Directive 91/271/EEC maturity · Compliance with urban wastewater treatment
Your collection, treatment and self-monitoring obligations, measured against Directive 91/271/EEC and translated into a costed action plan.
9 themes, a 5-level scale. And the action that moves each level to the next.
The framework’s 9 themes, already written from L1 to L5. One company, one business unit, or 300 at once.
Directive 91/271/EEC maturity · Compliance with urban wastewater treatment
9 themes, 5-level scale.
Nordhavn Industries
53 / 100
They measure their maturity with Datamensio
An example
This could be your situation.
Take one company as an example: three sites, three spreadsheets, no shared answer.
Nobody can consolidate.
Nordhavn Industries, 2,400 people in Hamburg, Lyon and Porto. A client asks where the group stands. Each site answers in its own spreadsheet, with its own scales.
Three weeks, a single base.
One Council Directive 91/271/EEC of 21 May 1991, concerning urban wastewater treatment assessment launched across all three sites at once, from the managers’ interview notes. The framework was already written, its 9 themes and levels L1 to L5 too.
Two costs avoided before being committed.
A score of 53 out of 100, with the gap concentrated on three themes. The AI companion spotted that two actions duplicated those of another audit. The committee report took one sentence to request.
What it saved them
- 3sites measured on the same base, instead of three questionnaires to reconcile
- 2duplicate actions caught before the spend
- 1committee report, with no manual rework
These figures are an example. They could be yours.
The standard imposes processes. Datamensio says where you stand.
01
The framework is already written
Themes, questions and levels L1 to L5, all written. You do not start from an empty spreadsheet.
02
The score lands the same day
Online, by self-assessment link or in interview. Theme by theme, comparable over time.
03
The gap becomes a costed plan
Every step up carries its action. The AI prioritises on expected effect, not on the order of the standard.
04
Progress can be demonstrated
Campaign after campaign, against your target and against your own past. That is what your board asks for.
The maturity scale
One level, the next, and the action that links the two.
It is this mechanism, a level, a higher level, and the action that links the two, that turns a finding into a trajectory.
Does discharge self-monitoring produce reliable data that is actually used to run the installation?
- N1
No formalised self-monitoring programme. Measurements are taken occasionally, at the inspector’s request or after an incident.
- N2
A programme exists and samples are taken, but frequencies are not always met and results remain archived without being used.
- N3
The programme is applied at the planned frequencies, results are consolidated into a periodic report and exceedances lead to a tracked action.
- N4
Measuring equipment is tracked through metrology, deviations are analysed for root causes and results are reviewed with operations at every performance review.
- N5
Data feeds into the management of works and investment decisions, with multi-year comparison between sites and documented revision of the monitoring programme.
Action to move from L2 to L3
Consolidate analysis results into a single monthly report, add it to the agenda of the existing operations review, and open an action sheet for each limit value exceedance with an owner and a closing date.
« With Datamensio, we meet our objectives far more efficiently. The ERDF inspection services and our supervising ministry particularly appreciated an approach that gives them reliable data. »
Director, CCI 94CCI Île-de-France
« We believe this is the most suitable solution to scale our transformation project and measure impact according to our needs. »
Maja SucekChief Operating Officer, Interreg Danube
Rarely on its own
Frameworks combine. Put several together to cover your business, or have the AI write yours.
Take your first measurement
What this framework covers
Directive 91/271/EEC governs the collection, treatment and discharge of urban wastewater, as well as biodegradable industrial wastewater comparable to it. It works in population equivalents, requires secondary treatment for agglomerations above the thresholds it sets, and more rigorous treatment for nitrogen and phosphorus when discharge occurs in a sensitive area. It also sets the rules for connecting industrial discharges to public networks, prior authorisation, self-monitoring of installations and management of the sludge produced.
On a mining site or extractive facility, application runs into scope questions. Do mine dewatering water, process water and sanitary water follow separate streams, or do they mix upstream of the discharge point? Is the connection to the collective network backed by an up-to-date discharge authorisation, with limit values consistent with the receiving plant’s capacity? Does self-monitoring produce usable data, or archived results that no one reviews between inspections? These three points account for most of the gaps observed.
