Sustainability reporting is no longer just an act of goodwill or an attempt to boost your reputation. It’s evolved into a legal, data-driven discipline backed by audits, assurance, and financial-grade scrutiny. The EU’s Corporate Sustainability Reporting Directive (CSRD) is at the center of this shift.
More than 42,500 EU companies, along with thousands of global firms operating in the region, must comply with the CSRD, which requires the publication of audited, standardized ESG data. It’s one of the most significant transformations in corporate accountability to date.
Key to complying with the CSRD, especially for sustainability leaders, is understanding the five core environmental CSRD reporting standards, which encompass climate change, pollution, water, biodiversity, and resource use.
What is the Corporate Sustainability Reporting Directive (CSRD)?
The CSRD is the EU’s framework for corporate sustainability disclosures, replacing and expanding on the former Non-Financial Reporting Directive (NFRD). In force since January 2023, it brings environmental, social, and governance reporting into the same arena as financial reporting, with mandatory assurance and far higher expectations for accuracy.
Under this framework, organizations report on their environmental and social impact, how they govern those issues, and how operational systems, including energy management systems, are managed across their sites. All of it is subject to independent assurance, which raises the bar on accuracy and traceability.
CSRD applies to large and listed companies within the EU, as well as non-EU firms with a meaningful commercial footprint in the region. For international firms, a single EU entity can be enough to trigger reporting at the group level.
CSRD Reporting Requirements: Timelines
Reporting obligations are being phased in over several years. The first wave of companies, those already subject to the NFRD, began collecting data under the CSRD rules for the 2024 financial year, with their first reports due in 2025.
The second wave, covering other large EU companies that meet at least two of the following criteria:
- Having more than 250 employees
- A net turnover of €40 million
- Total assets of €20 million
will report a year later, based on 2025 data, with publication in 2026.
Listed SMEs, small and non-complex credit institutions, and captive insurers will follow in 2027. Meanwhile, non-EU parent companies with substantial EU operations (generating more than €150 million in annual EU turnover and having at least one large or listed EU subsidiary or branch) will be subject to the directive from 2028.
How CSRD Reporting Requirements Are Organized
CSRD itself is the overarching law. The detailed reporting requirements are defined through the European Sustainability Reporting Standards (ESRS), a structured set of guidelines developed by the European Financial Reporting Advisory Group (EFRAG). These standards provide the specific metrics, definitions, and disclosure boundaries companies must follow.
Each ESRS sets out both what data companies must disclose and how they should present it, ensuring comparability and consistency across sectors, including complex operational areas like laboratory management.
The ESRS framework is organized into four groups:
- Cross-cutting standards: Apply to all ESG topics and define general principles (ESRS 1) and disclosure expectations (ESRS 2).
- Environmental standards (E): Cover areas like climate, pollution, and water.
- Social standards (S): Address workforce, value chains, and community impact.
- Governance standards (G): Focus on business conduct and ethics.
5 CSRD Reporting Requirements You Need to Know
The environmental dimension of CSRD (the E in ESG) is among the most data-intensive. It demands precise, verifiable metrics across five domains. Here’s a breakdown of what each entails:
ESRS E1 – Climate Change
Under ESRS E1, companies must report their greenhouse gas emissions across three defined scopes:
- Scope 1: Direct emissions from owned or controlled sources, like on-site fuel combustion or company vehicles.
- Scope 2: Indirect emissions from purchased energy, such as electricity, heating, or cooling, used by the organization.
- Scope 3: All other indirect emissions in the value chain, including those from suppliers, product use, transportation, waste, and employee commuting.
But emissions data is only the start. ESRS E1 demands a clear connection between climate ambitions and action. Companies must disclose their energy consumption, mitigation strategies, and adaptation plans, along with governance structures that support climate resilience. Disclosures should include transition planning, risk and opportunity analysis, and alignment with global frameworks such as the Paris Agreement.
ESRS E2 – Pollution
This standard ties environmental compliance closely to risk and liability management. Organizations must publish policies, targets, and performance data showing how they minimise harmful discharges and manage waste.
And it’s not just about air emissions. It covers pollutants released into the air, water, and soil, including hazardous substances, as well as noise and light pollution. Companies must disclose both the preventive measures in place and the quantitative results achieved.
In practice, E2 expects organizations to understand every point where pollution can occur, from effluent systems and chemical handling to storage and disposal. Companies must continuously track these risks and report the measures they’ve put in place to prevent incidents. And when something does go wrong, E2 demands clarity on structured root cause analysis, remediation steps, and resources allocated to avoid any recurrence.
ESRS E3 – Water and Marine Resources
Water is now one of the most scrutinized areas under the CSRD. ESRS E3 treats water scarcity, quality, and leakage as direct operational and financial risks, requiring companies to report verifiable data on how water is used and impacted across their operations.
The standard requires companies to disclose:
- Site-level data on water intake, consumption, reuse, and discharge, broken down by source and destination.
