South America's most famous lake is being polluted by increasing 
levels of waste from fast-growing cities, according to locals, 
environmentalists and politicians.
Lake Titicaca, which sits on the border of Bolivia and Peru,
 has sustained agricultural societies on the dry, high-altitude Andean 
plains for thousands of years, but is now threatened by a population boom from nearby cities and towns.
El
 Alto  has grown at 4% a year for two decades as rural peasants seek a 
better life, and is now the country's second largest city and the 
largest urban centre in the Titicaca watershed.
But this migration has had devastating effects on the rivers
 of El Alto, communities downstream and Lake Titicaca. Raw sewage, 
garbage and industrial waste are all dumped into the Seco River, which 
flows through the heart of El Alto. At the edge of the city, where the 
Seco begins a 40-mile journey toward Lake Titicaca, it also receives 
treated wastewater from the city's severely overtaxed treatment plant. 
Those waters mix and travel out over the flat plains.
Because of 
its size and history, El Alto is a political powerhouse, yet the chronic
 poverty and lack of access to services widely faced by Bolivia's 
indigenous peoples persist there, and tackling pollution
 is a struggle. Changing the waste disposal habits of the sparsely 
populated countryside is one obstacle. But at the heart of the matter is
 weak enforcement of environmental laws and inadequate infrastructure.
"There
 is no complete and structured treatment of wastewater," said Marco 
Ribera Arismendi of the Environmental Defense League in La Paz. "The 
things governments have done so far are like giving an aspirin to 
someone who has been shot."
Edgar Patana Ticona, El Alto's mayor, 
says trying to enforce environmental standards in the city is a tough 
task. "If we monitor a specific business then the people who work there,
 the owner and all the neighbours begin to protest," he said. "And not 
so that we enforce the rules - but so the business can continue 
operating."
El Alto's budget depends on Bolivia's central 
government, and collects little from local taxes. A constantly expanding
 network brings drinking water
 to about 80% of the city's homes, and international funds are helping 
install more sewers – but the construction of a new plant to treat more 
wastewater is, at best, years away.
                
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