Diquat
Beaufort-Jasper Water & Sewer Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
25
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 | 2 | 0 | ND |
| 2015 | ND | 7 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 7 | 0 | ND |
| 2019 | ND | 4 | 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
| Date | Lab ID | Result |
|---|---|---|
| 2014-04-08 | AD38182 | ND |
| 2014-04-08 | AD38151 | ND |
| 2015-05-19 | AD55636 | ND |
| 2015-05-19 | AD55646 | ND |
| 2015-07-08 | AD57756 | ND |
| 2015-07-08 | AD57758 | ND |
| 2015-07-08 | AD57785 | ND |
| 2015-07-08 | AD57787 | ND |
| 2015-07-08 | AD57798 | ND |
| 2016-06-08 | AD76946 | ND |
| 2016-06-08 | AD76957 | ND |
| 2016-06-08 | AD76958 | ND |
| 2017-07-12 | AD97171 | ND |
| 2017-07-12 | AD97170 | ND |
| 2018-04-05 | AE10402 | ND |
| 2018-04-05 | AE10406 | ND |
| 2018-04-05 | AE10427 | ND |
| 2018-04-05 | AE10428 | ND |
| 2018-04-05 | AE10465 | ND |
| 2018-04-05 | AE10466 | ND |
| 2018-04-05 | AE10468 | ND |
| 2019-04-18 | AE29060 | ND |
| 2019-09-24 | AE37656 | ND |
| 2019-09-24 | AE37681 | ND |
| 2019-09-26 | AE37873 | ND |