Know Your Environment. Protect Your Health.

Diquat

Ruth Water District

NOTE: Ruth Water District purchases water from Ely Municipal Water Department which is required to test for diquat. Sample information shown below was taken by 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

NOTE: Ruth Water District purchases water from Ely Municipal Water Department which is required to test for diquat. Sample information shown below was taken by Ely Municipal Water Department.

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