Diquat
Hot Springs Village Waterworks
Diquat is a herbicide used on potato crops and aquatic weeds.
11
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 | 2 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | 0.460 ppb | 5 | 1 | ND - 2.30 ppb |
| 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 |
|---|---|---|
| 2015-01-06 | 15008002908 | ND |
| 2015-04-01 | 15092000908 | ND |
| 2018-01-17 | 18019002808 | ND |
| 2018-04-02 | 18095004508 | 2.30 ppb |
| 2018-04-17 | 18109007401 | ND |
| 2018-08-29 | 18242000801 | ND |
| 2018-12-05 | 18340005801 | ND |
| 2019-01-30 | 19031008301 | ND |
| 2019-04-03 | 4247983 | ND |
| 2019-07-09 | 19192001001 | ND |
| 2019-10-30 | 19304001501 | ND |