Need help with a blocked drain in Havering? This page connects you with verified, insured plumbers and drainage specialists who clear blocked toilets, sinks, gullies and overflowing drains across Romford, Hornchurch, Upminster, Rainham and every RM postcode.

✅ Checked before listing — identity, insurance, trading presence, Gas Safe (where relevant).
How we verify →
✅ Workmanship guarantee badges on listings — 1, 3, 6 or 12 months

⚠️ Sewage backing up into the home? Keep people and pets away from it, don’t use the affected toilets or sinks, and ventilate. In any property with a gas appliance, if you also smell gas, call the National Gas Emergency Service on 0800 111 999 from outside — full safety steps in Safety first ↓.

→ Find a verified Havering drainage plumber — see the verified list below.

Coverage: RM1, RM2, RM3, RM4, RM5, RM6, RM7, RM11, RM12, RM13, RM14 — Romford, Gidea Park, Collier Row, Harold Hill, Harold Wood, Hornchurch, Elm Park, Upminster, Cranham, Rainham, South Hornchurch and the rural-edge villages.
Blocked drain services covered: blocked toilets, sinks, basins, baths and showers; blocked or overflowing external gullies and soil stacks; slow or smelly drains; drain rodding and high-pressure jetting; CCTV drain surveys; root-ingress and collapsed-drain investigation; and emergency backing-up drains. For urgent blocked drains in Havering, use the verified list above and ask about same-day or out-of-hours availability.
Not sure which page you need? If a pressurised pipe has burst, that’s Burst Pipes; if water’s appearing with no obvious source, Leak Detection; if a toilet runs or won’t flush but isn’t blocked, that’s Toilet Repairs; for food premises and grease management, see Commercial Plumbing.
Costs: see What it costs ↓ for an editorial estimate.
Availability: the verified plumbers listed above set their own hours; many offer same-day or out-of-hours response for backing-up drains.

Jump to: Who’s responsible? ↓ · On arrival ↓ · What’s blocking it ↓ · Surface water & flood risk ↓ · Safety first ↓ · By district ↓ · What it costs ↓ · FAQs ↓

Who is responsible for a blocked drain in Havering?

Before you pay anyone to clear a drain in Havering, it’s worth a minute working out whose drain it actually is — because the answer changes who’s responsible, and in this borough it’s more fragmented than most.

Inside your property, and your own drain, is yours. Thames Water sets out that the pipes inside your home, and the drain that serves only your property up to where it meets the public sewer, are the property owner’s responsibility — that’s where a private drainage plumber comes in.¹ A few quick tells that it’s your blockage: your neighbours aren’t affected, your property doesn’t share a drain, or only your upstairs facilities back up while downstairs is fine.

The public sewer is the water company’s — and which company depends on where you live. Across most of the borough that’s Thames Water, who ask you to report a blocked or overflowing public sewer on 0800 316 9800.¹ But Havering Council states that in parts of Upminster, Cranham and North Ockendon, Anglian Water is responsible for the public foul and surface-water sewers and drains (03457 145 145).² If you’re not sure whether a blockage is public or private, the council notes Thames Water can determine it on site — but be aware they may recharge you for any work that turns out to be on your private drain.³

A blocked road gully or flooded carriageway is the council’s, not the water company’s. Havering Council is responsible for the drains on public roads, which collect run-off from roads and pavements; a blocked or broken road gully should be reported to the council.³ And a blocked river or stream causing flooding is the Environment Agency’s, on 0800 80 70 60.²

That four-way split — your drain / Thames or Anglian sewer / council gully / Environment Agency watercourse — is the single most useful thing to get straight before you book, because it decides whether you’re paying a private plumber at all.

A good drainage plumber doesn’t just start rodding — the first job is to work out where the blockage is and what kind it is. On arrival they’ll typically:

• Lift the inspection chamber (the manhole on your drain run) and look at the water level — a full chamber points to a blockage downstream of it, often towards or in the public sewer; an empty one points back towards the property.
• Check whether neighbours are affected and whether it’s upstairs or downstairs fixtures backing up — both help separate a private blockage from a shared or public-sewer problem.
• Consider the timing — if it only backs up in heavy rain, that can point to surface-water overload rather than a solid blockage (more on that below).

