Rules & Regulations
General Binding Rules Explained
What the General Binding Rules actually require for septic tanks and treatment plants, in plain English.
In short: the General Binding Rules (GBR) are a set of conditions introduced in England in 2020 that let most small septic tank and treatment plant discharges operate without an individual permit — provided they meet specific conditions. Meet the conditions and you’re covered automatically; fall outside them and you typically need a permit or a system change.
What counts as a “small sewage discharge”
The GBR apply to discharges of less than 5 cubic metres a day (roughly what a typical household produces) that don’t go through a public sewage treatment works — in other words, most domestic septic tanks and treatment plants.
The core conditions
To be covered by the GBR without a permit, your system generally needs to:
- Discharge to a drainage field (for septic tanks) rather than directly to surface water, or discharge suitably treated effluent (for treatment plants) that meets the relevant standard
- Be located an appropriate distance from watercourses, wells, boreholes and property boundaries
- Not be within a groundwater Source Protection Zone 1 without meeting additional conditions
- Be properly maintained and not cause pollution
- Not serve more than the equivalent of a small number of properties (beyond which different rules apply)
The most common way people fall outside the GBR
By far the most common issue is a septic tank (not a treatment plant) discharging directly to a ditch, stream or other watercourse — septic tanks don’t treat effluent thoroughly enough for this to generally be permitted. See our dedicated guide: septic tank discharging to a ditch.
What happens if you don’t meet the conditions
You’ll typically need to either bring the system into compliance (adding a drainage field, or upgrading to a treatment plant) or apply to the Environment Agency for an individual permit. See non-compliant septic tank for what this looks like in practice.
Do the General Binding Rules apply everywhere in the UK?
No — they’re specific to England. Scotland (via SEPA), Wales (via Natural Resources Wales) and Northern Ireland (via NIEA) have their own, broadly similar but not identical, regulatory frameworks.
Do I need to apply for anything if my system meets the General Binding Rules? + −
No — that's the point of the GBR. If your system meets the conditions, you're covered automatically without needing to register or apply for a permit.
How do I know if I'm in a groundwater Source Protection Zone? + −
The Environment Agency publishes maps of Source Protection Zones, and a specialist survey can confirm this as part of assessing your system.
Were the General Binding Rules always in place? + −
The current rules took effect on 1 January 2020, replacing an earlier registration-based system — which is why systems installed or unchanged since before then sometimes need reassessing.
Sources
- Environment Agency — General binding rules: small sewage discharges to the environment