Prestigious ACENZ Awards for Harrison Grierson

August 2017

Harrison Grierson enjoyed a fantastic outcome at the Association of Consulting Engineers of New Zealand (ACENZ) Gala Awards on Saturday night....

read more

Landscape architecture award win for HG

April 2017

Last night, landscape architects from our urban design team won an Award of Excellence in the commercial category of the NZILA Awards...

read more


December 2016

Last month, Harrison Grierson was honoured to win the Most Improved Award for Medium-Large organisations in the IBM Kenexa Best Workplaces...

read more


April 2016

Our work on the Scott Point Structure Plan and Plan Variation in Auckland has won two awards - including the prestigious Supreme Practice Award...

read more

Harrison Grierson Wins Silver at Best Awards

October 2014

We’re officially one of the best. Our new visual identity won a Silver Award at The Designers’ Institute of New Zealand Best Awards on Friday Oc...

read more

Harrison Grierson wins two prestigious awards

August 2014

Two separate major projects have received prestigious awards from highly respected industry bodies, IPENZ and ACENZ....

read more

Harrison Grierson’s new visual identity a finalist in design awards

August 2014

Harrison Grierson’s new visual identity is a finalist in the Designers Institute of New Zealand Best Awards 2014....

read more


August 2014

Water treatment paper wins gold Congratulations to......

read more

Harrison Grierson wins two prestigious awards

August 2014

IPENZ sustainability award

Together with Watercare Services Limited and Fulton Hogan, our work on Restoring the Health of Kawakawa Bay Project received a Merit Award in the IPENZ Auckland branch’s recent Arthur Mead Awards.

The project, a $22million sewerage scheme at Kawakawa Bay in Auckland, was implemented by Watercare Services Ltd to counter chronic pollution in the Bay’s 4km foreshore. The pollution was caused by failing septic tanks which serviced many of the Bay’s baches and had resulted in warning signs prohibiting swimming and shellfish gathering, together with a moratorium on further development.

The Harrison Grierson-designed scheme included the New Zealand first application of a vacuum sewage system and a biological nutrient removal sewage treatment plant using ultrafiltration to ensure that sewage was treated to world class standards.

The design created an enhanced, biological treatment environment where the activity levels of naturally occurring bacteria can be manipulated to remove the organic contaminants from the sewage. The highly treated sewage is then filtered through semi-permeable membranes to disinfect the effluent so it can be safely disposed of by spray irrigation in forest areas more than 2km from the foreshore. 

The IPENZ judges commended the efforts we went to before tendering to prove the suitability of our design. 

They said:  “This robust solution reduced energy use, mitigated risk and allows for future development in the area. It feeds into a well-specified treatment plant which provides a small footprint and minimal operating overhead, producing high quality effluent for disposal by forest irrigation.” 

The IPENZ award is for major projects that address sustainability, potential adverse environmental effects, waste management and community involvement.  It recognises the significant contributions of members to preserving, conserving and improving the environment. 

ACENZ Innovate Awards

Our work on the Kerepehi Water Treatment Plant in the Hauraki Plains received a Silver Excellence Award at the recent ACENZ Innovate Awards.

In June 2010, Hauraki District Council commissioned us to upgrade the Kerepehi Plant. The aim was to meet the drinking water standards, raise the WTP capacity to 12, 500 m3/day, and to make the plant more resistant to extreme turbidity spikes in the raw water caused by King Tide events in the Waihou River.

By December 2012, the Council had all they wanted and more. The upgrade was delivered for $3m below initial estimates and was commissioned on time and able to supply the region during the worst drought in 70 years (December 2012).

The Kerepehi WTP supplies the Hauraki Plains area and the local dairy farming industry (approx.150,000 cows). Critical to the economic sustainability of the region, multiple designs were fully developed to ensure the Council was getting the most cost effective solution. The selected design solution reconstructed the existing clarifiers with tube settlers and required the installation of new package membrane plant.

During a King Tide event in February 2013, the new plant successfully treated muddy water 40 times dirtier than normal. The rejuvenation of existing infrastructure, innovative control techniques, lateral thinking, and inventive equipment arrangements were just a few of the innovative and creative solutions developed to form the final solution.

The award judges considered the technical excellence of our design and execution by evaluating complexity, innovation, depth of technical knowledge, the elegance of the solution, social environmental impacts and the client relationship of our entry.