Know Your Environment. Protect Your Health.

Diquat

Ely Municipal Water Department

Diquat is a herbicide used on potato crops and aquatic weeds.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND20ND
2020ND10ND
2021ND20ND
2022ND40ND
2023ND20ND

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
2018-07-19201807240558ND
2019-08-14201908190150ND
2019-09-26201910010466ND
2020-08-27202009020451ND
2021-11-04202111100759ND
2021-12-09202112150655ND
2022-05-12380-1966-1ND
2022-07-07380-9979-1ND
2022-08-25810-36089-1ND
2022-08-25810-36089-2ND
2023-05-10380-47459-1ND
2023-09-13380-63507-1ND