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The top 5 reasons why insurers turn down septic tank insurance claims

The five reasons insurers turn down septic tank claims, and how to put a refusal right.

  • Sam WarrenUKDP co-founder
  • Published26 June 2017
  • Updated26 Oct 2026
  • Read time6 min

Key takeaways

  • Insurers turn down septic tank claims because they misunderstand the tanks, rely on their own specialists and opinions, fixate on cause, and overlook exclusions.
  • Septic tanks are technical and underground, and some insurers don't understand them well enough to judge a claim.
  • Insurers appoint loss adjusters or drainage firms to assess claims, and some of these firms recommend refusal more than others.
  • Some refusals rest on a specialist's opinion, such as a tank being too old, that manufacturers and industry bodies don't support.
  • You don't usually need to prove the cause, only that the damage meets your policy's definition of accidental damage.
  • To refuse a claim that meets the policy definition, the insurer must prove an exclusion applies, with evidence and not opinion.
  • If your claim is refused, you can take it to the Financial Ombudsman Service, whose decision binds the insurer.

Most people don’t even realise that, often, the costs of resolving septic tank problems or soakaway problems are covered by standard buildings insurance policies. We’re often called by people looking for a specific septic tank insurance policy, but no such thing really exists, because typically cover is already provided by buildings policies. So, that’s the good news. The not so good news is that insurers aren’t always great at dealing with claims for damaged septic tanks. So, what are the top 5 reasons why insurers turn down septic tank insurance claims? And what should you do if it happens to you?

Here at UKDP, we specialise in helping with insurance claims for damaged septic tanks, soakaways, cesspits and sewage treatment plants. Day in, day out! Yes, it’s pretty niche, but we like to think it makes us pretty clued up on such matters. We know what is and isn’t covered by insurance policies, and importantly we know how to deal with situations when insurers incorrectly turn claims down. Yes, I did say `incorrectly’, because insurers don’t always make the right decision.

How can I prove that? Well, if an insurer turns a claim down, we can take it to the Financial Ombudsman Service for a final decision, which is binding on the insurer. In recent months, we have taken 19 claims which had been declined by the insurers to the Ombudsman, and they have reversed the decisions in 18 of those cases. So that means that in 95% of decisions to decline claims that we have presented, the insurer was wrong to do so. Pretty scary stuff if you ask me. What happens to all those people that don’t have UKDP on their side to champion their cause and get them the cover that their policy should have provided? Septic tanks are not cheap to replace, so this can place a big financial burden on those people who are incorrectly told that they’re not covered.

So, why do insurers turn down septic tank insurance claims?

There are many reasons why insurers decline septic tank insurance claims, although as we’ve established above, they’re often not right to do so. So what are the top 5 reasons?

UKDP engineer inspecting a septic tank

When an insurer rejects a septic tank claim, it is usually the system that is misunderstood, not the policy that excludes it. These are the five reasons behind most refusals, and what tips a claim the other way.

They don’t understand septic tanks

Ok, so the concept of a septic tank seems pretty straightforward and we won’t dwell on it if you’re eating your lunch. But actually, how they work and more importantly why they STOP working can get pretty technical. Least of which because they are underground so no one can see what’s gone on. Some insurers simply don’t understand how it all works, and valid claims can get turned down because of this.

They rely on their own ‘specialists’

Each insurer appoints a company to assess the claim for them. Sometimes this might be a loss adjuster, other times it might be one of a number of drainage companies set up to work for insurers. The problem is that septic tanks are just a small proportion of what these companies do, and, dare we say it, some are more inclined to recommend that claims be turned down than others. Of the 19 complaints we have taken to the Ombudsman in recent months, 17 of them relate to one such specialist company, even though there are 10 companies regularly used by insurers. Sounds a bit dodgy? We think so too.

They rely too much on opinion

We see a number of claims being turned down based on the opinion of these specialists, and the insurer will often support the decision in default, until the Ombudsman tells them that they are wrong. For example, one specialist used by insurers will say that any septic tank beyond a certain age has failed because it’s too old. The problem is that it’s just their opinion, and it’s not supported by manufacturers or any industry bodies.

They get hung up on the ’cause’ of the damage

We have had so many debates with insurers and their representatives about what has caused the damage to a septic tank or soakaway, it’s hard to count them. There are two problems with this. Firstly, it is almost impossible to prove what has happened to a drainage system which is underground, and most people don’t have plans to set up camp in their septic tank, just in case some damage should occur. But secondly and most importantly, for a claim to be valid, you don’t have to prove what’s CAUSED the damage (unless you have a really tricky policy). All you have to prove is that what’s happened to your septic tank or soakaway meets with the definition of `accidental damage’ set down in your policy.

They forget that they need to prove that an exclusion applies

If a customer has demonstrated that their claim meets with the policy definition, the insurer must PROVE that an exclusion within the policy applies if it wants to turn it down. It’s not enough just to provide an opinion, only evidence will suffice. So, for example, if an insurer wants to use the argument that the septic tank is just too old, they have to prove that it is the age of the tank that has caused the system to fail.

Sounds daunting? It can be. Luckily you are already in the right place for help with any septic tank problems or soakaway problems you might be having.

Whether you have noticed that your septic tank needs emptying more frequently than usual, or if you have already had your septic tank insurance claim turned down, we can help.

Frequently Asked Questions

What should I do if my septic tank insurance claim is refused?

Don't take the first ‘no’ as final. Many refusals rest on opinion rather than evidence, and you can challenge them, ultimately through the Financial Ombudsman Service. We help homeowners with claims and know what insurers need to see.

Can I challenge my insurer's decision?

Yes. If you think the refusal is wrong, ask the insurer to review it and then escalate to the Financial Ombudsman, whose decision is binding on the insurer. Evidence from an independent survey often changes the outcome.

Do I need separate septic tank insurance?

No. Damage to a septic tank is normally covered under your buildings policy, usually as accidental damage to underground services, so a standalone product isn't needed. The issue is getting a valid claim accepted, not buying extra cover.

What counts as accidental damage to a septic tank?

Sudden, unexpected damage, such as a vehicle cracking the tank, tree roots breaking in, or a collapsed baffle. Gradual wear and tear or a lack of maintenance usually isn't covered, which is where disputes start.

Will making a claim cost me anything?

Where a claim is accepted, you normally pay only your policy excess.

About the author

Sam Warren

UKDP co-founder

Sam Warren co-founded UKDP with James Warren in 2009 as an off-mains drainage specialist.

Need help with your septic tank or drainage?

Reach out to us on 0800 028 9903. Our team are here to talk Monday to Friday 9am to 5pm.