Libra provides septic tank emptying in Sevenoaks and the surrounding area, using licensed vacuum tankers, fully documented waste disposal and appointments booked around you. Whether you need a one-off empty, an emergency call-out or a regular scheduled service, we can get a tanker to you.
The Darent valley and the villages along the foot of the North Downs contain a high number of large private properties on their own drainage. Shoreham, Eynsford, Knockholt, Chevening, Ightham and the lanes around Westerham and Brasted are all well outside the sewer network.
We do the job properly and leave you with the paperwork to prove it. Every Sevenoaks visit includes:
• A full empty — sludge, surface crust and liquor removed from every chamber, not a skim off the top.
• A visual inspection of the chambers, dip pipes or baffles and the inlet and outlet, so you know the condition of the tank.
• An honest assessment of your drainage field — if the soakaway is failing, emptying alone will not fix it and we will tell you.
• Licensed disposal — the waste is taken away by a registered waste carrier to a permitted treatment site.
• A duty of care waste transfer note for your records, every single time.
• A recommended next-empty date based on what we actually find in your tank.
We cover Sevenoaks itself and the villages and hamlets around it, including Otford, Kemsing, Ightham, Seal, Shoreham, Eynsford, Westerham, Brasted, Chevening, Knockholt, Halstead, Dunton Green, Borough Green, Wrotham and Chipstead. Our tankers work across the TN13, TN14 and TN15 postcode areas.
If your property sits just outside that list, call us anyway — we regularly work a fair distance beyond our core patch, and if we are already in the area we can often fit you in the same day.
The usual guidance is at least once a year, and under the General Binding Rules an annual empty is effectively the minimum standard unless the manufacturer specifies otherwise. In practice, the right interval depends on the size of your tank, how many people live in the property, how much water you use, and how well the drainage field is coping.
Sevenoaks sits on greensand with chalk downland to the north and the Darent cutting through it. Ground conditions vary sharply over short distances – free-draining on the chalk and greensand, much heavier in the valley bottom.
| Property / system | Typical interval | Why |
| 1–2 people, standard 2,700–3,000 litre septic tank | 12–18 months | Low daily flow, solids build slowly |
| 3–4 people, standard septic tank | 9–12 months | The most common domestic scenario |
| 5+ people, or heavy water use | 6–9 months | Higher flow reduces settlement time |
| Property on heavy clay or with a high water table | 6–9 months | Poor percolation keeps liquid levels high |
Cesspool/cesspit (sealed, no outlet) | 4–8 weeks | Nothing leaves the tank — it fills at the rate you use water |
| Package treatment plant | 6–12 months de-sludge | Follow the manufacturer’s schedule |
| Holiday let, campsite or seasonal use | Seasonal schedule | Heavy summer load, light winter load |
These are guides, not guarantees. After your first visit we will give you a realistic interval based on what was actually in the tank.
Drains and toilets running slowly throughout the property, not just in one place.
• Gurgling from sinks, baths or toilets when other water is running.
• A sewage smell near the tank, the manhole covers or the drainage field.
• Standing water, boggy ground or unusually lush green grass over the soakaway.
• The liquid level in the tank sitting above the outlet pipe.
• Waste backing up into the lowest fitting in the house — usually a ground-floor shower or toilet. • It has simply been more than twelve months since the last empty.
If waste is backing up indoors, stop using water and call Libra on 01634 562 222. Every flush, shower and washing machine cycle adds to a tank that has nowhere left to put it.
Since January 2020, the General Binding Rules for small sewage discharges in England have made it clear that a septic tank must not discharge to a ditch, stream, river or any other surface water. It must discharge to ground through a properly functioning drainage field. If your tank still discharges to a watercourse, it has to be replaced or upgraded — and if you sell the property, that is normally dealt with before completion.
The rules also require the system to be maintained properly: emptied at least once a year, or as often as the manufacturer specifies, by a registered waste carrier — and you are expected to keep the records that prove it.
The River Darent is a chalk stream, a rare and highly sensitive habitat, and the surrounding downland is a Source Protection Zone. Chalk streams have very low tolerance for nutrient input, which is why discharges to them are treated so seriously.
Libra is a registered waste carrier. Every empty we carry out is disposed of at a permitted site and comes with a duty of care waste transfer note. Keep them somewhere safe: they are what you produce if the Environment Agency asks, and what a buyer’s solicitor will ask for when you come to sell.
When you book with us, you deal with the people who turn up.
• Local to Kent — we know the ground, the lanes and the access problems around Sevenoaks.
• Registered waste carrier — licensed disposal and a waste transfer note on every job.
• All systems covered — septic tanks, cesspools and cesspits, and package treatment plants.
• Straight advice — if the real problem is a failed soakaway, we say so rather than selling you repeat empties.
• Scheduled reminders — we can put you on an annual or six-monthly cycle and contact you when it is due, so it never becomes an emergency.
• Emergency response — same-day and next-day availability for tanks that are overflowing or backing up.
• Fully insured — public liability cover on every visit.
At least once a year as a baseline. Depending on your household size, tank capacity and how well the drainage field copes with local ground conditions, properties around Sevenoaks often need emptying every six to twelve months. We will give you a realistic interval after the first visit.
A standard domestic septic tank empty usually takes 30 to 60 minutes on site. A larger tank, a long hose run or a badly overdue tank will take longer.
If waste leaves the tank and soaks away into the ground, it is a septic tank. If nothing leaves and the tank simply fills, it is a cesspool – and it will need emptying far more often, sometimes monthly. Our driver can tell you which you have on the first visit, and we will set a realistic schedule from there.
Not necessarily, as long as we have clear access to the tank and the manhole covers, and somewhere to park the tanker. Many customers leave a gate unlocked and we send the paperwork afterwards.
It is taken away by a registered waste carrier to a permitted treatment site, and you receive a duty of care waste transfer note recording exactly where it went.
Yes. We hold capacity for urgent jobs and can usually attend the same day or next day. If waste is backing up into the property, stop using water and call us straight away.
Getting a tanker booked is simple. Call Libra on 01634 562 222, or email enquiries@librautility.services with your postcode, rough tank size and whether this is routine or urgent. We will confirm a price and a slot, turn up when we say we will, empty the tank properly and leave you with the paperwork.
