Table 1 Definition of extended microbiological thresholds according to the risk areas
Risk area | Parameter | Warning* | Threshold | Alert* | Worst case* |
|---|---|---|---|---|---|
1 and 2 | TMC 22°C and 36°C | 80 – 100 CFU/ml | >100 CFU/ml** | >200 – 500 CFU/ml | >500 CFU/ml |
|  | Coli-like, E. coli, Enterococci |  | 0 CFU/100 ml** | 1–10 CFU/100 ml | >10 CFU/100 ml |
|  | P. aeruginosa |  | 0 CFU/100 ml** | 1–10 CFU/100 ml | >10 CFU/100 ml |
|  | Legionella spp.(shower, tap) |  | 0 CFU/100 ml* | 1–100 CFU/100 ml | >100 CFU/100 ml |
|  | fungi |  | 0 CFU/100 ml* | 10–100 CFU/100 ml | >100 CFU/100 ml |
3 | TMC 22°C and 36°C |  | >100 CFU/ml** | >500 CFU/ml | >1000 CFU/ml |
|  | Coli-like, E. coli Enterococci |  | 0 CFU/100 ml** | 1–10 CFU/100 ml | >10 CFU/100 ml |
|  | P. aeruginosa |  | 0 CFU/100 ml** | 1–50 CFU/100 ml | >50 CFU/100 ml |
|  | Legionella spp.(shower) |  | 0 CFU/100 ml* | >5–50 CFU/100 ml | >50 CFU/100 ml |
| Â | Legionella spp. (tap) | Â | 0 CFU/100 ml* | >200 CFU/100 ml | >500 CFU/100 ml |