Professional septic tank replacement, sewage treatment upgrades and off-mains drainage support across the South West

If your septic tank is old, damaged, overflowing, no longer compliant or struggling to cope with your property, Robert Fox & Sons can help.

We provide professional septic tank replacement and sewage treatment plant upgrades for domestic, commercial and rural properties across Devon, Cornwall, Somerset and Dorset. From first inspection through to installation, servicing and ongoing maintenance, our experienced team can assess your current system and recommend the right solution for your property.

Whether you are dealing with a failed tank, a blocked or failing drainage field, unpleasant smells, repeated emptying problems or concerns around septic tank compliance, we offer practical advice and reliable engineering support.

Call Robert Fox & Sons today for septic tank replacement advice across the South West.

Do You Need to Replace Your Septic Tank?

Many older septic tanks continue to operate for years without obvious signs of failure. However, once problems appear, they can quickly become disruptive, unpleasant and expensive if ignored.

You may need a septic tank replacement or system upgrade if you are experiencing:

  • Regular blockages or backing up
  • Foul smells around the tank or drainage field
  • Slow draining toilets, sinks, baths or showers
  • Wet ground, pooling water or sewage surfacing outside
  • A collapsed, cracked or damaged tank
  • A drainage field that is no longer working properly
  • A septic tank that discharges into a ditch, stream or watercourse Issues raised during a property survey or house sale
  • A system that no longer suits the size or use of the property
  • Concerns that your system may not meet current requirements

If you are unsure whether your existing system needs replacing, our team can inspect the site and talk you through the most suitable options.

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Septic Tank Replacement or Sewage Treatment Plant Upgrade?

Not every property simply needs a like-for-like septic tank replacement.

In some cases, the best option may be to replace an old septic tank with a modern sewage treatment plant. This is particularly common where the existing system is no longer suitable, where discharge arrangements need reviewing or where the property requires a more effective long-term wastewater solution.

Robert Fox & Sons can help you understand the difference between:

  • Replacing an existing septic tank
  • Installing a new drainage field
  • Upgrading to a sewage treatment plant
  • Improving an existing off-mains drainage system
  • Servicing or repairing the current setup where replacement is not required

Our approach is practical and site-specific. We do not believe in pushing unnecessary work. We assess the existing system, the property, the ground conditions and the likely usage before recommending the right route forward.

Septic Tank Compliance Advice

Septic tank rules can be confusing, especially for rural homeowners, landlords, holiday let owners and commercial sites.

As a general rule, septic tanks should discharge to ground through a suitable drainage field. A septic tank should not discharge directly into a watercourse such as a ditch, stream or river. Where surface water discharge is involved, a sewage treatment plant may be required instead.

This matters if you are:

  • Selling a property with a septic tank
  • Buying a rural property
  • Dealing with a failed survey
  • Planning building work or an extension
  • Increasing the number of people using the property
  • Running a commercial or holiday accommodation site
  • Unsure where your current system discharges

Robert Fox & Sons can inspect your current setup and provide clear, practical guidance on your options.

Our Septic Tank Replacement Process

1. Initial Advice

We start by understanding the issue. This may include problems with smells, blockages, overflowing, failed drainage, compliance concerns or a recent survey report.

2. Site Visit and Inspection

Our team can visit your property to inspect the existing tank, drainage field, pipework, access and surrounding ground conditions.

3. System Recommendation

We will advise whether your system requires replacement, repair, servicing, a new drainage field or an upgrade to a sewage treatment plant.

4. Installation Planning

Where replacement is needed, we plan the work carefully to minimise disruption and ensure the system is suitable for the property.

5. Septic Tank Replacement or Upgrade

Our experienced engineers carry out the installation using professional equipment and a practical, site-aware approach.

6. Servicing and Maintenance

After installation, we can continue to support the system with servicing, maintenance and emergency call-out where required.

Domestic and Commercial Septic Tank Replacement

Robert Fox & Sons works with both private and commercial customers across the South West.

We support:

  • Rural homes
  • Country properties
  • Farms and estates
  • Holiday cottages and holiday parks
  • Hotels, pubs and restaurants
  • Commercial premises
  • Remote sites
  • Properties without mains drainage
  • Landlords and managing agents
  • Builders, developers and property professionals

Because our background covers electrical, mechanical and water engineering, we can support more than just the tank itself. We understand pumps, controls, filtration, wastewater systems and the practical realities of keeping off-mains drainage working properly.

Septic Tank Replacement Across the South West

We provide septic tank replacement, sewage treatment upgrades and off-mains drainage support across Devon, Cornwall, Somerset and Dorset.

Our service area includes:

Torquay, Paignton, Brixham, Newton Abbot, Exeter, Totnes, Dartmouth, Kingsteignton, Chudleigh and surrounding rural areas across the South West.

If you are outside these areas but still based in the South West, please contact us. We regularly work in remote and rural locations.

Septic Tank Replacement FAQs

Q: How do I know if my septic tank needs replacing?
A: Common warning signs include foul smells, slow drainage, overflowing, repeated blockages, pooling water, sewage surfacing outside or problems raised during a property survey. An inspection can confirm whether the tank needs replacing or whether the issue is with the drainage field, pipework or maintenance.

Q: Can I replace my septic tank with another septic tank?
A: In some cases, yes. However, it depends on the site, ground conditions, discharge location and the condition of the wider system. Some properties may be better suited to a sewage treatment plant upgrade.

Q: What is the difference between a septic tank and a sewage treatment plant?
A: A septic tank separates solids from wastewater and normally discharges treated liquid to ground through a drainage field. A sewage treatment plant provides a higher level of treatment and may be required where discharge conditions are different or where the existing septic tank setup is no longer suitable.

Q: Can a septic tank discharge into a ditch or stream?
A: Septic tanks should not discharge effluent directly into a watercourse such as a ditch, stream or river. GOV.UK guidance states that septic tank effluent should discharge to ground through a drainage field.

Q: Do I need to upgrade my septic tank when selling my house?
A: If your septic tank does not comply with the relevant rules, this may be raised during the sale process. It is sensible to have the system checked before selling a property, especially if the tank is old or discharges to a ditch, stream or other watercourse.

Q: How much does septic tank replacement cost?
A: The cost depends on the size of the system, access, ground conditions, whether a drainage field is required, whether the old tank needs removing and whether a sewage treatment plant is more suitable. A site visit is usually needed before an accurate price can be given.

Why Choose Robert Fox & Sons?

Robert Fox & Sons is a family-owned and run business with many years of experience in electrical, mechanical and water engineering.

Customers choose us because we offer:

  • Professional septic tank replacement and wastewater engineering
  • Domestic and commercial support
  • Practical advice from experienced engineers
  • 24-hour call-out availability
  • Servicing, maintenance and installation
  • Support for remote and rural properties
  • South West coverage across Devon, Cornwall, Somerset and Dorset
  • A friendly, reliable and professional approach
  • Monthly payment plans

We understand that septic tank problems are often urgent, stressful and unpleasant. Our job is to provide clear advice, dependable workmanship and a solution that is right for your property.

Book a Septic Tank Replacement Site Visit

If your septic tank is failing, non-compliant or causing problems, speak to Robert Fox & Sons.

We can inspect your existing system, explain your options and provide professional guidance on the best replacement or upgrade solution.

Call Robert Fox & Sons today for septic tank replacement across Devon, Cornwall, Somerset and Dorset.

📞 Call us on 07577 258113
📧 Email hello@robert-fox.co.uk
or use our contact form to arrange a consultation.