SAN ANTONIO – The San Antonio Water System has already installed digital meters that can monitor hourly water usage for nearly half of its customers. The city-owned water utility replaced its 300,000th Advanced Meter Infrastructure (AMI) meter Tuesday as part of its “ConnectH20″ program. Officials say they are on track to replace all customer meters – a little over 610,000 – by the end of 2025, about a year earlier than originally expected.