The number of U.S. homeowners ensnared in the foreclosure crisis grew by more than 70 percent in the third quarter compared with the same period in 2007, according to data released Thursday.

Nationwide, nearly 766,000 homes received at least one foreclosure-related notice from July through September, up 71 percent from a year earlier, said foreclosure listing service RealtyTrac.

By the end of the year, RealtyTrac expects more than a million bank-owned properties to have piled up on the market, representing around a third of all properties for sale in the U.S.

That's bad news for anyone who lives nearby and wants to sell their home. While foreclosure sales are booming in many areas, those properties are commanding deep discounts and pulling down neighboring property values. "It has a pretty significant impact in terms of pricing," said Rick Sharga, RealtyTrac's vice president for marketing.

RealtyTrac monitors default notices, auction sale notices and bank repossessions. More than 250,000 properties were repossessed by lenders nationwide in the third quarter, 81,000 of which were taken back last month.

Wisconsin had 5,450 properties with foreclosure filings during the quarter, down 12.3 percent from the previous quarter, but up 43.7 percent from the third quarter last year.

With 1,544 foreclosure filings in September, or one for every 1,641 households, Wisconsin ranked 36th in its foreclosure rate for the month. The state's filings were down 30.6 percent from August and up 3.1 percent from September 2007.

Dane County had 344 properties with foreclosure filings during the third quarter, down 29 percent from the 486 properties during the previous quarter and up 43 percent from the 240 properties during the third quarter last year.

The county's 45 foreclosure filings in September were down 72 percent from 158 in August and down 39 percent from 74 a year ago.

Six states — California, Florida, Arizona, Ohio, Michigan and Nevada — accounted for more than 60 percent of all foreclosure activity in the quarter, with California alone making up more than a quarter of all U.S. foreclosure filings.

Detroit and Atlanta were the only cities outside California, Florida, Nevada and Arizona to make RealtyTrac's list of the 20 hardest-hit metropolitan areas.

The combination of sinking home values, tighter mortgage lending criteria and an economy that many economists think has already slipped into recession has left hundreds of thousands of homeowners with few options. Many can't find buyers or owe more than their home is worth and can't refinance into an affordable loan, with the global credit crisis making loans far less available.

For those who can qualify for a loan, or have cash to invest, there are bargains to be had, especially in ravaged markets like Nevada and California. Last month, foreclosure resales accounted for more than half of existing home sales in California last month, as home sales jumped 65 percent from a year ago, while the statewide median home price fell 34 percent to $283,000, according to MDA DataQuick.

RealtyTrac, however, reported foreclosure filings in September were actually down 12 percent from August. But much of that decline was the result of new state laws that delay the foreclosure process. In California, for example, lenders are now required to contact borrowers at least 30 days before filing a default notice. A similar law in North Carolina gives borrowers an extra 45 days.

Still, that's not likely to be enough to save homeowners who owe more on their mortgages than their homes are worth. Nearly 12 million of the 52 million Americans with a mortgage — that's 23 percent of them — are in that position, according to Moody's Economy.com.

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