Industrial wastewater

Industrial wastewater encompasses effluent generated by manufacturing, processing, and production activities across a wide range of sectors, including food and beverage, textile, chemical, petrochemical, pulp and paper, and power generation. Unlike municipal sewage, industrial wastewater is highly variable in composition – it may contain heavy metals, organic solvents, oils and greases, persistent organic pollutants, high concentrations of nutrients, extreme pH levels, and elevated temperatures, depending on the industrial process involved. When inadequately treated or illegally discharged, industrial effluent can cause severe and sometimes irreversible damage to river systems, groundwater, and aquatic ecosystems.

In South Africa, the discharge of industrial effluent to water resources is regulated under the National Water Act (Act 36 of 1998), which requires any person wishing to discharge waste or water containing waste into a water resource to obtain a water use licence from the Department of Water and Sanitation. Industries may also discharge to municipal sewer systems under trade effluent agreements with the relevant municipality, provided the effluent meets the standards set by the local authority. Non-compliance with licence conditions and standards remains a significant challenge, and enforcement capacity is often limited.

The resources below provide access to regulatory frameworks, guidelines, research outputs, and tools relevant to industrial wastewater management in South Africa.

Regulatory Framework

Department of Water and Sanitation (DWS) – Water Use Licensing Industrial discharges to water resources require a water use licence under Section 21(f) of the National Water Act. The DWS manages the licensing process and sets special discharge standards for industrial effluent.

DWS General Authorisations Certain low-risk industrial discharges may qualify for General Authorisation rather than a full licence — the DWS General Authorisations define the conditions under which this applies.

General and Special Standards for Discharge of Effluent (Government Notice R272) The national standards governing the quality of effluent that may be discharged to water resources or municipal sewers, published under the National Water Act. Industries are required to meet these standards as a minimum condition of their discharge authorisation.

Research & Guidance

Water Research Commission (WRC) – Industrial Wastewater Research The WRC has funded numerous research projects on industrial wastewater treatment, resource recovery, and water reuse across South African industry. Search the WRC Knowledge Hub for reports on specific industries and treatment technologies.

UNEP – Industrial Wastewater Treatment and Reuse International guidance from the United Nations Environment Programme on best practice approaches to industrial wastewater treatment, minimisation, and reuse — relevant for benchmarking against global standards.

IFC Environmental, Health and Safety Guidelines – Industrial Wastewater The International Finance Corporation's sector-specific EHS guidelines provide internationally recognised effluent standards and treatment guidance for a wide range of industrial sectors — widely used in South African environmental impact assessment practice.

Water Reuse & Circular Economy

WRC – Water Reuse in Industry Research and guidance on the reuse of treated industrial effluent within industrial processes and for other beneficial uses, supporting water conservation and reducing freshwater abstraction.

GreenCape – Water Economy Sector GreenCape provides market intelligence and support for water-efficient and circular economy approaches in the Western Cape, including industrial water reuse and resource recovery from wastewater.

Key Industrial Sectors in South Africa

The following sectors are among the most significant sources of industrial wastewater in South Africa, each with distinct treatment challenges:

Food and beverage — high organic loads, fats, oils, and greases; wastewater from abattoirs, dairies, breweries, and fruit processing
Textile and leather — dyes, surfactants, salts, and heavy metals
Pulp and paper — high BOD/COD loads, chlorinated compounds, and colour
Chemical and petrochemical — solvents, heavy metals, hydrocarbons, and toxic organics
Power generation — cooling water, ash dam seepage, and fly ash leachate