Table 5.

Assessment of hazardous events in the tanker trucks 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	3.77 (0.80)	3.91 (0.85)	15.35 (6.01) (very high risk)
Chemical and microbial	Excessive algal formations inside the tanker truck tank	3.23 (1.07)	3.43 (1.06)	12.13 (7.27) (high risk)
Microbial	There is water leakage from the tanker reservoir or its pipes	3.79 (0.83)	2.85 (0.39)	10.98 (3.24) (high risk)
Chemical, physical, and microbial	The tanker truck is unlicensed and nonmonitored by the Ministry of Health	3.19 (0.86)	2.76 (0.48)	8.96 (3.31) (medium risk)
Chemical, physical, and microbial	The drainage tap at the bottom of the tank does not exist	2.86 (1.16)	2.35 (0.89)	7.59 (4.58) (medium risk)
Chemical and microbial	Desalinated water is mixed with nondesalinated water	2.35 (0.85)	2.56 (1.06)	6.87 (4.84) (medium risk)
Chemical, physical, and microbial	Presence of foreign objects inside of tanker truck tank	2.10 (0.87)	2.37 (1.08)	5.82 (4.43) (low risk)
Microbial	Water discontinuity or stored for an extended period inside the tanker truck tank	2.04 (0.85)	2.09 (0.95)	4.91 (3.97) (low risk)
Microbial	The parking garage of the tanker truck not sanitary	2.24 (1.03)	1.84 (0.86)	4.87 (4.43) (low risk)
Chemical and microbial	The delivery nozzle, pump, or hoses are dirty or in poor condition	2.00 (0.73)	2.12 (0.72)	4.70 (2.88) (low risk)
Chemical, physical, and microbial	The discharge pipes and hoses touch the ground	2.20 (0.91)	1.85 (0.82)	4.69 (3.74) (low risk)
Chemical, physical, and microbial	The cap of the tanker truck tank is absent or partially opened	1.60 (0.83)	1.88 (1.14)	3.90 (4.47) (low risk)
Chemical, physical, and microbial	The tanker truck engine exhaust and road contaminants affect the water quality	1.62 (0.86)	1.80 (1.05)	3.75 (4.33) (low risk)
Chemical, physical, and microbial	The overflow pipe is unclean or without protective mesh	1.68 (0.94)	1.67 (0.85)	3.47 (3.35) (low risk)
Chemical	The tanker truck desalinated water storage tank made of corrosive metal	1.53 (1.12)	1.49 (1.05)	3.44 (5.26) (low risk)
Chemical and microbial	The tanker truck tank used to store other liquids other than desalinated water	1.56 (0.65)	1.31 (0.57)	2.31 (2.07) (low risk)
Microbial	The tanker truck desalinated water storage tank made of opaque plastic	1.20 (0.74)	1.13 (0.50)	1.72 (2.73) (low risk)
Chemical	A high level of overdosing of treatment chemicals (such as chlorine)	1.08 (0.26)	1.03 (0.17)	1.14 (0.55) (low risk)

Risk level = likelihood ∗ Severity.