Water Quality and Testing Procedure
AES water quality and testing procedure on Youtube

New Zealand Standards

NZ AS/NZ 1547: 2012 On-site domestic Wastewater Management (many local authorities are still using the 2000 version)

Auckland Council (formerly Auckland Regional Council) TP 58 (Technical Publication 58)

On-Site Wastewater Systems Design and Management
One Plan Manual for On-site Wastewater Systems Design and Management, produced by Horizons Regional Council

Septic Tanks
Lanfax Labs re Septic Tanks 

US Developer & Manufacturer – Presby Environmental

 Harvey Tanks – Septic Tanks

N2P Controls