Water pollution under Section 324 StGB

By Dr. Julius Hagen, Attorney at Law

When a test result becomes a criminal allegation

A discharge pipe, an operational failure or an unusual sample can trigger an investigation for water pollution. Section 324 StGB requires more than proof that a substance was found in water. The protected water body, the relevant deterioration, the pathway and personal attribution must be established.

In commercial cases, the decisive information is usually spread across permits, plant controls, self-monitoring and laboratory records. A defensible response therefore starts with a timeline of the event. Only then should the company decide what information to provide to investigators and water authorities.

Protected water and required result

The statutory water-body definition covers surface water, groundwater and the sea. Water in a tank, retention system or treatment plant is not automatically the protected object of Section 324; the connection with the natural water cycle matters. If a collected liquid mixture escapes, the receiving water may be affected.

Section 324 distinguishes pollution by introducing substances from another adverse change in water properties. In both forms, the change must be material. Flow, size and depth, the amount and properties of the substance and prior pollution may be relevant. A purely visual or aesthetic nuisance is not necessarily enough.

Impact and the permit position

Typical cases involve wastewater, cooling or process water, firefighting water, leaks or contaminated rainwater. The route may be direct or indirect. Proximity between the facility and the water body is therefore only an initial indication; the technical pathway must be shown.

“Unauthorised” concerns the legal basis for the water use. The permit and its conditions, together with water and wastewater rules, form the framework. The Waste Water Ordinance sets minimum requirements for different sources of discharge. That does not create a mechanical equation between an exceedance and a completed criminal offence.

The function of a value also matters. A monitoring value may describe the measurement and control method used under a permit; the criminal question of deterioration remains separate. Conversely, a discharge outside the permit may be relevant even if the case cannot be reduced to a single test result.

What samples and expert reports establish

A laboratory report links a substance to a sample taken at a particular place and time. Sampling, transport, analysis and comparison samples must therefore be examined. Background levels, dilution, flow and weather conditions and other possible sources also matter.

Where the water body was already polluted, its earlier condition is central. Proof that a discharge occurred does not automatically prove a further material deterioration. A time series may be more informative than an isolated peak. Repeated observations can support an allegation of continuing discharge where the overall context is reliable.

Causation is both technical and legal

Oil, chemical and heavy-metal cases often turn on expert evidence. A chemical fingerprint may support a source hypothesis, but it does not by itself establish the origin with sufficient certainty or the operation’s actual contribution to the deterioration. Multiple sources, mixing and earlier releases must be considered.

The defence must relate the technical meaning of a measurement or dispersion model to the alleged discharge. The location of the discharge point, its timing in relation to an operational event and identifiable measurement uncertainty are particularly relevant. Regulatory parameters assist the assessment but cannot alone prove the criminal result and causation.

Intent, negligence and omissions

Section 324(1) provides for imprisonment of up to five years or a fine for intentional water pollution; attempt is punishable. Under subsection 3, negligent conduct carries imprisonment of up to three years or a fine. The subjective analysis concerns knowledge of the relevant facts and, for negligence, breach of the required standard of care.

An omission requires a concrete duty to act and the ability to prevent the deterioration. In a company, that duty may arise from control over a facility, an assumed monitoring function or a specific protective responsibility. Formal office or designation does not by itself establish attribution; the relevant duties, information and decision-making power must be identified.

Management and internal responsibility

Investigations often focus on a managing director or technical manager while the evidence comes from the operation as a whole. Delegations, approvals, self-monitoring and incident organisation must be examined. The timing of knowledge and the action realistically available to the person are equally important.

The company may face regulatory, financial and confiscation-related consequences alongside individual liability. A sound response connects hazard control with a controlled internal investigation. Remediation decisions, communication with authorities and personal statements should be coordinated without being conflated.

After sampling, a search or an official hearing

After official sampling or a search, record the place, time, plant components, people present and documents taken. The technical reconstruction should cover operating states, maintenance, failures and drainage routes. A spontaneous statement made while the event is still being reconstructed can make later clarification more difficult.

Immediate measures to protect the water body may be necessary. They should be planned so that the cause analysis and preservation of comparison samples are not unnecessarily compromised. Criminal defence must keep factual hazard control separate from the question which individual may be attributed the offence.

Distinguishing neighbouring environmental offences

This page focuses on adverse change to a water body under Section 324. Waste, waste treatment and cross-border shipment require separate assessment under the relevant waste offences. Soil contamination raises the distinction from Section 324a; unauthorised operation of a facility or an emissions offence may also be relevant.

Whether an unusual test result supports a criminal allegation depends on the condition of the water body, the pathway and the permit position. Personal attribution must then be assessed separately. Until those links are established, the same finding may indicate a regulatory need for investigation or action rather than a completed criminal case.

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