07/23/2025
All in for Water Quality -- Part 8: I’ll Be Watching You(r Water): How to Monitor Your Water Quality
ANSI/AAMI ST108:2023 Tables 5 and 6 outline the testing of the quality of your Utility, Critical, and Steam (condensate) Water at the point of water generation and the endpoints-of-use. Critical Water requires monthly sampling and testing, while Utility Water and Steam condensate can be tested less frequently (i.e. quarterly) if testing indicates that less frequent sampling is adequate.
There are a total of 18 water quality parameters in ST108 that define each water type, categorized into organic contaminants, corrosive agents, scaling agents, and basic water chemistry. Routine testing is required only on a subset of these (i.e. pH, conductivity, alkalinity, hardness, bacteria, endotoxin, and turbidity) if your water quality consistently meets the standard.
However, daily monitoring of Critical Water conductivity is required. It’s common for conductivity to be monitored with in-line sensors to ensure high-quality water is constantly being produced.
ST108 also recommends daily monitoring of the performance of filters, softeners, reverse osmosis systems, deionization tanks, UV irradiation systems, and circulation pumps. This can be done via manual inspection or by an automated monitoring system with alerts and alarms when equipment performance is Out-of-Trend or Out-of-Specification.
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