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 |
|---|---|---|---|---|
| 2014 | ND | 3 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 3 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
|---|---|---|
| 2014-02-10 | 201402110122-S | ND |
| 2014-04-30 | 201405010614-S | ND |
| 2014-06-30 | 201407010127-S | ND |
| 2015-01-29 | 201501300125-S | ND |
| 2015-05-18 | 201505070224-S | ND |
| 2016-05-11 | 201604140078-S | ND |
| 2016-08-23 | 201608050473-S | ND |
| 2016-11-30 | 201611280122-S | ND |
| 2017-01-31 | 201702010756-S | ND |
| 2017-04-11 | 201704131257-S | ND |
| 2017-06-01 | 201706020201-S | ND |
| 2018-01-24 | 201801250239-S | ND |
| 2019-02-07 | 201902080338-S | ND |
| 2019-08-15 | 201908160799-S | ND |
| 2019-10-10 | 201910110546-S | ND |