--- title: who already pays for the riachuelo canonical_url: https://ensurance.app/guide/who-already-pays-for-the-riachuelo markdown_url: https://ensurance.app/guide/who-already-pays-for-the-riachuelo.md subtitle: aysa runs the plants and the outfall. the living river is the second layer category: ensurance --- # who already pays for the riachuelo *aysa runs the plants and the outfall. the living river is the second layer* Riachuelo sanitation is a bill with a name on it. If you live along the southern edge of Buenos Aires, the Matanza-Riachuelo is the boundary the neighborhood is built against. Sewage in that river is the injury. Moving it into a collector, a plant, and an outfall is the job. Agua y Saneamientos Argentinos, AySA, already runs that job. The system is in testing. The water in the glass is the Río de la Plata. Intake towers take it, and surface plants treat it. The city depends on that estuary staying treatable. The people in the basin depend on the southern river the city's sewage has used. Same shore, two dependencies. AySA sits on both. ACUMAR holds the mandate for the basin. ## riachuelo sanitation is the bill already on the table AySA is the water and sewer company for the Ciudad Autónoma de Buenos Aires and the partidos inside its concession, read with the AMBA. The Province is a wider map. This account is the concession, and the basin along its southern side. The company's numbers page, in 2023 sustainability figures, puts the concession at 3,363.51 km² and 15,103,199 people. Potable service reaches 11,351,535 of them. Sewer service reaches 9,497,481. Average treated water that year was 6,219,234 m³/day. Sewage treated, across the concession, was 1,720,152 m³/day. Well water is 13% of production. Surface water from the Plata is the main share. Drinking water comes from the Plata through intake towers and three surface plants. AySA names two: General San Martín and Juan Manuel de Rosas. A third plant is implied by the count of three. Its name is not on the page this series uses. The city sits on the western shore of an estuary, a river meeting the sea. The Río de la Plata, the towers that take its water, and the Matanza-Riachuelo along the southern edge are there whether or not anyone holds a certificate. [Ensurance](https://ensurance.app/?from=guide) is how the utility that already runs the tap can fund the living estuary and the living river. The funding is the instrument. The river is the living thing. ## who depends on the same shore The main stem runs 64 km, southwest to northeast, and discharges into the Plata. ACUMAR's characteristics page puts the basin at about 2,047 km² and the population at 4,703,058 people, Census 2022 definitive results. The authority's documentary center still says about 2,200 km² and about 6 million people. This series uses the characteristics figures. Fourteen partidos of the Province sit in the basin, plus parts of the city. If you live there, the river is the boundary and the water the streets drain toward. If you pay an AySA bill anywhere in the concession, the tap depends on the estuary that river enters. The works need the stem to keep functioning as a river while the pipes take the sewage. [What Buenos Aires depends on](/guide/what-buenos-aires-depends-on?from=guide) is the estuary staying treatable. [Who depends on this river](/guide/who-depends-on-the-matanza-riachuelo?from=guide) is the basin's people, the ratepayers on the intakes, and the system that has to put sewage somewhere other than the bank. Costanera Sur, the urban wetland on the estuary shore, is the city's ordinary contact with that water. It is not the sanitation account, and nothing here prices it. A sudestada — southeast wind, often over 35 km/h, with rain — can stack the Plata so the drains cannot empty. The highest remaining flood risk sits over this river, separate from the sewage. [The wind has its own account](/guide/what-a-sudestada-does-to-buenos-aires?from=guide). ## aysa is the one already paying AySA's April 2025 results note puts 2024 service revenue at ARS 907,353 million, up from ARS 519,378 million in 2023. The operating surplus in 2024 was the first since 2007. The same note says the tariff covered ordinary operating costs and maintenance capital spending. The figures stay in pesos, for the whole company. They are not a price on the river. The Ley de Bases declares AySA subject to privatization, and the company began a reorganization. The concession still sits with AySA: plants on the estuary, Riachuelo system on the southern river. That system is the collector, the treatment plant, and the outfall. An August 2025 World Bank paper on program P105680 says the works are in testing, and that the testing already reduces overflows. It does not describe a finished outfall. A World Bank loan is the program behind those works. The partnership below is not a share of that loan, and it is not sized to it. The World Bank has called the tannery sector a major industrial source on this river. The 2025 paper said operation of the industrial plant still required tannery relocation, and that the relocation would take