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EWG's Tap Water Database — 2021 UPDATE

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Permethrin

Derry Water Department

NOTE: Derry Water Department purchases water from Manchester Water Works which is required to test for permethrin. Sample information shown below was taken by Manchester Water Works.

Permethrin is an insecticide used on agricultural crops, but most uses are non-agricultural. It can be applied to residential areas to control mosquitoes and ticks and also used as a bug repellent on clothing, as well as medical applications to treat head lice. Long-term exposure to permethrin may harm the liver.

 

3

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018ND30ND
2019N/A00N/A

ppb = parts per billion

All test results

NOTE: Derry Water Department purchases water from Manchester Water Works which is required to test for permethrin. Sample information shown below was taken by Manchester Water Works.

Date Lab ID Result
2018-01-17U8A0012-01ND
2018-08-06U8H0049-01ND
2018-10-17U8J0021-01ND