Microbial recontamination associated with household water use practices in Cambodia

An exploratory study of 30 households in a remote riverine island community in Cambodia found substantial microbial contamination on household drinking cups, even though stored river water used for drinking and domestic purposes was generally within national physicochemical guideline ranges. The results suggest that household handling, storage or use of drinking utensils may create opportunities for microbial recontamination. Researchers investigated household water-use conditions through three complementary activities: water-quality analysis, surface swab tests and field interviews.

Bathing-water samples were collected from eight households, drinking-water samples from nine households, and swabs were taken from household water-use utensils. The limited sample and exploratory design constrain the findings, which cannot establish a direct route from a particular practice to contamination or illness. The physicochemical measurements on stored river water were generally within the relevant national guideline ranges, although exceptions were observed.

Escherichia coli was detected in only a limited number of the water samples. These findings indicate that the sampled water was not uniformly contaminated with E. coli, even though some measured physicochemical parameters fell outside guideline ranges. The clearest microbial signal came from the drinking-cup swabs.

Total coliforms reached “too numerous to count” levels in every cup-swab sample, while some samples also yielded E. coli at “too numerous to count” levels. The contrast between the water and utensil results is central to the study. Relatively favorable measurements for stored water coexisted with heavily contaminated drinking-cup surfaces.

The evidence does not identify the exact moment or mechanism of contamination. Interviews with the 30 households revealed limited awareness of safe washing practices and microbial contamination risks. These accounts provided context for the laboratory findings and showed that routine household water use was not adequately covered by existing knowledge about contamination.

The interviews do not, however, quantify the frequency of individual practices or establish the independent effect of any behavior on the swab results. Several limitations restrict how broadly the results can be interpreted. The research concerned one remote island village, included water samples from only 17 households across two sampling categories and examined a defined set of household utensils.

Its findings therefore cannot by themselves establish the prevalence of similar contamination elsewhere in Cambodia or among other remote communities. Based on the exploratory evidence, the authors say capacity-building interventions—including training on safe water use and household hygiene management—may help reduce recontamination risks in remote areas. Such training is presented as a potential response rather than a tested intervention, because the supplied study evidence does not show that any training program reduced contamination or produced measurable health benefits.

Subject of Research: Household water handling and microbial recontamination in a Cambodian riverine community

Article Title: Microbial recontamination associated with household water use practices in a remote riverine island community in Cambodia

Article References: Yazawa, T., Watanabe, M., & Sato, J. (2026). Microbial recontamination associated with household water use practices in a remote riverine island community in Cambodia. Discover Sustainability. https://doi.org/10.1007/s43621-026-04725-1

Image Credits: AI Generated

DOI: 10.1007/s43621-026-04725-1

Keywords: microbial recontamination, household water safety, Cambodia, drinking cups, Escherichia coli, total coliforms, water quality, hygiene practices, riverine communities, field interviews, Microbial, recontamination