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General Binding Rules


General Binding Rules: Small Sewage Discharge To The Ground

How to meet the general binding rules if your septic tank or small sewage treatment plant releases (discharges) waste water to the ground.

This Information Applies to England

Contents

1.     Overview

2.     Existing discharges: what this means

3.     New discharges: what this means

4.     Rules for existing and new discharges

5.     New discharges: additional rules

6.     More information on the rules

7.     If you cannot meet all of the rules that apply to you

8.     Enforcement

Overview

If you’re the operator of a septic tank or small sewage treatment plant, you will not need a permit if you meet all of the general binding rules that apply to you.

The full set of rules are summarised in the publication Small sewage discharges in England: the general binding rules.

This guide explains which of the rules you must meet if you discharge waste water to the ground.

The rules to meet depend on whether the discharge is ‘existing’ or ‘new’.

You must also have the other permissions that you need to discharge to the environment legally, including:

Existing discharges: what this means

You have an existing discharge to ground if all of these points apply to you:

If so, check if you can meet the general binding rules for existing discharges. You will not need an environmental permit if you can.

New discharges: what this means

You have a new discharge to ground if you either:

If so, check if you can meet all of the general binding rules for existing discharges, plus the additional rules for new discharges. You will not need an environmental permit if you can.

Rules for existing and new discharges

Rule 1: Only discharge 2 cubic metres or less a day in volume 

For sewage from a residential property, use the daily discharge calculator to work out how much you discharge a day.

For commercial properties (such as a hotel, restaurant or office) or holiday accommodation (such as a cottage or chalet), use British Water’s Flows and Loads guidance. You will need to add all sources of flow together.

If you discharge more than 2 cubic metres (2,000 litres) a day to ground you must connect to the public foul sewer when it’s reasonable to do so. You must apply for a permit if it’s not.

Rule 2: Only discharge domestic sewage

The sewage must be domestic in nature, for example from a toilet, bathroom, shower or kitchen of a house, flat or business (such as a pub, hotel or office).

Find out more about what the definition of domestic sewage includes.

Rule 4: Do not cause pollution of surface water or groundwater

The sewage must not cause pollution – find out how to check for pollution.

Rule 5: Use the correct treatment system

You must use a septic tank or a small sewage treatment plant to treat the sewage and then discharge the waste water to ground through a drainage field.

A septic tank is an underground tank where the solids sink to the bottom, forming a sludge, and the waste water flows out to a drainage field.

A small sewage treatment plant, also known as a package treatment plant, works in a similar way to a septic tank but uses mechanical parts to treat the waste water to a higher standard before it goes to a drainage field.

A drainage field, also known as an infiltration system, is a series of pipes with holes placed in trenches and arranged so that the waste water can trickle through the ground for further treatment.

The system you use must meet the relevant British Standard.

Discharges through drainage mounds can meet the general binding rules as long they are not in floodplains and they are located, designed and constructed in line with the recommendations in British Standard BS 6297:2007.

If you use a non-standard system (such as a well, borehole and soakaway)

You cannot meet the general binding rules if you are using:

Instead you must either:

Do not create or use a new discharge to ground through non-standard systems such as boreholes, shafts, concrete rings or similar structures. These are not appropriate ways of disposing of sewage under the general binding rules because of their increased risk of pollution.

If your sewage effluent discharges directly to groundwater (at any time of year) through any of these non-standard systems:

This is explained in section G of the Environment Agency’s approach to groundwater protection.

Rule 7: Make sure the discharge is not in a groundwater source protection zone 1

To prevent groundwater pollution you must check if the discharge point is in a groundwater source protection zone 1 (SPZ1).

A groundwater SPZ1 can be the area around a commercial water supply used for drinking water or food production. To check if your discharge is in the inner zone (zone 1) you can either:

A groundwater SPZ1 can also be any area within 50 metres of a private water supply for human consumption. Ask your neighbours if they have one and, if so, how far their spring, well or borehole is from your drainage field.

If an existing discharge or a new discharge to the ground is in a SPZ1

If the discharge point is in a SPZ1 (except SPZ1c) you must apply for a permit. A permit will include additional conditions to the general binding rules.

