Community Water Research Articles

Morphological and Microbial Diversity of Hydromagnesite Microbialites in Lake Salda: A Mars Analog Alkaline Lake

ABSTRACTLake Salda, a terrestrial analog for the paleolake in Jezero Crater on Mars, hosts active, subfossil, and fossil hydromagnesite microbialites, making it an ideal location to study microbialite formation and subsequent processes. Our understanding of this record is still limited by an incomplete knowledge of the macro‐ and mesoscale morphotypes of microbialites, along with their spatial distribution and correlation with microbial and geochemical processes that influence microbialite formation. In this study, we investigated the spatial distribution, morphotypes, mineralogy, geochemistry, and microbial diversity of the microbialites and identified six distinct zones (Zone I to Zone VI) with major microbialite build‐ups in Lake Salda. Newly identified microbialites were classified based on the macro‐ and mesostructures. Our work shows that the lake contains stromatolites, thrombolites, stromatolitic thrombolites, dendrolites, and microbially induced sedimentary structures. At macroscale, Lake Salda microbialites exhibit hemispheres, stacked domes, and laterally linked columnar structures while minicolumns, knobs, mesoclots, laminae, and botryoidal structures are common at mesoscale. The macro‐ and mesoscale distribution of different microbialite types spatially correlates with microbial community composition and water depth. Deep‐growing microbialites with a low abundance of Cyanobacteria (∼1%–4%) and high abundance of Firmicutes (28%–93%) exhibit steeply convex lamination, producing finger‐like minicolumnar mesostructures. In contrast, shallow‐growing microbialites with a low abundance of Firmicutes (0%–5%) and high abundance of Cyanobacteria (11%–37%) have well‐preserved gently convex millimeter‐scale lamination, resulting in cauliflower mesostructures. Palygorskite ((Mg, Al)2Si4O10(OH)) is identified in the diatom‐rich microbial layer of the deep‐growing microbialites. Regardless of the microbialite types, hydromagnesite and aragonite are present in the extracellular polymeric substance (EPS)‐rich zone of the shallow and deep‐growing microbialites. Overall, environmental changes (e.g., water depth and, accommodation space) play a major role in the formation and spatial distribution of different microbialite morphologies at the macro‐ and mesoscale. Differences in the relative abundance of dominant microorganisms between mesostructured types suggest that mesomorphology may be influenced by changes in microbial diversity. Spatial variations in the microbialite morphotypes, along with the abundant presence of entombed biomass (e.g., mineralized filaments), may indicate areas that have a high potential for the preservation of biosignatures.

Impact of Droughts on Served Drinking Water Disparities in California, 2007-2020.

Objectives. To quantify the impact of droughts on drinking water arsenic and nitrate levels provided by community water systems (CWSs) in California and to assess whether this effect varies across sociodemographic subgroups. Methods. I integrated CWS characteristics, drought records, sociodemographic data, and regulatory drinking water samples (n = 83 317) from 2378 water systems serving 34.8 million residents from 2007 to 2020. I analyzed differential drought effects using fixed-effect regression analyses that cumulatively accounted for CWS-level trends, income, and agricultural measures. Results. CWSs serving majority Latino/a communities show persistently higher and more variable drinking water nitrate levels. Drought increased nitrate concentrations in majority Latino/a communities, with the effect doubling for CWSs with more than 75% Latino/a populations served. Arsenic concentrations in surface sources also increased during drought for all groups. Differential effects are driven by very small (< 500) and privately owned systems. Conclusions. Impending droughts driven by climate change may further increase drinking water disparities and arsenic threats. This underscores the critical need to address existing inequities in climate resilience planning and grant making. (Am J Public Health. 2024;114(9):935-945. https://doi.org/10.2105/AJPH.2024.307758).

Experience of Visiting an Urban Slum: A Medical Student’s Perspective

Urban slums are densely populated areas characterized by inadequate housing, poor sanitation, and limited access to essential services. As part of the MBBS curriculum at Patan Academy of Health Sciences (PAHS), we visited an urban slum in Balkhu to assess the community's health-seeking behaviour, water facilities, and education. This article highlights the significance of such postings in equipping medical students with critical skills, including empathy, teamwork, and leadership, necessary for addressing the socio-economic determinants of health. The experience provided an invaluable opportunity to engage with real-world challenges, fostering a deeper understanding of the healthcare needs of underserved populations. These insights are vital to medical students in shaping a compassionate and socially responsible approach in their practice.

Monitoring climate change vulnerability in the Himalayas.

