Diquat
Goodyear Water Department
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 |
|---|---|---|---|---|
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 10 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 11 | 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 |
|---|---|---|
| 2016-06-13 | 201601260059S | ND |
| 2016-06-13 | 201601260058S | ND |
| 2016-06-13 | 201601260057S | ND |
| 2016-06-13 | 201601260056S | ND |
| 2016-06-13 | 201601260055S | ND |
| 2016-11-09 | 201601260080S | ND |
| 2016-11-09 | 201601260079S | ND |
| 2016-11-09 | 201601260073S | ND |
| 2016-11-09 | 201601260072S | ND |
| 2016-11-09 | 201601260071S | ND |
| 2018-03-19 | 201803200264S | ND |
| 2018-05-14 | 201805150445S SO | ND |
| 2018-08-15 | 201808170337S | ND |
| 2018-12-10 | 201812110404S | ND |
| 2019-03-18 | 201903190404S | ND |
| 2019-03-18 | 201903190400S | ND |
| 2019-03-18 | 201903190393S | ND |
| 2019-03-18 | 201903190371S | ND |
| 2019-06-04 | 201906050239S | ND |
| 2019-08-29 | 201908300151S | ND |
| 2019-08-29 | 201908300144S | ND |
| 2019-08-29 | 201908300107S | ND |
| 2019-08-29 | 201908300090S | ND |
| 2019-08-29 | 201908300081S | ND |
| 2019-11-21 | 201911220333S | ND |