Perth Sewer Discharge Limits - City & Developer Rules

Utilities and Infrastructure Western Australia 4 Minutes Read · published February 11, 2026 Flag of Western Australia

Perth, Western Australia developers must comply with sewer discharge standards set by the Water Corporation and local building/plumbing approvals when connecting new or altered premises to the reticulated sewer. This guide summarises where numeric limits, approval steps and enforcement responsibilities are recorded, how developers obtain trade-waste or sewer-connection approvals, and what to do if proposed discharge parameters exceed acceptance standards. It emphasises checking the Water Corporation trade-waste requirements early in design and coordinating with the City of Perth planning and plumbing compliance teams for building approvals and on-site drainage controls.

Contact the Water Corporation early for trade-waste acceptance advice.

Sewer discharge limits and controlling instruments

In Perth the primary operational limits for industrial and commercial effluent accepted to sewer are published by the Water Corporation in its Trade Waste Policy and associated standards; developer connection technical requirements are published in the Water Corporation developer services guidance. Local government (City of Perth) enforces plumbing and building approvals and refers sewer connection and trade-waste acceptance to the Water Corporation.

Developers should treat the Water Corporation Trade Waste Policy and Trade Waste Standards as the authoritative source for numeric limits such as biochemical oxygen demand (BOD), total suspended solids (TSS), oil and grease, pH and specified toxicants. For items not numerically published on a particular Water Corporation page, the statement on that page is "not specified on the cited page" and the Water Corporation should be contacted for site-specific limits.[1]

Penalties & Enforcement

Enforcement of sewer discharge rules is undertaken primarily by the Water Corporation for trade-waste acceptance and by the City of Perth for local plumbing and building compliance; regulatory powers derive from the Water Services legislation and local government building/plumbing compliance functions. Exact monetary penalty amounts for contravening trade-waste acceptance limits or connecting without approval are not specified on the cited Water Corporation developer pages and must be confirmed from the applicable notice or enforcement instrument.[1]

  • Fines: specific monetary amounts for trade-waste or unauthorised discharges - not specified on the cited page.
  • Escalation: first, repeat or continuing offence treatment and per-day continuing offence amounts - not specified on the cited page.
  • Non-monetary sanctions: orders to stop discharge, remedial work directions, disconnection of service, and referral to courts or regulatory bodies.
  • Enforcer and complaints: Water Corporation (trade waste and connections) and City of Perth (plumbing/building compliance); use Water Corporation developer/trade-waste contacts for technical enforcement queries and City of Perth compliance contact pages for local approval disputes.[2]
  • Appeal/review: appeal and review routes and statutory time limits are not specified on the cited Water Corporation developer pages and should be confirmed with the issuer of any direction or penalty.
If you receive a compliance direction act quickly to preserve appeal rights and evidence.

Applications & Forms

Developers normally need to lodge a trade-waste application or developer sewer connection application with the Water Corporation and obtain any required plumbing approvals from the City of Perth or an authorised plumbing permit issuer.

  • Trade Waste Application (Water Corporation): application form and technical checklist — see Water Corporation trade-waste pages for current forms and submission method.[1]
  • Sewer Connection / Developer Services: applications for new connections, service widening or relocation are available from the Water Corporation developer services pages; fees and lodgement instructions are published there.
  • Fees: application and connection fees are published on the Water Corporation developer pages or quoteable on application; specific fee figures may be updated and are not specified on the cited explanatory page.
  • Submission: electronic form submission via Water Corporation portals or as directed on the application form; plumbing permits lodged via City of Perth building/plumbing channels when applicable.

Action steps for developers

  • Step 1: Early design - review Water Corporation Trade Waste Policy and developer connection requirements to identify likely limits.
  • Step 2: Lodge trade-waste and/or sewer-connection applications and attach waste characterisation and treatment design.
  • Step 3: Implement pre-treatment as required to meet numerical limits and obtain written acceptance before discharge.
  • Step 4: Pay application and connection fees and comply with ongoing monitoring or trade-waste agreements.

FAQ

Do I need a trade-waste approval to connect a commercial property to sewer?
Yes. Commercial and industrial effluent that differs from domestic sewage generally requires trade-waste approval from the Water Corporation before discharge.
Where are numeric discharge limits published?
Numeric acceptance limits are published in the Water Corporation Trade Waste Policy and associated standards; site-specific limits may be issued on application.[1]
Who do I contact about a suspected illegal discharge to sewer?
Contact the Water Corporation complaints or trade-waste team and the City of Perth compliance unit; use the official Water Corporation contact pages for immediate operational incidents.[2]

How-To

  1. Review the Water Corporation Trade Waste Policy and developer connection guidance to confirm applicable limits and required documentation.
  2. Prepare effluent characterisation data and design any required pre-treatment systems to meet the limits and include these in your application.
  3. Submit trade-waste and sewer-connection applications to the Water Corporation and obtain plumbing approvals from the City of Perth where building/plumbing works are involved.
  4. Obtain written acceptance or a trade-waste agreement before discharging; implement monitoring and reporting as required.

Key Takeaways

  • Water Corporation trade-waste rules are the primary source of sewer acceptance limits in Perth.
  • Engage the Water Corporation and City of Perth early in project design to avoid delays or enforcement risk.

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