The Health (Treatment of Sewage and Disposal of Effluent and Liquid Waste) Regulation 1974 requires all Primary Treatment Systems (PTSs) (also known as Septic Tanks) to be approved by the Chief Health Officer.
The department now requires all manufacturers’ to comply with the Code of Practice for Product Approval of Onsite Wastewater Systems which requires all PTSs to be certified to AS/NZS 1546.1. This will ensure that the quality standards of all PTSs manufactured in WA are in line with the Australian Standards.
Please be aware that the minimum capacity of a PTS treating all wastes connected to a residential premises up to 5 bedrooms is 3180L. A single tank can be approved for residential installation only when it is fitted with a baffle as an approved product and has a capacity equal to or larger than 3180L.
A primary treatment system with a single baffled tank with a capacity less than 3180L can be approved for small commercial installations only when the wastewater volume combined with the 1820L reserve is less than the total system capacity and an engineering certificate is provided to confirm the integrity of the configuration.
The following tables detail the specifications of precast concrete septic tanks (Table 1) and non-concrete septic tanks (Table 2) approved for use in Western Australia.
Table 1: Approved precast concrete septic tanks
Table 2: Approved non-concrete septic tanks
For more detailed information on approval process for sewage holding tanks, please refer to Guidance for the use of sewage holding tanks associated with temporary ablution blocks.
Manufacturer |
Model |
Capacity (L) |
AS certification (valid until) |
Coerco (external site)
Ph: 1800 646 277
|
SEP-1450
Septic / Holding Tank
|
1450 |
SMK40330
(2 November 2024)
|
SEP-2200
Septic / Holding Tank
|
2200 |
SEP / NEP-3200
Septic / Holding Tank
(Baffle option)
|
3200 |
SEP-3500
Septic / Holding Tank |
3500 |
SEP / NEP-4000
Septic / Holding Tank
(Baffle option) |
4000 |
SEP-7000
Septic / Holding Tank
|
7000 |
SEP-11000
Septic / Holding Tank |
11000 |
SEP-15000
Septic / Holding Tank
|
15000 |
SEP-19000
Septic / Holding Tank
|
19000 |
SEP-23000
Septic / Holding Tank |
23000 |
SEP-27000
Septic / Holding Tank |
27000 |
SEP-31000
Septic / Holding Tank |
31000 |
VUT600/900/1200 Pump Tank |
600/900/1200 |
Everhard Industries Pty Ltd (external site)
Ph: (08) 9417 8222 |
Everhard 4000L Septic / Holding Tank
(Baffle option)
|
4000 |
SMK01950
(15 June 2028)
|
Everhard 3000L Septic / Holding Tank
(Baffle option)
|
3000 |
Everhard 2500L Septic / Holding Tank
|
2500 |
Everhard 1000L Pump Tank |
1000 |
Everhard 250/450L Pump Tank
|
250/450 |
Global Roto-Moulding (external site)
Ph: 1800 666 333
|
GR-SP 3000
|
3057 |
SMK40297
(20 April 2025)
|
GR-SP 4500
|
4500 |
GR-SP 5000
|
5000 |
GR-SP 6000
|
6000 |
GRAF Plastics Australia Pty Ltd (external site)
info@grafaustralia.com.au
Ph: 1300 131 971
|
CARAT 2700
Septic / Holding Tank
|
2700 |
Global certification #183 (external site)
(26 April 2024)
|
CARAT 3750
Septic / Holding Tank
(Baffle option) |
3750
|
CARAT 4800
Septic / Holding Tank
(Baffle option)
|
4800 |
CARAT 6500
Septic / Holding Tank
(Baffle option)
|
6500 |
CARAT XL 8500
Septic / Holding Tank
|
8500 |
CARAT XL 10000
Septic / Holding Tank
|
10000 |
Platin XL
Holding tanks
|
10000 &15000 |
Platin XXL
Holding tanks
|
20000, 25000 & 30000 |
Platin
Holding tanks
|
1500 |
3000 |
5000 |
Sapphire
Holding tanks |
600 |
900 |
1200 |
1500 |
Lilo
Holding tanks
|
1500 |
3000 |
5000 |
Rondus
Holding tanks
|
3000 |
Herkules
Holding tanks
|
1600 |
Columbus
Holding tanks
|
6500 |
Halgan Pty Ltd (external site)
info@halgan.com.au
Ph: 1800 626 753
|
HSEPS Septic Tanks |
1000 |
Global-Mark
Certification #100896
(6 March 2025)
|
1500 |
2000 |
3000 |
4000 |
5000 |
Innotech Site Services Pty Ltd (external site)
Ph: (08) 9353 6688
|
IIS6000ST (baffled)
|
6070 |
Approved for commercial installations ONLY.
|
Reln Pty Ltd (external site)
Ph: 1300 137 356
|
3200L
Holding Tank |
3200 |
AMI 1651
(07 July 2025)
|
3200L Deep Invert
Holding Tank
|
3200 |
3200L 2:1
Septic Tank (Baffled)
|
3200 |
3200L Deep Invert
Septic Tank
(Baffled)
|
3200 |
4000L
Holding Tank
|
4000 |
4000L 2:1
Septic Tank (Baffled)
|
4000 |
1200L
Pump Tank
|
1200/1000/900 |
450/600L
Pump Tank
|
600 |
Sepron (external site)
sales@sepron.com.au
Ph: 1300 017 170
|
SEP-500
Pump Tank
|
500 |
SMKH25655
(13 February 2029) |
SEP-1000
Pump Tank
|
1000 |
SEP-1500 |
1500 |
SEP-2200
(No baffle) |
2200 |
Underslung holding tanks for prefabricated ablution blocks |
Formit Services Pty Ltd (external site)
Ph: (02) 4336 1000
|
POTF 20 |
2000 |
Maximum use of 12 months. To be used with prefabricated ablution blocks only.
|
POTF 40 |
4000 |
POTF 60 |
6000 |
Coerco (external site)
Ph: 1800 646 277
|
ABWT2000 |
2000 |
ABWT4000
|
4000 |
ABWT6000
|
6000 |
ABWT8000
|
8000 |
ABWT10000
|
10000 |
ABWT12000
|
12000 |
Instant Products Group (external site)
Ph: (08) 9406 6600
|
7148 |
4000 |
7149 |
1500 |
7150 |
2500 |
7151 |
3400 |
7152 |
1150 |
7225 |
4000 |
7241 |
3400 |
More information
Environmental Health Directorate
Department of Health
Telephone: 9222 2000
Email: ehinfo@health.wa.gov.au
Last reviewed: 09-10-2023
Produced by
Environmental Health Directorate