Águas das Agulhas Negras

Águas das Agulhas Negras was commissioned to take care of sanitation services in Resende, state of Rio de Janeiro, on January 1, 2008.

At that time, only 3% of the population had their wastewater treated and 96% of the population was served with piped water.

Today, 100% of the local people have access to treated water, and 62% of the wastewater is treated.

To date, seven water treatment plants are in operation. Taken together, they treat about 31 million liters per day. Seven wastewater treatment plants process 19 million liters per day. The goal is to universalize wastewater treatment in the coming years.

Over 30 years of concession, the company plans to invest more than BRL 136 million in the city, and BRL 60 million of these were pledged in the first years. By 2019, Resende is expected to have 90% of its wastewater treated. Águas das Agulhas Negras plans to build new treatment plants and another 30 km in new and replaced water and wastewater pipelines.

  • Concession date: 01/01/2008
  • City: Resende (Rio de Janeiro)
  • Population: 119,900 inhabitants
  • Water treatment plants: 7
  • Water connections: 35,824
  • Number of units with water connection: 50,855
  • Wastewater Treatment Plants: 8
  • Sewer connections: 34,172
  • Number of units with sewage connection: 48,568


In January 2008, the utility company Águas das Agulhas Negras (CAAN) was granted concession to operate the sanitation services in Resende, prioritizing, among other activities, the treatment of wastewater, which, hitherto, was covering as little as 3% of the volume generated. In July, the company started up the Alegria Wastewater Treatment Plant (WWTP) after an effort of renovation and improvements to the unit, raising the treatment rate to 45%.

Months later, Águas das Agulhas Negras restarted operations at the then shutdown Isaac Politi WWTP. With the two treatment plants in operation, the city reached the mark of 54% of treated wastewater, becoming the Vale do Paraíba Fluminense town that most treats its wastewater.

The works done in 2008 include the implementation of the Service Management Module (MGS) system for the management of water and wastewater services; simultaneous printing of bills; the Operational Control Center operating on a 24 x 7 basis; the setup of a water and wastewater quality test laboratory; opening of a new customer service center in the city center; and the 115 Hotline and an Ombudsman Office.


Águas das Agulhas Negras expanded and renovated the Engenheiro Passos Water Treatment Plant, increasing its treatment capacity to 30 liters per second. During this period, the company designed the Main Water Treatment Plant project. With one module, this WTP can treat 200 liters per second, but it can be expanded to 400 liters per second if it is fitted with two modules. The project was based on all technical and environmental standards applicable to make it one of the most modern plants in the state of Rio de Janeiro.

Cleaning of the Mirante das Agulhas Lake, the Bairro Morada da Barra Lagoon and the swamp that separates the Elite and Vila Santa Isabel suburbs were three major social and environmental achievements of Águas das Agulhas Negras in 2009. Besides, it devised the Local Sanitation Services Plan, continued the renovations of all water treatment plants, expansion and replacement of water and sewage pipelines and repair of pumping stations.


Águas das Agulhas Negras celebrates the local population’s 90% approval of the services provided. This rate results from a study conducted by Instituto Gerp. Over the year, the company invested in the renovation and expansion of the Monet WWTP and the Fazenda da Barra WTP, in addition to dozens of kilometers of both new and replaced water and sewage pipelines in many suburbs.


In 2011, investments rose. Águas das Agulhas Negras started to treat wastewater from the suburbs Parque Embaixador, Campo Belo and Fazenda da Barra II through a collaboration with Servatis, which receives the wastewater and treats at its station.

Wastewater treatment levels rose to 60%, maintaining Resende at the top of the list of cities that treat wastewater in southern Rio de Janeiro, meeting the targets established in the Call for Tender before than expected.


To better accommodate the clients and assist them in a comfortable area, the company renovated its customer service center located in the city center. It also continued the project of replacing and installing water and wastewater pipelines in a range of suburbs and implemented a waste control program, where a team conducts tests at night time looking for hidden leaks.

In June, it completed the construction works along the promenade and delivered a fully developed facility to the town. The Alegria Water Treatment Plant was also put into operation. Considered the town’s main treatment plant, the unit was designed to treat 200 liters of water per second to ensure self-sufficiency in treated water for the decades to come.

While the plant was under construction, Águas das Agulhas Negras implemented a 4,100-meter treated water main. The pipeline will allow the water produced to be transported to the 3-million-liter reservoir in the Liberdade suburb.