Longitudinal assessment of climate vulnerability is essential for understanding the complex factors affecting how people experience and respond to climate change. We report on the first longitudinal assessment of climate vulnerability in the Himalayan region, exploring the evolving landscape, perceptions, and experiences of communities of climate change impacts, vulnerability, and adaptation in Kashmir over an 8-year period from 2017 to 2024. We provide the Himalayan Re-study Framework (HRF) to monitor, characterise, and conceptualise climate change in the Himalayas. Utilising mixed methods, we showcase how climate change is affecting social, economic, political, and environmental dimensions, examining how the impacts of climate change and vulnerability evolve over time, shaping and reshaping how climate risks are experienced and responded to by communities. Our analysis reveals a nuanced understanding of vulnerability, highlighting the impact on communities' livelihoods and water security, differential impacts on marginalised communities, and the gendered nature of climate change. We examine how certain sections of the population face marginalisation, discrimination, and racism, and how climate change exacerbates these challenges. Kashmir's vulnerability to climate change extends beyond environmental factors, intertwining with culture, livelihoods, social dynamics, and politics. Climate change continues to compete for attention with immediate political and socio-economic challenges, highlighting the need for integrated approaches to address both environmental and societal issues in Kashmir.

BACTERIOLOGICAL QUALITY OF DRINKING WATER AND ASSOCIATED FACTORS AT COMMUNITY POINT SOURCES, IN ARUA DISTRICT, UGANDA

Background: Access to ample and safe water is vital, yet many globally lack this essential resource. Each year, 3.4 million individuals die from water-related diseases. Specifically, in Uganda, annual estimates suggest 89,000 cholera cases, resulting in 3,000 deaths. Objective: This study aimed to evaluate the bacteriological quality of drinking water and related factors in Arua Districts community water sources. Method: Utilizing a cross-sectional design and laboratory experiments, 140 samples were analyzed for coliform bacteria presence on filter membranes. Factors relating to contamination risks were identified via a sanitary inspection checklist. Data analysis was conducted using Stata/SE 17.0. Results: About 70.71% of samples contained bacteria, primarily total coliform. Significant risk factors included defective wastewater drainage (aOR: 19.7[5.34-72.72]), malfunctioning appliance parts (aOR: 10.7[2.52-45.92]), and inadequate or absence of fencing (aOR: 9.2[2.43-34.96]), each with a P-value &lt;0.001. Conclusion: Ensuring safe drinking water requires treatment, quality monitoring, maintenance of appliances, and proper fencing to reduce bacterial contamination.

Climate Change Intersecting Socio-economic Vulnerabilities of Kalash Indigenous Community in Nothern Pakistan

Climate Change has a significant effect on all walks of life or human activities across the world. However, indigenous communities in different parts of the world are more susceptible to the worst effects of climate change due to their dependency on natural resources. Climate change directly affects natural resources such as forests, water, grazing land, bio-diversity and traditional foods of indigenous communities. This study explores how climate change overlaps or intersects the socio-economic, and bio-cultural marginality of the Kalash indigenous community, living in northern Pakistan. The qualitative research paradigm was used to explore how climate change overlaps or intersects the socio-economic marginality of the Kalash Indigenous community. It reveals that climate change has significantly affected natural resources such as water, biodiversity, forests and crops of Kalash's indigenous community. Climate-induced natural disasters affected their livelihood resources and compelled them to migrate or be displaced from their native town. It reveals that climate change also affects women's marginality in Kalash's indigenous community. It also reveals that climate change overlaps and intersects with the socio-economic marginality of Indigenous communities and policymakers should give priority to indigenous communities who have a dependency on natural resources to protect them from the worst effect of climate change across the world.

Exploring the institutional barriers to rural water management in Ghana

ABSTRACT Framed within policy support for bottom-up community water management in development practice in the global south, this paper explores the institutional barriers that impede effective community management of water infrastructure in water-stressed rural communities in the Upper Manya District and Yilo Krobo Municipality in the Eastern region of Ghana. The study adopted a qualitative research approach, using data collection methods such as in-depth interviews and focus group discussions with local government and community water management committees and participant observation across four communities. The findings revealed that irregular and inadequate monitoring, poor financial auditing and transparency, inadequate technical support, and limited community engagement were the institutional barriers confronting sustainable rural water management. The study argues that in community water management, hybrid models are more likely to work better than models that focus entirely on either top-down or bottom-up approaches since the former can strengthen technical capacity, financial accountability, and the experimentation of infrastructure co-design initiatives. The paper concludes that by addressing institutional lapses in Africa's infrastructural management regimes, rural populations can become part of, rather than left behind, in the global quest to ensure water availability and sustainable water management for all.

