Illustrations

Our illustrations provide a visual explanation of off mains drainage methods, building subsidence, water service pipe responsibility and drainage pipe responsibility.

Subsidence is the vertical downward movement of a building foundation caused by loss of support of the site beneath the foundations.

It’s a serious problem and has many causes including leaking drains and sewers.

Click here for more detail.

CCM 32400 – Susidance

CCM 32400 – Sewage treatment plant

There are three commonly-used options for when wastewater cannot enter a mains sewage system.

Click here to find out more about cesspits, septic tanks and sewage treatment plants.


When pipes need repairing or replacing, it’s important to know who is responsible for them.

Click here to see illustrations where we explain who is responsible for each water service pipe depending on the type of property.

illustrations page

Drainage misconnection risks illustration

Similar to water pipes, it’s important to know who is responsible for which drainage pipes.

Click here to see illustrations explaining drainage responsibility and drainage misconnection risks.

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