The Environment Agency will grant the permit if either:

If there’s evidence of pollution or the risk of pollution is unacceptable the Environment Agency will ask you to make changes to your system and may issue a permit with improvement conditions.

The Environment Agency regularly checks:

If the Environment Agency finds your system may be causing pollution to surface or groundwater they will contact you to discuss the issues. This may result in them reviewing or revoking your permit. Follow the guidance on how to comply with your permit.

Rule 9: Make sure your treatment system meets the right British Standard

Your system must meet the relevant British Standard that was in place at the time it was installed.

If different parts of your treatment system were installed at different times, each part must meet the relevant British Standard in place at the time of installation.

The current standards for new systems are:

How to check if your treatment system met the British Standard

Your septic tank or treatment plant met the British Standard in place at the time of installation if:

You can also ask the company that installed your equipment to confirm that it met the British Standard in place at the time of installation.

If your treatment system was installed before 1983 you do not need to do anything to meet the British Standard. There was no British Standard in place before then. You must still meet the other general binding rules that apply to you.

Rule 10: Make sure your treatment system is installed and operated correctly and has enough capacity

Your treatment system must be large enough to handle the maximum amount of sewage it will need to treat.

If you install a new septic tank, small sewage treatment plant or drainage field you must check with the installer that it meets the sizing requirements in British Water’s Flows and Loads guidance.

Your treatment system must be installed and operated in line with the manufacturer’s specification. This is the instruction manual or technical set of requirements that comes with the equipment.

If the amount of sewage the system needs to treat increases

You must make sure the treatment system is still big enough. For example, this could be if you extend your property or connect to an another property. You must recalculate the maximum daily volume of your discharge.

If you discharge more than 2 cubic metres (2,000 litres) a day to ground you must connect to the public foul sewer when it’s reasonable to do so. You must apply for a permit if it’s not.

Rule 11: Get your treatment system regularly maintained

You should have your treatment system regularly maintained in line with the manufacturer’s instructions. If these are not available, ask your local maintenance company for advice.

You must have your treatment system repaired or replaced if it is not in good working order. For example, this could be if it has:

Anyone who carries out maintenance on your system must be competent. Competent people include those on British Water’s list of accredited service engineers.

If you change your treatment system, check if it’s now classed as a new discharge.

Rule 12: Get your treatment system regularly emptied

You must get the sludge that builds up in your septic tank or sewage treatment plant removed (desludged) before it exceeds the maximum capacity. As a minimum, you should have your treatment system desludged once a year or in line with the manufacturer’s instructions.

The company you use to dispose of your waste sludge must be a registered waste carrier. You can find this out by either asking the:

Rule 13: You sell your property: tell the new owner about the sewage treatment system

If you sell your property, you must tell the new operator (the owner or person responsible for the septic tank or small sewage treatment plant) in writing that a sewage discharge is in place.

Include:

Rule 14: You stop using your treatment system: make sure it’s decommissioned properly

You must remove anything that could cause pollution (for example, remaining sludge) when you stop using a septic tank or small sewage treatment plant.

This does not apply if you only stop using the equipment temporarily, for example if your property is empty.

You can ask a maintenance company for advice on how to decommission your septic tank or treatment plant properly.

New discharges: additional rules

Rule 15: Check if you can connect to a nearby public foul sewer

If you connect to a public foul sewer:

To find out if there is a public foul sewer near your property, contact your local water company.

For a single domestic property

You cannot meet the general binding rules if there’s a public foul sewer within 30 metres of any boundary of the premises that your system serves.

If you’re building a development of more than one property

Multiply the number of houses by 30 metres.

Example

If there are 3 properties then this will give you a distance of 90 metres (3 × 30 metres).

You cannot meet the general binding rules if any boundary of the premises that your system serves is within that distance of a public foul sewer.

If some or all of your discharge is from non-domestic properties

Divide the maximum volume in cubic metres that you want to discharge from those other premises by 0.75 (1 cubic metre is 1,000 litres). Multiply the result by 30. This will give you a result in metres.

Example 

A discharge of 1.2 cubic metres divided by 0.75 gives 1.6, which multiplied by 30 gives a result of 48 metres.

