Environmental Crimes in Spain: When Discharges Are Criminal

The greening of European regulation, combined with heightened public awareness and prosecutorial focus, has made environmental criminal law one of the most dynamic areas of Spanish criminal practice. Understanding when a regulatory violation crosses the threshold into criminal territory is essential for any company operating in sectors with environmental impact.

When Does an Environmental Infraction Become a Crime?

Not every breach of environmental regulation is criminal. Art. 325 CP requires that the conduct can seriously harm the balance of natural systems or human health. Courts assess: the quantity and toxicity of the discharge or emission, the duration and persistence of the pollution, the reversibility of the damage, and whether prior administrative warnings or closures were ignored.

How Courts Assess Serious Harm

The factors courts weigh deserve closer attention, because they are where these cases are won and lost. Quantity and toxicity are established through sampling — and sampling methodology (where, when and how the samples were taken, and how they were preserved) is a classic battleground for the defence. Duration and persistence distinguish an isolated incident from a continuing practice. Reversibility asks whether the affected environment can recover naturally or needs intervention. And prior administrative warnings matter because a company that continued discharging after being warned or sanctioned will struggle to argue that it was unaware of the risk.

The threshold is one of potential, not of result: the offence does not require proof that the harm actually materialised, but that the conduct was capable of causing it. This makes the technical debate about capability the true centre of gravity of the trial.

Corporate Criminal Liability

Since 2010, Spanish companies can be directly convicted of environmental crimes under Art. 328 CP. Penalties for legal entities include fines up to four times the profit obtained from the offending activity, temporary or permanent closure of facilities, and disqualification from public contracts. A genuine environmental compliance program can provide a full exemption.

The Role of Environmental Compliance

For companies, the practical lesson of corporate criminal liability is that prevention must be documented. An environmental compliance programme follows the same logic as any criminal compliance system: identify the specific environmental risks of the activity (discharges, emissions, waste management), set written protocols and controls for each one, train the staff who operate the relevant installations, and supervise compliance with real authority. When an incident occurs despite those controls, the documented programme is the difference between corporate exemption and corporate conviction.

Defense Strategy

Effective defense in environmental cases requires early intervention: challenging the prosecution's technical measurements, commissioning independent expert reports, demonstrating that corrective measures have already been adopted, and questioning the causal link between the company's activity and the alleged harm.

What to Do When an Investigation Starts

Environmental investigations usually begin with an inspection, a complaint or an administrative file that is forwarded to the prosecutor. From that moment the company should: preserve all technical records of the installation; commission its own measurements and expert analysis as soon as possible, since environmental evidence degrades quickly; adopt and document corrective measures immediately — courts value remediation, and waiting until trial wastes that opportunity; and review the administrative file in detail, because defects in the inspections and measurements carried out by the authorities can undermine the technical basis of the accusation.

Why These Cases Are Technical

Unlike most criminal proceedings, environmental cases are decided largely on scientific evidence: laboratory analyses, dispersion models, ecological assessments. The legal question — whether the conduct could seriously harm natural systems or human health — depends entirely on that technical layer. This is why the defence cannot be improvised at trial: the expert work of contesting measurements, establishing alternative causes of the harm and quantifying the real impact has to start during the investigation phase, while samples can still be contrasted and installations inspected.