There, the mother of five fills her 25-litre (6.5-gallon) jerrycan with water, pays 150 Congolese francs (six US cents) and hauls the precious load back home.
Just a short distance away is the mighty Congo River, Africa's second-largest, and Kinshasa is buffeted by torrential rains for eight months of the year.
But for many in this rapidly growing megacity of an estimated 15 million people, running water that is safe to drink is a rarity.
Oto pointed to the other side of the valley, where she says there was a tap operated by the state water utility, Regideso.
"Sometimes the tap has water," she said. "If that happens, we all team up and go there."
The trek for water is a daily burden for people living in the neighbourhood of Selembao.
The problem is particularly acute on the outskirts -- vast swathes of the city that are almost completely cut off from public services and resemble densely populated villages.
"There are wells but finding water to drink is very difficult," says Pierre Mafula, 56, who moved to Selembao over a decade ago and lives at the bottom of a ravine. "It's dirty water. It's got amoebas."
Rapid population growth and a failure of public utilities to keep up is driving the water shortages, according to experts.
And the situation appears to be getting worse.
About 90 percent of households in the city had access to piped water in 2014, according to the World Bank. That proportion fell to 72 percent in 2018.
"Before 2010, water production was enough to cover the needs of the whole city," said Patrick Goy Ndolo, a senior water and sanitation specialist at the World Bank's Kinshasa office.
And the running water that is available may well pose a health risk. Over half of the piped water in Kinshasa is infected with E.coli, according to United Nations data.
- 'Water war' -
"It's very bad," says Alphonse Mbela Peko, 63, a resident of Selembao.
The privately-owned well near his home pumps water from just one metre (three feet) below the surface. He says it's not drinkable.
Peko travels up to five kilometres (three miles) to fetch water from a stream, but even then says it's easy to contract typhoid.
The DRC government has opened two new water plants in Kinshasa in as many years in a bid to fix the problem.
With the latest opening in February, President Felix Tshisekedi's office even declared victory over the what he termed as the "water war".
"We've doubled the capacity compared with five years ago," Giscard Kusema, the deputy director of communications in the president's office, told AFP.
But despite the efforts, swathes of Kinshasa remain unserved.
- 'Fend for themselves' -
Selembao, a neighbourhood of erosion-prone gullies and trash-strewn streets, is a textbook example of the difficulties that follow a population boom.
About 757,000 people out of 777,000 living in the neighbourhood originally come from outside of Kinshasa, according to a report by capital authorities this year.
And only 0.6 percent of the residents are signed up to Regideso.
The fallback is private wells, which are often built cheaply.
Gautier Dianzitu Kulu-Kimbembe, who runs a non-profit that builds wells in Selembao, said Regideso once served the entire commune.
But runaway construction linked to population growth -- and landslides driven by erosion -- had damaged the network, he explained.
"People are left to fend for themselves, forced to walk for kilometres to fetch water," Kulu-Kimbembe said.
"It's mainly women and children who suffer".
Neither Regideso nor the DRC's hydraulic resources ministry responded to requests for comment.
Latvia beaches closed after spill from sewage treatment plant
Riga (AFP) July 25, 2023 -
An accident at a sewage treatment plant in western Latvia has caused a large spill of untreated waste into the Baltic Sea, leading to the closure of beaches and a ban on swimming, local authorities said Monday.
At least 1,250 tonnes of waste containing sulphurous sludge leaked out following the collapse on Sunday of a wall at the plant in Liepaja, a coastal city of 70,000.
"We don't know when we will manage to fix the broken sludge tanks, which is why I advise all residents of Liepaja to pour less water down the toilet, because now all the sewage is being discharged into the open sea," Liepaja mayor Gunars Ansins told LTV1 television channel.
Latvia's health inspectorate ordered the closure of all beaches from the border with Lithuania in the south to the town of Pavilosta, 40 kilometres (25 miles) north of Liepaja, and banned swimming in the Baltic Sea.
"There is no threat to people's health. We are doing everything possible to stop the discharge of pollution into the Baltic Sea as soon as possible," Ansins said in a separate announcement on the city's website, adding that the water quality was being monitored.
The national environmental protection service has opened an investigation into the accident, saying 400 tonnes of waste an hour continued to wash up in the sea.
"The waste management system is capable of storing 21,000 cubic metres of liquid waste, but this capacity is only enough to last two days, so we are building a temporary pipe to bypass the collapsed part of the recycling plant," Andis Dejus, CEO of utility company Liepajas Udens, which operates the municipal water supply and recycling systems, told reporters.
Dejus noted that the damaged building was relatively new, having been built in 2009.
Geologist Baiba Grinberga said on her Facebook account that "geotechnical studies 20 years ago had already revealed (the existence of) unstable ground in the region but the recycling plant had been built anyway".
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