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EWG's Tap Water Database — 2019 UPDATE

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Cyanide (free)

Philadelphia Water Department

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.

 

12

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
2014N/A00N/A
20152.17 ppb61ND - 13.0 ppb
2016ND30ND
201719.7 ppb32ND - 36.0 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 (free) 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.

ppb = parts per billion

All test results

Date Lab ID Result
2015-07-0713874582ND
2015-07-071387458313.0 ppb
2015-07-0713874584ND
2015-11-2313518835ND
2015-11-2313518836ND
2015-11-2313518837ND
2016-11-0815232468ND
2016-11-0815232469ND
2016-11-0815232470ND
2017-12-271716864823.0 ppb
2017-12-271716864936.0 ppb
2017-12-2717168650ND