2019 No https://doi.org/10.1111/josh.12873 Patel, Anisha I. North America Experimental Observational Staff Elementary (K-5) Middle/Jr High (6-8) High School (9-12) Water quality Other Nutrition and diet School health policy Public health Water access Water at school Photo evidence Researchers validated a photo-evidence tool by comparing direct observations with coded photos of 200 school water sources. Strong agreement was found for most quality indicators. Supports scalable water access assessments.