Know Your Environment. Protect Your Health.

Diquat

Amicks Ferry Water System

NOTE: Amicks Ferry Water System purchases water from City of Columbia which is required to test for diquat. Sample information shown below was taken by City of Columbia.

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
2018ND20ND
2019ND40ND
2020ND10ND
2021ND10ND
2022ND20ND
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: Amicks Ferry Water System purchases water from City of Columbia which is required to test for diquat. Sample information shown below was taken by City of Columbia.

Date Lab ID Result
2018-03-12AE09073ND
2018-07-16AE15003ND
2019-01-08AE23570ND
2019-07-16AE33661ND
2020-10-14AE55739ND
2020-11-04AE56846ND
2021-10-13AE73342ND
2021-10-20AE73703ND
2022-09-08AE89410ND
2022-09-19AE89796ND
2023-09-06AF08032ND
2023-09-21AF08856ND