years. The tanneries are a load the basin still carries. The pipes in testing are the sewage job. Moving that industrial load still takes years. ## the court handed execution back Law 26.168 created ACUMAR, the Autoridad de Cuenca Matanza Riachuelo, as the authority of the Nation, the Province, and the City. ACUMAR leads the Plan Integral de Saneamiento Ambiental, PISA. The 2008 Supreme Court judgment in *Mendoza* ordered the cleanup. In October 2024 the Court ended its supervision. In August 2025 it rejected appeals and reaffirmed that close. Execution stays with ACUMAR. The court stepping back changes who watches. The condition of the river is a separate fact. ACUMAR coordinates industrial control, public services, and other activities with an environmental effect in the basin. AySA operates the plants and the system in testing. ACUMAR is the statutory hero of the mandate. This offer does not bill the authority for carrying its own statute. Residents can follow the works in testing and help name the line. That ladder is separate from the offer. The offer, with a buyer and a unit, comes next. :::johnson **aysa already pays for the plants and the outfall.** The living river beside those works is the second layer: one reportable partnership a year, on the concession the company already holds. [see the utilities path →](/solutions/utilities?from=guide&topic=matanza-riachuelo) ::: ## riachuelo wastewater still meets a living river Riachuelo wastewater is the sewage the system is being built to lift out of the Matanza-Riachuelo, through the collector and the outfall, into the estuary the intake towers also drink. In the 2023 figures, sewage treated across the whole concession was 1,720,152 m³/day. That is a concession total, not a meter on the Riachuelo alone. The basin's piece, the Riachuelo system, is still in testing. Overflows the World Bank paper says testing already reduces are a pipe result. The banks and the intake shore are a second result. They need funding as living water, beside the concrete. [The Plata is an estuary, not a tank behind the plant](/guide/the-plata-is-an-estuary-not-a-tap?from=guide). Source protection on the shore the towers stand in, and restoration where overflows have hit the southern river, sit next to the collector. ## one partnership, named The buyer is AySA. The exposure is the service the company already delivers. The solutions are two paths on the utilities page, named as they appear there: **source watershed investment** and **sewer overflow restoration**. The work they fund is the living condition of the intake shore and the Matanza-Riachuelo beside the works already being tested. The unit is one reportable partnership a year on the line `matanza riachuelo`. The unit is that partnership. It is not a dollar figure, and it is not a slice of the World Bank loan. | | | |---|---| | buyer | AySA | | exposure | 11,351,535 people on potable service, and 6,219,234 m³/day treated (2023). Well water is 13% of production, so the Plata plants are the main source. The Riachuelo system is still in testing. | | solution | source watershed investment and sewer overflow restoration | | work it funds | the living condition of the intake shore and the Matanza-Riachuelo, beside the works already being tested | | unit | one reportable partnership a year on the line `matanza riachuelo`, next to the system AySA already operates | | door | [utilities](/solutions/utilities?from=guide&topic=matanza-riachuelo) | Source watershed investment follows the shore the towers drink: funding for that living water, recorded beside the treatment AySA already pays for. Sewer overflow restoration follows the southern river: recovery where overflows have been the injury, beside the pipes in testing. The collector keeps its job. The partnership keeps the living river. If you run the plants, you already operate the intakes, test the Riachuelo system, and book the service in pesos. A partnership a year records the living water those assets depend on, in a unit a report can carry. If you structure capital beside a utility, that is the unit. The buyer in the row stays AySA. [Take it up on the utilities path →](/solutions/utilities?from=guide&topic=matanza-riachuelo) ## the line under the parent outlet The line is `matanza riachuelo`, in ideation under [`parana-river.basin`](/parana-river.basin?from=guide). The Paraná is the parent outlet that feeds this estuary, not the subject of the sanitation job. The parent agent is live. The line is in ideation. It is a line, direct funding on this river, not a policy claiming title over the water. A certificate on `matanza riachuelo` funds the intake shore and the river. The line is in ideation. Co-create it with us; a person reviews it; the parent agent receives. [co-create matanza riachuelo →](/specific/create?mode=suggest&agent=parana-river.basin&name=matanza%20riachuelo&from=guide) The line sits beside the works in testing. It does not replace the collector, and it does not say the water is clean. ACUMAR keeps the mandate. AySA keeps the plants. [Talk to someone who can help →](/contact?from=guide&topic=matanza-riachuelo) ## frequently