAK COR29.0 ppb
2015-02-111Q2015 MUZAK COR25.0 ppb
2015-02-111Q2015 COLEMAN F20.0 ppb
2015-02-111Q2015 MCCHESNEY21.0 ppb
2015-02-111Q2015 MAMA NANC18.0 ppb
2015-05-132Q2015 MCCHESNEY27.0 ppb
2015-05-132Q2015 MUZAK COR40.0 ppb
2015-05-132Q2015 MAMA NANC24.0 ppb
2015-05-132Q2015 COLEMAN F31.0 ppb
2015-08-113Q2015 COLEMAN F44.0 ppb
2015-08-113Q2015 MUZAK COR45.0 ppb
2015-08-113Q2015 MCCHESNEY42.0 ppb
2015-08-113Q2015 MAMA NANC43.0 ppb
2015-11-094Q2015 COLEMAN F34.0 ppb
2015-11-094Q2015 MUZAK COR37.0 ppb
2015-11-094Q2015 MAMA NANC27.0 ppb
2015-11-094Q2015 MCCHESNEY30.0 ppb
2016-02-091Q2016 COLEMAN F17.0 ppb
2016-02-091Q2016 MUZAK COR18.0 ppb
2016-02-091Q2016 MCCHESNEY17.0 ppb
2016-02-091Q2016 MAMA NANC17.0 ppb
2016-05-102Q2016 MUZAK COR26.0 ppb
2016-05-102Q2016 COLEMAN F24.0 ppb
2016-05-102Q2016 MAMA NANC26.0 ppb
2016-05-102Q2016 MCCHESNEY23.0 ppb
2016-08-113Q2016 MCCHESNEY45.0 ppb
2016-08-113Q2016 MUZAK COR45.0 ppb
2016-08-113Q2016 COLEMAN F45.0 ppb
2016-08-113Q2016 MAMA NANC47.0 ppb
2016-11-164Q2016 MUZAK COR38.0 ppb
2016-11-164Q2016 MCCHESNEY43.0 ppb
2016-11-164Q2016 MAMA NANC44.0 ppb
2016-11-164Q2016 COLEMAN F39.0 ppb
2017-02-161Q2017 MUZAK COR21.0 ppb
2017-02-161Q2017 MAMA NANC19.0 ppb
2017-02-161Q2017 COLEMAN F23.0 ppb
2017-02-161Q2017 MCCHESNEY20.0 ppb
2017-05-102Q2017 MAMA NANC25.0 ppb
2017-05-102Q2017 MCCHESNEY26.0 ppb
2017-05-102Q2017 COLEMAN F29.0 ppb
2017-05-102Q2017 MUZAK COR27.0 ppb
2017-08-163Q2017 MAMA NANC64.0 ppb
2017-08-163Q2017 COLEMAN F49.0 ppb
2017-08-163Q2017 MCCHESNEY63.0 ppb
2017-08-163Q2017 MUZAK COR54.0 ppb
2017-11-154Q2017 MCCHESNEY30.0 ppb
2017-11-154Q2017 MUZAK COR33.0 ppb
2017-11-154Q2017 MAMA NANC33.0 ppb
2017-11-154Q2017 COLEMAN F34.0 ppb