SIAHVY - Syndicat de l'Yvette

What SIAHVY - Syndicat de l'Yvette does

SIAHVY (Syndicat Intercommunal pour l'Aménagement Hydraulique de la Vallée de l'Yvette) is a French public intercommunal syndicate — an Établissement public de coopération intercommunale — founded in 1946 and headquartered in Saulx-les-Chartreux, Essonne, south of Paris. The organization aggregates approximately 30 member communes in the Yvette river basin and operates as the delegated public authority for integrated water governance on that territory.

Its service portfolio spans three functional pillars: (1) aquatic environment management, covering hydromorphological restoration, ecological continuity, wetland preservation, and watercourse maintenance; (2) flood risk management, including hydraulic infrastructure operations, an early-warning system with real-time water-level bulletins, and a Téléalerte subscription service; and (3) sanitation services, comprising wastewater collection and transport, treatment via Membrane Bio-Reactor (BRM/MBR) stations, individual septic system inspection (SPANC), and stormwater regulation. Underlying technology combines conventional activated-sludge biology with membrane filtration for effluent polishing, supplemented by telemetry and remote-monitoring (télégestion/télésurveillance) systems distributed across geographically isolated installations. The syndicate also runs a public-education program ('Classes d'eau') and publishes an annual magazine ('Mag de l'Yvette') and activity reports.

Revenue is not commercial in the venture sense: funding flows from member commune contributions, Agence de l'eau subsidies, and sanitation service fees, channeled through the French public-sector framework governed by the SDAGE Seine-Normandy and, prospectively, the SAGE Orge-Yvette planning instruments. The contracting counterparties for downstream and adjacent basin coordination are SIAAP (Greater Paris sanitation) and SIVOA (Orge Aval valley). Strategic activity through 2026 — including signature of the Contrat de Territoire Eau & Climat 2026-2030 — positions SIAHVY primarily as a climate-adaptation and infrastructure-renewal actor rather than a growth-equity investment target.

Name

SIAHVY - Syndicat de l'Yvette

Legal name

Syndicat Intercommunal pour l'Aménagement Hydraulique de la Vallée de l'Yvette

Website

https://siahvy.org

Company type

Private

Founded year

1946

Operating status

Operating

Headcount range

11–50 employees

Short description

SIAHVY is a French public intercommunal syndicate founded in 1946 that manages the Yvette river basin for approximately 30 communes, handling river restoration, flood prevention, and wastewater treatment via Membrane Bio-Reactors.

Ownership category

akta.pro rank

Product category

Public Water Management

NAICS

Sewage Treatment Facilities (22132), Water Supply and Irrigation Systems (221310), Administration of Air and Water Resource and Solid Waste Management Programs (92411), Administration of Environmental Quality Programs (9241)

SIC

Sanitary Services (4950), Water Supply (4941), Electric, Gas & Sanitary Services (4900)

akta.pro primary industry

Water Resources Administration (Watersheds, Rivers, Groundwater) (BPAIAMAE)

akta.pro secondary industries

Water Resources, WASH & Integrated Water Management (BPADALAH), Advanced/Nutrient Removal (BNR/ENR: N, P) (EUANADAC), Biodiversity Net Gain (BNG) / No Net Loss Planning & Metrics (EUAHAHAJ), NRW Data Management & Water Balance (IWA Methodology, GIS/SCADA Integration, Digital Twins) (EUANAKAJ)

Keywords

• Water management services
• Flood risk management
• Wastewater treatment
• River restoration
• Public sanitation

Headquarters

HQ city

Saulx-les-Chartreux

HQ country

France

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Infrastructure, Others

Revenue model

1. Public funding and intercommunal contributions: As a French public intercommunal syndicate, SIAHVY is funded through contributions from member communes, water agency subsidies, and service fees related to sanitation and water management services.

Distribution channels1 record

Marketing channels6 records

Core offering

SIAHVY is a French public intercommunal syndicate that provides integrated water management services across the Yvette river basin in the Essonne department. Its core activities include hydromorphological restoration of aquatic environments, ecological continuity works, wetland preservation, watercourse maintenance, flood risk management with early warning systems, wastewater collection and transport, treatment via wastewater treatment plants, non-collective sanitation inspection (SPANC), and stormwater management — funded by member commune contributions and public water agency subsidies.

Product overview

SIAHVY (Syndicat Intercommunal pour l'Aménagement Hydraulique de la Vallée de l'Yvette) is a public intercommunal syndicate providing integrated water management services across the Yvette valley in France. The organization operates a multi-service portfolio organized around three core pillars: (1) Aquatic Environment Management encompassing river restoration, ecological continuity, wetland preservation, and watercourse maintenance; (2) Flood Risk Management including infrastructure operation, early warning systems, and vulnerability reduction programs; and (3) Sanitation Services covering wastewater collection, transport, treatment, and stormwater management. Additionally, the syndicate delivers public education programs including 'Classes d'eau' for school children, publishes informational magazines and annual reports, and maintains recreational trails along the river. The organization serves approximately 30 municipalities managing river ecosystems, sewer infrastructure, and flood prevention across the Yvette watershed.

