In Septeuil, the council took a second round
Julien Riviere has been mayor of Septeuil since March 30, 2026, elected by the 19 members of the municipal council. At the March 2026 municipal elections, SEPTEUIL 2026 won 14 of the 19 seats in the second round on March 22, 2026, with 45.8% of the votes. Septeuil is part of the Communauté de communes du Pays Houdanais (CCPH).
March 2032
Councils are elected for six years; the council elects the mayor.
Register to vote ↗Throughout this page, the median in Yvelines and the France median are the median of compared communes (those with an overall grade), each figure its own median. Septeuil has 2,264 residents; every compared commune has 2,507 or more, so read its place among them with that in mind.
What stands out about Septeuil’s town hall
Decided in a second round
No list won half the votes in the first round, when 3 lists stood. In the second round on March 22, 2026, SEPTEUIL 2026 came first with 45.8% and took 14 of the 19 seats; the other lists share the remaining 5. Who’s in charge ↓
Turnout above most communes
63.5% of registered voters in Septeuil voted on March 15, 2026: higher than in 79% of compared French communes. The median of compared communes in Yvelines was 56.2%; across France, 57.4%. 2026 elections ↓
Less debt per resident than most
Septeuil owed €1.3M at the end of 2025, €566 per resident: lower than in 66% of compared French communes (France median €748). That equals 80% of a year’s running costs. The commune’s money ↓
Little investment
Septeuil invested €256 per resident (buildings, roads, equipment), 27% of its spending: lower than in 76% of compared French communes (France median €403). Investment swings from year to year with projects. The commune’s money ↓
Results as the Interior ministry published them; accounts from the DGFiP via OFGL. Nothing here is graded.
The council the voters chose
Seats as the March 2026 results gave them, one dot a seat.
- SEPTEUIL 2026143 community seats
- SEPTEUIL, UN NOUVEAU SOUFFLE41 community seat
- SEPTEUIL, C'EST VOUS !10 community seats
As elected in the second round, March 22, 2026.
The list that comes first gets half the seats; the rest are shared in proportion among the lists with 5% or more, the winner included. So the winning list always has a majority. The same vote gave Septeuil 4 seats on the council of the Communauté de communes du Pays Houdanais (CCPH) (community seats).
Source: Interior ministry, 2026 municipal election results (March 15 and 22), subject to corrections and appeals.
4 authorities share the work
The commune is the tier closest to residents; the intercommunality, the département and the région do the rest.
Births, marriages and deaths, the electoral roll, nursery and primary schools, local roads, planning permission, the municipal police, and what else the council takes on.
Mayor: Julien Riviere · 19 councilors
The services its communes share: usually waste collection, economic development and planning documents; often water and local buses.
Social aid (RSA, care for older and disabled people, child protection), collèges, the département’s roads, and funding for fire and rescue.
Lycées, regional trains (TER) and coaches, economic development and job training.
Who to ask
The usual split of powers (service-public.fr); an intercommunality’s exact remit varies, so check its website for waste, water and buses.
Membership: COG 2026 (INSEE); intercommunality type: BANATIC, January 2025. What each tier does: service-public.fr.
From the mayor to the intercommunality
The officials as the Interior ministry’s register lists them, and the council by list.
- 1Mayorsince March 30, 2026Julien Riviere
- 2Deputy mayors4 adjoints, elected by the councilSophie LemaireMichel RousselotStephanie ChampionFranck Rousseau
- 3Septeuil municipal council19 seats by listSEPTEUIL 2026 14 · SEPTEUIL, UN NOUVEAU SOUFFLE 4 · SEPTEUIL, C'EST VOUS ! 1
- 4Communauté de communes du Pays Houdanais (CCPH)Septeuil holds 4 seatsCommunity councilors are drawn from the council lists in the same vote.
Source: Interior ministry, national register of elected officials (RNE), August 11, 2026.