You cannot meet the general binding rules if any boundary of the premises that your system serves is within that distance of a public foul sewer.

If your discharge is in a sewered area

Check what you need to do if your discharge is in a sewered area.

If there is no public foul sewer, check if your sewerage undertaker has a duty to provide first time sewerage.

Rule 16: Get building regulations and planning approval

You must have building regulations approval if you have or are planning to install a new septic tank or small sewage treatment plant. You may also need planning permission.

Rule 17: Make sure the discharge point is not in or near protected sites

You cannot meet the general binding rules if the new discharge will be in an ancient woodland or in or within 50 metres of any:

If you have or are planning to start a new discharge to ground in or near a protected site, you must connect to the public foul sewer when it’s reasonable to do so. You must apply for a permit if it’s not.

How to check the locations of protected sites

You can use Magic map to identify the locations of these sites.

1.    Search for the discharge site location.

2.    In the table of contents, open ‘Designations’, then ‘Land-Based Designations’, then ‘Statutory’. Select ‘Sites of Special Scientific Interest (England)’, ‘Special Protection Areas (England)’, ‘Special Areas of Conservation (England)’ and ‘Ramsar Sites (England)’.

3.    In the table of contents, open ‘Habitats and Species’, then ‘Habitats’, then ‘Woodland’ option. Select ‘Ancient Woodland (England)’.

4.    To measure the distance from the discharge site to any protected sites, select the ‘Measure’ tool from the menu then use the ‘Distance’ option.

5.    To find out if a site is a biological SSSI, select the ‘Identify’ tool from the menu, then select the protected site on the map. Open the site detail link to read the description.

If you cannot use Magic, contact the Environment Agency to request a nature and heritage conservation screening.

More information on the rules

You should get advice from a competent service engineer if you need help understanding:

British Water provides a list of accredited service engineers. There may be other competent service engineers.

There’s also guidance on how to meet the general binding rules if your septic tank or small sewage treatment plant discharges to a surface water.

If you cannot meet all of the rules that apply to you

You must either:

If you cannot change your system and it’s not reasonable to connect to a public foul sewer, then you must apply for a permit. In your application you must justify why it’s not reasonable to connect to a public foul sewer. The Environment Agency will then assess the risk of using your system at your location.

Enforcement

If your discharge causes pollution you may be committing an offence. The Environment Agency will give you advice to help you fix the problem. If your discharge continues to cause pollution the Environment Agency may take enforcement action against you.


 General Binding Rules

General Binding Rules: Small Sewage Discharge To A Surface Water

How to meet the general binding rules if your septic tank or small sewage treatment plant releases (discharges) waste water to surface water.

Applies to England

Contents



Overview

If you’re the operator of a septic tank or small sewage treatment plant, you will not need a permit if you meet all of the general binding rules that apply to you.

The full set of rules are summarised in the publication Small sewage discharges in England: the general binding rules.

This guide explains which of the general binding rules you must meet if you discharge waste water to a surface water, such as a:

The rules to meet depend on whether the discharge is ‘existing’ or ‘new’.

You must also have the other permissions that you need to discharge to the environment legally, including:


Existing discharges: what this means

You have an existing discharge if all of these points apply to you:

If so, check if you can meet the general binding rules for existing discharges. You will not need an environmental permit if you can.


New discharges: what this means

You have a new discharge if you either:

If so, check if you can meet all of the general binding rules for existing discharges, plus the additional rules for new discharges. You will not need an environmental permit if you can.

Rules for existing and new discharges

Rule 2: Only discharge 5 cubic metres or less a day in volume

For sewage from a residential property, use the daily discharge calculator to work out how much you discharge a day.

For commercial properties (such as a hotel, restaurant or office) or holiday accommodation (such as a cottage or chalet), use British Water’s Flows and Loads guidance. You will need to add all sources of flow together.

If you discharge more than 5 cubic metres (5,000 litres) a day to surface water you must connect to the public foul sewer when it’s reasonable to do so. You must apply for a permit if it’s not.


