Urban Wastewater Treatment Directive

The Urban Waste Water Treatment Directive (UWWT) (Council Directive 91/271/EEC) was adopted on 21 May 1991. The Directive concerns the collection, treatment and discharge of urban waste water and the treatment and discharge of certain industrial waste waters. Its aim is to protect the environment from the adverse effects of insufficiently treated urban waste water discharges and discharges of industrial waste water from food-processing industries.

Objectives and requirements

• Collection and treatment of waste water (including industrial waste waters) in all agglomerations with a population equivalent > 2000.
• Secondary treatment (i.e. biological treatment) as rule; more stringent treatment in sensitive areas and their catchments for agglomerations > 10000 p.e.
• Permit procedure for treatment plants, for discharges from the agro-food industry ( > 4000 p.e.) and for industrial discharges from urban waste water sewerage systems.
• Monitoring of performance on treatment plants and affected waters and controls on sewage sludge disposal / reuse.

Timeframe

Deadline	Task
31 December 1993	Designation of sensitive areas and identification of less sensitive areas Discharge of industrial waste water into collecting systems and urban waste water treatment plants subject to prior regulation and authorization Requirements for authorization of direct discharges of industrial waste water from food processing industries to surface water in place
31 December 1998	Collecting systems for agglomerations > 10000 p.e. where discharges are into a sensitive area and its catchment Disposal of sludge subject to registration or authorization Disposal of sludge to surface waters is banned
31 December 2000	Collecting systems for agglomerations > 15000 p.e. discharging into normal areas All discharges from agglomerations > 15000 p.e. subject to secondary treatment Direct discharges of industrial biodegradable waste water from plants of > 4000 p.e. to surface water subject to prior regulation/authorization
31 December 2005	Collecting systems for all agglomerations > 2000 p.e. All discharges from agglomerations 10000 –15000 p.e. subject to secondary treatment Discharges to freshwater and estuaries from agglomerations between 2000 and 10000 p.e. subject to secondary treatment Discharges to freshwater and estuaries from agglomerations < 2000 p.e. subject to appropriate treatment Discharges to coastal waters from agglomerations < 10000 p.e. subject to appropriate treatment

Obligations

The regulations have obligations for Member States in respect of the collection, treatment and monitoring of urban waste water.

Planning

1. Identify agglomerations and calculate the size (p.e.).
2. Inventory and current status (size, collecting systems, treatment level, monitoring systems, sludge management) of agglomerations > 2000 p.e.
3. Designate sensitive areas and identify their relevant hydraulic catchment areas and ensure that all discharges from agglomerations > 10000 p.e. located within the catchment must have collecting systems and more stringent treatment.
4. Establish less sensitive areas.
5. Establish a technical and financial programme for the construction of sewage collecting systems and waste water treatment plants.

Monitoring

Member States ensure that monitoring programs of discharges from urban waste water treatment plants and receiving waters are in place and that they correspond to the requirements in terms of parameters monitored, analytical method and sampling frequency.

References

Text of the Urban Wastewater Treatment Directive [1]

External links

European Commission, Urban Wastewater Directive Overview