Location of Effluent Storage    

Answers to frequently asked questions about the location of effluent storage.

Where Should Effluent Storage Be Located?    

DairyNZ’s ‘Farm dairy effluent systems – A farmer’s guide to building a new effluent storage pond’ provides useful information on the factors to consider when siting a pond. Tasman District Council supports this information and IPENZ recommendations regarding locating new effluent facilities a minimum of 90m away from boreholes and 20m from surface water.

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How Far Does a Pond Need to be from a Road or the Neighbours?    

Tasman District Council rules specify that any odour associated with effluent must not cause an adverse effect past the property boundary.

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What are the New Zealand Food Standard Distances for Effluent Facilities?    

Currently food standards require a separation distance of 45m or 10m for a fully sealed and vented tank. However there may be other requirements and/or exceptions to these regulations so it is important to confirm these regulations before construction.

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What is Groundwater and Why is it so Important?    

Groundwater provides a long term store for drinking water and water feeding into our waterways and wetland habitats. Contaminated and degraded groundwater (below world drinking and/or Australia New Zealand Environment Council standards) can have health and biodiversity implications. Depending on water table depth and geology it can take decades for pollutants to pass through soils to groundwater, therefore current monitoring data may not be reflective of the intensification of dairying that has occurred since the 1980s. The implementation of mitigation measures to prevent further degradation is necessary to ensure that there are safe water supplies in the future.

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How Do We Find Out About Groundwater Levels?    

Groundwater levels are very site specific and can vary considerably even over a small area. As a starting point, gathering information based on the depth of local boreholes can be useful. This information can be supplied by the Tasman District Council or more detailed information may be held by local geotechnical specialists.

Before commencing any construction works it is recommended to dig a test pit in the area selected for construction, to a depth of at least 1m below the finished depth of the pond. Consideration should also be given to seasonal variations when digging test pits.

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