Know Your Environment. Protect Your Health.

Diquat

Georgetown, City of

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

 

9

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND20ND
2020ND30ND
2021ND10ND
2022ND10ND
2023ND10ND

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
2018-02-07AE07305ND
2019-01-09AE23823ND
2019-06-17AE32045ND
2020-01-15AE42955ND
2020-01-15AE42971ND
2020-01-22AE43349ND
2021-02-03AE60545ND
2022-11-16AE93058ND
2023-11-07AF11145ND