How much does commercial tank emptying cost?

Pricing depends on tank size, waste type, and location. A standard grease trap empty typically costs between £150 and £300. Larger septic tanks and cesspits cost more based on capacity. We'll give you a fixed quote before booking - the price we quote is the price you pay.

How often should grease traps be emptied?

It depends on your business volume. Busy restaurants often need weekly or fortnightly emptying. Smaller cafes or pubs might manage with monthly collections. If grease is backing up into your drains, you need more frequent emptying. We can recommend a schedule based on your setup.

How often should septic tanks be emptied?

Most commercial septic tanks need emptying annually, but high-use sites may need more frequent service. We can assess your tank and usage to recommend the right schedule. Regular emptying prevents costly failures and keeps your system working efficiently.

Can you empty tanks at short notice?

Yes. We keep tanker capacity available for urgent jobs. If your tank is full and causing problems, call us - we can often attend the same day or next day. No premium charges for short-notice bookings.

What areas do you cover for tanker services?

We cover the whole of the UK. Our tankers are based across the country, with main hubs in Southern England, which means faster response and competitive pricing.

Do you provide waste transfer notes?

Yes. Every tanker collection comes with full waste transfer documentation as required by law. We're a licensed waste carrier and dispose of all waste at approved facilities. Documentation is provided on the day for your records.

Can you empty tanks outside business hours?

Yes. We understand that tanker visits can be disruptive, especially for customer-facing businesses. We can schedule emptying for early mornings, evenings, or weekends to minimise impact on your trading.

What's the difference between a septic tank and a cesspit?

A septic tank treats waste and discharges liquid to a drainage field. A cesspit is a sealed tank that stores all waste until emptied - no discharge. Cesspits fill up faster and need more frequent emptying. If you're not sure which you have, we can advise when we visit.

Can you set up a regular emptying schedule?

Yes. For businesses that need regular tanker services, we'll set up a scheduled programme. We track when your next empty is due and contact you to arrange access. One less thing for you to manage.

What if you find a problem with my tank?

If we spot damage, capacity issues, or other problems during emptying, we'll let you know and explain your options. We can arrange repairs, recommend upgrades, or advise if the tank needs replacing. Our drainage engineers handle the full range of tank work.

Commercial tanker services

Fast waste removal for cesspits, septic tanks, and grease traps.

Same-day and next-day tanker availability

Grease trap emptying for restaurants and food businesses

Septic tank and cesspit emptying for rural commercial sites

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Why businesses choose OneFlow

based on 180+ Google reviews

No callout fees

You only pay for the tanker service itself. We don't charge extra for site visits or quotes. Straightforward pricing whether it's a one-off or regular service.

Fixed pricing

We quote a fixed price based on your tank size and waste type. No surprises when the tanker arrives, no extras added to the invoice afterwards.

Same-day availability

Tank full and causing problems? We can often get a tanker to you the same day. Our local fleet means faster response when you need waste removed urgently.

Full documentation

Every collection comes with proper waste transfer documentation. Ready for your compliance records, environmental audits, or landlord reporting.

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Most tanks emptied in under an hour

On site, emptied, and documented - with minimal disruption.

98%

Of customers would recommend us.

6000+

Jobs completed last year alone.

Why property managers trust us

Commercial properties off mains drainage need reliable tanker services. Overflowing tanks cause health hazards, business closures, and environmental incidents.

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Scheduled emptying

We'll set up a regular emptying schedule based on your tank size and usage. Never worry about remembering to book - we'll contact you when it's due.

Multi-site coordination

Managing several properties with tanks or grease traps? One point of contact, consistent service, and consolidated invoicing across all your sites.

Why choose a local team?

See how we compare to the big brands.

The big names

What you often get with the big names.

Book weeks in advance or pay emergency premiums

Four-hour arrival windows that waste your day

Driver can't answer questions about your system

Chase them for waste transfer notes

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OneFlow

What you get when you call us.

Same-day availability for urgent jobs

Precise arrival times that respect your schedule

Local team who know tanks and can advise on issues

Documentation provided on the day, every time

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Drainer of the
year 2025

The Drainage Awards

What our customers say

Real reviews from real customers.

“Called at 6am with sewage coming up through the shower. Engineer arrived before 8, fixed it within the hour. Can't thank them enough.”

— James T, Southampton

“Third company I'd tried that week. The other two never showed. OneFlow answered, turned up same day, and actually fixed it. Should have called them first.”

— Michelle R, Brighton

“No messing about. Showed me the camera footage, explained what was wrong, gave me a price, and got on with it. Exactly how it should be.”

— David H, Portsmouth

“Blocked drain on Christmas Eve. Thought we'd be stuck for days. They came out that evening and sorted it. Absolute lifesavers.”
‍

— Sarah K, Guildford

“We've used them for three rental properties now. Always answer the phone, always turn up, always fair on price. Hard to find.”
‍

— Mark L, Bournemouth

“Engineer was honest and said we didn't need half the work another company had quoted for. Saved us hundreds. We'll use them every time now.”

— Karen W, Winchester

“Toilet blocked on the morning of our daughter's birthday party. They had someone here within the hour and sorted it before the guests arrived.”

— Rachel M, Crawley

“Other companies quoted over the phone then doubled it on arrival. OneFlow quoted £180, charged £180.”
‍

— Tom S, Bournemouth

“Drainage issue had been misdiagnosed twice by other firms. OneFlow found the real problem in ten minutes with their camera. Fixed the same day.”

— Angela D, Eastbourne

“Rang at 11pm expecting to leave a voicemail. Actual person answered. Engineer here by midnight. Didn't think companies like this still existed.”

— Chris B, Woking

FAQs

Still have questions?

Get in touch with our friendly support team.

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Need a tank emptied?

24/7 callouts. No callout fees.

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60-minute average response across the UK.

★★★★★ based on 180+ Google reviews