WaterAid raised a record £65.6m in 2012/13, an 18 per cent increase on the previous year, according to its latest annual report.
The report from the international development charity, which works to improve access to safe water, hygiene and sanitation, shows that grant funding for specific activities increased by 50 per cent to £21m.
Donations were up by 8.3 per cent to £39m and total voluntary income increased from £55.8m to £65.6m in 2012/13, the accounts show.
WaterAid, which will hold its annual general meeting today, had more than 368,000 individual donors by the end of 2012/13, of whom 283,000 were regular givers, the report says.
The charity spent £13.7m on fundraising in 2012/13, compared with £11.2m the previous year.
Jeremy Pelczer, chair of WaterAid UK, said the charity was making progress towards its ambitious global strategy of directly reaching 25 million people with water and sanitation between 2009 and 2015. So far, it has reached a total of 5.6 million people with safe water and nearly seven million with sanitation since 2009.
Pelczer will stand down as chair today after six years in the role, although he will continue to be chair of WaterAid international.
Tim Clark, a former senior partner of the leading international law firm Slaughter and May, was announced as the preferred candidate to take over from Pelczer in July and is expected to be confirmed in post at the AGM today.