Enteric viruses and SARS-CoV-2 in environmental water in rural communities of Osun State, Nigeria

Enteric viruses and SARS-CoV-2 in environmental water in rural communities of Osun State, Nigeria

Weaving different forms of knowledge of managed aquifer recharge in a Saharan oasis (Algeria)

This paper demonstrates the reciprocal benefits of a socio-hydrology approach that fosters fruitful exchanges between different ‘knowers’ of complex water dynamics in weaving different types of knowledge. For centuries, the managed aquifer recharge and use system in the Beni Isguen oasis in Algeria was diligently monitored by communal water stewards and the data meticulously recorded and stored. Throughout our research project on the origin of groundwater and its replenishment, intense dialogue between scientists and communal water stewards greatly enhanced the research protocol based on isotope tracers, while simultaneously contributing to the active knowledge base of the community. The dialogue was based on mutual respect, trust and a reciprocal desire to share knowledge. Our findings revealed increased mineralization of shallow groundwater during drought periods, which was attributed to geological processes, and emphasized the crucial role of floods. Also, contrary to the initial assumption that deep Continental Intercalaire groundwater was only used for drinking, it was identified as a vital external resource, responsible for substantial recharge of the phreatic aquifer of the oasis. This source of water explains the continued use of the phreatic aquifer for irrigation more than 10 years after the last major flood. This collaborative socio-hydrology approach between differently situated ‘knowers’ contributes to the grounding of socio-hydrology. While respecting the strong water conservation culture, weaving different forms of knowledge may help develop a virtuous and original development model in the Algerian Sahara and beyond.

Identification and mapping of groundwater recharge zones using multi influencing factor and analytical hierarchy process.

The management of groundwater systems is essential for nations that rely on groundwater as the principal source of communal water supply (e.g., Mohmand District of Pakistan). The work employed Remote Sensing and GIS datasets to ascertain the groundwater recharge zones (GWRZ) in the Mohmand District of Pakistan. Subsequently, a sensitivity analysis was conducted to examine the impact of geology and hydrologic factors on the variability of the GWRZ. The GWRZ was determined by employing weighted overlay analysis on thematic maps derived from datasets about drainage density, slope, geology, rainfall, lineament density, land use/land cover, and soil types. The use of multi-criteria decision analysis (MCDA) involves the utilization of the multi-influencing factor (MIF) and analytical hierarchy procedure (AHP) to allocate weights to the selected influencing factors. The MIF data found that very high groundwater recharge spanned 1.20%, high zones covered 40.44%, moderate zones covered 50.81%, and low zones covered 7.54%. In comparison, the AHP technique results suggest that 1.81% of the whole area is very high, 33.26 is high, 55.01% is moderate, and 9.92% has low groundwater potential. The geospatial-assisted multi-influencing factor approach helps increase conceptual knowledge of groundwater resources and evaluate possible groundwater zones.

Uranium and arsenic from community water supplies and chronic kidney disease in California: Novel findings for exposures below regulatory limits

Uranium and arsenic from community water supplies and chronic kidney disease in California: Novel findings for exposures below regulatory limits

Trihalomethanes from residential community water supplies and chronic kidney disease risk among women in California

Trihalomethanes from residential community water supplies and chronic kidney disease risk among women in California

Regulated water contaminants in community water supplies in the California Teachers Study cohort

Regulated water contaminants in community water supplies in the California Teachers Study cohort

Implementing an Environmental Contaminants Deliberation Module in General Chemistry.

Placing chemistry in the context of complex societal issues is one way to help students see the application of fundamental ideas in the general chemistry curriculum. Here, we describe the impact of an in-class deliberation on environmental contaminants, which encourages students to consider different perspectives when addressing the issue of water and soil quality in communities. Student surveys were used to analyze the quality of the deliberation and several key factors regarding student attitudes before and after the activity. Students report a high-quality experience during the deliberation, wherein new ideas were introduced and they carefully considered different views on the issue at hand. Not only do students gain scientific knowledge about lead contamination, they also demonstrate statistically significant gains in their attitudes toward chemistry and their motivation to take action. As a complement to traditional teaching methods, this deliberation module can address key learning outcomes in systems thinking and the impact chemistry has on society.

Public drinking water contaminant estimates for birth cohorts in the Environmental Influences on Child Health Outcomes (ECHO) Cohort.

