Arsenic
Middletown Water Department
Arsenic is a potent carcinogen and common contaminant in drinking water. Arsenic causes thousands of cases of cancer each year in the U.S. Click here to read more about arsenic.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
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 | 1.25 ppb | 4 | 1 | ND - 5.00 ppb |
| 2018 | 0.250 ppb | 4 | 1 | ND - 1.000 ppb |
| 2019 | ND | 4 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.004 ppb
The EWG Health Guideline of 0.004 ppb for arsenic 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 cancer.
EPA Maximum Contaminant
Level (MCL) 10 ppb
The legal limit for arsenic, established in 2001, was based on costs for arsenic removal, as calculated at the time that the standard was set. This limit does not fully protect against the risk of cancer due to arsenic exposure.
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 | IOC1 200443422 | ND |
| 2016-06-29 | IOCR 200443423 | ND |
| 2017-05-16 | IOCS 200467163 | ND |
| 2017-05-16 | RIOC 200467168 | 5.00 ppb |
| 2017-05-16 | RIOC 200467167 | ND |
| 2017-05-16 | IOCS 200467165 | ND |
| 2018-03-01 | IOC1 200489001 | ND |
| 2018-03-01 | IOCR 200489002 | ND |
| 2018-04-16 | IOC1 200492152 | ND |
| 2018-04-16 | IOCR 200492151 | 1.000 ppb |
| 2019-05-13 | IOC1 200531892 | ND |
| 2019-05-13 | IOCR 200531894 | ND |
| 2019-05-21 | IOC1 200533082 | ND |
| 2019-05-21 | IOCR 200533084 | ND |