ASHRAE 188 Legionella Testing Template
Standardized log for recording water quality parameters – temperature, disinfectant residual, pH – and corrective actions in accordance with ASHRAE Standard 188: Legionellosis: Risk Management for Building Water Systems.
This template documents routine testing of water quality parameters as part of a facility’s Legionella Water Management Plan (WMP) per ASHRAE Standard 188-2021. Regular logging ensures that temperatures remain outside the Legionella growth range (20–50 °C), disinfectant residuals stay within target levels, and corrective actions are tracked. Use this form in conjunction with your facility’s WMP and any applicable local health authority regulations.
- Lockout/Tagout water heaters, circulation pumps, and any chemical feed systems before performing maintenance or accessing ports.
- Wear nitrile gloves, safety glasses, and heat‑resistant gloves when sampling hot water (≥60 °C). Use a face shield if splash risk exists.
- Verify chemical feed (if any) is properly isolated before sampling. Never mix disinfectant samples with other chemicals.
Inspection / Log Matrix
| Status (P/F) | Inspection Item / Task | Tolerance / Threshold | Actual Reading |
|---|---|---|---|
| [ ] Pass [ ] Fail | Hot water temperature at distal outlet (furthest fixture) | ≥ 60 °C (140 °F) after 1 minute flow | _________ °C |
| [ ] Pass [ ] Fail | Hot water return temperature at recirculation loop | ≥ 55 °C (131 °F) | _________ °C |
| [ ] Pass [ ] Fail | Cold water temperature at distal outlet | ≤ 25 °C (77 °F) | _________ °C |
| [ ] Pass [ ] Fail | Free chlorine residual (if chlorinated system) | 0.5 – 2.0 mg/L (ppm) | _________ ppm |
| [ ] Pass [ ] Fail | pH of water | 6.5 – 8.5 | _________ pH |
| [ ] Pass [ ] Fail | Visual inspection: sediment / biofilm at designated sampling point | No visible discoloration or slime | □ Clear □ Turbid □ Slime |
Defect / Corrective Action Log
| Date / Time | Item # | Issue Identified | Corrective Action Taken | WO # |
|---|---|---|---|---|
| ___/___/_____ | _______ | _______________________________ | _______________________________ | _______ |
| ___/___/_____ | _______ | _______________________________ | _______________________________ | _______ |
By signing below, the inspector verifies that all water quality tests have been performed according to the facility’s Water Management Plan and that any out-of-specification conditions have been recorded with a corresponding corrective action.