Diquat
Henderson Municipal Water & Sewer
Diquat is a herbicide used on potato crops and aquatic weeds.
14
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 4 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
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
| Date | Lab ID | Result |
|---|---|---|
| 2014-03-06 | 2987179 | ND |
| 2014-04-02 | 3002477 | ND |
| 2014-08-04 | 3077510 | ND |
| 2014-10-06 | 3117911 | ND |
| 2015-02-03 | 3181346 | ND |
| 2015-05-06 | 3238313 | ND |
| 2015-08-05 | 3294626 | ND |
| 2015-10-05 | 3337604 | ND |
| 2016-02-01 | 3395977 | ND |
| 2016-05-03 | 3443292 | ND |
| 2016-09-08 | 3544381 | ND |
| 2016-12-08 | 3603519 | ND |
| 2017-03-07 | 3651171 | ND |
| 2017-04-10 | 3673246 | ND |