Contaminated Water and Human Health: Who Is Responsible When Communities Become Ill?

Clean water is essential for human health. It is used for drinking, preparing food, washing and maintaining basic hygiene. When a community’s water supply becomes contaminated, the consequences can be serious, particularly when residents are exposed over an extended period.

Contaminated water may contain harmful bacteria, viruses, chemicals or other pollutants. Depending on the source and level of exposure, it can contribute to illnesses such as diarrhoeal diseases, infections and other health complications. Children, older people and individuals with weakened immune systems may face greater risks.

In South Africa, communities have a constitutional right of access to sufficient water and an environment that is not harmful to their health or well-being. When contaminated water causes illness, an important question arises: who is legally responsible for protecting residents and addressing the harm?

The answer depends on where the contamination originated, who had a legal responsibility to prevent it and whether a failure to meet that responsibility caused the harm suffered.

The right to clean water and a healthy environment

The Constitution of the Republic of South Africa, 1996, provides important protections relating to water, health and the environment.

Section 27(1)(b) recognises everyone’s right to have access to sufficient water. Section 24 also provides that everyone has the right to an environment that is not harmful to their health or well-being. It requires reasonable legislative and other measures to prevent pollution and ecological degradation.

These rights are particularly important when communities depend on a shared water supply. Residents should not be exposed to preventable health risks because pollution is ignored or water services are inadequately managed.

However, the constitutional right to water does not automatically mean that every illness associated with contaminated water gives rise to a compensation claim. Legal responsibility must be assessed according to the circumstances, the relevant duties and the available evidence.

Who is responsible when water becomes contaminated?

Responsibility is not always limited to one institution. Depending on the circumstances, several parties may have duties relating to water quality, pollution prevention and public health protection.

1. Municipalities and water services authorities

Municipalities play an important role in providing local water and sanitation services.

Under the Water Services Act 108 of 1997, water services authorities have responsibilities to progressively ensure access to water services. The Act also provides for compulsory national standards governing the provision of water services.

Where a municipal water supply becomes contaminated, the responsible authority may need to investigate the problem, arrange appropriate testing, take corrective action and communicate health warnings to affected residents.

For example, if sewage enters a municipal water supply and residents begin reporting illnesses, the circumstances may raise questions about whether the municipality properly maintained its infrastructure, monitored water quality and responded to complaints.

A municipality may face legal consequences if it fails to fulfil a relevant legal duty and that failure causes harm. However, liability depends on the evidence and the legal requirements of the particular claim.

2. The Department of Water and Sanitation

The Department of Water and Sanitation has national responsibilities relating to water resource management, regulation and oversight.

Its functions include setting national standards, monitoring aspects of water services and supporting or intervening where water services authorities fail to meet their responsibilities.

Where water pollution threatens public health, the Department may have regulatory responsibilities depending on the source and nature of the contamination.

This does not mean that the Department automatically becomes liable whenever a municipality experiences a water quality problem. Its potential responsibility must be assessed against its particular statutory duties, knowledge of the problem and actions or omissions in the circumstances.

3. Businesses and industrial operators

Water contamination may also result from activities carried out by private businesses.

Industrial waste, mining activities, chemical spills, improper waste disposal and other operations can introduce harmful substances into rivers, groundwater and other water resources.

Section 19 of the National Water Act 36 of 1998 places a duty on owners of land, persons in control of land and those who occupy or use land to take reasonable measures to prevent pollution where activities or conditions on that land cause, have caused or are likely to cause pollution of a water resource.

These measures may include stopping or controlling the activity responsible for pollution, containing pollutants, removing the source and remedying the effects.

A business whose activities contaminate a water resource may therefore face regulatory action and, where the legal requirements are established, civil liability for harm caused to affected people.

4. Other parties responsible for pollution

Not every contamination incident involves a municipality or large industrial operator.

Individuals, contractors, property owners and other organisations may also contribute to pollution through negligent activities, improper waste management or failure to take reasonable preventative measures.

The National Water Act provides mechanisms for addressing pollution and recovering costs from responsible parties. The circumstances must be investigated to establish who caused or contributed to the contamination and what legal duties applied.

How can contaminated water affect human health?

The health consequences depend on the type of contaminant, the concentration, the duration of exposure and the health of the person affected.

Contaminated water may expose residents to disease-causing microorganisms or harmful chemicals.

Possible consequences include:

* Gastrointestinal illness: Exposure to harmful microorganisms may cause diarrhoea, vomiting and stomach cramps.

* Infections: Certain bacteria, viruses and parasites can cause infections that require medical treatment.

* Chemical exposure: Some pollutants may cause health effects depending on the substance, concentration and duration of exposure.

* Dehydration: Severe diarrhoeal illness and vomiting can lead to dehydration, which can be particularly dangerous for young children and older people.

* Long-term health complications: Certain contaminants may cause lasting harm, depending on the nature and extent of exposure.

It is important not to assume that every illness experienced by residents is necessarily caused by contaminated water. Medical assessment and appropriate water testing are often necessary to establish whether a connection exists.

Can affected residents claim compensation?

Where contaminated water causes illness or injury, affected residents may have grounds to consider a civil claim against a responsible party.

