Cyanide
Middletown 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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | ND | 4 | 0 | ND |
2015 | ND | 4 | 0 | ND |
2016 | ND | 4 | 0 | ND |
2017 | ND | 4 | 0 | ND |
2018 | ND | 4 | 0 | ND |
2019 | ND | 3 | 0 | ND |
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 |
---|---|---|
2014-06-09 | IOC1 200397419 | ND |
2014-06-09 | IOCR 200397420 | ND |
2014-06-09 | IOCR 200397421 | ND |
2014-06-09 | IOC1 200397418 | ND |
2015-05-26 | IOC1 200417356 | ND |
2015-05-26 | IOC1 200417357 | ND |
2015-05-26 | IOCR 200417358 | ND |
2015-05-26 | IOCR 200417359 | ND |
2016-06-20 | IOC1 200442684 | ND |
2016-06-20 | IOCR 200442685 | ND |
2016-06-29 | IOCR 200443423 | ND |
2016-06-29 | IOC1 200443422 | ND |
2017-05-16 | IOCS 200467163 | ND |
2017-05-16 | IOCS 200467165 | ND |
2017-05-16 | RIOC 200467167 | ND |
2017-05-16 | RIOC 200467168 | ND |
2018-03-01 | IOC1 200489001 | ND |
2018-03-01 | IOCR 200489002 | ND |
2018-04-16 | IOC1 200492152 | ND |
2018-04-16 | IOCR 200492151 | ND |
2019-05-13 | IOCR 200531894 | ND |
2019-05-21 | IOC1 200533082 | ND |
2019-05-21 | IOCR 200533084 | ND |