Septic Tanks

Septic Tank Services

Properties not connected to mains sewerage rely on septic tanks for wastewater treatment. Regular maintenance is essential for proper function and legal compliance.

What is a Septic Tank?

A septic tank is an underground chamber where wastewater is treated through bacterial action before draining to a soakaway or drainage field. Solids settle at the bottom (forming sludge), while liquids flow out to the drainage field.

Legal Requirements

Since 2020, septic tanks discharging directly to watercourses are illegal. All systems must either connect to mains drainage or upgrade to compliant treatment plants. General Binding Rules apply to all septic systems.

Essential Services

Regular Emptying

Septic tanks require emptying every 12 months (more frequently for smaller tanks or larger households). A licensed waste carrier removes accumulated sludge using vacuum tankers.

Cost: £150-£300 per empty (depending on tank size and access)

Inspections

Annual inspections check:

• Sludge and scum levels
• Tank structural integrity
• Inlet and outlet condition
• Soakaway function
• Compliance with regulations

Repairs and Maintenance

Common issues include:

• Damaged baffles or dip pipes
• Cracked tank structure
• Failed soakaway systems
• Blocked distribution pipes

Soakaway Replacement

Soakaways eventually fail due to bio-mat formation. Replacement involves excavating and installing new drainage field.

Cost: £2,000-£5,000

Signs Your Tank Needs Attention

• Slow draining fixtures
• Sewage odours
• Pooling water near tank or soakaway
• Lush grass growth over drainage field
• Backing up of wastewater
• Tank hasn't been emptied for over 12 months

Septic Tank Care Tips

• Only flush toilet paper - no wipes, sanitary products, or nappies
• Don't pour fats, oils, or grease down drains
• Avoid excessive water use in short periods
• Don't use excessive bleach or antibacterial cleaners
• Keep vehicles off tank and soakaway areas
• Maintain vegetation away from system
• Keep accurate maintenance records

Conversion to Mains Drainage

If mains sewerage becomes available, you may need to connect. This involves:

• Installation of new connection to main sewer
• Decommissioning existing septic tank
• Filling or removing tank

Cost: £3,000-£7,000 depending on distance to main sewer

Treatment Plant Upgrades

For properties requiring compliant discharge systems, package treatment plants offer modern solutions with mechanical or biological treatment producing cleaner effluent.

Cost: £4,000-£8,000 installed