How to obtain trade effluent consent for chemical discharge

To legally discharge salon chemicals like hair dye, bleach, and cleaning agents into the public sewer, you must contact your local water and sewerage company to obtain a trade effluent consent. This is a legal requirement under the Water Industry Act 1991, and operating without one can lead to significant fines or even prosecution.

What is trade effluent?

In simple terms, "trade effluent" is any liquid waste that is discharged from a business premises, excluding domestic sewage (toilets and sinks used for standard hygiene) and rainwater. For a hair salon, this includes the water from your backwash units that contains chemical residues from dyes, lighteners, and treatments.

Step-by-step: How to get consent

1. Identify your water wholesaler: Your water bill will show who provides your sewerage services (e.g., Thames Water, Severn Trent, or United Utilities). Note that this is the company that owns the pipes, not necessarily the company you pay for your billing.
2. Make an initial enquiry: Contact the wholesaler's trade effluent department. Not every small salon will require a formal, written consent if the volume of discharge is very low, but you must get this confirmed in writing. Large salons or those with high-volume chemical use almost certainly will.
3. Complete the application form: If they determine you need consent, you will need to fill out a formal application (often called a G02 form). You will need to provide:
   • The nature and composition of the chemicals you use.
   • The maximum volume of waste you expect to discharge per day.
   • The rate at which the waste will be discharged (litres per second).
   • A map of your salon's internal drainage layout.
4. Site inspection: The water company may send a Trade Effluent Officer to visit your premises to inspect your setup and explain your responsibilities.
5. Receive your document: If approved, you will be issued a "Consent to Discharge." This document will list specific limits on what you can pour down the drain and may include requirements for sampling or monitoring.

Costs and maintenance

Most water companies charge an application fee to process your request. Once your consent is active, you will usually pay a "trade effluent charge" as part of your regular water bill. This is calculated based on the volume and "strength" (how hard it is to treat) of the waste you produce.

Do	Don't
Keep copies of all your chemical Safety Data Sheets (SDS).	Pour undiluted, leftover hair dye directly down the drain.
Install "hair traps" in washbasins to prevent physical blockages.	Assume your landlord has already sorted this for you.
Notify the water company if you significantly increase your services.	Wait for an inspection to find out you're breaking the law.

Pro Tip: Using eco-friendly or highly biodegradable hair products can sometimes reduce the "strength" of your effluent, which may lead to lower discharge costs over time.

Why is this important?

Public sewers are designed to handle domestic waste. Chemicals from salons can react with other substances in the pipes, cause "fatbergs," or damage the delicate biological processes used at water treatment plants. By obtaining consent, you are proving that your business is environmentally responsible and protected against legal disputes.