asked questions ### who pays for riachuelo sanitation? AySA does. It operates the plants and the Riachuelo system, now in testing. Company service revenue in 2024 was ARS 907,353 million, left here in pesos. ACUMAR holds the mandate under Law 26.168 and PISA. The offer does not bill the authority for the statute. ### where does riachuelo wastewater go while the works are in testing? Into the collector, the treatment plant, and the outfall. An August 2025 World Bank paper says those works are in testing and that testing already reduces overflows. The system is unfinished. Beside that flow, sewer overflow restoration and source watershed investment fund the living river and the intake shore. ### did the court's step back mean the river recovered? In October 2024 the Supreme Court ended supervision of *Mendoza*. In August 2025 it rejected appeals and reaffirmed that close. Execution stays with ACUMAR. The water, and the works still in testing, did not change with the close. ### what does one partnership a year buy? One reportable partnership a year on `matanza riachuelo`, for source watershed investment and sewer overflow restoration. It funds the living intake shore and the river beside works AySA already operates. The exposure is 11,351,535 people on potable service and 6,219,234 m³/day treated in 2023. The unit is the partnership, not a dollar conversion and not a share of the World Bank loan. ### how does someone beside the utility take part? Residents co-create the same line, in ideation. A person reviews it, and [`parana-river.basin`](/parana-river.basin?from=guide) receives it. The offer row, with the unit, stays AySA. [suggest the line →](/specific/create?mode=suggest&agent=parana-river.basin&name=matanza%20riachuelo&from=guide) ## from the southern edge If you have stood where the city meets this river, you already know which water is the boundary and which water is the glass. The estuary and the Matanza-Riachuelo go on either way. AySA is already paying for the plants and the system in testing. The second layer is the living condition beside those works, one partnership a year, on a line you can [co-create](/specific/create?mode=suggest&agent=parana-river.basin&name=matanza%20riachuelo&from=guide) or [carry as the utility](/solutions/utilities?from=guide&topic=matanza-riachuelo). [talk to someone who can help →](/contact?from=guide&topic=matanza-riachuelo) ## sources [AySA results note, April 2025](https://www.aysa.com.ar/usuarios/Novedades/2025/04/resultados_superavit_operativo) — 2024 service revenue of ARS 907,353 million, up from ARS 519,378 million in 2023; the operating surplus was the first since 2007; the tariff covered ordinary operating costs and maintenance capital spending; the Ley de Bases declares the company subject to privatization, and a reorganization had begun. [AySA, Nuestros números](https://www.aysa.com.ar/Quienes-Somos/nuestros-numeros) — 2023 sustainability figures: concession 3,363.51 km²; 15,103,199 people in the concession area; 11,351,535 on potable service; 9,497,481 on sewer service; average treated water 6,219,234 m³/day; sewage treated 1,720,152 m³/day; well water 13% of production. Named surface plants: General San Martín and Juan Manuel de Rosas. A third plant is counted and not named here. [World Bank paper, August 2025, P105680](https://documents1.worldbank.org/curated/en/099082025172028148/pdf/P105680-60a8b946-e924-4105-8690-a2f3d85c639a.pdf) — the Riachuelo works in testing, with overflows the paper says testing already reduces; tannery relocation still required before the industrial plant can fully operate, and expected to take years. The loan is the program for those works. It is not the unit of the partnership. [Infobae, 14 August 2025](https://www.infobae.com/judiciales/2025/08/14/la-corte-ratifico-el-cierre-de-la-causa-riachuelo-y-dio-por-concluida-su-supervision-del-saneamiento/) — the Supreme Court rejected appeals and reaffirmed the close of its supervision in the Mendoza case. Used only for that close. [ACUMAR, características de la cuenca](https://www.acumar.gob.ar/institucional/que-es-acumar/caracteristicas-de-la-cuenca2/) — main stem 64 km, basin about 2,047 km², 4,703,058 people on the Census 2022 definitive results. [ACUMAR documentary center, La Cuenca](https://centrodocumental.acumar.gob.ar/la-cuenca) — older lines, about 2,200 km² and about 6 million people, still sit on this page. The characteristics figures are the ones used above. [ACUMAR on the Mendoza case](https://www.acumar.gob.ar/institucional/causa-mendoza/) — the authority's page on the case whose supervision the Court ended in October 2024. ## the series - [what the city depends on](/guide/what-buenos-aires-depends-on?from=guide) - [who depends on the matanza-riachuelo](/guide/who-depends-on-the-matanza-riachuelo?from=guide) - [the plata is an estuary, not a tap](/guide/the-plata-is-an-estuary-not-a-tap?from=guide) - [a sudestada stacks the plata against the drains](/guide/what-a-sudestada-does-to-buenos-aires?from=guide) - [who already pays for the riachuelo](/guide/who-already-pays-for-the-riachuelo?from=guide)