- Policies and approaches for water efficiency, wastewater management, and conservation.
- Targets for reducing withdrawals or improving reuse rates.
- Financial implications of water-related risks, dependencies, or incidents.
To meet ESRS E3’s assurance requirements, real-time visibility is critical. Platforms like WINT Water Intelligence offer AI-driven flow analysis to automatically detect leaks and stop them at the source.
Beyond leak detection, WINT also continuously monitors water usage across all buildings, ranging from multi-site residential properties to commercial buildings and critical infrastructure. Its autonomous edge devices record water usage in real-time, even during network or power failures, so every litre is accounted for with timestamped precision.
By capturing accurate usage and incident data automatically, systems like WINT turn day-to-day operations into compliance-ready reporting, integrating with existing platforms and delivering the granular metrics required to meet ESRS E3.
ESRS E4 – Biodiversity and Ecosystems
Under ESRS E4, companies must demonstrate how their operations impact the natural ecosystem and biodiversity surrounding them. They must identify how their activities impact climate and biodiversity loss, and disclose the steps taken to mitigate or reduce that impact, including:
- Identifying and disclosing impacts – explain how their operations, products, or supply chains affect ecosystems, species, and natural habitats.
- Reporting management actions – describe the concrete steps taken to avoid or reduce damage, such as protecting sensitive sites, restoring degraded areas, limiting land conversion, or managing resource extraction more responsibly.
- Set and track measurable targets – outline biodiversity goals (for example, “no net loss” or “net positive impact”) and show progress against them.
- Integrate biodiversity into governance – show that site planning, procurement, and project approvals consider ecological impact, not just financial return.
- Assess dependencies and financial risks – explain how ecosystem decline could affect their operations, assets, or long-term value.
ESRS E5 – Resource Use and Circular Economy
ESRS E5 on how companies utilize materials, manage waste, and integrate circularity into their operations.
Under this standard, companies need to review their entire resource lifecycle, from the sourcing of raw materials to the disposal of products when they are no longer useful. They must disclose their dependency on critical or finite materials and explain how they’re redesigning products or supply chains to reduce waste, reuse components, and keep materials in circulation for as long as possible.
Importantly, ESRS E5 connects the dots between resource efficiency and business resilience. Rising material costs, supply chain volatility, and landfill restrictions all carry bottom-line implications. Companies that demonstrate strong circular practices will be perceived as more future-ready.
Breaking Down the Water-Specific CSRD Requirements
ESRS E3 divides its disclosures into five areas that collectively show how an organization governs, manages, measures, and monetizes its water impact. The structure is linear, from policy to financial effect:
E3-1: Policies
This section requires companies to outline the policies that shape the conservation, discharge, and protection of water. Regulators expect clear lines of accountability, alignment with local regulations, and the translation of corporate commitments into operational practice across different sites.
E3-2: Actions and Resources
This section covers the initiatives and investments aimed at managing water sustainably. Examples include installing high-efficiency fixtures, implementing leak detection equipment, or deploying water reuse technologies. Disclosures must clearly demonstrate how organizations allocate resources and how actions mitigate risk.
E3-3: Targets
Here, companies establish quantitative objectives, such as reducing water withdrawals by a specified percentage or increasing reuse rates across their facilities. Targets should be time-bound, measurable, and tied to performance indicators that external third parties can verify and validate.
E3-4: Metrics and Performance
The core of ESRS E3, this step requires companies to provide site-specific figures on intake, consumption, discharge, and reuse, along with the methodologies used to gather the data. Because these disclosures are subject to audit, audit trails and data lineage have become essential to meeting the standard. In practice, that often means classifying and structuring previously unstructured operational data so it can be trusted for ESG reporting and assurance.
E3-5: Financial Effects
Finally, companies must connect water to financial materiality. They need to describe how water risks, dependencies, or incidents influence operating costs, business continuity, asset value, or insurance exposure. Water intelligence platforms are crucial here, as they enable businesses to automatically quantify water savings and translate that into monetary value.
Leading with Data Confidence
Sustainability performance is now a matter of corporate governance. The organizations that move fastest to standardize their data, automate their monitoring, and verify their metrics will find compliance an enabler of strategic value.
Water is a case in point. Once treated as a mere utility, it’s now a regulated resource that affects risk profiles, operational continuity, and brand trust. Companies that can quantify and verify their water impact at the site level will not only meet the ESRS E3 standard but also strengthen investor confidence and operational resilience.
WINT provides the advanced technology needed for this new era of disclosure. Its AI-powered, in-line water management system delivers real-time, verifiable, and audit-ready usage data across all building systems, including primary feeds, domestic hot and cold water, irrigation, cooling towers, and HVAC. Unlike sensor-based alternatives, this platform stops leaks at the source and supports compliance through continuous monitoring, signal processing, and automated shutoff.
Connect with our team to see how WINT can help you meet CSRD and ESRS E3 standards with confidence.