In 2013, the laboratory was renovated and received new equipment to get it accredited with INEA — State Environmental Institute. The company continued the expansion and replacement of water and wastewater pipelines and pumping stations.


Águas das Agulhas Negras got its laboratory accredited with the State Environmental Institute (INEA).

In the same year, the company began works to implement the Wastewater Treatment Plants, pipelines and pumping stations in the São Caetano suburb.



The São Caetano Wastewater Treatment Plant is put into operation, benefiting roughly 2,000 people, raising the rate of treated wastewater to 62%. Late in 2015, expansion and modernization works at the AMAN Wastewater Treatment Plant were completed. As the wastewater piping system of the neighboring suburbs has been completed, wastewater treatment in the city is expected to get to 70% by the end of 2016.



Águas das Agulhas Negras starts up the AMAN WWTP, expanded to serve 27,000 inhabitants with wastewater treatment. In addition to the plant, the company complemented the wastewater system with 9 additional kilometers of sewer pipelines, pressurized lines and 12 pumping stations. With these investments, Resende achieves one of the highest percentages of wastewater treatment in the state of Rio de Janeiro.



The Engenheiro Passos WWTP started to be built. It will serve about 3.500 inhabitants with treated wastewater, helping to clean up the Água Branca river. The project includes 2,200 meters of sewer pipelines and the sewage treatment rates will be raised to 72%.

The utility Águas das Agulhas Negras supplies the city of Resende with treated water, following the highest quality standards.  The water treatment plants (WTPs) have a maximum treatment capacity of 760 l/s and treat 430 l/s on average.

Learn more about our WTPs below:

31 de Março WTP

  • Located in: Morro do Querozene
  • Treatment Capacity: 60 l/s
  • Population served: 14,000 people
  • Suburbs served: Vicentina and Vicentina 2, Alto dos Passos, Santo Amaro, Vila Adelaide, Campos Elíseos, Morro do Batista, Morro do Querosene, Lavapés, Agulhas Negras, Comercial, Jardim Tropical, Vila Verde, Alto dos Passos, Vila Moderna, Santo Amaro, Parque Castro Silva and Surubi Velho.
  • Treatment Type: Conventional Treatment
  • Water catchment: Cruz das Almas Creek

Alegria WTP

  • Located in: Itapuca
  • Treatment Capacity: 300 l/s
  • Population served: 58,000 people
  • Suburbs served: Cidade Alegria, Alegria 1 and 2, Alegria Velha, Baixada Olaria, Elite, Limeira Tow House, Elite, Itapuca, Morada da Colina, Mutirão, Residencial Limeira, Paraíso, Lavapés, Alto dos Passos, Santo Amaro, Vila Moderna, Vila Adelaide, Jardim Brasília 1 and 2, Parque Ipiranga, Alambari, Monet, Morada do Castelo, Montese, Vila Central, Vila Santa Isabel, Vila Julieta, Vila Santa Cecília, Barbosa Lima, Centro Antigo, Alvorada, Vila Hulda, Morada do Castelo, Morro do Cruzeiro, Castelo Branco 1 and 2, Cabral, Vila Verde, Surubi Novo, Morada da Felicidade, Liberdade, Manejo, Jardim Jalisco, Vila Elizabete, Jardim Brasilia, Parque Ipiranga, Reservatório Macuco, Santo Amaro, Vila Adelaide, Vila Moderna, Monet, Vila Adelaide and Ipiranga.
  • Treatment Type: Conventional Treatment
  • Water catchment: Paraíba do Sul River

Engenheiro Passos WTP

  • Located in: Engenheiro Passos
  • Treatment Capacity: 30 l/s
  • Population served: 4,000 people
  • Suburbs served: Centro, Novo Bairro, Vila Aramagi and Vila Bela Vista
  • Treatment Type: Conventional Treatment
  • Water catchment: Água Branca Creek

Fazenda da Barra WTP

  • Located in: Fazenda da Barra II
  • Treatment Capacity: 55 l/s
  • Population served: 10,000 people
  • Suburbs served: Parque Embaixador, Parque Minas Gerais, Fazenda da Barra I, II and III, Morada da Barra, Maria Cândida, Jardim do Sol, Jardim Esperança and Campo Belo
  • Treatment Type: Conventional Treatment
  • Water catchment: Pirapetinga River