The United States Environmental Protection Agency (USEPA) regulates over 80 contaminants in community water systems (CWS), including those relevant to infant health outcomes. Multi-cohort analyses of the association between measured prenatal public water contaminant concentrations and infant health outcomes are sparse in the US. Our objectives were to (1) develop Zip Code Tabulation Area (ZCTA)-level CWS contaminant concentrations for participants in the Environmental Influences on Child Health Outcomes (ECHO) Cohort and (2) evaluate regional, seasonal, and sociodemographic inequities in contaminant concentrations at the ZCTA-level. The ECHO Cohort harmonizes data from over 69 extant pregnancy and pediatric cohorts across the US. We used CWS estimates derived from the USEPA's Six-Year Review 3 (2006-2011) to develop population-weighted, average concentrations for 10 contaminants across 7640 ZCTAs relevant to the ECHO Cohort. We evaluated contaminant distributions, exceedances of regulatory thresholds, and geometric mean ratios (with corresponding percent changes) associated with ZCTA sociodemographic characteristics via spatial lag linear regression models. We observed significant regional variability in contaminant concentrations across the US. ZCTAs were most likely to exceed the maximum contaminant level for arsenic (n = 100, 1.4%) and the health-protective threshold for total trihalomethanes (n = 3584, 64.0%). A 10% higher proportion of residents who were American Indian/Alaskan Native and Hispanic/Latino was associated with higher arsenic (11%, 95% CI: 7%, 15%; and 2%, 95% CI: 0%, 3%, respectively) and uranium (15%, 95% CI: 10%, 21%; and 9%, 95% CI: 6%, 12%, respectively) concentrations. Nationwide epidemiologic analyses evaluating the association between US community water system contaminant concentration estimates and associated adverse birth outcomes in cohort studies are sparse because public water contaminant concentration estimates that can be readily linked to participant addresses are not available. We developed Zip Code Tabulation Area (ZCTA)-level CWS contaminant concentrations that can be linked to participants in the Environmental Influences on Child Health Outcomes (ECHO) Cohort and evaluated regional, seasonal, and sociodemographic inequities in contaminant concentrations for these ZCTAs. Future epidemiologic studies can leverage these CWS exposure estimates in the ECHO Cohort to evaluate associations with relevant infant outcomes.

Public Community Water System Expenditures Across the Downstate Region of Illinois

Public Community Water System Expenditures Across the Downstate Region of Illinois

Meso- and micro-plastics contamination of water, sediments and fish species in coastal communities of Ondo State, Nigeria

Small plastic particles are contaminants of increasing concern in the environment due to the dangers they pose to organisms and their potential to enter human food chain. Plastic pollution of Coastal environments is a threat to biodiversity of aquatic resources, and to the health and livelihood of Coastal inhabitants. In this study, microplastics and mesoplastics were jointly determined in the water, sediments and fish species from five coastal communities in Ondo State, Nigeria. The plastic particles ranged from 1430 to 2844 particles/L and 2497–4844 particles/kg in the coastal waters and sediments, respectively. Attenuated total reflectance– Fourier transform infrared (ATR – FTIR) spectroscopic analyses led to the identification of eight (8) plastic polymer types, with low density polyethylene (LDPE) and polypropylene (PP) jointly constituting 64 % of the plastic particles (0.5–25 mm). Microplastics were discovered in the gastro-intestinal tract (GIT) of every single individual of the four (4) species investigated. Clarias gariepinus had the highest concentration (13.3 ± 3.4 microplastics/individual) and showed tendency to accumulate microplastics as the fish size increased. Small plastic fibres were the most abundant shape in the coastal environment and in the fish species, pointing to the impact of artisanal fishing activities in the area. Detection of microplastics in all the fish species implies a risk of exposure to plastic particles by humans, who rely on these fishes for their protein source. Regulation of some single-use plastics (e.g. nylons, polybags and styrofoams) is proposed to curb the incidence of plastic particles in the Nigerian total environment.

Microbial Contamination of Surface Water and Groundwater in Flood-Impacted Rural Communities in South Texas Following Hurricane Hanna

Microbial Contamination of Surface Water and Groundwater in Flood-Impacted Rural Communities in South Texas Following Hurricane Hanna

Influence of monitoring and evaluation practices on the sustainability of donor-funded community water projects in Kismayu, Somalia

Influence of monitoring and evaluation practices on the sustainability of donor-funded community water projects in Kismayu, Somalia

Oral Health Care for Children and Youth With Developmental Disabilities: Clinical Report.

Oral health is an essential component of overall health for all individuals. The oral health of children and youth with developmental disabilities (CYDD) involves unique characteristics and needs of which pediatricians and pediatric clinicians can be aware. Risk for oral disease in CYDD is multifactorial and includes underlying medical conditions, medications, and ability to participate in preventive oral health care and treatment, and lack of access to providers is common for this population despite being eligible for Medicaid. Pediatric clinicians are uniquely positioned to support the oral health needs of CYDD and their families through the medical home. This clinical report aims to inform pediatric clinicians about the unique oral health needs of CYDD. It provides guidance on assessing caries risk and periodontal status using structured screening instruments; understanding dental trauma, the role of diet and caries risk, trauma prevention, and malocclusion; and providing anticipatory guidance on oral hygiene that includes tooth brushing, use of fluoridated toothpaste, assessing community water fluoridation, advocating for a dental home by 1 year of age, and transition to adult dental care as part of adolescent health care. It also highlights special considerations for dental treatment rendered under sedation or general anesthesia that CYDD may need. Pediatric clinicians can help reduce risk of CYDD developing dental disease by understanding the unique needs of their patients and their barriers to accessing oral health care in their community, communicating with the child's dental home, and advocating for safe and accessible dental procedures.