Howard County's Department of Public Works will begin a four-year program to update some of its aging infrastructure by replacing the radio transmitters on residents' water meters. The transmitters send data to meter-reading trucks to compute water bills. The current devices use batteries with a 10-year life span, while the replacements should last 20 years. Bureau of Utilities staff will schedule appointments with residents whose water meter is inside their home. For more information, call 410-313-4900 or go to howardcountymd.gov/DPW/u_meters.htm.