The 19 members of the Septeuil municipal council
The mayor and 4 deputy mayors first, then the councilors.
| Name | Office | Since |
|---|---|---|
| Julien Riviere | Maire | March 30, 2026 |
| Sophie Lemaire | 1er adjoint au Maire | March 30, 2026 |
| Michel Rousselot | 2ème adjoint au Maire | March 30, 2026 |
| Stephanie Champion | 3ème adjoint au Maire | March 30, 2026 |
| Franck Rousseau | 4ème adjoint au Maire | March 30, 2026 |
Show the full council (19)
| Name | Office | Since |
|---|---|---|
| Julien Riviere | Maire | March 30, 2026 |
| Sophie Lemaire | 1er adjoint au Maire | March 30, 2026 |
| Michel Rousselot | 2ème adjoint au Maire | March 30, 2026 |
| Stephanie Champion | 3ème adjoint au Maire | March 30, 2026 |
| Franck Rousseau | 4ème adjoint au Maire | March 30, 2026 |
| Christophe Bourdon | Conseiller municipal | March 22, 2026 |
| Pascal Broussot | Conseiller municipal | March 22, 2026 |
| Nathalie Cayez | Conseiller municipal | March 22, 2026 |
| Bruno Chidlovsky | Conseiller municipal | March 22, 2026 |
| Corinne Ciboire | Conseiller municipal | March 22, 2026 |
| Laurent Debuire | Conseiller municipal | March 22, 2026 |
| Christopher Lemaire | Conseiller municipal | March 22, 2026 |
| Ingrid Mulleman | Conseiller municipal | March 22, 2026 |
| Cendrine Nicolas | Conseiller municipal | March 22, 2026 |
| Liliane Pellerin | Conseiller municipal | March 22, 2026 |
| Dominique Riviere | Conseiller municipal | March 22, 2026 |
| Christine Rodrigues | Conseiller municipal | March 22, 2026 |
| Valérie Salmon | Conseiller municipal | March 22, 2026 |
| Isabelle Thiebault | Conseiller municipal | March 22, 2026 |
Names and offices as the Interior ministry’s national register of elected officials (RNE) published them on August 11, 2026, written as it writes them. Public role only. Later resignations and replacements aren’t shown.
The council: same source as Who represents Septeuil, above.
How Septeuil voted in March 2026
3 lists stood in the first round; none won half the votes, so a second round followed.
1,108 votes cast for a list
1,119 of 1,616 registered voters in Septeuil voted.
9 blank and 2 spoilt ballots, not counted in the shares.
1,010 votes cast for a list · no seats given out: a second round followed
1,026 of 1,616 registered voters in Septeuil voted.
12 blank and 4 spoilt ballots, not counted in the shares.
Turnout, first round · March 15, 2026
Shares are of the votes cast for a list, leaving out blank and spoilt ballots. Lists in vote order; the colors only tell the lists apart.
2026 elections: same source as Who’s in charge, above.
Septeuil spends €964 per resident a year
The commune’s consolidated accounts: main and annexed budgets, transfers between them removed.
Per resident, 2025 · against compared communes
Spending and debt per resident, 2018 to 2025
Septeuil owed €1.3M at the end of 2025, €566 per resident, lower than in 66% of compared French communes, equal to 80% of a year’s running costs.
Show year by year
| Year | Spending | Investment | Debt | Debt in all |
|---|---|---|---|---|
| 2025 | €964 | €256 | €566 | €1.3M |
| 2024 | €813 | €153 | €621 | €1.4M |
| 2023 | €944 | €281 | €674 | €1.6M |
| 2022 | €719 | €102 | €729 | €1.7M |
| 2021 | €723 | €122 | €801 | €1.9M |
| 2020 | €729 | €153 | €959 | €2.3M |
| 2019 | €1,152 | €572 | €1,258 | €3M |
| 2018 | €992 | €378 | €1,337 | €3.2M |
Source: OFGL, consolidated commune accounts 2018–2025 (DGFiP); 2025 provisional.
