Diquat
Suburban East Salem WD
NOTE: Suburban East Salem WD purchases water from Salem Public Works which is required to test for diquat. Sample information shown below was taken by Salem Public Works.
Diquat is a herbicide used on potato crops and aquatic weeds.
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 | 1 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 4 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 6 ppb
The EWG Health Guideline of 6 ppb for diquat 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 cataracts.
EPA Maximum Contaminant
Level (MCL): 20 ppb
The legal limit for diquat, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1980s.
ppb = parts per billion
All test results
NOTE: Suburban East Salem WD purchases water from Salem Public Works which is required to test for diquat. Sample information shown below was taken by Salem Public Works.
| Date | Lab ID | Result |
|---|---|---|
| 2018-01-24 | 201801250239-S | ND |
| 2019-02-07 | 201902080338-S | ND |
| 2019-08-15 | 201908160799-S | ND |
| 2019-10-10 | 201910110546-S | ND |
| 2020-02-03 | 202002040118-S | ND |
| 2020-04-08 | 202004090573-S | ND |
| 2020-05-18 | 202005190119-S | ND |
| 2020-07-30 | 202007310210-S | ND |
| 2021-02-16 | 202102170345-S | ND |
| 2021-05-10 | 202105110678-S | ND |
| 2022-02-16 | 202202180003 | ND |
| 2022-06-23 | 380-6930-1-S | ND |
| 2023-01-04 | 380-33407-1-S | ND |
| 2023-04-27 | 380-45315-1-S | ND |
| 2023-08-15 | 380-59270-1-S | ND |
| 2023-10-31 | 380-69271-1-S | ND |