Water Supply (Safety and Reliability) Act 2008

schedule 3, def prohibited substance

1 A solid or viscous substance in a quantity, or of a size, that can obstruct sewerage, or interfere with the operation of sewerage.

Examples of solids or viscous substances that are prohibited substances if of a size or in the quantity mentioned in item 1—

• ash, cinders, sand, mud, straw and shavings

• metal, glass and plastics

• paper and plastic dishes, cups and milk containers whether whole or ground by garbage grinders

• rags, feathers, tar and wood

• whole blood, paunch manure, hair and entrails

• oil and grease

• cement laden waste water, including, wash down from exposed aggregate concrete surfaces

2 A flammable or explosive solid, liquid or gaseous substance, including petrol.

3 Floodwater, rainwater, roof water, stormwater, subsoil water and surface water.

4 A substance that, given its quantity, is capable alone, or by interaction with another substance discharged into sewerage, of—

Example of substance under item 4—

a substance with a pH lower than 6.0 or greater than 10.0, or having another corrosive property

5 A substance at a temperature of more than—