Diquat
Manchester Water Department
Diquat is a herbicide used on potato crops and aquatic weeds.
31
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 |
|---|---|---|---|---|
| 2018 | ND | 7 | 0 | ND |
| 2019 | ND | 10 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 14 | 0 | ND |
| 2023 | N/A | 0 | 0 | N/A |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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 |
|---|---|---|
| 2018-06-13 | AA84270-SOC5 | ND |
| 2018-06-13 | AA84269-SOC5 | ND |
| 2018-06-26 | AA84433-SOC5 | ND |
| 2018-06-27 | AA84458-SOC5 | ND |
| 2018-06-27 | AA84459-SOC5 | ND |
| 2018-06-29 | AA84479-SOC5 | ND |
| 2018-06-29 | AA84480-SOC5 | ND |
| 2019-09-16 | AA90007-SOC2 | ND |
| 2019-09-16 | AA89985-SOC2 | ND |
| 2019-09-16 | AA89986-SOC2 | ND |
| 2019-09-16 | AA89986-SOC2 | ND |
| 2019-09-16 | AA90001-SOC2 | ND |
| 2019-09-16 | AA90001-SOC2 | ND |
| 2019-09-16 | AA89989-SOC2 | ND |
| 2019-09-17 | AA89998-SOC2 | ND |
| 2019-09-17 | AA89998-SOC2 | ND |
| 2019-09-17 | AA90002-SOC2 | ND |
| 2022-06-21 | 220621-1-06 SOC | ND |
| 2022-06-21 | 220621-3-01SOC | ND |
| 2022-06-21 | 220621-3-02 SOC | ND |
| 2022-06-22 | 220622-3-03 SOC | ND |
| 2022-06-22 | 220622-3-04SOC | ND |
| 2022-06-22 | 220622-3-05 SOC | ND |
| 2022-06-22 | 220622-3-06 SOC | ND |
| 2022-09-01 | 220901-3-08SOC | ND |
| 2022-09-01 | 220901-3-09SOC | ND |
| 2022-09-01 | 220901-3-06SOC | ND |
| 2022-09-01 | 220901-3-07SOC | ND |
| 2022-09-07 | 220907-1-10SOC | ND |
| 2022-09-07 | 220907-3-05 SOC | ND |
| 2022-09-07 | 220907-3-06SOC | ND |