Urban WastewaterTreatment Directive
Obligations and milestones

Large WWTPs from 150,000 p.e.

An accelerated timetable for tertiary and quaternary treatment at the largest plants.

Back to the obligation overview
Topic context

What is changing and why preparation matters

Plants with a load of at least 150,000 p.e. follow specific, faster schedules for nutrient and micropollutant removal.

The scale and technical dependencies call for early audits, option selection, permitting, finance and commissioning plans.

Timeline

Obligations and their practical meaning

Each block has a permanent link. Always verify the exact scope against the agglomeration and plant profile and the final Czech implementation.

Preparation and planning

Prepare the accelerated tertiary- and quaternary-treatment programme for the largest plants.

Preparation: 2027–2030#large-treatment-preparation

Large WWTP from 150,000 p.e.

Prepare the accelerated tertiary- and quaternary-treatment programme for the largest plants.

What this means in practice

Coordinate the technology audit, project design, permits, financing, outages and evidence for the capacity counted against each milestone.

  • Technology audit, implementation timetable and treatment-performance evidence.
  • Implementation period: 2027–2028.
  • Keep the evidence traceable and ready for reporting.

Scope and evidence

Who it applies to: Plants with a design load of at least 150,000 p.e.

Evidence: Technology audit, implementation timetable and treatment-performance evidence.

Why this step matters

The largest plants account for a substantial share of total load and can deploy advanced treatment at scale.

Legal context: Special timetable for plants from 150,000 p.e.

First requirements

Prepare the accelerated tertiary- and quaternary-treatment programme for the largest plants.

Preparation: by 2033#large-preparation-2030

Large WWTP from 150,000 p.e.

Prepare the accelerated tertiary- and quaternary-treatment programme for the largest plants.

What this means in practice

Coordinate the technology audit, project design, permits, financing, outages and evidence for the capacity counted against each milestone.

  • Technology audit, implementation timetable and treatment-performance evidence.
  • Implementation period: 2030.
  • Keep the evidence traceable and ready for reporting.

Scope and evidence

Who it applies to: Plants with a design load of at least 150,000 p.e.

Evidence: Technology audit, implementation timetable and treatment-performance evidence.

Why this step matters

The largest plants account for a substantial share of total load and can deploy advanced treatment at scale.

Legal context: Special timetable for plants from 150,000 p.e.

Broader requirements

Prepare the accelerated tertiary- and quaternary-treatment programme for the largest plants.

National milestone: 2033#large-tertiary-30-quaternary-20

Large WWTP from 150,000 p.e.

Prepare the accelerated tertiary- and quaternary-treatment programme for the largest plants.

What this means in practice

Coordinate the technology audit, project design, permits, financing, outages and evidence for the capacity counted against each milestone.

  • Technology audit, implementation timetable and treatment-performance evidence.
  • Implementation period: 2032–2033.
  • Keep the evidence traceable and ready for reporting.

Scope and evidence

Who it applies to: Plants with a design load of at least 150,000 p.e.

Evidence: Technology audit, implementation timetable and treatment-performance evidence.

Why this step matters

The largest plants account for a substantial share of total load and can deploy advanced treatment at scale.

Legal context: Special timetable for plants from 150,000 p.e.

Stricter targets

Prepare the accelerated tertiary- and quaternary-treatment programme for the largest plants.

National milestone: 2036#large-tertiary-70

Large WWTP from 150,000 p.e.

Prepare the accelerated tertiary- and quaternary-treatment programme for the largest plants.

What this means in practice

Coordinate the technology audit, project design, permits, financing, outages and evidence for the capacity counted against each milestone.

  • Technology audit, implementation timetable and treatment-performance evidence.
  • Implementation period: 2036.
  • Keep the evidence traceable and ready for reporting.

Scope and evidence

Who it applies to: Plants with a design load of at least 150,000 p.e.

Evidence: Technology audit, implementation timetable and treatment-performance evidence.

Why this step matters

The largest plants account for a substantial share of total load and can deploy advanced treatment at scale.

Legal context: Special timetable for plants from 150,000 p.e.

Advanced implementation

Prepare the accelerated tertiary- and quaternary-treatment programme for the largest plants.

National milestone: 2039#large-tertiary-100-quaternary-60

Large WWTP from 150,000 p.e.

Prepare the accelerated tertiary- and quaternary-treatment programme for the largest plants.

What this means in practice

Coordinate the technology audit, project design, permits, financing, outages and evidence for the capacity counted against each milestone.

  • Technology audit, implementation timetable and treatment-performance evidence.
  • Implementation period: 2039.
  • Keep the evidence traceable and ready for reporting.

Scope and evidence

Who it applies to: Plants with a design load of at least 150,000 p.e.

Evidence: Technology audit, implementation timetable and treatment-performance evidence.

Why this step matters

The largest plants account for a substantial share of total load and can deploy advanced treatment at scale.

Legal context: Special timetable for plants from 150,000 p.e.

Long-term objectives

Prepare the accelerated tertiary- and quaternary-treatment programme for the largest plants.

National milestone: 2045#large-quaternary-100

Large WWTP from 150,000 p.e.

Prepare the accelerated tertiary- and quaternary-treatment programme for the largest plants.

What this means in practice

Coordinate the technology audit, project design, permits, financing, outages and evidence for the capacity counted against each milestone.

  • Technology audit, implementation timetable and treatment-performance evidence.
  • Implementation period: 2045.
  • Keep the evidence traceable and ready for reporting.

Scope and evidence

Who it applies to: Plants with a design load of at least 150,000 p.e.

Evidence: Technology audit, implementation timetable and treatment-performance evidence.

Why this step matters

The largest plants account for a substantial share of total load and can deploy advanced treatment at scale.

Legal context: Special timetable for plants from 150,000 p.e.

Related content

Interpretations and important terms

Find more detail on legal concepts and the Czech approach in the related interpretations and glossary.

Related interpretations and tools

Glossary terms