Rule 3: Only discharge domestic sewage

The sewage must be domestic in nature, for example from a toilet, bathroom, shower or kitchen of a house, flat or business (such as a pub, hotel or office).

Find out more about what the definition of domestic sewage includes.


Rule 4: Do not cause pollution of surface water or groundwater

The sewage must not cause pollution – find out how to check for pollution.

Rule 6: Use the correct treatment system

You must use a small sewage treatment plant to treat the sewage if you’re discharging to a watercourse such as a river or stream. A sewage treatment plant, also known as a package treatment plant, treats sewage to a higher standard than a septic tank.

If your septic tank discharges directly to a watercourse, as soon as possible you must either:

You must have plans in place to do this work within a reasonable timescale, typically 12 months.

If you buy or sell a property with a septic tank that discharges directly into a watercourse

You should agree with the buyer or seller who will be responsible for replacing or upgrading the treatment system. You should agree this as a condition of sale.

New sewer: first time sewerage scheme

If more than one property needs to replace or upgrade their sewerage system, your sewerage undertaker may have a legal duty to provide a sewer for you to connect to. This is known as first time sewerage.

Rule 8: Tidal areas: make sure you discharge below the mean low water spring mark

If you’re in an area where the water level changes according to tides, you must make sure the top end of the pipe that releases sewage is below the ‘mean low water spring mark’. This is the average low water mark at the time of spring tides. Check the low water mark where you live.

Rule 9: Make sure your treatment system meets the right British Standard

Your system must meet the relevant British Standard that was in place at the time it was installed.

The current standards for new systems are:

How to check if your treatment system met the British Standard

Your septic tank or treatment plant met the British Standard in place at the time of installation if:

You can also ask the company that installed your equipment to confirm that it met the British Standard in place at the time of installation.

If your treatment system was installed before 1983 you do not need to do anything to meet the British Standard. There was no British Standard in place before then. You must still meet the other general binding rules that apply to you.

Non-British Standard systems

Retrofit systems within an existing septic tank can only be used if they were installed before 2007. If you have a system like this that was installed after that date, or you are planning on installing one of these systems, you must apply for an environmental permit.

You can only use a reedbed or a secondary treatment unit, installed after a septic tank, to discharge to a watercourse if it meets the relevant British Standard. Otherwise you must either:

Rule 10: Make sure your treatment system is installed and operated correctly and has enough capacity

Your treatment system must be large enough to handle the maximum amount of sewage it will need to treat.

If you install a new small sewage treatment plant you must check with the installer that it meets the sizing requirements in British Water’s Flows and Loads guidance.

Your treatment system must be installed and operated in line with the manufacturer’s specification. This is the instruction manual or technical set of requirements that comes with the equipment.

If the amount of sewage the system needs to treat increases

You must make sure the treatment system is still big enough. For example, this could be if you extend your property or connect another property. You must recalculate the maximum daily volume of your discharge.

If you discharge more than 5 cubic metres (5,000 litres) a day to surface water you must connect to the public foul sewer when it’s reasonable to do so. You must apply for a permit if it’s not.

Rule 11: Get your treatment system regularly maintained

You should have your treatment system regularly maintained in line with the manufacturer’s instructions. If these are not available, ask your local maintenance company for advice.

You must have your treatment system repaired or replaced if it is not in good working order. For example, this could be if it has:

Anyone who carries out maintenance on your system must be competent (rule 11). Competent people include those on British Water’s list of accredited service engineers.

If you change your treatment system, check if it’s now classed as a new discharge.

Rule 12: Get your treatment system regularly emptied

You must get the sludge that builds up in your sewage treatment plant removed (desludged) before it exceeds the maximum capacity. As a minimum, you should have your treatment system desludged once a year or in line with the manufacturer’s instructions.

The company you use to dispose of your waste sludge must be a registered waste carrier. You can find this out by either asking the:

Rule 13: You sell your property: tell the new owner about the sewage treatment system

If you sell your property, you must tell the new operator (the owner or person responsible for the sewage treatment plant) in writing that a sewage discharge is in place.

Include:

Rule 14: You stop using your treatment system: make sure it’s decommissioned properly

You must remove anything that could cause pollution (for example, remaining sludge) when you stop using a septic tank or sewage treatment plant.

