Yvelines · Île-de-France · 236,416 residents · Chair: Lorrain Merckaert
Communauté d'agglomération de Saint-Quentin-en-Yvelines
€244.5 million spent in 2025.
€1,034 per resident · Urban-area groupings of the same size: €702
What Communauté d'agglomération de Saint-Quentin-en-Yvelines spends, by policy
The 4 other items (5%)
Source: 2025 accounts of Communauté d'agglomération de Saint-Quentin-en-Yvelines (DGFiP), by public policy.
Where the money goes
The €244.5M spent in 2025, by who receives it.
Source: 2025 accounts of Communauté d'agglomération de Saint-Quentin-en-Yvelines (DGFiP).
Contracts state a maximum amount for their whole term, often several years. That amount differs from what was paid. Purchases, services and works paid to companies by the intercommunality in 2025: €125.5M (its accounts).
- Eurovia Ile de France4 contracts over 4 months to 4 years · at most ~€9.4M a year on average · 3 of them framework agreements (maximum envelopes)up to €36.4M
- Sepur2 contracts over 5 years · at most ~€3.3M a year on averageup to €16.3M
- Viry-Acml1 contract over 17 months · at most ~€4.2M a year on averageup to €6M
- Multi Gestion Services1 contract over 4 years · at most ~€1.4M a year on average · framework agreement: maximum envelopeup to €5.4M
- Marcel Villette2 contracts over 3.5 to 4 years · at most ~€1.4M a year on average · framework agreements: maximum envelopesup to €5.1M
- M.T.P1 contract over 2 years · at most ~€1.8M a year on averageup to €3.6M
- Société Francilienne d'Espaces Verts1 contract over 4 years · at most ~€680k a year on average · framework agreement: maximum envelopeup to €2.7M
94 contracts signed in 2025 · €104.5M before tax
Why this total differs from the €125.5M of purchases, services and works paid to companies
These are the amounts of the contracts signed in the year, over their whole length, not what was paid. The money paid in a year also goes to older contracts and to purchases too small to be published (under €40,000 excl. VAT). For a framework agreement, the amount is a ceiling.
Investment and works
€62.2M of capital spending in 2025 (building, renovation, equipment), €263 per resident. Urban-area groupings of the same size: €114.
Click a building site to see the contract
- Entretien des voies et des équipements en groupement de commandes2025 · Eurovia Ile de France€12M
- Travaux de construction d’un ouvrage de franchissement dédié aux modes actifs…2025 · Viry-Acml€6M
- Travaux de remplacement et de réparation des appareils d’appuis d’ouvrages d’art de Saint-Quentin-en-Yvelines2024 · Freyssinet France€5M
- Modernisation et extension du théâtre de Saint-Quentin-en-Yvelines2024 · 2 companies€3.7M
- Réalisation de la section 5 du TCSP sur la commune de Trappes2024 · 2 companies€3.7M
Largest works contracted since 2023, among published contracts. Amounts planned at signature, often spread over several years.
On top of that, €11.5M paid to other bodies for their own equipment (towns, intercommunalities, associations…).
Source: 2025 accounts of Communauté d'agglomération de Saint-Quentin-en-Yvelines (DGFiP), by public policy.
Revenue and financing
Revenue: €220.6M · borrowing: €37.5M · spending: €244.5M.
Source: OFGL, 2025 accounts of the main budget.
Debt and taxes
€1,413 of debt per resident
Urban-area groupings of the same size: €781
7.7 years of savings to repay it
€13 of local taxes per resident
Urban-area groupings of the same size: €49
2025 accounts. Debt and taxes: OFGL, consolidated (main and side budgets). Per resident: amount divided by the population (Insee). “Urban-area groupings of the same size”: median of the 94 urban-area groupings of 100,000 to 365,000 residents.
The levels above Communauté d'agglomération de Saint-Quentin-en-Yvelines
Spending per resident in 2025, and what each level pays for.
- IntercommunalityCommunauté d'agglomération de Saint-Quentin-en-YvelinesWaste, water, urban transport, economic development€1,034 per resident
- DépartementYvelinesMinimum income, elderly and disability care, middle schools, county roads€1,057 per resident
- RegionÎle-de-FranceHigh schools, regional trains, training, business support€465 per resident
Each amount is what the body spends per resident, from its accounts (DGFiP). Do not add them up: part of the money passes from one body to another.
Who is part of Communauté d'agglomération de Saint-Quentin-en-Yvelines
Understanding these figures
Who does what
The intercommunality collects and treats waste, often runs water and sanitation, organises urban transport, and pays part of its revenue back to its member towns.
Why the levels are not added up
The same euro can appear twice: once when a region or a département pays a grant, again when the town spends it. Each page shows its own body’s spending.
Where these figures come from
Spending: the accounts of the main budget published by the DGFiP, by public policy. Revenue, debt and taxes: OFGL. Contracts: published contract data (DECP), amounts planned at signing.
Elected officials and staff of Communauté d'agglomération de Saint-Quentin-en-Yvelines: to report a figure to correct or add context, write to Qipu.
Page edited by Qipu, independent of Communauté d'agglomération de Saint-Quentin-en-Yvelines · Sources and method
Accounts 2025 (DGFiP, OFGL). The method · See the source