One point of context not to miss: Directive 91/271/EEC has been replaced by Directive (EU) 2024/3019, adopted at the end of 2024, which lowers the application thresholds, extends quaternary treatment for micropollutants to the largest plants, introduces energy neutrality for the sector, and expands producer responsibility for pharmaceutical and cosmetic manufacturers. Transposition opens a period during which both texts coexist within current authorisations. A common mistake is to treat the subject as a closed regulatory file: it becomes an investment programme again.
A compliance audit concludes with a gap or a compliance finding at a given discharge point, on a given date. A maturity assessment answers a different question: at what level of control do the knowledge of flows, the reliability of self-monitoring, the traceability of sludge and the anticipation of upcoming requirements sit, and what precise action moves each of these subjects to the next level. That is what allows you to prioritise between several sites showing the same compliance finding but not the same robustness.
In Datamensio, the framework is ready to use and remains yours. The AI adjusts themes, questions and level wording to your setup, whether an on-site plant or a connection to the collective network, or builds a variant from your permits, discharge authorisations and self-monitoring reports.
Reference standard: Council Directive 91/271/EEC of 21 May 1991, concerning urban wastewater treatment
The themes assessed
Knowledge of flows and scope of application
Inventory of discharge points, calculation and updating of the population equivalent load, separation of mine dewatering, process, rainwater and sanitary streams, network plans.
Collection systems
Condition and watertightness of networks, management of infiltration water, storm overflows and monitoring of overflow events, design against best available techniques.
Authorisations and industrial connections
Permits and discharge authorisations, limit values, connection agreements, pre-treatment before discharge to the public network, periodic review of authorisations.
Treatment level and performance
Secondary treatment, more rigorous treatment in sensitive areas, removal rates for BOD5, COD, suspended solids, nitrogen and phosphorus, reliability of works under degraded conditions.
Self-monitoring and measurement reliability
Sampling programme and frequency, sampling points, calibration and metrology maintenance, accredited laboratories, management of non-conformities and exceedances.
Sludge management and recovery
Quantification, destination streams, characterisation of content, registers and delivery notes, recovery or disposal contracts, upstream to downstream traceability.
Reporting and relations with authorities
Submission of regulatory data, reporting, responses to inspections, public information and transparency on installation performance.
Operations, competence and continuity
Operating instructions, operator qualification, standby duty, management of breakdowns and bypasses, subcontracting agreements and contractor oversight.
Anticipating the 2024/3019 overhaul
Monitoring transposition, lower thresholds, micropollutants and quaternary treatment, energy neutrality, associated investment trajectory.
A short version of the framework is available for the online self-assessment.
Frequently asked questions
Does this assessment amount to a certificate of compliance with the directive?
No. Compliance is established with the competent authority, based on your authorisations and your self-monitoring data. The assessment measures the maturity of your system, identifies gaps and prepares you for inspection. It issues no certification.
How does this differ from a regulatory compliance audit?
The audit settles matters item by item, compliant or not, on a given date. The assessment places your practices on a five-level maturity scale and indicates the action that moves each theme forward. The two complement each other: the assessment prioritises, the audit validates.
Is Directive 91/271/EEC still the right framework?
It remains the basis for authorisations in force during the transposition of Directive (EU) 2024/3019, which repeals it and tightens several requirements. The framework covers current obligations and includes a theme dedicated to anticipating the new text, so the action plan does not need reworking.
How long does the assessment take?
The short version is completed in 20 to 30 minutes by an environmental manager. The full version, run collaboratively, generally takes one to two weeks: most of the time goes into gathering self-monitoring reports and sludge registers from operations.
Our site has no on-site plant, it is connected to the collective network. Does the framework apply?
Yes, with a different centre of gravity. Themes on the discharge authorisation, pre-treatment, flow characterisation and contractor oversight become priorities. The AI adjusts questions to this setup.
Can the framework be adapted to our permits?
Yes. You can modify the questions, levels and themes, or have a variant generated from your prefectural permits and connection agreements. The framework is yours.
Can several sites be compared with each other?
Yes. Assessments run on the same framework can be compared by business unit and by theme, and set against previous campaigns. The AI groups gaps into a consolidated roadmap at portfolio level.
Where is the data hosted?
In France, with OVH, backed up with Scaleway. No transfer outside the European Union. The AI models used can be selected, including from European solutions.