More than a quarter of the nation’s bridges are structurally deficient or functionally obsolete. Leaky pipes lose an estimated seven billion gallons of clean drinking water every day. And aging sewage systems send billions of gallons of untreated wastewater cascading into the nation’s waterways each year.

These are among the findings of a report to be released Wednesday by the American Society of Civil Engineers, which assigned an overall D grade to the nation’s infrastructure and estimated that it would take a $2.2 trillion investment from all levels of government over the next five years to bring it into a state of good repair.

The society had planned to release the report in March, but moved it up to try to influence the debate over the $825 billion economic stimulus bill being negotiated by the Obama administration and Congress. Advocates for greater investment in public works projects have expressed disappointment that less than a third of the current proposal  which could be approved by the House on Wednesday  would be spent on infrastructure, and an even smaller part of that would go toward traditional concrete-and-steel projects like roads and transit.

“Crumbling infrastructure has a direct impact on our personal and economic health, and the nation’s infrastructure crisis is endangering our future prosperity,” the president of the society, D. Wayne Klotz, said in a statement. “Our leaders are looking for solutions to the nation’s current economic crisis. Not only could investment in these critical foundations have a positive impact, but if done responsibly, it would also provide tangible benefits to the American people, such as reduced traffic congestion, improved air quality, clean and abundant water supplies and protection against natural hazards.”