Know Your Environment. Protect Your Health.

Diquat

Ardmore Water System

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

 

11

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019ND40ND
2020N/A00N/A
2021N/A00N/A
2022ND70ND
2023N/A00N/A

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
2019-01-2419010621-001HND
2019-01-2419010621-002HND
2019-09-1020120791001_ISOCND
2019-10-2920128009001_ISOCND
2022-02-2835699992001ND
2022-02-2835699992002ND
2022-05-2335719548001_ISOCND
2022-05-2335719549001_ISOCND
2022-05-2335719550001_ISOCND
2022-11-2835762267001A_ISOCND
2022-11-2835762267001_ISOCND