White Rivers, Red Ledgers: The ESG Crisis of UK Dairy’s Milk Dumping
Janet Ng, U.K. ESG Advocate
In early 2026, Freshways, a major UK dairy processor, reported it was forced to dump surplus milk during the Christmas period (Figure 1) due to a severe supply-demand disconnect and processing capacities being overwhelmed (The DairyNews, 2026). While industry logic often cites “softening wholesale prices” and "diminishing returns" as the catalyst for such waste, let’s view this through an ESG critical lens.
Environmental Dimension: Milk as an Ecological Pollutant
To the casual observer, pouring milk into water might seem harmless. However, untreated milk entering a riverine system is ecologically devastating. Milk is an organic substance with an incredibly high Biological Oxygen Demand (BOD) (Goddard, 2022). When raw milk enters a river, it triggers eutrophication — a process where excess nutrients lead to oxygen depletion, effectively suffocating aquatic life. Academic research has shown that even treated dairy wastewater contains elevated levels of potassium, sodium, and chloride, which can significantly reduce the counts of sensitive invertebrates like Gammarus (Goddard, 2022). Raw, untreated milk is many magnitudes more concentrated and lethal to headwater catchments.
Furthermore, the UK dairy industry is a leading cause of agricultural pollution, accounting for over 75% of all serious agricultural pollution incidents recorded in 2022 (River Action, 2024). This pollution is primarily driven by the mishandling of dairy slurry and silage. Regional regulatory inspections, such as a 2022 report in North Devon, have found that up to two-thirds of inspected dairy farms were actively polluting watercourses at the time of the visit (River Action, 2024).
Social Dimension: Food Security and Farmer Welfare
The UK is the eleventh largest milk producer in the world, with the industry worth approximately £4.5 billion (Goddard, 2022). Yet, despite its economic scale, the social fabric of the industry is fraying. Dairy farmers have endured decades of severe financial instability. Between 1988 and 2009, farmgate prices experienced heavy volatility, swinging between 14.6 and 23.8 pence per litre (ppl) (Figure 2). This instability has frequently pushed producers into the red; in 2002/03, for example, 60% of dairy farms failed to cover their production costs. This trend of chronic unprofitability persisted into the following decade, with market prices falling short of production costs by an average of 3.16 ppl between April 2010 and March 2011 (Boulton, et al., 2015). For many small-scale producers, the “economies of scale” required to survive are simply unreachable, leading to a mass exit from the industry (Rose & Paparas, 2023). In 2019 alone, there was a 7.3% annual reduction in producer numbers (Rose & Paparas, 2023).
This creates a perverse social reality: processors are forced to dump excess milk while the public faces fluctuating retail prices (DairyNews.today, 2026; Rose & Paparas, 2023). The push for “sustainable intensification” in agriculture often creates immense pressure on the herdsman and the welfare of the cow (Boulton, et al., 2015). This stress is likely compounded when processors are forced to physically waste the fruits of the farmers’ labour due to oversupply (DairyNews.today, 2026). The ongoing disposal of usable milk by processors highlights a critical inefficiency in the supply chain. Future ESG frameworks should consider quantifying the social cost of destroying food in an era where food insecurity persists.
Governance Dimension: A Failure of Regulation and Market Power
The root of the milk-dumping crisis lies in governance. The UK milk market is highly oligopolistic. The four biggest retailers — Tesco, Sainsbury's, Asda, and Morrisons — hold significant bargaining power over producers (Rose and Paparas, 2023). This allows retailers to dictate prices, often using liquid milk as a “loss leader” to gain customers, which magnifies price fluctuations for the producers while keeping retail prices relatively stable (Rose and Paparas, 2023).
Furthermore, the transition from the EU's Common Agricultural Policy (CAP) to the UK's Environmental Land Management Scheme (ELMS) has left many farmers in a state of financial uncertainty (River Action, 2024; Rose & Paparas, 2023). Governance is also failing in the realm of certification. Reports suggest that "Red Tractor" assured farms — the primary environmental standard for UK dairy — are actually responsible for the majority of severe agricultural pollution incidents, proving that current assurance schemes are not an indicator of good environmental performance (River Action, 2024).
A Path Toward Sustainability
To prevent “white rivers” from becoming a seasonal norm, structural reforms supported by academic research and environmental advocacy need to be implemented:
Circular Economy Integration: Rather than viewing excess milk or slurry as waste, the government could subsidize technological solutions to re-process dairy by-products into organic, transportable fertilizers (River Action, 2024). This reduces reliance on imported synthetic fertilizers and prevents nutrient run-off.
Pricing Incentives for Environmental Performance: Dairy processors could follow the lead of cooperatives like Arla Foods, which has introduced a Sustainability Incentive Model (River Action, 2024). This model rewards farmers with higher prices for meeting verifiable environmental targets, providing the financial stability needed to invest in better waste infrastructure.
Robust Regulatory Enforcement: The Environment Agency could move away from “advisory” warnings and start fully enforcing the Farming Rules for Water. Legal deterrents are necessary to ensure that market failures do not result in environmental catastrophes (River Action, 2024).
Transparent Price Transmission: Policymakers could curb the dominance of the supermarket oligopoly to ensure fair pricing and efficient information flow through the value chain (Rose and Paparas, 2023).
Reflection
Is the retail price of milk truly reflective of its environmental and social cost of production?
Market design has prioritised price competitiveness over long term resilience. When the market oversupplies, current governance structures deem it more cost-effective to dispose of the product — absorbing the associated environmental externalities — than to financially support the producer. However, a sustainable dairy industry requires a framework where the ecological health of the catchment, animal welfare, and farmer livelihoods are not subordinated to the profit margins of a consolidated retail sector.
The degradation of UK waterways serves as a critical risk indicator. It is time the industry addresses these market failures before the ecosystems meant to sustain agricultural production are irreparably compromised.
References:
Boulton, A., Rushton, J., Wathes, C. & Wathes, D., 2015. Past trends and future challenges for a sustainable UK dairy industry. [Online] Available at: https://www.researchgate.net/profile/Alana-Boulton/publication/286113914_Past_trends_and_future_challenges_for_a_sustainable_UK_dairy_industry/links/566fc15308aec0bb67bf8271/Past-trends-and-future-challenges-for-a-sustainable-UK-dairy-industry.pdf [Accessed 2 April 2026].
DairyNews.today, 2026. UK Dairy Oversupply Leads to Increased Milk Disposal by Freshways [Online] Available at: https://dairynews.today/global/news/uk-dairy-oversupply-leads-to-increased-milk-disposal-by-freshways.html [Accessed 30 March 2026].
Goddard, R., 2022. An investigation of the impacts of a dairy industry waste on river water quality and the appropriateness of current monitoring approaches and regulation. [Online] Available at: http://dx.doi.org/10.24382/1253 [Accessed 31 March 2026].
Morris, J., 2026. Clean-up after 1,750 gallons of milk enter stream. [Online] Available at: https://www.bbc.com/news/articles/c3930rxyd71o [Accessed 30 March 2026].
River Action, 2024. The Dairy Industry and River Pollution. [Online] Available at: https://riveractionuk.com/wp-content/uploads/2025/03/River-Action-Dairy-Report-2024.pdf [Accessed 31 March 2026].
Rose, R. & Paparas, D., 2023. Price Transmission: The Case of the UK Dairy Market. [Online] Available at: https://www.mdpi.com/2813-2432/2/1/4 [Accessed 31 March 2026].
(Date: 27th April, 2026)
