Diquat
East Jefferson Waterworks District 1
Diquat is a herbicide used on potato crops and aquatic weeds.
54
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 | 6 | 0 | ND |
| 2015 | ND | 12 | 0 | ND |
| 2016 | ND | 12 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 12 | 0 | ND |
| 2019 | ND | 12 | 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 |
|---|---|---|
| 2014-01-06 | AD88200 | ND |
| 2014-01-06 | AD88198 | ND |
| 2014-01-06 | AD88200 | ND |
| 2014-01-06 | AD88199 | ND |
| 2014-01-06 | AD88198 | ND |
| 2014-01-06 | AD88199 | ND |
| 2015-02-23 | 35177313003 | ND |
| 2015-02-23 | 35177313004 | ND |
| 2015-02-23 | 35177313005 | ND |
| 2015-02-23 | 35177313005 | ND |
| 2015-02-23 | 35177313004 | ND |
| 2015-02-23 | 35177313003 | ND |
| 2015-09-30 | 35209766003 | ND |
| 2015-09-30 | 35209766004 | ND |
| 2015-09-30 | 35209766005 | ND |
| 2015-09-30 | 35209766005 | ND |
| 2015-09-30 | 35209766003 | ND |
| 2015-09-30 | 35209766004 | ND |
| 2016-01-20 | 35226299003 | ND |
| 2016-01-20 | 35226299004 | ND |
| 2016-01-20 | 35226299005 | ND |
| 2016-01-20 | 35226299003 | ND |
| 2016-01-20 | 35226299005 | ND |
| 2016-01-20 | 35226299004 | ND |
| 2016-12-07 | 35282147002 | ND |
| 2016-12-07 | 35282147001 | ND |
| 2016-12-07 | 35282147002 | ND |
| 2016-12-07 | 35282147003 | ND |
| 2016-12-07 | 35282147003 | ND |
| 2016-12-07 | 35282147001 | ND |
| 2018-03-15 | 35380393001 | ND |
| 2018-03-15 | 35380393002 | ND |
| 2018-03-15 | 35380393003 | ND |
| 2018-03-15 | 35380393003 | ND |
| 2018-03-15 | 35380393002 | ND |
| 2018-03-15 | 35380393001 | ND |
| 2018-08-15 | 35411635001 | ND |
| 2018-08-15 | 35411635003 | ND |
| 2018-08-15 | 35411635002 | ND |
| 2018-08-15 | 35411635001 | ND |
| 2018-08-15 | 35411635003 | ND |
| 2018-08-15 | 35411635002 | ND |
| 2019-04-11 | 35461219001 | ND |
| 2019-04-11 | 35461218001 | ND |
| 2019-04-11 | 35461217001 | ND |
| 2019-04-11 | 35461217001 | ND |
| 2019-04-11 | 35461218001 | ND |
| 2019-04-11 | 35461219001 | ND |
| 2019-08-01 | 35486654001 | ND |
| 2019-08-01 | 35486659001 | ND |
| 2019-08-01 | 35486656001 | ND |
| 2019-08-01 | 35486654001 | ND |
| 2019-08-01 | 35486659001 | ND |
| 2019-08-01 | 35486656001 | ND |