Differentiator

Problem solved

Functional benefit

Products and services

• Restauration des milieux aquatiques (River and hydromorphological restoration) Restoration and hydromorphological improvement of aquatic environments and wetland areas in the Yvette valley, delivered as a public service to member communes.
• Rétablissement de la continuité écologique (Ecological continuity restoration) Works to allow fish and sediment migration along the Yvette by addressing hydraulic barriers and restoring ecological continuity across the watershed.
• Préservation des zones humides (Wetland preservation) Protection and management of wetland areas to maintain biodiversity and natural water filtration functions in the Yvette valley.
• Entretien des cours d'eau (Watercourse maintenance) Maintenance and monitoring of watercourses including vegetation management, sediment removal, and infrastructure upkeep for the Yvette and its tributaries.
• Gestion des inondations (Flood risk management) Flood risk management including operation of retention infrastructure, early warning systems, vulnerability reduction programs, and emergency response coordination for the Yvette basin.
• Collecte et transport des eaux usées (Wastewater collection and transport) Collection and transport of domestic and industrial wastewater through sewer networks to treatment facilities for member communes.
• Exploitation et entretien des réseaux (Network operation and maintenance) Operation and maintenance of sewer networks to ensure proper functioning and prevent environmental contamination within the Yvette territory.
• Assainissement non collectif (SPANC) Inspection and certification of individual household sewage disposal systems (fosse septique) for properties not connected to the public sewer network in member communes.
• Traitement des eaux usées (Wastewater treatment plants) Operation of wastewater treatment plants (stations d'épuration) using Membrane Bio-Reactors (BRM), processing wastewater before release into natural water bodies and ensuring compliance with environmental standards.
• Gestion des eaux pluviales (Stormwater management) Regulation and management of stormwater runoff from agricultural and urban areas to prevent flooding and pollution in the Yvette territory.
• Classes d'eau (Water education program) Educational program for school children teaching water cycles, aquatic environments, and water conservation through hands-on activities and site visits in the Yvette valley.
• Flood bulletins and water level monitoring (Hauteurs d'eau et bulletins crue) Real-time water level monitoring and flood alert bulletins providing current heights and forecasts for the Yvette river, accessible via the syndicate website.
• Balades au bord de l'eau (Heritage walking trails) Hiking trails and nature walks along the Yvette river featuring information about local heritage, landscapes, fauna, and flora.
• Mag de l'Yvette (Annual magazine) Annual magazine featuring the syndicate's activities, projects, key figures, and environmental initiatives in the Yvette valley.
• Rapports d'activité (Annual activity reports) Annual activity reports documenting the syndicate's projects, achievements, and financial information, available on the publications page.

Named customers1 record

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Partnerships

Four partnerships are on record, tiered major and core.

• SIAAP (Syndicat Interdépartemental pour l'Assainissement de l'Agglomération Parisienne)majorStrategic or Co-development PartnerSIAAP is the downstream sanitation syndicate managing wastewater treatment for the Greater Paris area, receiving flows from the SIAHVY territory. It operates major treatment plants including Seine Amont (Valenton) and Seine Aval (Achères). SIAHVY works in coordination with SIAAP for downstream sanitation infrastructure management.
• SIVOA (Syndicat Intercommunal de la Vallée de l'Orge Aval)majorStrategic or Co-development PartnerSIVOA is the intercommunal syndicate immediately downstream of the SIAHVY territory, managing the Orge Aval valley. SIAHVY coordinates with SIVOA for integrated basin management as the Yvette is a tributary of the Orge.
• Agence de l'eau (Water Agency)coreStrategic or Co-development PartnerThe Agence de l'eau is a French public state agency responsible for preserving water resources, combating pollution, and restoring aquatic environments. It collects levies from all water users and redistributes funding to finance water management actions, projects, and works. The agency operates under a pluriannual program and SIAHVY's activities are aligned with its objectives.
• SDAGE Seine NormandiecoreOthersThe Schéma Directeur d'Aménagement et de Gestion des Eaux (SDAGE) for the Seine-Normandy basin sets fundamental guidelines for balanced water resource management. The Yvette valley falls under the SDAGE Seine Normandie territory, and SIAHVY's activities must be compatible with its orientations.

Scale indicators2 records

Recent moves6 records

Expansion highlights4 records

Direct peers

• SIAAP (Syndicat Interdépartemental pour l'Assainissement de l'Agglomération Parisienne): Downstream intercommunal sanitation syndicate for the Greater Paris area. Same French public syndicate model, same sanitation/wastewater mandate, and an active operational partner of SIAHVY.
• SIVOA (Syndicat Intercommunal de la Vallée de l'Orge Aval): Neighboring intercommunal syndicate managing the Orge Aval valley immediately downstream of SIAHVY. Shares the same institutional model, river basin management scope, and tributary relationship with the Yvette.

Others

• Agence de l'eau Seine-Normandie: French state water agency that funds and coordinates water management programs in the Seine-Normandy basin. Functions as a primary funder and regulatory counterparty to SIAHVY rather than a direct service competitor.

Broad incumbents

• SEDIF (Syndicat des Eaux d'Île-de-France): Large public water utility syndicate serving much of Île-de-France. Operates the same delegated public syndicate model at significantly larger scale for potable water distribution.
• Veolia Eau France: Largest private water and wastewater services operator in France. Provides delegated public service management for many communes, including sanitation services that overlap with SIAHVY's scope in adjacent territories.
• Suez Eau France: Major private operator of water and wastewater services under French public service délégégation contracts. Comparable service offering to SIAHVY but delivered via private concession model.
• EPTB Seine Grands Lacs: Public basin authority managing large reservoirs and flood prevention works across the Seine basin. Operates upstream of SIAHVY's territory within the same institutional framework for water resource administration.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/siahvy
• YouTubeyoutube.com/channel/UCOqUwehuWRWK8coDsxp3-Gw
• Facebookfacebook.com/siahvy
• LinkedInlinkedin.com/company/siahvy-syndicat-de-l-yvette
• Instagraminstagram.com/syndicatdelyvette

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about SIAHVY - Syndicat de l'Yvette