This does not apply if you only stop using the equipment temporarily, for example if your property is empty.

You can ask a maintenance company for advice on how to decommission your septic tank or treatment plant properly.

New discharges: additional rules

Rule 15: Check if you can connect to a nearby public foul sewer

If you connect to a public foul sewer:

To find out if there is a public sewer near your property, contact your local water company.

For a single domestic property

You cannot meet the general binding rules if there’s a public foul sewer within 30 metres of any boundary of the premises that your system serves.

If you’re building a development of more than one property

Multiply the number of houses by 30 metres.

Example

If there are 3 properties then this will give you a distance of 90 metres (3 × 30 metres).

You cannot meet the general binding rules if any boundary of the premises that your system serves is within that distance of a public foul sewer.

If some or all of your discharge is from non-domestic properties

Divide the maximum volume in cubic metres that you want to discharge from those other premises by 0.75 (1 cubic metre is 1,000 litres). Multiply the result by 30. This will give you a result in metres.

Example

A discharge of 1.2 cubic metres divided by 0.75 gives 1.6, which multiplied by 30 gives a result of 48 metres.

You should cannot meet the general binding rules if any boundary of the premises that your system services is within that distance of a public foul sewer.

If your discharge is in a sewered area

Check what you need to do if your discharge is in a sewered area.

If there is no public foul sewer, check if your sewerage undertaker has a duty to provide first time sewerage.

Rule 17: Make sure the discharge point is not in or near protected sites

You cannot meet the general binding rules if the new discharge will be in or within 500 metres of any:

You also cannot meet the rules if the new discharge will be in or within:

If you have or are planning to start a new discharge to ground in or near a protected site, you must connect to the public foul sewer when it’s reasonable to do so. You must apply for a permit if it’s not.

How to check the locations of protected sites

You can use Magic map to identify the locations of most of these sites.

Magic does not indicate the locations of freshwater pearl mussel populations, chalk rivers or aquatic local wildlife sites.

If you don’t know whether the discharge will be in or near a protected site, or if you cannot use Magic, contact the Environment Agency to request a nature and heritage conservation screening.

Rule 19: Make sure the surface water has flow

You cannot meet the general binding rules if you have a new discharge to:

Rule 20: Make sure any partial drainage field is close enough to the watercourse 

A partial drainage field is a length of perforated pipe that is installed between the sewage treatment plant and the outfall. It is installed instead of a solid pipe. This allows some of the waste water to soak into the ground when the ground is dry and flows in the watercourse are likely to be lower.

If you’re using a partial drainage field for a new discharge, the perforated section of the pipe must not extend more than 10 metres from the edge of the watercourse. You must only use it with a small sewage treatment plant, not a septic tank.

Rule 21: Do not discharge to an enclosed lake or pond

You cannot meet the general binding rules if you have a new discharge to an enclosed lake or pond. This means a lake or pond in which all of the following apply:

You do not need a permit to discharge to an enclosed lake or pond. But you must use appropriate pollution prevention measures to make sure your discharge does not cause pollution.

More information on the rules

You should get advice from a competent service engineer if you need help understanding:

British Water provides a list of accredited service engineers. There may be other competent service engineers.

There’s also guidance on how to meet the general binding rules if your septic tank or small sewage treatment plant discharges to the ground.

If you cannot meet all of the rules that apply to you

You must either:

If you cannot change your system and it’s not reasonable to connect to a public foul sewer, then you must apply for a permit. In your application you must justify why it’s not reasonable to connect to a public foul sewer. The Environment Agency will then assess the risk of using your system at your location.

Enforcement

If your discharge causes pollution you may be committing an offence. The Environment Agency will give you advice to help you fix the problem. If your discharge continues to cause pollution the Environment Agency may take enforcement action against you


General binding rules for small sewage discharges (SSDs) with effect from 2 October 2023

This guidance sets out the statutory general binding rules which will apply to SSDs from 2 October 2023. It includes two additional rules (22 and 23) which you must also meet if your discharge started on or after 2 October 2023. 


The following general binding rules apply to all small sewage discharges