Thallium
Middletown Water Department
Thalium is a naturally occurring metal released into the environment from metal smelting and coal burning. Exposure to too much thalium can cause hair loss, liver damage, reduced sperm motility and nervous system impairment.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 2 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.1 ppb
The EWG Health Guideline of 0.1 ppb for thallium 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 internal organs.
EPA Maximum Contaminant
Level (MCL): 2 ppb
The legal limit for thallium, established in 1992, was based on analytical detection limits at the time that the standard was set.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-03-01 | IOC1 200489001 | ND |
| 2018-04-16 | IOC1 200492152 | ND |
| 2019-05-13 | IOC1 200531892 | ND |
| 2019-05-21 | IOC1 200533082 | ND |
| 2020-05-06 | IOC1 200574724 | ND |
| 2020-05-14 | IOC1 200575834 | ND |
| 2021-03-30 | IOC1 200611335 | ND |
| 2021-03-30 | IOC1 200611336 | ND |
| 2022-05-11 | E300182524 300182533 | ND |
| 2022-05-11 | E300182526 300182546 | ND |
| 2023-06-23 | E300370712 300370715 | ND |
| 2023-06-23 | E300370718 300370721 | ND |