Certifications in the agri-food sector initially concentrated on organic and conventional farming systems, as well as food processing standards. More recently, water stewardship certifications have emerged as voluntary mechanisms to structure and improve water management across agricultural and manufacturing operations. In essence, they set standards and audits that reward those who measure, reduce, and manage their water-related impacts at site and catchment scale. Their appeal is twofold: they facilitate dialogue with communities and authorities, and they generate market signals — reputational and, at times, monetary — for producers and brands.
The available evidence suggests environmental benefits when audited practices translate into concrete measures: controlling run-off, reducing erosion and nutrient losses, and measurable improvements in water quality and quantitative status of water bodies in projects with post-implementation monitoring. These results are most apparent when a catchment approach is adopted, performance is monitored, and interventions are tailored to local conditions. Nevertheless, the literature itself highlights methodological uncertainties (modelling, scales of analysis) and verification gaps that can dilute aggregate effects and open space for opportunistic behaviour. In governance terms, a recurring recommendation is to reinforce transparency and traceability of impacts if the goal is to move from “good practice” to verifiable environmental outcomes.
Beyond biophysical performance, the most intense debate concerns equity. Critical analyses note that many standards are defined and monitored by private actors with significant influence over global markets, which can reinforce power asymmetries along the chain. For smallholders, the fixed costs of certification, auditing, and technological adoption are barriers to entry. Added to this is a technocratic bias towards “efficiency” (for example, promoting drip irrigation) that does not always reduce consumption at catchment scale and can provoke undesirable distributional effects: concentration of water and land rights, or the unravelling of local allocation arrangements in traditional irrigation systems. These dynamics challenge the notion that certification, in and of itself, guarantees a fairer allocation of responsibilities along the chain.
The problem is not only distributive, but also analytical. In complex aquifers it is difficult to attribute impacts to individual users and, therefore, to verify robustly criteria that require “no negative impact” on the aquifer. When audits are sporadic or fail to capture operational variability, the system’s credibility suffers. The consequence is familiar: certifications tend to accredit individual actors without addressing systemic determinants — consumption patterns, inadequate regulatory frameworks — and thus treat symptoms rather than causes.
What, then, motivates producers to seek certification? Empirical evidence points to a combination of market incentives (access and differentiation), reduced regulatory risk, and the search for technical support. In a choice experiment with 116 farmers in Italy, Croatia, and Greece, participants displayed a higher willingness to pay for a scheme that guaranteed efficient water use, with a preference for a public certifying body and for receiving technical assistance during adoption. In other words, demand for certification increases when the design incorporates complementary goods (training, accompaniment) and when scheme governance is perceived as more credible.
The literature on stewardship behaviours adds useful nuance: “know-how” to implement practices, risk perception, and the search for peace of mind are important triggers of action, whereas complacency, inconvenience, and costs hinder sustained adoption. Translated into certification design, this suggests that schemes which simplify compliance, reduce transactional burdens, and provide practical information are more likely to change behaviours durably.
Three lessons emerge for a fairer and more effective use of water stewardship certifications:
- From site to catchment. Standards must clearly link on-farm actions to measurable catchment-level outcomes, supported by baselines, indicators, and post-intervention monitoring, with audit requirements calibrated to contextual risk. Without such traceability, certifications ultimately recognize effort rather than verified results. At the same time, when farmers implement best available practices and comply with authorized water abstraction limits, certification schemes should not hold them accountable for failures that stem from shortcomings in public water governance.
- Equity and costs. Integrating support mechanisms for smallholders (technical assistance, progressive scaling of requirements, reduced fees, group certification) is necessary to avoid widening gaps. In addition, avoiding one-size-fits-all technological prescriptions (e.g., drip irrigation as a universal “best practice”) and prioritising verifiable water outcomes helps to mitigate undesirable distributional effects.
- Distribution of responsibilities. Water management along the chain requires shared, contractual obligations: buyers and brands should co-finance improvements at source and assume science-based water targets, and audits should examine both producers’ practices and buyers’ sourcing policies. Independent oversight and public reporting of impact metrics strengthen accountability.
Water stewardship certifications are valuable instruments for aligning private incentives with public objectives for water sustainability. Their benefits are tangible when combined with outcome metrics and a context-sensitive design. But they can also reproduce inequalities if they turn “efficiency” into dogma, shift costs onto those with least capacity, and fail to distribute responsibilities across the chain. The challenge is not to discard them, but to reform them so that they meet their promise: to contribute, with evidence in hand, to healthier catchments and socially just water transitions.
Esther Díaz-Cano
Research Fellow and Temporary Lecturer
WEARE Research Group
Universidad de Córdoba
Spain
Julio Berbel
Full Professor of Agricultural Economics
WEARE Research Group
Universidad de Córdoba
Spain