From there, the method follows the diagnosis: rodding or mechanical clearing for a straightforward blockage, high-pressure water jetting for stubborn fat or root build-up, and a CCTV survey where the cause needs seeing — though a camera survey often waits until water levels have dropped enough to see clearly. One Havering access note: in suburban semis and extended houses, the inspection chamber may be paved over, decked, or hidden under an extension, which can affect how quickly a blockage is traced.

What’s actually blocking it

Most domestic blockages come down to what’s gone down the pipe. Thames Water’s guidance is blunt: sewers are designed only for the “three Ps” — pee, poo and paper — plus water from sinks, baths and showers; everything else should go in the bin.¹ The usual culprits:

• Wet wipes — including “flushable” ones, which don’t break down and are a leading cause of blockages and fatbergs.
• Fats, oils and grease (FOG) — poured down the sink as liquid, they cool and solidify, narrowing and eventually blocking the pipe. Thames Water’s advice is to scrape fats and food scraps into the bin and fit a plughole strainer, rather than rinse them away.⁴
• Sanitary items, kitchen roll and cotton products — none of which break down like toilet tissue.
• Hair and soap scum in basin, bath and shower wastes.
• Scale build-up — Havering’s water is hard (Essex & Suffolk Water confirms a hard-water supply area), and over time scale contributes to narrowing in waste pipes and appliance connections.⁵

Beyond what’s flushed, a blockage can be structural: tree-root ingress into older clay drains, a partial collapse, bellied (sagging) pipe runs, or displaced joints — found in the kind of older underground drainage common in many of Havering’s inter-war and post-war homes. That’s when a plumber will run a CCTV drain survey to see the cause rather than just rod it blind, which also matters if you need evidence for an insurer, or to confirm roots or poor fall behind a repeat blockage in the same spot.

Surface water and flood risk in Havering

Blocked drains in Havering don’t sit in isolation — the borough has a genuine, documented surface-water and drainage-flood risk, and a backing-up drain in heavy rain isn’t always a simple blockage.

Havering Council, as Lead Local Flood Authority, identifies surface-water flooding as the most observed flood source in the borough, ahead of sewer and river flooding, and has mapped 15 Critical Drainage Areas where drainage is most under pressure — including the River Rom and Beam catchment, Ingrebourne, Gallows Corner, Elm Park, Cranham, Harold Hill, Ardleigh Green, Heath Park and Rise Park.⁶ The council’s flood investigation after the major August 2020 storms recorded property flooding around specific locations, including Rainham Road and Blacksmith Lane in South Hornchurch and around Clovelly Gardens in Collier Row.⁶

For a homeowner, the practical takeaway is this: in a CDA or after heavy rain, water backing up through a gully or a ground-floor drain may be surface water overwhelming the system rather than a blockage in your own pipe — which is why a good drainage plumber checks whether the problem is your drain, an overloaded public sewer, or a highway-gully issue before charging to clear something that isn’t blocked. Keeping your own gullies, channel drains and downpipe shoes clear of leaves and silt is the part that’s genuinely within your control.

Safety first

Clearing a drain is usually straightforward, but backed-up sewage and confined drainage spaces carry real risks — and a small number of call-outs are in properties where gas is also a factor.

Sewage and wastewater carry bacteria. If foul water has backed up into the home, keep people and pets away from it, don’t use the affected toilets and sinks until it’s cleared, ventilate the area, and wash thoroughly after any contact. Leave confined spaces, deep chambers and manholes to professionals with the right equipment — sewers can contain dangerous gases, which is why specialist teams use gas monitors.

If you smell gas, or suspect a gas leak, follow the Health and Safety Executive’s emergency sequence:

1. Don’t touch electrical switches — on or off — light a naked flame, or smoke.
2. Open doors and windows to ventilate, if it’s safe.
3. If you know where the gas meter control valve is and can reach it safely, turn the gas off at the meter (not if it’s in a cellar).
4. Leave the property if the smell is strong or you feel unwell.
5. Call the National Gas Emergency Service on 0800 111 999 from outside — free, 24/7. National Gas sets out this sequence and will send an engineer to make the situation safe.⁷