In South African law, a delictual claim may arise where the necessary legal requirements are established. These generally include wrongfulness, fault where required, causation and damage.

This means that a claimant may need to establish:

1. A legal duty or wrongful failure: There must be a basis for holding the defendant legally responsible for the conduct or failure to act.

2. Negligence or another recognised form of fault: Where negligence is relied upon, evidence must show that the responsible party failed to take reasonable steps that could have been expected in the circumstances.

3. Causation: The claimant must establish a legally sufficient connection between the contamination, the responsible party’s conduct and the illness suffered.

4. Actual harm or loss: There must be evidence of legally recognised injury or financial loss.

For example, a community may report repeated contamination concerns to the municipality. If the municipality has knowledge of a serious risk but fails to take reasonable steps to investigate or address it, and residents subsequently suffer illness linked to the contaminated supply, the circumstances may justify an investigation into possible liability.

However, proving that water was contaminated is not necessarily enough to prove that a particular party caused an individual’s illness. Medical evidence, laboratory results and other relevant information may be required.

What compensation may be available?

If a legal claim succeeds, the damages recoverable will depend on the nature of the harm and the evidence presented.

Depending on the circumstances, a claim may include:

* Reasonable medical and hospital expenses.

* Future medical treatment and rehabilitation costs.

* Loss of income where the affected person has suffered an inability to work.

* Loss of future earning capacity where supported by the evidence.

* General damages for pain, suffering and loss of amenities of life, where legally recoverable.

Where children are affected, the long-term consequences of an illness or injury may need to be considered. Their medical needs, development and possible future limitations may require specialist assessment.

Compensation is not automatic. Each claim must be assessed on its own facts and supported by appropriate evidence.

What evidence should affected communities collect?

Evidence is important both when reporting contamination and when considering possible legal action.

Residents who suspect that their water supply is contaminated should keep records of the problem and any resulting illness.

Important evidence may include:

1. Medical records

Keep medical reports, hospital records, prescriptions, laboratory results and records of treatment received by affected residents.

2. Water quality test results

Where possible, arrange testing through an appropriately qualified laboratory. Results should identify the source of the sample, the date of collection and the substances or microorganisms tested.

3. Photographs and videos

Document visible signs of contamination, sewage leaks, discoloured water, damaged pipes or other conditions that may help explain the problem.

4. Complaints and correspondence

Keep copies of complaints submitted to the municipality, water services provider or relevant government department. Record reference numbers and responses received.

5. Records of affected residents

Maintain a record of when symptoms began, where affected individuals obtained their water and whether other households experienced similar problems. Personal medical information should be handled confidentially.

6. Independent technical and medical assessments

Depending on the circumstances, expert evidence may be needed to establish the source of contamination, the nature of exposure and the connection between the exposure and the illness.

Residents should avoid drinking water that has been declared unsafe and follow official health instructions. They should also seek medical attention when symptoms develop, particularly where children or vulnerable individuals are affected.

What can communities do when authorities fail to respond?

Communities should not ignore repeated water quality concerns, especially when residents are becoming ill.

Practical steps include:

1. Report the suspected contamination to the relevant municipality or water services provider.

2. Request water quality testing and an investigation into the source of contamination.

3. Ask for written feedback on the findings and corrective measures.

4. Report suspected pollution to the Department of Water and Sanitation where appropriate.

5. Keep records of complaints, test results and any official warnings.

6. Seek medical assistance for affected residents.

7. Consider obtaining legal advice if the problem remains unresolved or residents have suffered harm.

Where pollution is ongoing, the appropriate legal response may involve seeking corrective action to stop the contamination, rather than focusing only on compensation after people have become ill.

What does South African case law say about municipal responsibility?

In Johannes Diederik Le Roux NO and Another v Nelson Mandela Bay Municipality [2025] ZASCA 122, the Supreme Court of Appeal considered a municipality’s failure to address a dangerous open drain after reports had been made about the risk to residents.

The Court found that the municipality’s knowledge of the danger, combined with its failure to take appropriate remedial action, gave rise to delictual liability in the circumstances. The case also considered the requirements of negligence and causation.

Although this case concerned an open drain and not contaminated drinking water, it illustrates an important legal principle: where a municipality has a relevant duty, knows about a serious danger and fails to take reasonable steps to address it, its conduct may give rise to liability if the other legal requirements are established.

In a water contamination matter, the specific source of pollution, the authority’s responsibilities, the evidence of prior complaints and the connection to the illnesses suffered would all need to be examined.

Conclusion

Contaminated water is not merely an environmental concern. It is a public health issue that can affect the safety, dignity and well-being of entire communities.

South African law places responsibilities on government institutions, water services authorities and parties whose activities cause pollution. Where a failure to meet a legal duty results in illness or injury, affected residents may have grounds to pursue legal remedies.

However, establishing responsibility requires more than showing that residents became sick. The source of contamination, the conduct of the responsible party, medical evidence and the connection between the exposure and the harm must all be carefully investigated.

Communities deserve access to safe water, timely information and effective action when contamination threatens their health.

Has contaminated water affected your household or community? Ndou Attorneys can assist in assessing the circumstances, identifying potential legal responsibility and explaining the legal options that may be available.