STS

STS, a nutrient neutrality platform in the UK

STS presents itself as a leading provider of nutrient neutrality in the UK. Its activity combines the replacement of outdated septic tanks with modern, regulation-compliant wastewater treatment plants, known as Package Treatment Plants (PTP), with its own digital platform that automates the entire nutrient mitigation process, from site identification to credit generation.

The company states that its proprietary platform covers land identification through AI mapping, data capture in on-site surveys, automated workflows for individual homeowners, and the preparation of Technical Mitigation Reports. It also automatically generates S106 Unilateral Undertakings linked to the Land Registry and offers tank monitoring with immutable 90-year audit trails.

Context: the water quality crisis and nutrient neutrality

According to the company's material, the UK faces a growing water quality crisis. Pollution from outdated septic systems and wastewater discharges is placing increasing pressure on rivers and on the planning system. In this context, local authorities are forced to restrict new developments to protect fragile catchments.

STS claims to address the problem from two fronts: upgrading existing systems and unlocking sustainable growth through nutrient mitigation. The site cites three figures: 61% of UK rivers are classified as polluted, 55% of river pollution is linked to wastewater, and 86% of UK rivers fail ecological standards.

Solutions for individual homeowners

For homeowners, STS offers a service at no cost to the user, with end-to-end regulatory compliance and a fully monitored system with a 90-year audit trail. The proposal includes replacing old septic tanks with modern, compliant treatment plants, with the stated aim of protecting both the homeowner's installation and the environment.

Solutions for developers and nutrient credits

For developers, the company offers nutrient credits that unlock planning approval in protected catchments. The described flow allows uploading a budget, obtaining mitigation options instantly, paying, and quickly receiving all required documentation.

The proprietary nutrient credit database matches available credits from PTP installations with new developments that need nutrient offset. Developers do not access the database directly: it is the STS team that verifies availability and suitability. Each credit is linked to a defined location within the same catchment as the development, ensuring the geographical relevance of the mitigation. Credits are only released once the mitigation is in place and verified through testing, and the company maintains strict delivery timelines so that nutrient reductions are active before the new development begins to impact the environment.

Monitoring and technical support

STS combines on-the-ground expertise with its own digital monitoring tools. Its in-house platform provides real-time insights into system performance, in order to maintain compliance, avoid issues, and reduce environmental risk. The company describes its approach as practical, low-impact, and built to last.

Validation by Natural England

STS has been through Natural England's Discretionary Advice Service (DAS), a formal, chargeable process that provides detailed environmental advice on nutrient neutrality mitigation schemes. According to the company, as part of that process Natural England confirmed that local planning authorities can rely on the STS scheme when undertaking appropriate assessments, giving certainty to developers, planners, and homeowners.

Presence and contact

The company operates from Seymour House, in Loddon (Norwich, Norfolk), and also has an office in Kent. It serves individual homeowners and developers, and offers a free, no-obligation survey for those who wish to upgrade their septic system.

Locations and offices

HQ: Seymour House, Loddon, Norwich, Norfolk NR14 6JD · Phone: 01502 802007

Kent Office: Phone: 01233 516248