Controlled Waste: The Legal Classification

Under the Environmental Protection Act 1990 and the Controlled Waste (Categories) Regulations 2012, waste from portable toilets — a mixture of human waste, water, chemical additives, and associated detritus — is classified as controlled waste. This classification triggers a range of regulatory obligations that apply to everyone in the waste chain: the generator, the carrier, and the disposer.

The classification is not altered by the fact that the waste is contained within a sealed tank. The moment the waste is generated, the legal framework applies.

The Duty of Care Under Section 34 EPA 1990

Section 34 of the Environmental Protection Act 1990 imposes a duty of care on anyone who produces, imports, carries, keeps, treats, or disposes of controlled waste. This duty requires:

  • That waste is stored safely and in a suitable container
  • That waste is only transferred to an authorised person — a registered waste carrier or a waste disposal authority
  • That a written description of the waste accompanies each transfer
  • That waste transfer notes are completed and retained for at least two years
  • That reasonable steps are taken to prevent escape of the waste

A hirer of portable toilets who allows waste to be collected by a carrier they have not checked is authorised may be in breach of the duty of care. The duty cannot be discharged by ignorance.

Waste Carrier Registration

Under the Controlled Waste (Registration of Carriers and Seizure of Vehicles) Regulations 1991 (as amended), anyone who transports controlled waste in the course of a business or with a view to profit must be registered as a waste carrier with the Environment Agency (or Natural Resources Wales in Wales). The registration must be renewed every three years.

Portable toilet service operators who collect and transport waste from customers' sites must hold this registration. Hirers should:

  • Ask for the carrier registration number before engaging a service operator
  • Check the registration is current on the Environment Agency's public register
  • Retain a record of the registration details

Using an unregistered carrier is a breach of the duty of care under Section 34 EPA 1990. It is also an offence to carry controlled waste without registration — but it is the hirer's responsibility to check.

Environmental Permits for Waste Treatment and Disposal

The Environmental Permitting (England and Wales) Regulations 2016 require that facilities which accept and treat or dispose of controlled waste hold an appropriate environmental permit from the Environment Agency. Treatment works that receive portable toilet waste must hold a permit covering that activity.

This requirement applies whether the disposal is to:

  • A sewage treatment works (which must have a permit or consent covering trade effluent acceptance)
  • A dedicated waste treatment facility
  • An agricultural land spreading operation (subject to separate permit or exemption requirements)

Service operators should be able to demonstrate which facility they use for disposal and confirm that facility holds the appropriate permit. Disposal at an unpermitted facility is an offence under the EPR 2016.

Waste Transfer Notes and Record Keeping

Every transfer of controlled waste between parties requires a waste transfer note (WTN). The WTN must contain:

  • A description of the waste, including its European Waste Catalogue (EWC) code
  • The quantity of waste being transferred
  • The time and place of transfer
  • The names and addresses of both parties
  • The registration or permit details of the carrier and the receiving facility

For regular, repeated collections under the same arrangement, a season ticket (sometimes called a duty of care note) covering up to twelve months is permitted. This reduces administrative burden for long-term hire arrangements.

WTNs must be retained for at least two years by both parties. The Environment Agency can request sight of them during inspection, and failure to produce them can result in enforcement action.

Hazardous Waste Considerations

Most portable toilet waste, particularly from units using modern formaldehyde-free chemicals, is not classified as hazardous waste under the Hazardous Waste (England and Wales) Regulations 2005. However, where older chemical formulations containing formaldehyde or other regulated substances are used, the waste may attract hazardous waste classification, triggering additional requirements including consignment note documentation.

Service operators using older or non-standard chemical formulations should confirm the hazardous waste status of the resulting waste with the Environment Agency.

Exemptions and Agricultural Land

Certain low-risk waste activities are covered by waste exemptions registered with the Environment Agency rather than by full environmental permits. The spreading of septic tank sludge (which may share characteristics with portable toilet waste) on agricultural land is regulated under the Sludge (Use in Agriculture) Regulations 1989 and associated Environment Agency guidance.

This is a specialist area. Service operators who offer land spreading as a disposal route should hold the relevant exemptions or permits and should be able to produce them on request.

What Hirers Should Ask Their Service Provider

  • Are you registered as a waste carrier with the Environment Agency?
  • What is your carrier registration number and when does it expire?
  • Where do you dispose of the waste collected from our site?
  • Does that facility hold an environmental permit for this waste type?
  • Will you provide a waste transfer note for every collection?
  • Do you use formaldehyde-free chemicals in your units?

A service provider that cannot answer these questions clearly and promptly is not one you want collecting waste from your site. The liability for improper disposal does not end with the carrier — it can reach back to you.