The 3500 litre precast concrete septic tank Ireland needs from larger homes, agricultural sites, and commercial developments — built right here by Murphy Precast in Enniscorthy, Co. Wexford. At 4,000kg and 3,530mm long, this is not a lightweight plastic alternative you’ll be replacing in a decade. This is heavy-duty precast concrete engineered to last, manufactured to comply with EPA and Irish Building Regulations, and delivered ready to drop straight into your excavation.
If you’ve been searching for a 3500 litre precast septic tank in Ireland that gives you complete confidence in its quality, compliance, and longevity — you’ve found it. Two chambers. Three access lids. 4″ inlet and outlet. Factory-made. Ready to install.
| Specification | Detail |
|---|---|
| Capacity | 3,500 litres |
| Length | 3,530mm |
| Width | 1,509mm |
| Depth | 1,334mm |
| Weight | 4,000kg |
| Chamber Type | 2-chamber (Chamber 1 & Chamber 2) |
| Inlet | 4″ (100mm) |
| Outlet | 4″ (100mm) |
| Access Lids | 3 access lids |
There is a reason engineers, planning consultants, and experienced groundworks contractors across Ireland specify a 3500 litre precast septic tank over plastic alternatives. At 4,000kg, this unit stays put in saturated ground — it will not float, shift, or deform under soil pressure. Concrete is the only material that genuinely stands up to the full range of Irish ground conditions and Irish weather over a 50-year timeframe.
The two-chamber layout is the industry standard for effective septic tank primary treatment. Wastewater enters Chamber 1, where solids settle and begin to break down. Liquid then passes through to Chamber 2 for further settlement before exiting through the 4″ outlet. This staged process significantly reduces solids reaching your percolation area, protecting it and extending its lifespan.
Unlike smaller tanks with just one or two access points, this unit features three access lids — giving your registered de-sludging contractor clear, safe access to both chambers. That means faster servicing, lower labour costs, and no guesswork when it comes to pump-out time. Easy access protects your system investment.
Murphy Precast tanks are delivered ready-to-install with integrated lifting points. Your groundworks team prepares the excavation, and the tank is crane-lowered directly into position — no forming, no pouring, no waiting days for concrete to cure on site. One move and you’re moving to the next stage of the build.
Every Murphy Precast septic tank is manufactured in accordance with EPA guidelines and Irish Building Regulations — the legal requirements for new build planning applications and replacement systems in Ireland. When your planning application lands on the council desk, your wastewater treatment specification is already sorted.
Murphy Precast 3,500 litre two-chamber precast concrete septic tank — 3,530mm L × 1,509mm W × 1,334mm D, 4,000kg. 3 access lids. Manufactured in Enniscorthy, Co. Wexford. Drawing ref: MC0050-1-27.
A 3500 litre precast concrete septic tank in Ireland is most commonly specified for sites where a standard 2,000 litre tank simply doesn’t have the capacity. These include:
| Site Type | Why a Larger Tank Is Needed |
|---|---|
| Large family homes | Higher occupancy means more daily wastewater — a larger tank gives greater treatment capacity and longer intervals between de-sludging. |
| Rural commercial premises | Small businesses, B&Bs, and holiday lettings off mains drainage often require greater capacity to handle variable and higher wastewater flows. |
| Agricultural farm buildings | Staff facilities, milking parlour offices, and farm ancillary buildings off mains drainage require a compliant, robust on-site system. |
| Replacement of older failing systems | Upgrading an old undersized or failing system? Going larger with a 3,500 litre precast unit future-proofs the installation and reduces the frequency of servicing. |
Installing any septic tank in Ireland carries legal obligations. The
Environmental Protection Agency (EPA)
oversees the National Inspection Plan, and local authorities carry out inspections on domestic wastewater treatment systems across the country. Here is what every homeowner, builder, and engineer needs to know:
| Requirement | What It Means |
|---|---|
| EPA Code of Practice 2021 | All new installations must comply with the EPA 2021 Code of Practice for Domestic Waste Water Treatment Systems. Murphy Precast tanks are manufactured to comply. |
| Registration | Register your system with your local authority within 90 days of commissioning via protectourwater.ie. One-off €50 fee — failure to register is an offence with a fine of up to €5,000. |
| Planning applications | New build applications must show site suitability and compliance with Irish Building Regulations (TGD Part H) and the EPA Code of Practice. |
| Regular de-sludging | De-sludging by a registered contractor is required at regular intervals. Keep all receipts for a minimum of five years. |
| Product | Why It’s Often Specified Together |
|---|---|
| ▶ Precast Water Storage Tanks | Off-mains rural homes commonly need both on-site wastewater treatment and a water storage solution — often ordered from Murphy Precast on the same project. |
| ▶ Full Precast Tank Range | View the complete Murphy Precast concrete tank range — including water storage, effluent, and oil interceptor units. |
| ▶ Precast Effluent Storage Tanks | For agricultural or commercial sites requiring dedicated effluent storage alongside wastewater treatment. |
Every site is different. Delivery logistics, ground conditions, access requirements, and programme timing all vary from project to project — which is why we ask you to contact us directly. Our Enniscorthy team will come back to you fast with the information you need to make the right call.
🕕 Old Dublin Road, Kilcannon, Enniscorthy, Co. Wexford Y21AF43
The Murphy Precast 3500 litre precast concrete septic tank measures 3,530mm in length, 1,509mm in width, and 1,334mm in depth. It weighs 4,000kg.
This is a two-chamber tank (Chamber 1 and Chamber 2) with three access lids, a 4″ (100mm) inlet, and a 4″ (100mm) outlet.
Yes. Murphy Precast septic tanks are manufactured in accordance with EPA guidelines and Irish Building Regulations (Technical Guidance Document H), helping ensure the system meets inspection requirements and local authority guidelines for new build planning applications and replacement installations.
The 3,500 litre precast concrete septic tank is ideal for larger family homes, rural commercial premises, agricultural buildings, and properties requiring a replacement for an older or undersized system. It provides greater treatment capacity and longer intervals between de-sludging compared to smaller tanks.
The tank is delivered ready-to-install with integrated lifting points. It is crane-lowered into a pre-prepared excavation by your groundworks team — no on-site forming or curing required. Fast, clean, and precise.
Call +353 53 923 6348, email info@murphyprecast.ie, or use our online contact form. Our team will discuss your site, confirm availability, and advise on logistics for your location.