Background The water sanitary condition of swimming pools is closely related to the health of swimmers. Water quality indexes are intuitive reflections of water sanitation. The accuracy and standardization of water quality index test directly affect the quality of random health supervision and inspection work. Therefore, it is very important to conduct quality control of water quality inspection in the sanitary supervision and inspection of swimming places.
Objective This study is conducted to assess the work quality of water quality inspection service providers in double random supervision and inspection of swimming places in Shanghai.
Methods Technicians from 20 institutions including district-level supervision agencies of health commission, district-level centers for disease control and prevention, and third-party technical service institutions were randomly dispatched to collect water samples of 32 randomly selected swimming places in Shanghai and determine the water quality indicators such as turbidity, pH, free residual chlorine, urea, total number of colonies, and total coliforms. The Shanghai Public Health Supervision Technical Service Quality Control Center (the quality control center) performed synchronous sampling and testing on site. Combined with process evaluation, synchronous testing result evaluation, and normative evaluation of test reports, the work quality of random supervision and inspection in Shanghai swimming places were evaluated.
Results The problems in the on-site sampling and testing process of the service providers were mainly reagent inspection, sample storage and transportation, original records, and instrument operation. The synchronous testing results showed that 25 items of 13 samples were inconsistent between the service providers and the quality control center; the overall consistent rate of single index was 94% (389/414); there were differences in the overall qualified rate of pH (χ2=10.276, P=0.001). The overall normative evaluation scores of test reports of the district-level supervision agencies of health commission, district-level centers for disease control and prevention, and third-party technical service institutions were 98.3, 95.5, and 88.3, respectively. The problems mainly focused on the integrity and standardization of sample information and the traceability of original inspection records.
Conclusion Under the existing double random supervision and inspection mode, the test results given by the service providers are reliable. The key points of quality control of water quality inspection in swimming places in Shanghai include the standardization of sampling, testing, and records. Relevant supervision departments should strengthen the quality management of health inspection, establish and improve a more systematic and scientific quality control mode of public health supervision technical service, and ensure the quality of health supervision and inspection.
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