Serum dioxin study in Paritutu

Because of concerns by residents that illnesses might be due to dioxin exposures from the former Ivon Watkins-Dow plant in New Plymouth, the Ministry proposed a serum dioxins study of selected residents who live or did live at Paritutu, the nearest suburb to the plant.

Non-occupational health effects in the New Plymouth population

The aim of the survey is to determine the level of dioxin exposure in comparison with the levels found in the Ministry for the Environment’s background population study.

The final report of a study to investigate historical exposure to dioxin among current and former residents of the New Plymouth suburb of Paritutu was released on 10 March 2005.

The study, conducted by the Institute of Environmental Science and Research (ESR), was to determine whether residents who lived close to the former Ivon Watkins Dow (IWD) agrichemical plant while the herbicide 2,4,5-T was being made from 1962 to 1987 had dioxin levels higher than other New Zealanders.

Final Report

You can download the final report below in Word format.

Study summary


Important: Ministry of Health disclaimer

The data and analyses contained in A Study of 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) Exposures in Paritutu, New Zealand have been supplied to the Ministry of Health by the Institute of Environmental Science and Research Ltd (ESR).

The Ministry of Health cannot confirm the accuracy of the data and the analyses, and accepts no liability or responsibility for any acts or omissions, done or omitted in reliance, in whole or in part, on the data or the analyses.

Peer reviews

2005 Peer Reviews

2006-7 Peer Reviews

Following a report by forensic accountant,John Leonard, which was broadcast on TV3 as part of the documentary “Let us Spray”, further independent peer reviews were carried out.

Rebuttals of Leonard's review


Back to top