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EWG's Tap Water Database — 2019 UPDATE

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2,4,5-TP (Silvex)

La Habra Heights County Water District

2(2,4,5-trichlorophenoxy) propionic acid (2,4,5-TP or Silvex) is a cancer-causing herbicide banned in the U.S. in 1985 because of its toxicity. It is still detected as a groundwater contaminant in areas where it was sprayed or stored.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
2013N/A00N/A
2014N/A00N/A
2015ND60ND
2016ND20ND
2017N/A00N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 3 ppb

The EWG Health Guideline of 3 ppb for 2,4,5-TP 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 harm to internal organs.

EPA Maximum Contaminant
Level (MCL) 50 ppb

ppb = parts per billion

All test results

Date Lab ID Result
2012-03-292706-009-0855ND
2012-03-292706-010-0920ND
2012-04-172706-009-1308ND
2012-04-172706-010-1335ND
2015-04-109588-009-0909ND
2015-04-109588-010-0920ND
2015-07-289588-009-0935ND
2015-07-289588-010-1057ND
2015-09-169588-006-1010ND
2015-12-169588-006-0955ND
2016-03-219588-005-0920ND
2016-06-039588-005-1005ND