Iowa Water Center

Non-point source pollution from urban and agricultural lands is the leading source of water impairment. Major pollutants are siltation, nutrients, bacteria, metals, and oxygen-depleting substances. Despite federal and state agency efforts and millions of tax dollars invested since the passage of the 1972 U.S. Clean Water Act, recent state reports document close to 40 percent of the waters surveyed as too polluted for basic uses like fishing or swimming.

The impact of clean water technologies on public health in the U.S is estimated to have had a rate of return of 23 to 1 for investments in water filtration and chlorination during the first half of the 20th century.  

Project AWARE is one of Iowa’s best known river clean-up projects. Each year, volunteer “aquatic garbage collectors” gather with boats, kayaks, and boots to pull trash from a river and improve its watershed area. In a recent effort 429 volunteers pulled 32 tons of tires, metal, and other trash from 88 miles of river waters in a northeast Iowa watershed.  

Consider that the earth’s surface is 70% water. Of this, about 97% is salty or otherwise undrinkable. The remaining 3% is largely in the form of Ice caps and glaciers. Only a very limited supply is available to meet sanitation and drinking water needs. There is no “new” water to add to the earth’s supply. The same water that plants and animals relied on millions of years ago is still being recycled by the earth’s natural processes today. Conserving and keeping the limited supply of useable water clean is crucial for the world’s growing population. 

In the United States the daily per-capita water use is about 1,400 gallons. (For an Iowan in 2000, the estimate was about 1,100 gallons). This includes all uses—irrigating, mining, manufacturing, as well as domestic use. By comparison, per-capita daily water use around the world ranges from 5 gallons in Haiti to over 3,000 gallons in Iraq, with a worldwide average of 475 gallons.

The United States has one of the world’s best drinking-water supplies. However, much of today’s infrastructure (underground pipes, treatment plants, and other facilities) that delivers water to our homes is aging and in disrepair. In 1999, the Environmental Protection Agency found that drinking water systems would need a $150 billion investment over a 20-year period to ensure clean and safe drinking water. Reducing pollution of drinking-water sources can help relieve the demands on water infrastructure.