Stormwater quality targets policy

Policy document number: 083352 Version: 3 Last updated: 4 February 2021

1. Overview

1.1 At a glance

We have stormwater quality targets that your site must meet when discharging to our stormwater service or natural waterways.

1.2 Scope

Our policy applies to you when you connect to, or develop a property that connects to, our stormwater service or natural waterways.

1.3 Objective

Our policy helps us to minimise environmental impacts of urban stormwater run-off. It also helps you understand what devices or systems that improve stormwater quality to install when connecting or developing.

2. Policy in detail

2.1 When do stormwater quality targets apply?

Certain types of development that connect to our stormwater asset or natural waterway must meet our stormwater quality targets. These include (but are not exclusive to):

• residential developments, that are part of a greater subdivision resulting in more than two single, attached or semi-detached dwellings (for example, free-standing houses, duplexes, terraced houses)
• residential development for multi-dwellings or units that are under strata management (for example, townhouses, villas, apartments)
• commercial, industrial and special use (for example, community, education, recreational) buildings or structures
• state significant development or infrastructure.

You may be exempt from meeting these targets if:

• the original total site area is less than 250 m²
• you're refurbishing an existing building and maintaining the existing drainage system.

2.2 What are the Stormwater quality targets?

Stormwater run-off must be of appropriate quality before it enters our stormwater service or natural waterways. You must establish stormwater quality improvement device(s) or treatment trains for your site to meet the following minimum requirements:

Pollutant removal design criteria were adopted by the Western Sydney Growth Centres stormwater guidance for precinct planning in DEC Nov 2006.

2.3 How can you achieve these targets?

You must design and construct stormwater quality improvement devices to achieve these targets for your development. We must approve your design before construction begins.

We may ask you to provide an eWater MUSIC model, demonstrating how your proposed stormwater quality improvement device or treatment trains will meet our stormwater quality targets.

2.4 Who's responsible for the stormwater quality improvement device(s)

Who pays for the system?

Unless otherwise agreed you, the owner or developer, is responsible for all costs.

Who maintains the system?

You, as the property owner, maintain the stormwater quality improvement device or treatment train.

If you connect directly into our owned drainage systems, you must be prepared to enter into a formal agreement with us explaining your maintenance responsibilities.

3. Definitions