UK Phosphorus Removal in 2026 - AMP8 & Regulations

Phosphorus is one of the central issues for wastewater treatment now and over the next decade. Here, Dan Parry, Head of Sales, Municipal and Industrial UK, outlines the current situation with regard to phosphorus treatment in the UK and the options for addressing this challenge.

At a Glance:

• UK phosphorus discharge limits were tightened under the Environment Act 2021.

• A 50% reduction in phosphorus loadings is required by January 2028 (compared to 2020 levels), progressing toward 80% by 2038.

• Wastewater treatment works contribute an estimated 60–80% of phosphorus entering watercourses.

• AMP8 (2025–2030) significantly increases the scale of investment in phosphorus removal.

• Municipal and industrial operators should assess treatment capability early to ensure compliance and cost-effective delivery.
  
  

What Is Phosphorus and Why Is It a Concern in Watercourses?

Phosphorus is an important mineral; it is crucial for agriculture and essential for human health. However, excess quantities in the natural environment, especially in watercourses, can cause serious damage to aquatic ecosystems. Elevated phosphorus concentrations stimulate excessive plant and algal growth, a process known as eutrophication. This can lead to algal blooms, reduced light penetration and the depletion of dissolved oxygen as organic matter decomposes. Lower oxygen levels can stress or harm fish and invertebrate populations, disrupt ecological balance and impact overall river health. Therefore, phosphorus removal is a critical part of wastewater treatment, with progressively tightening regulatory limits driving improved water quality and supporting long-term biodiversity objectives.

While overuse of fertilisers in farming has traditionally been associated with high levels of phosphorus in rivers, effluent from wastewater treatment facilities accounts for around twice as much (60 to 80%) of the total. Therefore, there is now a particular emphasis on reducing the contribution from this source. Phosphorus was a focus of the most recent Asset Management Period (AMP7), and this focus increases significantly during AMP8 (2025–2030), where tighter phosphorus discharge permits and expanded Water Industry National Environment Programme (WINEP) schemes are driving further upgrades.

UK Phosphorus Regulations and AMP8 Requirements

In England, the tightening of phosphorus levels in treated wastewater discharged into water courses is being driven by the Environment Act 2021 and the supplementary Environmental Targets (Water) (England) Regulations 2023. This legislation sets a legally binding target to achieve a 50% reduction in phosphorus loadings to watercourses by 31st January 2028, compared to the 2020 baseline, on the way to an 80% reduction by 31st December 2038. These targets form a key part of England’s wider river basin management and nutrient reduction strategy.

For operators, this means that investment in more effective treatment and additional treatment steps is required in the coming years. This raising of standards also has an impact on some industrial businesses. For those whose wastewater has high levels of phosphorus, discharge permit conditions issued by water companies will also be tightened to support the overall goal. For both municipal and industrial applications, there are a number of options for wastewater treatment to achieve the required standards.

Phosphorus Removal Technologies for Municipal and Industrial Sites

Chemical

This treatment uses a metal salt, most commonly iron, to precipitate ortho-phosphate. The precipitate forms as a solid and is removed in either a settlement tank or a tertiary solid capture process, such as a disc or sand filter. Our Actiflo clarifier solution utilises microsand to ballast the chemical flocs, significantly increasing the settling velocity of the particles. This delivers very short retention times and a more compact design. In fact, the footprint of an Actiflo system is as much as 40 times smaller than conventional clarifier systems.

Filtration

Filtration technologies – especially disc filters and pile cloth filters, thanks to their compact footprint – can provide an excellent solution for sites looking to improve the effectiveness of their treatment process to meet more stringent standards. They use a fine media mesh or cloth mounted on a number of rotating discs to effectively remove a range of contaminants. In addition, our Hydrotech Disc Filters provide a higher level of filtration for a smaller footprint than many standard drum or disc filters. This is especially true for the Hydrotech Cloth Filter, which uses a pile filter material mounted on the Hydrotech disc filter frame. This unique design allows more suspended solids to be trapped in the pile fibres, achieving a nominal particle removal of 5 microns – enabling a robust phosphorus reduction. These filters also offer a flexible and modular solution with a comparatively low TOTEX – the total expenditure combining CAPEX and OPEX.

Partnering for Effective Phosphorus Compliance

Choosing the right solution based on the exact requirements of the site is essential to ensure an effective and cost-effective approach. As a leading water treatment specialist, our expert team will be able to provide guidance on the most appropriate technologies for each site based on decades of knowledge and experience at sites in every area of the world. We also have a wide range of solutions, meaning, unlike some, we can truly offer the right technology for every application.

 Speak to one of our experts about how we can assist you with your site's phosphorus removal, HERE.