Pro Drainage Group is the UK’s leading drainage company with over 20 years of experience, installing and emptying thousands of septic tanks every year.
For many homeowners, having a beautiful, green lawn is something to take pride in. It adds kerb appeal, reflects good maintenance, and creates a pleasant outdoor space. However, if you own a septic tank system and notice an area of your lawn that’s significantly greener, thicker, or growing faster than the rest — it might not be a good sign. In fact, it could indicate something is wrong beneath the surface.
At Pro Septic Tanks, we often receive calls from homeowners in Dorset, Wimborne, Romsey, and across Hampshire who’ve spotted unusually lush patches of grass. While it might seem harmless, this visual change can signal underlying septic tank issues that require immediate attention.
In this blog, we’ll explain why grass growing too well over your tank or drain field may be a symptom of a failing or damaged system, what could be causing it, and what you should do next.
Learn MoreYour septic system is designed to process wastewater and dispose of it safely through a soakaway or drain field. This process happens underground, and ideally, you shouldn’t see or smell any evidence of it above ground. But when there’s a malfunction — such as a leaking tank, clogged pipes, or drain field saturation — the nutrient-rich effluent may begin to seep up into the surrounding soil.
This wastewater contains high levels of nitrogen and phosphorus — both of which act as fertiliser. The result? A sudden burst of growth that creates thick, bright green grass directly above or near your septic tank or soakaway area.
If one part of your lawn looks like a patch of perfectly manicured grass while the rest is dry or patchy, it’s time to investigate.
Learn MoreIt’s tempting to dismiss a healthy-looking lawn as a positive thing — but in this context, it can spell disaster. Ignoring lush grass over a septic tank can lead to:
Health risks: Leaking waste can contaminate your garden soil, putting pets and children at risk.
Environmental damage: Effluent may reach groundwater, streams, or neighbouring properties.
Property damage: If the tank fails entirely, it can lead to expensive landscaping, structural repair, and even legal liabilities.
Acting quickly can save you from serious and costly damage. Booking a septic tank inspection at the first sign of trouble could help prevent thousands of pounds in repair bills.
Get in TouchIf you suspect your lawn is growing unusually well above your septic system, don’t delay. Here are the steps we recommend:
Book a septic tank inspection — A professional inspection will identify the cause, whether it’s a leak, overflow, or drain field issue.
Schedule septic tank cleaning or pumping — Even if your system isn’t leaking, it may be full. Routine septic tank emptying in Dorset helps prevent problems before they start.
Check for cracks or wear — A full diagnostic check of your system will help uncover any structural damage.
Get professional repairs — If damage is found, search for septic tank repairs near me to address it promptly.
Consider replacement or new installation — If your system is outdated, septic tank installation in Hampshire or Dorset may be a long-term solution.
At Pro Septic Tanks, we provide trusted, professional services across Dorset, Wimborne, Romsey, and Hampshire. Whether you’re dealing with emergency issues or planning preventative maintenance, we’re here to help.
We’re proud to be a local, reliable name in the industry — offering fast, friendly, and thorough solutions to your septic problems.
Contact usThat patch of lush, vibrant grass might seem like a gardening win — but for homeowners with septic tanks, it can be an early warning sign. Leaks, overflows, or system failures can cause waste to escape, fertilising your lawn while creating serious risks beneath the surface.
If you’ve noticed unusually healthy grass in your garden, don’t wait for the problem to escalate. Contact Pro Septic Tanks for an expert assessment and reliable solution. Our team is here to protect your home, your health, and your peace of mind.
Get in Touch Today