INDIANAPOLIS (AP) — The state has begun a new system to alert residents in four northern Indiana counties through a mobile alert system when beaches are closed because of E. coli contamination.

The Indiana Department of Environmental Management says its Indiana BeachesAlert will let people know when water is unhealthy for swimming and other recreational activities.

It will monitor beach conditions and alerts at public and private beaches in Lake, Porter, LaPorte and Kosciusko counties.

IDEM says the Indiana BeachesAlert mobile Web site allows visitors to obtain real-time information throughout the summer season.

It's online at www.in.gov/idem/5389.htm .

IDEM the new service supplements the existing online BeachGuard System, which compiles water quality data from mid-May through mid-September.