Know Your Environment. Protect Your Health.

Diquat

Newberg-springs, City of

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

 

10

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
2019ND20ND
2020N/A00N/A
2021N/A00N/A
20220.545 ppb21ND - 1.09 ppb
2023ND60ND

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
2019-10-08928106801-SND
2019-10-21929402401-SND
2022-10-04K2211482-001-S1.09 ppb
2022-10-04K2211485-001-SND
2023-03-133073019-01ND
2023-06-213173005-01-SND
2023-08-023215016-01ND
2023-09-193263004-01-SND
2023-09-193263003-01-SND
2023-10-233297005-01ND