Dairy Effluent Warrant of Fitness

The Effluent WOF programme consists of a voluntary, independent inspection of a farmer’s effluent infrastructure and practices.

After extensive testing with over 200 farmers, Effluent WOF is now available to farmers and rural professionals around the country.

The Effluent WOF programme is insightful and practical, covering the entire effluent system.

An independent assessor points out areas of risk and suggest practical actions a farmer can take to ensure their system is capable of being compliant 365 days a year.

A 3-4 hour assessment by the accredited assessor covers the farm’s effluent consents and permitted rules, the storage capacity, nutrient loadings, soil risk, irrigator performance, off-pasture infrastructure and general health and safety requirements.

All WoF Assessors are trained professionals who are fully certified as Warrant of Fitness Assessors. Every assessor has completed the Farm Dairy Effluent System Warrant of Fitness Course and a subsequent field assessment.


  • Buying or selling a farm?

    Know if the system is fit for purpose or if you need to factor upgrades into the offer.

  • Are you a share milker coming onto a property?

    Find out what the risk is for your farm.

  • Upgraded the effluent system yourself?

    Find out how well the effluent system is performing and reassurance that your system is fit for purpose.

  • Budgeted for an upgrade to the system?

    An independent person who assesses the current system will help with decision making.

  • Did you know?

    Corporate Board members and absent owners can be liable if there is inadequate effluent infrastructure on a farm.

Greig Stephens

First Base Ltd


First Base Ltd
61 Leet Street
This email address is being protected from spambots. You need JavaScript enabled to view it.
027 459 6924

Having spend much in the High country of the South Island, he has an absolute love of the country and the folk that farm our country.

Educational choices and opportunities took him away from farming and into the field of Civil Engineering but his love for the land is still strong.

Qualifying as an Effluent Assessor in 2017, affords him an opportunity to finally work in the Agricultural sector. This coupled with his engineering skills of pumps, pipes, and earthworks gives him the ability to look at many situations and draw some good information and solutions for possible problems.

Greig, in partnership, has recently started a Health and safety company (First Base Ltd) that provides small to medium business with Health and safety systems and advice. Many of his current customers come from the farming sector.

Greig see significant strength in being able to offer farmers Dairy effluent system assessment, H&S systems and advice, and Engineering ideas that are common on typical farms.

Call him for a chat on 0274 596924


Certified WOF assessors offer a very thorough and consistent assessment of effluent systems.

A certified assessor is an independent, experienced industry professional.

To become certified, the assessor has completed a three-day training course and passed a competency assessment process.

The assessor is committed to observing a Code of Conduct to guarantee professional behaviour and independent advice.

Certified WOF Assessors use the same methodology every time.


Latest News

Effluent WoF Reassures


The assessment includes the farm's effluent consents and permitted rules, storage capacity, nutrient loadings, soil risk, and health and saftey..

Ewen Mathieson WoF story

Ewen Mathieson WoF story - AGRIBUSINESS

The assessment includes the farm's effluent consents and permitted rules, storage capacity, nutrient loadings, soil risk, and health and saftey..

Go to top