Evanston’s utilities department warned property owners Wednesday that companies offering water and sewer service line insurance are not associated with the city.

“As with any insurance or warranty program, individuals should do their own due diligence to check the company’s reputation and references and to confirm covered services and exclusions,” the release said.

The department also reiterated that property owners are responsible for water and sewer service lines from the city-maintained equipment into their property.

Though average work on water and sewer line permit applications totaled in the thousands of dollars, only a small proportion of applications were made in 2011. Applications for private water service line repairs, for instance, represented less than 0.1 percent of the city’s approximately 14,400 water services.

— Manuel Rapada