Proseptic always aims to demystify regulations around sewage and discharges, e.g. updates on the General Binding Rules. And several of the questions we’ve been asked recently relate to Groundwater Source Protection Zones, or SPZs. This helpful guide should clear up some of the more important points around SPZs and how they affect those properties situated within them.
What is an SPZ?
An SPZ is a designated area created to protect the surrounding environment groundwater sources such as wells, springs and boreholes.
These supply around 30 percent of UK drinking water, so protecting them from contamination is understandably important.
The Environment Agency has established these zones to highlight areas where the risk is highest and prevent pollution of these vital resources.
As such, there are significant implications for any property owner or occupants considering their effluent discharge options.
SPZs in the UK are classified in three main ways (plus a rarer fourth category):
- Inner protection zone
This is defined as any area in which groundwater takes 50 days or fewer to travel to the source, within a minimum 50 metre radius.
Understandably, these SPZ1s are subject to the highest levels of protection.
- Outer protection zone
Representing a medium risk area, these zones are defined as anywhere with a 400 day travel time from a point below the water table.
- Total catchment
SPZ3s cover the total catchment area of any groundwater source, regardless of travel time – still protected but classed as a lower risk.
- Special interest
This less common designation refers to specific cases that may be particularly sensitive due to local conditions.
What do I need to do if my property is in a SPZ?
You can find out if you’re affected by SPZ restrictions by heading to DEFRA’s interactive map tool via magic.defra.gov.uk.
Enter your postcode in the top level search box and follow these steps:
- Click the ‘Map layers’ icon (top of the list in the left hand sidebar)
- Expand the ‘Designations’ dropdown menu
- Expand the ‘Land-based designations’ dropdown menu
- Expand the ‘Non-statutory’ dropdown menu
- Tick the box marked ‘Source protections zones merged’ to apply the layer
If your property is located within a relevant SPZ, there are a number of viable solutions that can be applied, depending on your circumstances.
These could include:
- Installation of a superior sewage treatment plant that satisfies the higher standards required by the Environment Agency
- A sealed cesspool that will require regular emptying
- Connection to the mains sewerage network where feasible
- Other alternative discharge routes
Need more support or info on SPZs?
The best way to ensure what your property needs to remain compliant with effluent discharge solutions is through professional consultation. A drainage survey or inspection – particularly prior to purchasing a property – is advisable.
To arrange a survey, or discuss any requirements with a professional expert, please get in touch.