Jerry Chen

Baltimore County is getting a lot of complaints about rats. Jerry Chen, code-enforcement coordinator, looks at a few areas in Dundalk that have rat problems. (Lloyd Fox, Baltimore Sun / March 10, 2012)

In the alleys behind row homes in the Baltimore County neighborhood of Colgate, leaders of the local improvement association can see the telltale signs of the creatures they say have invaded their community.

Trash cans with no lids — the rats always find those. Garbage piled behind chain-link fences — feasts for the rodents. They've even made a home in what some call "Rat Mountain," a big mound of burrows in one front yard.

"Pretty much every household has been affected by it," said Dave Hyland, president of the Colgate Improvement Association.

The Dundalk neighborhood is part of County Council District 7, a waterfront area that is home to some of Baltimore County's most densely populated communities. The district features rowhomes, factories and piers along the Back River. It also has the county's biggest rat problem — by far.

No part of the county had half as many rodent complaints last year as the 807 filed in the area along the southeastern border of Baltimore City. Some residents say they're afraid of their own backyards because they're so overrun with rats.

The community has had to take things into their own hands. They report people who let their trash pile up. They distribute rat poison to neighbors.

"No citizen who pays taxes should have to live with rats," Hyland said.

Now the county plans to spend $150,000 annually over the next five years to treat its most infested areas. People whose neighborhoods are picked for treatment will be notified within a few weeks.

On recent drive through nearby West Inverness, another Dundalk neighborhood, code enforcement coordinator Jerry Chen could spot signs of infestation from his Chevy Suburban.

Yards filled with furniture and firewood. Piles of dog feces. Rows of rat burrows.

"Is this the rat police?" one woman called to Chen from her back steps. "There are more rats in this neighborhood than there are people!"

The woman, Miriam Lamkin, said she won't even go into her yard at night.

Two years ago, Baltimore County contracted with an exterminator to treat six communities in Dundalk, said Lionel Van Dommelen, head of code enforcement for the county. It helped for a while.

"The complaints are back on the rise, and folks just don't seem to understand that if they don't store their trash properly, that [the rats] are going continue to breed," he said.

The county will review complaint data to decide which neighborhoods will be treated in the eradication program, Van Dommelen said. They've already decided to treat Colgate, West Inverness, Berkshire, Riverview, Hawthorne, Norwood, Holabird and others. Residents will be able to opt out.

Some Colgate residents say they're frustrated with others who neglect their homes.

It used to be that "when you cut your grass, you sweep it up," said Cindy Kopicki, a former president of the improvement association.

"Not around here anymore," she said. "Now it lays in the street."

People who do take pride in their property can also suffer from rat infestations, Chen said. He pointed to one well-kept yard with several rat burrows by a shed.