Diquat
City of Surprise - Mountain Vista
Diquat is a herbicide used on potato crops and aquatic weeds.
47
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 | ND | 4 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 17 | 0 | ND |
| 2019 | ND | 16 | 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 |
|---|---|---|
| 2014-01-22 | 4011817-04S | ND |
| 2014-01-22 | 4011817-03S | ND |
| 2014-01-22 | 4011817-02S | ND |
| 2014-01-22 | 4011817-01S | ND |
| 2015-01-21 | 5011694-04 | ND |
| 2016-01-25 | 6012035-04T | ND |
| 2016-01-25 | 6012035-03T | ND |
| 2016-01-25 | 6012035-03S | ND |
| 2016-01-25 | 6012035-02T | ND |
| 2016-01-25 | 6012035-01T | ND |
| 2017-01-30 | 7012591-03S | ND |
| 2017-01-30 | 7012591-01S | ND |
| 2017-01-30 | 7012591-02S | ND |
| 2017-01-30 | 7012591-04S | ND |
| 2018-01-08 | 18A0734-04SOC | ND |
| 2018-01-08 | 18A0734-03SOC | ND |
| 2018-01-08 | 18A0734-02SOC | ND |
| 2018-01-08 | 18A0734-01SOC | ND |
| 2018-01-22 | 18A2180-01SOC | ND |
| 2018-04-09 | 18D0971-04 SOC | ND |
| 2018-04-09 | 18D0971-03 SOC | ND |
| 2018-04-09 | 18D0971-02 SOC | ND |
| 2018-04-09 | 18D0971-01 SOC | ND |
| 2018-07-24 | 18G2558-04 | ND |
| 2018-07-24 | 18G2558-03 | ND |
| 2018-07-24 | 18G2558-02 | ND |
| 2018-07-24 | 18G2558-01 | ND |
| 2018-10-08 | 18J0826-04 | ND |
| 2018-10-08 | 18J0826-03 | ND |
| 2018-10-08 | 18J0826-02 | ND |
| 2018-10-08 | 18J0826-01 | ND |
| 2019-01-23 | 19A2463-01 | ND |
| 2019-01-23 | 19A2463-02 | ND |
| 2019-01-23 | 19A2463-03 | ND |
| 2019-01-23 | 19A2463-04 | ND |
| 2019-04-29 | 19D3107-04 | ND |
| 2019-04-29 | 19D3107-03 | ND |
| 2019-04-29 | 19D3107-02 | ND |
| 2019-04-29 | 19D3107-01 | ND |
| 2019-07-10 | 19G1241-04 | ND |
| 2019-07-10 | 19G1241-03 | ND |
| 2019-07-10 | 19G1241-02 | ND |
| 2019-07-10 | 19G1241-01 | ND |
| 2019-10-09 | 19J1279-01 | ND |
| 2019-10-09 | 19J1279-04 | ND |
| 2019-10-09 | 19J1279-03 | ND |
| 2019-10-09 | 19J1279-02 | ND |