Yvelines · Île-de-France · 236,416 residents · Chair: Lorrain Merckaert

Communauté d'agglomération de Saint-Quentin-en-Yvelines

€244.2 million spent in 2025.

€1,033 per resident · Urban-area groupings of the same size: €687

What Communauté d'agglomération de Saint-Quentin-en-Yvelines spends, by policy

Administration and shared services17%€41.5M
Bodies do not all file the same costs here: some put all their staff under it.
Loans: repayments and interest16%€38.5M
Town planning and housing15%€37.8M
Streets and transport15%€36.1M
Waste, water and environment14%€35.1M
Culture, sport and youth11%€27.4M
Public safety5%€11.4M
Economy and trade1%€3.1M

The 4 other items (5%)

Health and social care1%€2.3M
Education1%€2.1M
Passed on to other bodies< 1%€1M
Not assigned to a policy3%€7.8M

Source: 2025 accounts of Communauté d'agglomération de Saint-Quentin-en-Yvelines (DGFiP), by public policy.

Suppliers and recipients

The same €244.2M, by recipient.

Companies and contractors51%€125.5M
See the names ↓
Staff17%€40.8M
Pay and contributions.
Banks and lenders16%€38.5M
Grants and contributions10%€24.5M
Compulsory contributions4%€10.5M
Joint bodies and syndicates< 1%€1M
Benefits paid to people< 1%€5k
Other1%€3.5M
Councillors’ allowances, taxes paid, other costs.

Source: 2025 accounts of Communauté d'agglomération de Saint-Quentin-en-Yvelines (DGFiP).

66 contracts signed in 2025 · €99.8M before tax

Why this total differs from the €125.5M 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

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: €244.2M.

Breakdown of resources

Taxes (business and household taxes, VAT share)40%€103.6M
State and other contributions28%€72.6M
Grants for works and VAT refunds13%€32.9M
Users and rents3%€7.6M
Other receipts1%€3.8M
Borrowing15%€37.5M

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
€1,033
DépartementYvelinesMinimum income, elderly and disability care, middle schools, county roads
€1,045
RegionÎle-de-FranceHigh schools, regional trains, training, business support
€459

Each row: the body’s own spending per resident, the figure at the top of its page (DGFiP). Not to be added up: a grant from one level is spent by 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.

Official table of responsibilities (July 2025)

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.

Do you work for Communauté d'agglomération de Saint-Quentin-en-Yvelines, or sit on its council? A figure to correct, context to add: write to us.

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