Table 6.
Assessment of hazardous events in the drinking water at houses by seven raters.
| Hazard | Hazardous event | Likelihood avg (SD) | Severity avg (SD) | Risk level avg (SD) |
|---|---|---|---|---|
| Microbial | Low level of disinfection below the recommended limit | 3.87 (0.98) | 4.02 (0.92) | 16.38 (6.93) (very high risk) |
|
| ||||
| Chemical and microbial | Excessive algal formations inside of desalinated water storage tank | 3.62 (1.05) | 3.82 (1.07) | 14.82 (6.96) (high risk) |
|
| ||||
| Microbial | The drinking water tank is not periodically washed with chlorine and soap | 2.07 (1.25) | 2.32 (1.42) | 6.48 (7.24) (medium risk) |
|
| ||||
| Chemical, physical, and microbial | Hand washing is not practiced before filling the drinking water storage tank | 2.33 (1.25) | 1.74 (0.78) | 4.91 (4.47) (low risk) |
|
| ||||
| Microbial | The desalinated water storage tank made of opaque plastic | 2.27 (1.37) | 1.47 (0.68) | 4.15 (4.34) (low risk) |
|
| ||||
| Microbial | Water discontinuity or stored for an extended period inside the desalinated water storage tank | 2.27 (0.88) | 1.47 (0.70) | 3.74 (3.18) (low risk) |
|
| ||||
| Microbial | The area around drinking water storage tank is unclean and has an animal or birds access | 1.39 (0.93) | 1.56 (2.23) | 3.28 (5.51) (low risk) |
|
| ||||
| Chemical | The desalinated water storage tank made of corrosive metal | 1.37 (0.92) | 1.51 (1.23) | 3.17 (5.49) (low risk) |
|
| ||||
| Chemical and microbial | Desalinated water is mixed with nondesalinated water | 1.46 (0.80) | 1.58 (1.01) | 3.08 (4.02) (low risk) |
|
| ||||
| Microbial | Drinking water storage tank is sited close to a toilet | 1.33 (0.89) | 1.42 (1.10) | 2.85 (5.28) (low risk) |
|
| ||||
| Chemical, physical, and microbial | Presence of foreign objects inside of desalinated water storage tank | 1.38 (0.73) | 1.50 (0.95) | 2.74 (3.65) (low risk) |
|
| ||||
| Chemical, physical, and microbial | The cap of the desalinated water tank is absent or partially opened | 1.38 (0.73) | 1.46 (0.86) | 2.61 (3.34) (low risk) |
|
| ||||
| Microbial | Children get drinking water directly from the tank tap by their mouths | 1.30 (0.88) | 1.31 (0.89) | 2.46 (4.70) (low risk) |
|
| ||||
| Microbial | The drinking water storage tank is leaking | 1.19 (0.67) | 1.25 (0.83) | 2.03 (3.74) (low risk) |
|
| ||||
| Microbial | The drinking water storage container sited at ground level | 1.20 (0.74) | 1.15 (0.58) | 1.80 (3.23) (low risk) |
|
| ||||
| Microbial | Spilled water accumulates around the drinking water storage tank | 1.18 (0.65) | 1.14 (0.49) | 1.66 (2.47) (low risk) |
|
| ||||
| Chemical and microbial | The water storage tank used to store other liquids other than desalinated water | 1.09 (0.46) | 1.14 (0.70) | 1.56 (2.86) (low risk) |
|
| ||||
| Chemical | A high level of overdosing of treatment chemicals (such as chlorine) | 1.01 (0.09) | 1.01 (0.12) | 1.03 (0.27) (low risk) |
Risk level = likelihood ∗ Severity