Why do we need new wastewater treatment rules?
The previous European rules were introduced more than thirty years ago. Wastewater treatment has improved considerably since then, but new challenges have emerged: pharmaceutical residues and other micropollutants, microplastics, and the need to manage water and energy more efficiently. The recast Directive extends and strengthens requirements to better protect the water environment and human health.
Will more wastewater be treated than today?
Yes. Collection and treatment requirements will progressively extend to smaller agglomerations from 1,000 population equivalents (p.e.). This lowers the threshold compared with the previous rules, which focused mainly on larger agglomerations. The aim is to make effective wastewater treatment standard in smaller settlements too.
Does every municipality with over 1,000 residents need its own treatment plant?
Not necessarily. The Directive uses the concept of an agglomeration, rather than simply the population of one municipality. This is an area where settlements, industry and other wastewater-generating activities are concentrated enough for wastewater to be collected and treated together. In exceptional cases, such as where a common sewer is technically impracticable or disproportionately costly, individual systems may be used. They must provide the same level of environmental and health protection as collective treatment, with proper operation and inspection.
Will treatment plants also remove medicines and other chemicals?
Selected larger plants will. The Directive introduces quaternary treatment to substantially reduce selected micropollutants, such as pharmaceutical residues and substances used in cosmetics, that conventional biological treatment cannot remove sufficiently. These substances can pose risks to aquatic ecosystems and human health even at very low concentrations. Water is part of one connected cycle: wastewater treatment in one place directly affects the quality of drinking-water sources elsewhere.
Who will pay for new micropollutant-removal technologies?
Producers of medicines and cosmetics are expected to cover a significant share through extended producer responsibility (EPR). Following the polluter-pays principle, the Directive requires producers in these sectors to cover at least 80% of the defined costs of quaternary treatment and related monitoring.
Will the Directive make rivers and lakes cleaner?
That is one of its main aims. As well as addressing micropollutants, it tightens requirements for nitrogen and phosphorus removal. These nutrients can cause eutrophication: excessive growth of algae and cyanobacteria that reduces water quality in rivers and lakes.
What does energy neutrality mean for treatment plants?
The Directive aims to reduce the sector’s energy demand while increasing its energy generation. Wastewater contains energy as heat and in chemical form. Plants can use biogas, solar power, heat pumps and other renewable sources. The energy-neutrality target is assessed through the national balance of the plants concerned; it does not require every individual plant to be self-sufficient.
Can wastewater help us monitor epidemics?
Yes. Wastewater carries information about the population connected to the sewer and can provide early warning. The Directive provides for public-health surveillance, including monitoring selected viruses or antimicrobial resistance genes. This approach has already proved useful in tracking COVID-19. How early a signal is detected also depends on sampling frequency and the speed of analysis.
Will the new Directive increase wastewater charges?
It will bring new investment and operating costs, but the effect on charges will vary. The work needed depends on the condition of local sewers and treatment plants; overall costs also depend on financing and how European rules are transposed into Czech law. Some measures, particularly in energy management, can reduce operating costs. Producers of medicines and cosmetics are also expected to contribute to removing selected micropollutants.
When will people notice the changes?
The changes will be gradual. The Directive sets phased deadlines for the main measures up to 2045. Czechia must transpose the European rules into national law and prepare an implementation programme. Some measures will become visible within a few years, while others will take decades. Specific obligations and deadlines depend on size and local conditions.
What does wastewater treatment have to do with rain?
Heavy rain can bring more water into sewers than they can safely convey. The Directive therefore connects sewer planning with measures that retain water, support infiltration or slow runoff.