Carbon monoxide (CO) is a separate danger — colourless and odourless, produced when a fuel-burning appliance runs badly. A poorly running gas appliance can produce CO. Warning signs include headaches, dizziness, nausea or breathlessness that ease when you leave the house, and a lazy yellow or orange flame instead of crisp blue. If you suspect CO, get fresh air, call 0800 111 999, and seek medical help. Every home with a fuel-burning appliance should have a CO alarm that complies with BS EN 50291 and is sited per the manufacturer’s instructions.⁸

If you rent, your landlord is responsible for keeping the property’s drains, gutters and external pipes in repair, and for the gas appliances and flues they provide, including the annual gas safety check and Gas Safety Record (still often called a “CP12”). The HSE sets out that gas safety duties for landlord-provided gas appliances, flues and pipework remain the landlord’s responsibility, with annual checks on the relevant gas fittings.⁹

Find a verified drainage plumber by district

Havering is an outer-London suburban borough, and its drainage reflects that — older underground clay runs, gardens and gullies, and a documented surface-water flood risk in several areas. Here’s the local picture.

Romford (RM1, RM2, RM7) — town-centre flats above shops with shared soil stacks and waste runs, alongside a wide spread of suburban housing in Gidea Park, Rise Park and Mawneys. Romford sits within the River Rom and Beam catchment, the council’s highest-priority Critical Drainage Area, so a backing-up drain here can be surface water as much as a blockage. Behind the town-centre and Hornchurch food parades, fats, oils and grease can collect in shared rear drainage — so repeat kitchen-waste blockages often need jetting plus grease-management advice rather than repeated sink clearing (see Commercial Plumbing).

Hornchurch & Elm Park (RM11, RM12) — largely 1930s inter-war semis, bungalows and detached houses with older underground drainage and private gullies. Elm Park is a council-listed Critical Drainage Area, so a flooded gully in heavy rain may be an overloaded system rather than a blocked private drain — worth checking before paying to clear it.

Upminster & Cranham (RM14) — suburban semis with larger gardens and longer drain runs, plus the band of Cranham bungalows. This is the part of Havering where a blocked public sewer is Anglian Water’s responsibility, not Thames Water’s — so the same blockage is reported to a different company than in the rest of the borough. Cranham is also a council-listed Critical Drainage Area.

Rainham, South Hornchurch & Beam Park (RM13) — older mixed stock beside new-build Beam Park homes, sitting in the Rom, Beam and Ingrebourne catchments near the Thames marshes. The council’s 2020 flood investigation recorded property flooding around Rainham Road and Blacksmith Lane in South Hornchurch, so drainage here genuinely can be flood-related rather than a simple blockage.

Harold Hill, Harold Wood & Collier Row (RM3, RM5) — post-war estate housing, maisonettes and flats, mid-century houses, and 1930s Collier Row stock with its own recorded flooding history around Clovelly Gardens. In a maisonette block, a toilet backing up in more than one flat points to a shared stack or drain, so a plumber checks neighbouring fixtures and the chamber level before treating it as a single-WC blockage — and may need access to more than one home.

Gidea Park, Emerson Park & the rural edge (RM2, RM4) — larger detached houses with long private drain runs across gardens, and the kind of rear additions and extensions that can put an inspection chamber in an awkward spot. Out toward Havering-atte-Bower, Noak Hill, Corbets Tey and North Ockendon, rural-edge plots can have extended private drainage and older systems — and in parts of North Ockendon the public sewer is Anglian Water’s rather than Thames Water’s. Don’t assume how a property drains; a verified local plumber (often with a CCTV survey) will confirm it.

If you’re near the Romford / Barking & Dagenham boundary at Rush Green, confirm your postcode is RM and within Havering before booking.

What it costs

The figures below are an editorial estimate only, to help you sense-check a quote — they are not regulated rates, not market data, and not a published cost survey. Always confirm the price before work starts, and see how to read a plumbing quote and our London plumbing costs guide.

Havering is outside the central London Congestion Charge zone, but like every Greater London borough it sits inside the London-wide Ultra Low Emission Zone (ULEZ), which the TfL ULEZ scheme operates across all London boroughs (excluding the M25 itself). A non-compliant vehicle may incur the daily charge, so it’s reasonable to ask whether any emissions-zone charge is included in a quote.¹⁰

When you contact a plumber from this directory, you can ask about availability, the call-out charge, whether a CCTV survey is needed, and whether the repair is quoted separately — you’re not obliged to proceed until you’ve agreed the next step. VerifiedPlumbers is a directory that connects you with verified plumbers; it doesn’t carry out the work itself.

