Know Your Environment. Protect Your Health.

Diquat

Collegeville Trappe Joint Public Works Department

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

 

40

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
2019N/A00N/A
2020ND200ND
2021N/A00N/A
2022N/A00N/A
2023ND200ND

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
2020-05-0422213259.00ND
2020-05-0422213229.00ND
2020-05-0422213289.00ND
2020-05-1822213526.00ND
2020-05-1822213495.00ND
2020-05-1822213556.00ND
2020-05-1822213465.00ND
2020-06-0822414081.00ND
2020-06-0822414141.00ND
2020-06-0822414111.00ND
2020-08-0322797485.00ND
2020-08-0322797261.00ND
2020-08-0322797350.00ND
2020-08-0322797290.00ND
2020-08-0322797320.00ND
2020-08-1722797866.00ND
2020-08-1722797837.00ND
2020-08-1722797808.00ND
2020-08-1722797778.00ND
2020-08-1722797749.00ND
2023-04-1728700780.00ND
2023-04-1728700777.00ND
2023-04-1728700782.00ND
2023-04-1728700781.00ND
2023-04-1728700779.00ND
2023-04-1728700778.00ND
2023-05-0128898904.00ND
2023-05-0128898903.00ND
2023-05-0128898902.00ND
2023-05-0128898905.00ND
2023-07-2429495684.00ND
2023-07-2429495686.00ND
2023-07-2429495685.00ND
2023-07-2429495692.00ND
2023-07-2429495691.00ND
2023-07-2429495683.00ND
2023-08-0729495689.00ND
2023-08-0729495687.00ND
2023-08-0729495690.00ND
2023-08-0729495688.00ND