Topic · sanitation & wastewater
Water governance debates tend to focus on what comes out of the tap. What goes down the drain gets less attention, though it often costs as much, harms rivers and seas when it fails, and is where the biggest global access gap lies. This page brings the numbers, the new EU rules and a practical check together.
The gap
Storm overflows
Many older cities have combined sewers that carry rainwater and sewage in the same pipe. When heavy rain overloads them, overflows release diluted but untreated sewage into rivers and the sea to stop it backing up into homes.
So what: overflows are a design legacy, but how often they spill is a governance choice about investment and enforcement.
In England, monitors on almost every storm overflow (99.1% of 2,341 listed in the 2024 data, per The Rivers Trust) turned an invisible problem into an annual public number: 450,398 spills lasting 3.61 million hours in 2024.
So what: ask whether every overflow in your area is monitored and whether the data is published.
The Environment Agency reported a 48% fall in spill duration in 2025, but put much of it down to a drier year. Year-to-year totals swing with rainfall, so they need careful reading.
So what: track spills per overflow against rainfall, and look at the worst-performing sites, not only the total.
EU law
Adopted in November 2024 to replace the 1991 directive, it widens the rules to smaller towns, adds treatment for micropollutants, sets an energy goal for treatment plants and makes the pharmaceutical and cosmetics industries pay for much of the extra treatment. Key obligations for boards to track:
| Obligation | Who it applies to | Deadline |
|---|---|---|
| Transposition into national law | All Member States | 31 Jul 2027 |
| Integrated urban wastewater management plans to tackle storm overflows and urban runoff | Agglomerations above 100,000 p.e.; at-risk agglomerations of 10,000–100,000 p.e. by 2039 | 2033 |
| Collection and secondary treatment extended to smaller towns | Agglomerations of 1,000–2,000 p.e. (previously from 2,000 p.e.) | 2035 |
| Tertiary treatment (nitrogen and phosphorus removal) | Plants of 150,000 p.e. and above | 2039 |
| Quaternary treatment (micropollutant removal), phased in | Plants of 150,000 p.e. and above (and smaller plants in at-risk areas) | 2045 |
| Extended producer responsibility: pharmaceutical and cosmetics producers pay at least 80% of the extra cost of quaternary treatment | Producers placing these products on the EU market | with quaternary |
| Energy neutrality: plants to cover their energy use with renewable energy they generate | Plants of 10,000 p.e. and above (national aggregate, phased) | 2045 |
p.e. = population equivalent, a measure of pollution load. Summary for discussion: check the directive text on EUR-Lex and your national transposition for exact scope, interim milestones and derogations.
Producer responsibility moves part of the treatment bill from households to the industries whose products leave residues in wastewater.
So what: make sure your tariff plan assumes the producer contribution, and ask how it will be collected.
Integrated management plans push cities to combine pipes, storage and green infrastructure such as rain gardens and permeable surfaces, which can be cheaper than building ever-larger sewers.
So what: ask who owns the plan when sewers, roads and parks sit with different departments.
Extending treatment to settlements of 1,000–2,000 p.e. lands on the authorities least able to finance it alone.
So what: check affordability and look at joint ventures between neighbouring municipalities early.
Interactive check · saves in this browser
Tick what is already in place. Gaps stay visible, and your summary feeds the board briefing pack.
Are plants meeting their permits, and is anyone checking?
Compliance that is only reported to the regulator can't be scrutinised by the people living downstream.
2033–2045 deadlines sound distant, but treatment upgrades take a decade to plan, finance and build.
Sludge carries metals, microplastics and PFAS. Disposal routes can close at short notice.
Incidents reveal operational weaknesses long before formal enforcement does.
Do you know when and where untreated sewage leaves the system?
England's experience shows that public data on every overflow changes priorities.
A short list of sites usually causes most harm. Totals alone hide them.
Sewers are renewed even more slowly than water mains. Check the renewal gap.
Keeping rainwater out of sewers can be cheaper than building bigger tanks.
Who pays for treatment, and how are owners and operators held to account?
Mixed accounts make it impossible to see whether wastewater is under-funded.
Industry is meant to pay at least 80% of the extra cost of micropollutant removal in the EU.
England's debate shows how financial structures can drain money from maintenance.
Penalties that nobody hears about change little.
Does everyone have a safe toilet, and who bears the burden when the system fails?
You can't close a gap you haven't mapped, including informal settlements and rural fringes.
"Safely managed" sanitation includes what happens to the waste after it leaves the home.
The recast EU directive asks Member States to improve access to sanitation, especially for vulnerable groups.
Wastewater is often half the bill. Include it when you run the affordability calculator.
Sources