Frequently asked questions

Related services in Havering

• Emergency Plumber in Havering — urgent help and out-of-hours make-safe
• Toilet Repairs in Havering — a toilet that won’t flush or runs, rather than a blockage
• Leak Detection in Havering — water appearing with no visible source
• Commercial Plumbing in Havering — food-premises drainage and grease management
• All plumbing services in Havering — the full directory

Related guides

• London Hard Water Guide — how Havering’s hard water scales and narrows waste pipes
• London Plumbing Costs & Compliance Guide 2026 — what plumbing work typically costs and the rules behind it
• London Landlord Plumbing Compliance Checklist 2026 — drainage and repair duties for let properties

A blocked drain is rarely just a blocked drain in Havering — it might be your pipe, an overloaded sewer, a council gully, or surface water in one of the borough’s Critical Drainage Areas. Working out which comes first, before you pay to clear it, is the difference between a £100 job and a wasted call-out. The verified plumbers listed above clear and investigate blockages across every RM postcode in Havering, each one checked for identity, insurance and, where they work on gas, Gas Safe registration.

↑ Find a verified Havering drainage plumber — see the verified list above.

← Back to all plumbing services in Havering

Last reviewed: May 2026 by Adiel Khan — SFEDI-accredited business advisor, 20+ years’ experience (South East Enterprise Ltd) and operator of VerifiedPlumbers. LinkedIn ↗

This page is checked for compliance and regulatory accuracy against the bodies and regulations cited on it — Thames Water, Anglian Water, Essex & Suffolk Water, the National Gas Emergency Service, the Health and Safety Executive, Transport for London and the London Borough of Havering. Source links are provided within this page where relevant.

Sources & further reading

1. Thames Water — Blockages and blocked drains (only the “three Ps” plus sink/bath/shower water belong in sewers; pipes inside the home and the private drain to the public sewer are the owner’s responsibility; report a blocked or overflowing public sewer on 0800 316 9800). https://www.thameswater.co.uk/help/emergencies/blockages
2. London Borough of Havering — Severe flooding advice (Thames Water 0800 316 9800 for foul and surface-water sewers and drains; Anglian Water 03457 145 145 in parts of Upminster, Cranham and North Ockendon; Environment Agency 0800 80 70 60 for main river and coastal flooding). https://www.havering.gov.uk/environmental-issues/hazards-pollution-flooding/8
3. London Borough of Havering — Drains, flooded roads, rivers and streams (council responsible for public-road drains and gullies; report private-drain issues; Thames Water determines public vs private on site and may recharge for private-sewer work). https://www.havering.gov.uk/environmental-issues/hazards-pollution-flooding/6
4. Thames Water — Avoid festive fatbergs (FOG is a leading cause of blockage-related internal flooding; scrape fats into the bin, fit a plughole strainer, flush only the three Ps). https://www.thameswater.co.uk/news/2025/nov/avoid-festive-fatbergs
5. Essex & Suffolk Water — Hard water (confirms a hard-water supply area). https://www.eswater.co.uk/hardwater
6. London Borough of Havering — Severe flooding advice / Local Flood Risk Management (surface-water the most observed flood source; 15 Critical Drainage Areas; recorded 2020 flood locations). https://www.havering.gov.uk/environmental-issues/hazards-pollution-flooding/8
7. National Gas — Emergency contacts (gas-emergency sequence; 0800 111 999, 24/7). https://www.nationalgas.com/emergency-contacts
8. HSE — Domestic gas frequently asked questions (CO alarm to BS EN 50291). https://www.hse.gov.uk/gas/domestic/faqs.htm
9. HSE — Landlords’ responsibility for gas safety (annual checks on landlord-provided gas appliances, flues and pipework). https://www.hse.gov.uk/gas/landlords/
10. Transport for London — Ultra Low Emission Zone (ULEZ operates across all London boroughs, excluding the M25; daily charge for non-compliant vehicles). https://tfl.gov.uk/modes/driving/ultra-low-emission-zone