We’ll simplify what the standard requires, so you know exactly what to do.
Before you decide on equipment or changes, you need baseline testing. This gives you a clear picture of what’s in your water today and what problems exist.
AAMI ST108 describes a typical validation program as:
After PQ, ST108-style testing continues at a reduced frequency for at least one calendar year to find seasonal changes.
Below is a simple, practical list of what’s commonly tested for each ST108 water type, based on your ST108 testing reference.
Utility Water tests include:
Chloride, Nitrate, Sulfate, Phosphate, Iron, Copper, Manganese, Zinc, Aluminum, Total Hardness, pH, Total Alkalinity, Color & Turbidity, Bacteria, Conductivity, Silicate.
Critical Water uses a stricter panel. Tests include:
Chloride, Nitrate, Sulfate, Phosphate, Iron, Copper, Manganese, Zinc, Aluminum, Total Hardness, pH, Total Alkalinity, Color & Turbidity, Bacteria, Endotoxin, Total Organic Carbon (TOC), Conductivity, Silicate.
Steam testing includes:
Chloride, Nitrate, Sulfate, Phosphate, Iron, Copper, Manganese, Zinc, Total Hardness, pH, Total Alkalinity, Color & Turbidity, Conductivity, Silicate, Aluminum.
Note: Your exact plan depends on your system design and sampling points. The key is that you test the right water type at generation, after treatment, and at the point of use.
Before choosing any equipment, testing gives you the data you need to make the right decisions and stay audit-ready. These four steps show how testing supports a stronger, clearer, and more compliant water program.
Before choosing any equipment, testing gives you the data you need to make the right decisions and stay audit-ready. These four steps show how testing supports a stronger, clearer, and more compliant water program.
Testing reveals the true condition of your water so you know exactly which equipment is required. It prevents overbuying by showing what you need—and what you don’t—to meet ST108 standards.
A complete ST108 program requires documentation of what you tested, where you tested, and when. These records show consistency and demonstrate that monitoring is being performed properly.
Facilities must track water data over time, identify trends, and record deviations and corrective actions. This ongoing documentation ensures long-term compliance and keeps you fully prepared for audits.
We’ll help you select the right testing approach to confirm your current water quality, identify risks, and determine exactly what’s required to meet ST108 performance targets.
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Closed loops feed your heat exchangers too. Explore our Closed Loop Water Treatment and Glycol Solutions to stop corrosion before it reaches your boiler.
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For maximum reliability, combine your boiler program with Filtration Solutions to remove rust and debris before they enter your feedwater system