Nova Liberdade WTP

  • Located in: Nova Liberdade
  • Treatment Capacity: 200 l/s
  • Population served: 7,000 people
  • Suburbs served: Paraíso, Lavapés, Alto dos Passos, Santo Amaro, Vila Moderna Vila Adelaide, Jardim Brasília 1 and 2, Ipiranga, Alambari, Monet, Morada do Castelo, Montese, Vila Central, Vila Santa Isabel, Vila Julieta, Liberdade, Vila Santa Cecília, Barbosa Lima, Centro Antigo, Jardim Jalisco, Manejo, Alvorada, Vila Hulda, Morada da Felicidade e Vila Elizabete, Cabral, Morro do Cruzeiro and Castelo Branco 1 and 2
  • Treatment Type: Conventional Treatment
  • Water catchment: Paraíba do Sul River

São Caetano WTP

  • Located in: São Caetano
  • Treatment Capacity: 15 liters of water per second
  • Population served: 1,700 people
  • Suburbs served: São Caetano I and II
  • Treatment Type: Conventional Treatment
  •  Water catchment: Paraíba do Sul River

Toyota WTP

  • Located in: Toyota
  • Treatment Capacity:  100 l/s
  • Population served: 23,000 people
  • Suburbs served: Morada da Montanha, Morada do Bosque, Morada das Agulhas, Mirante das Agulhas, Mirante da Serra, Boa Vista I and II, Jardim Oeste, Casa da Lua, Jardim Aliança, Morada do Contorno, Nova Resende, Vila Isabel, Toyota I and II, Jardim Alegria, Nova Alegria, Jardim Primavera I, II and III, Jardim Beira Rio and Condomínio Santo André
  • Treatment Type: Conventional Treatment
  • Water catchment: Paraíba do Sul River

The utility Águas das Agulhas Negras, through eight wastewater treatment stations, treats 62% of the wastewater generated in the city of Resende, with 141 l/s capacity, treating about 120 l/s.


Alegria WWTP

— Located in: Alegria
Treatment Capacity: 100 liters of wastewater per second
– Population served: 55,000 inhabitants
– Suburbs served: Alegria 1 and 2, Alegria Velha, Cidade Alegria, Nova Alegria, Boa Vista 1 and 2, Itapuca, Morada da Colina 1 and 2, Mirante das Agulhas 1, 2 and 3, Baixada Olaria and Santa Isabel
– Treatment Type: UASB + Submerged Aerated Biofilter + Secondary Settler


Isaac Politi WWTP

— Located in: Fazenda da Barra I
Treatment Capacity: 5 liters of wastewater per second
– Population served: 3,000 inhabitants
– Suburbs served:  Jardim do Sol and Jardim Esperança.
– Treatment Type: Anaerobic Lagoon + Facultative Lagoon

Contorno WWTP

— Located in: Morada do Contorno
Treatment Capacity: 10 liters of wastewater per second
– Population served: 7,000 inhabitants
– Suburbs served:  Morada do Contorno, Contorno, Jardim Aliança I and II, Morada da Montanha, Jardim do Oeste, Jardim Primavera and Toyota
– Type of treatment: Batch-activated sludge

Monet WWTP

— Located in: Monet
Treatment Capacity: 9 liters of wastewater per second
– Population served:  2,500 inhabitants
– Suburbs served: Morada do Castelo, Montese 1 and 2, Agulhas Negras and Monet
– Treatment Type: UASB + Aeration Tank + Secondary Settler


— Located in: Visconde de Mauá
Treatment Capacity: 11 liters of wastewater per second
– Population served:  1,500 inhabitants
– Suburbs served: Visconde de Mauá
– Treatment Type: UASB + Aeration Tank + Secondary Settler

São Caetano WWTP

— Located in: São Caetano
Treatment Capacity: 4 liters of wastewater per second
– Population served:  1,700 inhabitants
– Suburbs served: São Caetano I and II
– Treatment Type: Tertiary

Capelinha WWTP

— Located in: Capelinha
Treatment Capacity: 1 l/s
– Suburbs served: Capelinha
– Treatment Type: UASB + Aerated Biofilter + Secondary Settler

Fumaça WWTP

— Located in: Fumaça
Treatment Capacity: 1 l/s
– Population served: 412 inhabitants
– Suburbs served: Vila da Fumaça
– Treatment Type: UASB + Aerated Biofilter + Secondary Settler