Aguas de Niterói

In November 1999, the utility Águas de Niterói was commissioned to take care of water distribution and wastewater collection and treatment in the city of Niterói, state of Rio de Janeiro. With a population of more than 490,000 people, the city stands out in quality of life rankings, with one of the best sanitation services in the country. Over the concession period, investments in excess of BRL 1 billion will be made.

The city of Niterói is supplied by the Imunana-Laranjal system, operated by CEDAE. Through the Imunana canal, the system pumps untreated water taken from the Macacu River, which, in turn, receives water from the Guapiaçu tributary — to the Água Laranjal Treatment Plant in São Gonçalo. Of the total volume of water treated by the Laranjal WWTP, 2,100 liters per second are sent to Niterói.

In the first five years of operation, Águas de Niterói managed to bring treated water to 100% of the population, going over the 72% index witnessed before the concession. For this, the water distribution system fully covered the areas of Região Oceânica, Pendotiba and Várzea das Moças.
The company built 450 km of water distribution systems, 12 km of water mains and delivered about 30,000 household connections.

Over the past years, the utility has been working hard to improve the services to the population, such as building a new 6-million reservoir in Caramujo and another one in the city center, of 3 million liters. The company also built another three water reservoirs with total capacity of 9 million liters in Região Oceânica and Pendotiba.

Águas de Niterói reached one of the lowest rates of water waste in the country. When it took over in 1999, the index was 40% and dropped to 16%.
Before the arrival of Águas de Niterói, the city’s sewage collection and treatment system covered as little as 35% of the population but it has reached an important level. Through eight treatment plants, the utility provides 93% of the population with sewage collection and treatment. The company invested in construction works to expand the Toque-Toque WWTP to absorb the city’s growth and upgraded the Icaraí WWTP, supporting the clean-up of the Guanabara Bay.

Other investments were made, such as the construction of the sewage treatment plants of Itaipu, Camboinhas, Jurujuba, Barreto, Maria Paula, and the renovation of the Mocanguê WWTP. It built 280 km of sewage systems and 46 sewage pumping stations.

All the work done in the area brought important achievements to the city. In 2015, Niterói ranked 6th in the ranking published by Instituto Trata Brasil.

The company plans to universalize the services in the coming years by implementing a sewage collection system in Pendotiba and building the Sapê and Badu WWTPs.

The company also develops and supports social and environmental programs, such as the project “Niterói de Águas Limpas,” or Clean Waters for Niterói, which helps clean the Guanabara Bay using a state-of-the-art boating system that removes floating waste from the water surface.

  • Concession date: 05/11/1999
  • City: Niteroi (RJ)
  • Population: 491,807 people
  • Wastewater treatment plants: 8


Águas de Niterói started to run water distribution and wastewater collection and treatment services in the city on November 5, 1999. At the time, only 72% of the population was served with water supply and only 35% had sewage collection.


In October 2000, Águas de Niterói kicked off a program to prevent sewage dumping into the beaches of the southern coast. The Boa Viagem, Flechas and Icaraí beaches got cleaned of the sewage that used to be dumped there. These interventions resulted in positive rates of cleanliness in those beaches, which had been improper for bathing for more than 15 years.


From 2000 to 2001, the utility completed a range of projects that supported 130,000 inhabitants in 14 suburbs in Região Oceânica and Pendotiba. The projects include the construction of a 13-km water main and 490 km of water distribution systems; the construction of a 2,400 HP pumping station, two reservoirs of three million liters each and 40 water boosters. Águas de Niterói completed 40,000 household connections.


The year of 2002 witnessed the startup of two wastewater treatment plants: the Camboinhas WWTP (in February) and the Mocanguê WWTP (in April), the first plant to operate in Brazil at the tertiary level.


In November 2003, Águas de Niterói reached the important milestone of 100% coverage in terms of treated water, population and area, by supplying water to the suburbs of Várzea das Moças and Rio do Ouro. To do this, it laid over 30 km of distribution pipelines, built two reservoirs and completed 1,600 household connections. At the same time, the company invested in the expansion of the Sewage System. Although it was not in the contract, the company finished off the Icaraí Wastewater Treatment Plant, started in August 2003. That was an important contribution to the clean-up of the Guanabara Bay.



The Itaipu Wastewater Treatment Plant was started in January 2004. In May, it was time to start up the Toque-Toque Wastewater Treatment Plant in the city center.


