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Legionella pneumophila sg5 contamination of the drinking and hot water distribution systems (WDS) before and after the start of continuous disinfection with monochloramine (2–3 mg/L).
| Water Distribution System | Positive > 103 cfu/L N (%) | |
|---|---|---|
| Before | After | |
| Cold water | 0/8 (0%) | 0/8 (0%) |
| Hot water | ||
| Taps | 221/221 (100%) | 0/221 (0%) |
| Showers | 220/220 (100%) | 0/220 (0%) |
| Storage tanks | 32/32 (100%) | 0/32 (0%) |
