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EWG's Tap Water Database — 2019 UPDATE

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Cyanide

City of Houston

Cyanide is a toxic chemical that causes central nervous system and thyroid toxicity. Water contamination is generally the result of metal mining and chemical industry waste, runoff from agriculture and road salts used for melting ice.

 

97

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
20146.58 ppb386ND - 80.0 ppb
201524.4 ppb94ND - 80.0 ppb
20167.78 ppb93ND - 40.0 ppb
201714.6 ppb4110ND - 100.0 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 150 ppb

The EWG Health Guideline of 150 ppb for cyanide was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against harm to the brain and nervous system.

EPA Maximum Contaminant
Level (MCL) 200 ppb

The legal limit for cyanide, established in 1992, was based on a 1955 toxicity study conducted in laboratory animals. This limit does not include any additional consideration of children’s health.

ppb = parts per billion

All test results

Date Lab ID Result
2014-03-14AC47084ND
2014-03-14AC47083ND
2014-03-14AC47085ND
2014-04-16AC50768ND
2014-04-16AC50769ND
2014-04-16AC50774ND
2014-04-16AC50773ND
2014-04-16AC5077030.0 ppb
2014-04-16AC5077520.0 ppb
2014-04-17AC51005ND
2014-06-03AC55764ND
2014-06-03AC55765ND
2014-07-15AC5967060.0 ppb
2014-07-15AC5967150.0 ppb
2014-07-16AC5980410.00 ppb
2014-07-16AC5980580.0 ppb
2014-08-14AC63617ND
2014-08-14AC63618ND
2014-08-14AC63619ND
2014-10-08AC69124ND
2014-10-08AC69136ND
2014-10-08AC69131ND
2014-10-08AC69134ND
2014-10-08AC69130ND
2014-10-08AC69135ND
2014-10-08AC69133ND
2014-10-08AC69132ND
2014-10-08AC69127ND
2014-10-09AC69326ND
2014-10-09AC69330ND
2014-10-09AC69329ND
2014-10-09AC69328ND
2014-12-09AC74128ND
2014-12-09AC74137ND
2014-12-09AC74139ND
2014-12-09AC74141ND
2014-12-09AC74140ND
2014-12-09AC74138ND
2015-03-04AC8280640.0 ppb
2015-03-05AC8281180.0 ppb
2015-06-04AC94558ND
2015-06-04AC94559ND
2015-07-21AD0030460.0 ppb
2015-07-21AD00306ND
2015-07-21AD0030740.0 ppb
2015-07-21AD00305ND
2015-09-17AD07496ND
2016-02-18AD2417920.0 ppb
2016-03-03AD2680840.0 ppb
2016-03-16AD2896610.00 ppb
2016-03-16AD28967ND
2016-03-17AD29286ND
2016-09-20AD50267ND
2016-09-20AD50266ND
2016-09-21AD50630ND
2016-10-06AD52615ND
2017-01-26AD67029ND
2017-01-26AD67031ND
2017-01-26AD67026ND
2017-01-26AD67030ND
2017-02-28AD7233410.00 ppb
2017-02-28AD7232920.0 ppb
2017-03-01AD72674100.0 ppb
2017-03-01AD72673ND
2017-03-02AD72990ND
2017-03-28AD7705790.0 ppb
2017-03-28AD77059ND
2017-03-28AD7705870.0 ppb
2017-03-28AD77056ND
2017-03-29AD77342ND
2017-03-29AD77338ND
2017-03-29AD77337ND
2017-03-29AD77341ND
2017-04-26AD81082ND
2017-04-27AD81384ND
2017-05-31AD8605980.0 ppb
2017-07-06AD88416ND
2017-07-06AD8841590.0 ppb
2017-07-25AD90464ND
2017-09-11AD95354ND
2017-09-11AD95367ND
2017-09-11AD95372ND
2017-09-11AD95371ND
2017-09-11AD95368ND
2017-09-11AD9534920.0 ppb
2017-09-11AD95369ND
2017-09-26AD9791050.0 ppb
2017-09-26AD9791270.0 ppb
2017-09-26AD97913ND
2017-09-26AD97911ND
2017-11-07AE03770ND
2017-11-07AE03766ND
2017-11-07AE03771ND
2017-11-07AE03767ND
2017-11-14AE04672ND
2017-12-04AE06502ND
2017-12-04AE06501ND