SOFIIN, the Soil First Initiative

Cleaner rivers start in the soil.

A nationwide effort to bring Britain’s farmland soils back to life, so the land holds the rain, the nutrients and the soil itself, instead of losing them to our rivers. Healthier ground, cleaner water, and a countryside that keeps working.

See how it works The benefits
A river winding through green farmland
Backed by a UK Research and Innovation project
30+ years of field validation in Europe
Validated with 8+ research institutions
UK field trial sampled with Natural England and a Wildlife Trust
The problem

Our rivers are carrying too much off the land.

When soil is tired and bare, rain runs straight off it, carrying nutrients and sediment into the nearest watercourse. Over time that is one of the biggest pressures on the health of England’s rivers.

14%
of England’s rivers are in good ecological health
60%
of the nitrogen reaching England’s rivers comes off farmland
55%
of England is a designated Nitrate Vulnerable Zone
6,527
recorded agricultural reasons for water bodies failing to reach good condition

Sources: Environment Agency, Defra and The Rivers Trust. A treatment works can only clean what reaches the pipe. The run-off from the land is the pressure it cannot solve.

The waterways

What it does once it reaches the river.

In August 2026 the Environment Agency published its first full assessment of England’s waters in six years. It named phosphate, which comes from sewage and from farm run-off, as the single biggest problem of all. Nutrients washed off farmland do not simply pass through: they change the water, and everything living in it, all the way down to the sea.

1 in 7
of England’s rivers, lakes and coastal waters is in good ecological condition
Not one
waterway in England passed the separate test for chemical pollution
Half
of river water bodies still fail the phosphorus standard for good status, the single biggest problem of all

Nutrients feed algae

Nitrate and phosphate arriving in slow, warm water feed algal blooms. The bloom spreads across the surface, and as it dies and decomposes it strips the oxygen out of the water beneath.

The oxygen goes, the life follows

Fish, invertebrates and the insects they depend on cannot live in deoxygenated water. A river can look full and still be close to empty.

Sediment smothers the gravels

Soil washed off a bare field settles on the riverbed and clogs the clean gravel that trout and salmon spawn in, and that river insects live among.

Then somebody has to drink it

Water abstracted downstream must be treated before it reaches a tap. Removing nitrate is expensive, it has to be built, and it has to be paid for again every year the load keeps arriving.

Source: Environment Agency assessment of England’s rivers, lakes and coastal waters, published August 2026, the first comprehensive assessment in six years, together with recorded reasons for not achieving good status across all 94 English management catchments. Agriculture accounts for around 60 per cent of the nitrogen and 28 per cent of the phosphorus reaching England’s water bodies.

A river winding between grazed fields, seen from the air
What the land sheds, the river keeps
A tree lined river bend seen from the air
A river is the record of the land it runs through
A slow lowland stream with cow parsley on the bank
Cleaner rivers start in the soil, not at the pipe
The mechanism

Where the nitrogen and phosphate actually go.

Two fields side by side, the same rain on both, one river along the foot. Follow it down the page, one stage at a time.

  1. Stage 1 of 8PNPNPNPPNPNPNPLEFT ALONETHE RIGHT FIELDTHE RIVERTHE RIVER
    Stage one of eight

    Two fields, and the same rain.

    Both fields grow the same crop and get the same weather. We are going to change only one of them, so you can see what the change does.

  2. Stage 2 of 8PNPNPNPPNPNPNPLEFT ALONETHE RIGHT FIELDNUTRIENTS REACH THE RIVERNUTRIENTS REACH THE RIVER
    Stage two of eight

    Right now, the nutrients wash away.

    Plants take their nutrients out of the soil. When it rains on tired ground, those nutrients are carried straight down and out into the river.

  3. Stage 3 of 8one pass, once a yearPNPNPNPPNPNPNPLEFT ALONEGIVEN THE BIOLOGYNUTRIENTS REACH THE RIVERTHE RIVER
    Stage three of eight

    On the field on the right, we add micro-organisms.

    Tiny living things, far too small to see. One handful holds 28,000 different kinds, and once they are in the ground they stay there and multiply.

  4. Stage 4 of 8CNCNCNcaught straight out of the airPNPNPNPPNPNPNPLEFT ALONEGIVEN THE BIOLOGYNUTRIENTS REACH THE RIVERTHE RIVER
    Stage four of eight

    Some of them take nitrogen straight from the air.

    The air above us is mostly nitrogen, and plants need nitrogen to grow. These ones take it straight out of the air and put it into the soil, for nothing.

  5. Stage 5 of 8PNPNPNPPPnutrients that were locked, now unlockedLEFT ALONEGIVEN THE BIOLOGYNUTRIENTS REACH THE RIVERTHE RIVER
    Stage five of eight

    Some work with the roots.

    They live on the roots and trade with the plant. In return they unlock nutrients that were already in the soil, but locked up where roots could not reach them.

  6. Stage 6 of 8PNPNPNPhumus and clay, bound into crumbsLEFT ALONEGIVEN THE BIOLOGYNUTRIENTS REACH THE RIVERTHE RIVER
    Stage six of eight

    And some bind it into crumbs.

    They turn old leaves and roots into humus, which is dark and sticky. The humus binds on to the clay in the soil, and together they build crumbs. Soil scientists call it the clay humus complex.