The 21st highest debt per resident of 41 communes its size
The 40 compared communes nearest in population, debt per resident at the end of 2025.
Lowest: Watten, €1. Highest: Mers-les-Bains, €3,228.
Have a say in Septeuil
French citizens register online or at the town hall; citizens of other EU countries can vote in municipal elections too.
service-public.fr ↗See where you’re registered and which polling station is yours.
service-public.fr ↗Council meetings are public; the agenda and minutes are posted at the town hall and usually on its website.
service-public.fr ↗Opening hours, address and phone number of the mairie of Septeuil in the public services directory.
lannuaire.service-public.fr ↗Who can stand, how lists are formed and the deadlines, from the Interior ministry.
interieur.gouv.fr ↗What this data can and can’t tell you
- Mayors and councilors. From the Interior ministry’s national register of elected officials (RNE) as published on August 11, 2026: name, office and start dates, nothing else. The register counts a mayor as a councilor too; the page counts each person once. It isn’t a live roll: resignations and replacements after that date aren’t shown, and no party is inferred for any official.
- How the council is elected. Since March 2026 every commune elects its council from lists (a 2025 law extended list voting to communes under 1,000). A list with more than half the votes in the first round wins; otherwise lists with 10% or more can go on to a second round, where the list ahead wins. It gets half the seats, and the rest are shared in proportion among lists with 5% or more. The council then elects the mayor and the deputy mayors.
- The label beside a list. The political nuance the prefecture gave the list for the ministry’s results (Divers droite, Union de la gauche…), shown as published. It isn’t the list’s own description; many lists, most in small communes, have none.
- The commune’s money. OFGL’s consolidated accounts from the DGFiP, 2018 to 2025; 2025 is provisional. Spending and investment leave out loan repayments; running costs are part of spending. Debt is what was owed at the end of the year.
- Per resident. Divided by the DGFiP’s population for that year (population totale, which counts some people, such as boarding students, in two communes), so it can differ from the census figure elsewhere on the site.
- The medians. Beside the town’s figure, the median of compared communes in its département and in France (those with an overall grade). A commune’s spending follows its size and its role: one that runs a pool or a theater for the villages around it spends more per resident.
Questions about Septeuil’s town hall
Who is the mayor of Septeuil?
Julien Riviere, mayor since March 30, 2026, according to the Interior ministry’s register of elected officials (August 11, 2026).
How many councilors does Septeuil have?
The Septeuil municipal council has 19 members, the mayor and 4 deputy mayors included.
Who won the 2026 municipal elections in Septeuil?
SEPTEUIL 2026, in the second round on March 22, 2026, with 45.8% of the votes; it holds 14 of the 19 seats.
What was the turnout in Septeuil?
63.5% of registered voters voted in the first round on March 15, 2026; the median of compared French communes was 57.4%.
When are the next municipal elections in Septeuil?
Councils are elected for six years, so the next general municipal elections are due in March 2032. A council can be re-elected sooner if it loses too many members.
How much debt does Septeuil have?
€1.3M at the end of 2025, €566 per resident; the median of compared French communes was €748.
Which intercommunality is Septeuil part of?
Septeuil is part of the Communauté de communes du Pays Houdanais (CCPH), which runs the services its communes share.
Sources: Interior ministry RNE, August 11, 2026 · Interior ministry, municipal results 2026 · OFGL consolidated commune accounts 2018–2025 · INSEE COG 2026 and BANATIC (January 2025) for the intercommunality. Under the Licence Ouverte / Open Licence 2.0 (Etalab).
Contains public sector information under the Licence Ouverte / Open Licence 2.0 (Etalab): INSEE, DGFiP, the Interior Ministry’s statistics service (SSMSI), the Ministry of Education (DEPP), the Health Ministry’s statistics service (DREES) and the Housing Ministry (Carte des loyers). Commune boundaries: IGN Admin Express.