The Jurujuba Wastewater Treatment Plant started operations in January 2004.


In partnership with the local government, Águas de Niterói opened up the Eduardo Travassos Municipal Park, also known as Parque das Águas, or Water Park, on June 8, 2006. The park is located in Morro da Detenção, in the city center, and holds the city’s largest water reservoir.

The Barreto WWTP began to be built in January of 2006 and treats the sewage collected from the suburbs Barreto and Engenhoca.

The Rumo Náutico Institute/Grael Project, supported by Águas de Niterói and Companhia de Limpeza de Niterói (Clin), started the project Niterói Águas Limpas (Clean Waters for Niterói), which monitors the flow of floating waste on the local beaches.


Niterói was one of the first Brazilian cities to reach the goal of 90% of the sewage collected and treated with the startup of the Barreto WWTP in February 2007. The newly started unit benefits 50,000 people from the suburbs Barreto and Engenhoca.


Águas de Niterói signed an agreement with the State Department of Environment to carry out the environmental recovery of the Macacu River basin, the main source of water for the Niterói supply system. The project, prepared by the Federal Rural University of Rio de Janeiro, includes reforesting the banks of the Macacu River and setting up a River Park.


This year, to keep up with the city’s continuous growth, Águas de Niterói completed expansion of a wastewater treatment plant in the central area of ??Niterói, the Toque-Toque WWTP, delivering a treatment capacity that outweighs the current volume of wastewater produced in the city.

Also, in 2009, a survey commissioned by the Federal Government and the sanitation departments reported that Niterói stands out in improvements in the coverage of water and sewage systems.


Two new water reservoirs were built in 2010: the Correção and Caramujo reservoirs. Together, they increased the city’s capacity by 9 million liters. Besides that, 40 new pumping units were set up to improve supply services in high-up locations, especially to serve the Região Oceânica area.

Giving a facelift to the beaches of Niterói by removing the floating waste from the Guanabara Bay is the objective of the Águas Limpas Project, launched this year by Águas de Niterói, in collaboration with the Grael Project, Rio’s Public Attorney’s Office and Companhia de Limpeza de Niterói (Clin).

The utility also upgraded the Operational Control Center and started the Sanitation Master Plan, which involves the construction of small wastewater treatment plants in Pendotiba in order to universalize the service.


All the work that Águas de Niterói has been doing in the area has resulted in important achievements in the city, which in 2012 was among the top 20 in the country in terms of sanitation, in a ranking released by Instituto Trata Brasil.



The water flow to the city increased from 1,800 liters per second to 2,100 l/s.

The utility built the São Francisco and Pendotiba reservoirs, totaling 6 million liters, and the Pendotiba – São Francisco water main. The Pendotiba reservoir center was expanded. The utility launched the Jurujuba Inlet Clean-up Program.


In 2014, the utility expanded the Itaipu reservoir center by building another 3-million-liter reservoir and finished off the expansion and capacity upgrade of the Wastewater Treatment Plant in Itaipu. This initiative allowed an increase in flow from 80 to 160 liters per second. A portion of the waste resulting from the entire treatment process will be used as reuse water in the WWTP, as well as to water gardens, wash roads and in industrial processes.

In the same year, the construction of the Maria Paula WWTP and the sewage system of Pendotiba were kicked off.

In the new customer service center of Itaipu, Águas de Niterói set up a modern water meter checking bench. This facility consists of two checking lines that conduct technical studies to ensure better management of the water meter pool, improve the design and selection of technologies and, consequently, more efficient measurement of water consumption.


In 2015, the sewage system of Ilha da Conceição was put into service. It has 8,914 meters of collection pipelines and seven sewage pumping stations.

In August, the utility began the upgrade of one of the main water pumping units that supplies water to the southern suburbs and the city center — the Correção I Booster.

At the end of the year, the utility started its eighth Wastewater Treatment Plant, the Maria Paula WWTP, which will be the first to integrate the sewage system of Pendotiba. The plant is designed to treat 35 liters per second and can reach 60 l/s at peak times.


On March 3rd, the company put into service a new water main at Rua Dr. March, in Barreto. With an investment of BRL 1.7 million, the equipment will improve water supply in Barreto, Engenhoca, Tenente Jardim and Fonseca. The water main will benefit more than 30,000 inhabitants with a flow of 150 liters of water per second.