  7. Stage 7 of 8a sponge for the raina cupboard for the nutrientsa spring to keep it openPNPNPNPPNPNPNPLEFT ALONEGIVEN THE BIOLOGYNUTRIENTS REACH THE RIVERLESS REACHING THE RIVER
    Stage seven of eight

    The crumbs hold on to everything.

    A crumb soaks up rain like a sponge, holds the nutrients like a cupboard, and keeps the soil springy so roots and air can get down.

  8. Stage 8 of 8PNPNPNPPNPNPNPLEFT ALONEGIVEN THE BIOLOGYNUTRIENTS REACH THE RIVERNUTRIENTS HELD IN THE FIELD
    Stage eight of eight

    Same rain. Very different river.

    The field on the left is still losing its nutrients to the water. The living one is keeping them. That is what we do, field by field.

What we do

We build the soil back to life.

Using natural soil biology, the initiative helps farmland grow deeper roots and richer structure. Living soil behaves like a sponge: it soaks rainfall in and holds nutrients where the crop can use them, rather than letting them wash away.

It is done field by field and catchment by catchment, with a purpose-built water model that finds the ground most at risk and measures the change year on year. The land stays in full production the whole time, and the approach scales to the whole country.

A heavy clay soil A light soil 0306090120Depth below surface, cm 35 cmControl95 cmAfter 3 years 35 cmControl120 cmAfter 3 years Rooting 35 → 95 cm +60 cm, about 6,000 m³/ha more soil reached Rooting 35 → 120 cm +85 cm, about 8,500 m³/ha more soil reached Rooted, living soil Compacted Ultra-compact, no roots Waterlogged, anoxic
Seen in the ground. After three years of treatment, roots reach from 35 cm down to over a metre, and the compacted, waterlogged layer is gone, on two very different soils.
How it works

Four things happen underground.

Living biology

Natural biology wakes the soil up, building humus and a living underground community.

Deeper roots

Better structure lets roots drive down further, opening the ground and reaching more of the soil.

Holds the rain

Living soil soaks up rainfall and holds it, instead of shedding it off the surface.

Keeps it on the land

Nutrients and soil stay in the field where they belong, so far less reaches the river.

A patchwork of hedged green fields seen from the air
Hedged fields, the English lowlands
Rolling fields with hedgerows in blossom
Rolling fields and hedgerows in flower
Sheep grazing a dry summer meadow
Sheep on a Malmesbury meadow, Wiltshire
The benefits

Good for the whole community, and the countryside.

Healthier soil is not just a farming story. What happens in the ground reaches everyone downstream.

Cleaner rivers

Less run-off means clearer, healthier rivers and streams for wildlife, anglers and everyone who lives alongside them.

Safer drinking water

Keeping nutrients and sediment out of the water at source protects the rivers and groundwater our drinking water is drawn from.

Less flooding

Soil that holds the rain slows the flow off the land, easing the flash flooding that hits homes and roads downstream.

Thriving wildlife

Living soil brings earthworms, insects and the birds and mammals that feed on them back to the land, a real gain for nature.

Productive farms and food

The land keeps growing food. Farmers get healthier, more resilient soil and rely less on bought-in inputs.

Carbon and climate

Building soil stores carbon in the ground and makes farmland more resilient to drought and heavy rain.

On the ground

Real fields, real work.

Work already under way on British farmland: the treatment going on across the fields, and the life returning to the soil beneath the sward.

Fungal threads and worm casts in living soil
Living soil beneath the sward
A thick, healthy sward
The growth living soil carries
Farmers looking into a soil pit on treated ground
The evidence, dug up in the field
Backing and validation

Thirty years of field validation, now measured in Britain.

This is not a new idea being tried out on British farmland. It is an established approach with three decades of independent field validation in Europe, and the first UK evidence now recorded in the ground.

UKRI
National research backing

Our work is backed by an accepted UK Research and Innovation project. UKRI is the UK’s national funding body for research and innovation.

320,000+
Hectares, validated at scale

More than thirty years of field validation across over 320,000 hectares of European farmland.

8+
Research institutions

Field validation with more than eight recognised research institutions in France, Germany and Spain, on a wide range of soils.

2025
UK evidence

A UK field trial, with drain water sampled by Natural England’s Catchment Sensitive Farming and a county Wildlife Trust.

The proof

It has been measured in the ground.

In a UK field trial sampled with Natural England and a Wildlife Trust, the treated fields showed drain water with little to no evidence of nutrient pollution, far more life in the soil, and organic matter above the national benchmark.

near zero
nitrate and phosphate measured in the field drains, classed as little to no evidence of pollution
up to 3x
more earthworms per soil pit than the untreated ground next door
above par
soil organic matter, ahead of the national benchmark for healthy soil

Source: a UK field trial, 2024 to 2025, with drain water sampled by Catchment Sensitive Farming and a county Wildlife Trust, and paired treated and untreated soil pits. The full trial record is available on request.

Who we are

A mission to clean water at the field.

SOFIIN, the Soil First Initiative, is a community interest company: a nationwide effort to restore Britain’s farmland soils, working alongside farmers, communities, the water sector and national agencies. Its assets are locked to that purpose by law. The aim is simple: healthier soil, cleaner rivers, and a countryside that thrives.

Our promise

Keep farmland in full production. Prove every result on the ground. And measure the difference where it matters, in the soil and in the water.

Get in touch

Work with us.

Whether you farm, manage land, protect water or simply care about your local river, we would like to hear from you.

EnquiriesUse the form, and we will come back to you.

PartnersA business or funder with a stake in a catchment? Become a partner.

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