Most landlords file Legionella under “health and safety” - an HSE duty, satisfied by a risk assessment kept in a drawer. That is only half the picture. Housing law gives your tenant, and your local council, a separate route to act on the same water risk, and it does not depend on the HSE getting involved at all.

That second route runs through two things named in housing law rather than safety law. The Homes (Fitness for Human Habitation) Act 2018 lets a tenant in England take a landlord to court if the property is not fit to live in. The Housing Health and Safety Rating System (HHSRS) is what local-authority environmental health teams use to assess hazards in residential property. A poorly controlled Legionella risk can, in principle, be looked at through both.

This article explains how that housing-law dimension sits alongside the duty you already know about - and why the paperwork that protects you is largely the same.

Two duties over one hazard

Under the Health and Safety at Work etc. Act and the Approved Code of Practice L8, a landlord who lets residential property has a duty to assess and control the risk of exposure to Legionella for tenants [1][2]. The HSE is the enforcing authority for that duty, and its landlords’ guidance is clear that the core expectation is a competent risk assessment and proportionate control, not routine testing of every home [1].

Housing law is a different lever. It is enforced by local-authority environmental health, not the HSE, and it is concerned with whether a dwelling is fit and free from serious hazards for the people living in it. The same uncontrolled water system can therefore attract attention from two directions: a safety regulator on one side, and a housing enforcer - or the tenant themselves - on the other.

In my experience landlords fixate on the first and never hear about the second until a tenant complaint lands.

How the Homes (Fitness for Human Habitation) Act changes the tenant’s hand

The Homes (Fitness for Human Habitation) Act 2018 amended the implied terms of most residential tenancies in England, so a property must be fit for human habitation at the start of, and throughout, the tenancy. The shift that matters is who can act. The tenant can bring a claim directly in the civil courts, without waiting for the council or the HSE to step in.

Fitness is judged against a list of matters that includes prescribed hazards - the same hazard categories environmental health works with. Where a water system created a serious, foreseeable health risk that a reasonable landlord should have controlled, that is the kind of issue a court could weigh when deciding whether a dwelling was reasonably suitable for occupation. I am describing the shape of the route, not predicting an outcome. Whether any given Legionella situation makes a home unfit is a fact-specific question for a court, and it turns on the actual risk and on what the landlord did about it.

This is also where a tenant disrepair Legionella complaint can overlap with fitness. Disrepair and fitness are different legal tests, but a tenant raising water-system concerns may put both in play at once.

Where HHSRS comes in

The HHSRS is the risk-based system a local authority uses when it inspects housing and rates the hazards it finds. If an environmental health officer responds to a complaint and judges that a water system presents a meaningful risk, that can be assessed as a hazard and may lead to enforcement - for example a notice requiring improvement works.

I am deliberately not quoting any HHSRS scores or bands. The scoring method is technical, the officer applies it to the specific property, and the headline for a landlord is simpler than the maths: a council has its own powers over an HHSRS Legionella hazard in a let home, separate from anything the HSE does.

What nobody tells you about the two-route problem

Here is the part that rarely makes it into landlord guidance.

The reason most landlords feel safe is that the HSE almost never inspects an ordinary rented house. That is true, and it lulls people into treating Legionella as a box-ticking formality. But it measures the wrong risk. For a single let property, the realistic trigger is not an HSE visit. It is a tenant who is unwell, worried, or in dispute, who complains to the council or speaks to a solicitor. At that point a different enforcer with different powers - environmental health, or a civil court under the Homes Act - is looking at your water system, and the HSE’s absence is beside the point.

The second non-obvious point is that all three routes converge on the same evidence. The HSE, an environmental health officer, and a county court judge will each ask a version of the same question: was there a current, competent assessment of the Legionella risk, and did the landlord act on what it said? A landlord with a sensible, dated risk assessment and a record of acting on it is well placed in front of any of them. A landlord with nothing is exposed to all three at once - and the housing-law routes are the ones a tenant can pull without anyone’s permission.

So the practical defence is not “which law applies”. It is the one piece of paper that answers all of them.

What to actually do

You do not need a separate compliance regime for housing law. You need to do the HSE-side basics properly and keep the evidence:

  • Hold a current Legionella risk assessment for the property, carried out by someone competent, and review it when things change [1].
  • Act on what it recommends, and record what you did - relevant temperatures, any remedial work, and advice given to tenants.
  • Tell tenants how to reduce risk in plain terms: run little-used taps and showers, keep shower heads clean and descaled, and report water that runs cool when it should be hot. Document that you told them.
  • Pay attention at the gaps. Change of tenancy, void periods and long vacancies are when systems stagnate and complaints later cluster.

For the wider duty and how it applies to ordinary tenancies, see Landlord responsibilities for Legionella in rental properties and Legionella control in residential rental properties. If you let through a portfolio or registered provider, Legionella compliance for social housing and housing associations covers the social-housing overlay, and shared houses carry their own licensing dimension in Legionella duties in HMOs: licensing, shared systems and what you must do.

A note on scope. This is general guidance, not legal advice. The Homes Act applies to England, and Scotland, Wales and Northern Ireland have their own housing standards. Fitness and HHSRS determinations are made by courts and councils on the specific facts of a property. For your own position, rely on a competent, site-specific risk assessment, and on the housing-law specifics take proper legal advice.

FAQ

Does the Homes Act mean I have to test the water for Legionella?

No. The housing-law route does not impose a testing rule, and the HSE’s landlord guidance is explicit that routine sampling is usually unnecessary in domestic-type systems [1]. What matters is a competent risk assessment for the property and evidence that you acted on it.

Can a tenant take me to court over Legionella without the council or HSE?

Under the Homes (Fitness for Human Habitation) Act 2018 a tenant in England can bring a fitness claim directly, so in principle yes, without waiting for a regulator. Whether a particular Legionella situation actually makes a dwelling unfit is for the court to decide on the facts.

Is HHSRS the same as the HSE Legionella duty?

No. The HHSRS is a housing-assessment system used by local-authority environmental health, while the HSE Legionella duty sits under health-and-safety law. Both can apply to the same property, with different enforcers and different powers.

Does any of this apply outside England?

The Homes (Fitness for Human Habitation) Act applies to England. Scotland, Wales and Northern Ireland operate their own housing fitness and repair standards. The underlying Legionella duty under health-and-safety law applies across Great Britain [2].

Start here this week

Pull your most recent Legionella risk assessment for the property and check two things: its date, and whether you actually carried out what it recommended. If you cannot lay hands on one, commission a competent assessment now - that single, current, acted-on document is what answers a tenant, a council officer and the HSE alike.

Sources

[1] HSE, “Legionella and landlords’ responsibilities”. https://www.hse.gov.uk/legionnaires/legionella-landlords-responsibilities.htm [2] HSE, “Legionnaires’ disease - what you must do”. https://www.hse.gov.uk/legionnaires/what-you-must-do/index.htm