Águas de Niterói set up, on March 7th, a new pumping unit located at Rua Fagundes Varela, with 125 HP and capacity of 250 liters per second. This unit will support water supply in Ingá, São Domingos and Boa Viagem, and will allowing greater operational flexibility, improving supply in the southern suburbs and in the city center.

On March 16th, Águas de Niterói started the operation of the Maria Paula Wastewater Treatment Plant, the city’s eighth WWTP and the first to join the Pendotiba wastewater treatment system.

Águas de Niterói also finished, on April 11th, the upgrade of the Jurujuba Treatment Plant (Jurujuba WWTP). With a total investment of BRL 1 million, the unit, which had been operating for 12 years, started to operate with a new bacterial fixation technology and a depth filter. The latter uses an Israeli technology that ensures greater retention of solid waste to make it possible to reuse treated waste.

On July 25th, the utility set up a sandbox on the São Francisco Canal, in Niterói. The initiative aims to retain the sand brought by the water flow, preventing it from reaching the canal mouth. The sandbox avoids silting and prevents much of the waste from getting into the collection system, clogging up the collecting pipes and protecting the pumps from early wear and tear.

In October, the utility started the second phase of the Correção I Booster upgrade. The booster is a water pumping unit that supplies water to southern suburbs and the center of Niterói.


On July 31st Águas de Niterói started the Campo de São Bento Canal Clean-up.

On September 27th, in partnership with the City of Niterói, the utility started building the Sapê Wastewater Treatment Plant. Scheduled to be completed by the end of 2018, the unit will be the ninth of the city and will be able to handle 63 liters per second, serving around 30,000 people from Sapê, Ititioca, Santa Bárbara and Caramujo.

The utility also started, on October 6th, the facelift project at the Eduardo Travassos Water Park, located at the top of Morro da Detenção, in the city center.

Niterói’s wastewater collection and treatment system includes 8 plants, reaching the impressive milestone of 90% of waste collected and treated in the city.

Learn more about the units:

Barreto WWTP

  • Located in: Barreto
  • Maximum Treatment Capacity: 85 l/s
  • Suburbs served: Barreto and Engenhoca
  • Type of treatment: Secondary level, with removal of 90% organic matter

Camboinhas WWTP

  • Located in: Camboinhas
  • Maximum Treatment Capacity: 116 l/s
  • Suburbs served: Piratininga, Camboinhas, Jacaré, Cafubá and Jardim Imbuí
  • Type of treatment: Tertiary treatment. In addition to removing 90% of organic matter, this unit removes nitrogen and phosphorus compounds

Icaraí WWTP

  • Located in: Icaraí
  • Maximum Treatment Capacity: 1,350 l/s
  • Suburbs served: Boa Viagem, Charitas, Cubango, Icaraí, Ingá, Santa Rosa, São Francisco and Vital Brazil
  • Type of treatment: Chemically assisted primary treatment. The plant dumps treated waste in the marine outfall of Icaraí

Itaipu WWTP

  • Located in: Itaipu
  • Maximum Treatment Capacity: 294 l/s
  • Suburbs served: Itaipu, Itacoatiara and Engenho do Mato
  • Type of treatment: Tertiary level. In addition to removing 90% of organic matter, the unit removes nitrogen and phosphorus compounds

Jurujuba WWTP

  • Located in: Jurujuba
  • Maximum treatment capacity: 30 l/s
  • Suburbs served: Jurujuba
  • Type of treatment: Secondary level, with 90% removal of organic matter

Mocanguê WWTP

  • Located in: Ilha de Mocanguê
  • Maximum treatment capacity: 30 liters per second
  • Suburbs served: Mocanguê navy base
  • Type of treatment: Secondary level, with 90% removal of organic matter

Toque-Toque WWTP

  • Located in: City center
  • Maximum treatment capacity: 525 liters of wastewater per second
  • Suburbs served: Centro de Niterói, Ponta D’Areia and some areas in Fonseca
  • Type of treatment: Secondary level, with 90% removal of organic matter

Maria Paula WWTP

  • Located in: Maria Paula
  • Maximum treatment capacity:63 liters of wastewater per second per module (three module)
  • Suburbs served: Maria Paula, Matapaca, Vila Progresso and Muriqui
  • Type of treatment: Secondary level, with 90% removal of organic matter

from the state of Rio de Janeiro.

At that time, only 0,7% of the population had their wastewater treated and the water supply system had a flow rate of 600 liters per second (l/s).