Diquat
Santa Clarita Water Division
Diquat is a herbicide used on potato crops and aquatic weeds.
56
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 | ND | 26 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 28 | 0 | ND |
| 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 |
|---|---|---|
| 2015-01-29 | 9590-002-1345 | ND |
| 2015-01-29 | 9590-009-1220 | ND |
| 2015-01-29 | 9590-019-0945 | ND |
| 2015-01-29 | 9590-016-1050 | ND |
| 2015-01-29 | 9590-008-1010 | ND |
| 2015-01-29 | 9590-025-1115 | ND |
| 2015-01-29 | 9590-012-1135 | ND |
| 2015-01-29 | 9590-039-1415 | ND |
| 2015-01-29 | 9590-015-1145 | ND |
| 2015-01-29 | 9590-013-1115 | ND |
| 2015-01-29 | 9590-006-1320 | ND |
| 2015-01-29 | 9590-040-1025 | ND |
| 2015-04-29 | 9590-015-0935 | ND |
| 2015-04-29 | 9590-012-1000 | ND |
| 2015-04-29 | 9590-016-1200 | ND |
| 2015-04-29 | 9590-013-1025 | ND |
| 2015-04-29 | 9590-008-1100 | ND |
| 2015-04-29 | 9590-009-1130 | ND |
| 2015-04-29 | 9590-019-0930 | ND |
| 2015-04-29 | 9590-039-1100 | ND |
| 2015-04-29 | 9590-006-1215 | ND |
| 2015-04-29 | 9590-040-0835 | ND |
| 2015-04-29 | 9590-002-1135 | ND |
| 2015-06-04 | 9590-007-0930 | ND |
| 2015-09-03 | 9590-007-1030 | ND |
| 2015-12-02 | 9590-025-1125 | ND |
| 2016-04-08 | 9590-014-0900 | ND |
| 2016-07-11 | 9590-014-0840 | ND |
| 2018-01-10 | 9590-013-0920 | ND |
| 2018-01-10 | 9590-040-1115 | ND |
| 2018-01-10 | 9590-002-0910 | ND |
| 2018-01-10 | 9590-039-0950 | ND |
| 2018-01-10 | 9590-006-0830 | ND |
| 2018-01-10 | 9590-025-1330 | ND |
| 2018-01-10 | 9590-007-1020 | ND |
| 2018-01-10 | 9590-019-1100 | ND |
| 2018-01-10 | 9590-008-1210 | ND |
| 2018-01-10 | 9590-009-1150 | ND |
| 2018-01-10 | 9590-014-1020 | ND |
| 2018-01-10 | 9590-012-1310 | ND |
| 2018-01-10 | 9590-015-0830 | ND |
| 2018-02-14 | 9590-016-1035 | ND |
| 2018-04-11 | 9590-015-1435 | ND |
| 2018-04-11 | 9590-019-1050 | ND |
| 2018-04-11 | 9590-007-0730 | ND |
| 2018-04-11 | 9590-009-1135 | ND |
| 2018-04-11 | 9590-008-1200 | ND |
| 2018-04-11 | 9590-025-1045 | ND |
| 2018-04-11 | 9590-006-0800 | ND |
| 2018-04-11 | 9590-012-1005 | ND |
| 2018-04-11 | 9590-014-1000 | ND |
| 2018-04-11 | 9590-039-0915 | ND |
| 2018-04-11 | 9590-002-0720 | ND |
| 2018-04-11 | 9590-016-1220 | ND |
| 2018-04-11 | 9590-013-0910 | ND |
| 2018-04-11 | 9590-040-0815 | ND |