Is Tap Water Safe to Drink in Paraguay?

ESSAP, the state water utility, treats surface water from the Paraguay River to supply Asunción and surrounding areas. Outside the capital, more than a third of the population relies on private wells, rainwater cisterns, or small community systems (juntas de saneamiento) with less consistent treatment.

Asunción's treated supply generally meets acceptable standards for chlorination, though aging pipes can still pose a risk. Rural groundwater, particularly in the arid Chaco region west of the Paraguay River, often has natural arsenic contamination and higher salinity, alongside bacterial risks from inadequately protected wells.

Asunción and nearby urban areas have the country's most reliable water, though bottled water is still commonly recommended for visitors. The Chaco region and rural eastern communities carry higher risk due to both natural groundwater contamination and inconsistent treatment infrastructure.

Asunción's river-sourced water is moderate, roughly 60–150 mg/L; Chaco groundwater can be much harder and saltier, sometimes exceeding 300 mg/L..

Many residents of Asunción drink tap water, though rural Paraguayans, especially in the Chaco, commonly rely on rainwater cisterns or bottled water instead.

• •Bottled water is a reasonable default even in Asunción, particularly for short-term visitors
• •Be especially cautious with well water in the Chaco region, where arsenic contamination is a known issue
• •Ask rural guesthouses and estancias whether their water is tested or filtered

• •Avoid well water in the Chaco region due to natural arsenic and salinity concerns
• •Use bottled or filtered water in rural areas outside Asunción