Physicochemical and bacteriological analysis of drinking water in public schools of Tarlac City, Central Luzon, Philippines

Keywords: drinking water, total coliform, Escherichia coli, fecal coliform, color, pH, chloride, sulfate, total dissolved solids, turbidity


This study analyzed drinking water in selected public schools in Tarlac City in terms of physicochemical properties and bacterial content. Bottled water, water from dispensers and tap water from faucets were taken for analyses. Seven schools were included in the study which is comprised of 5 public elementary schools, 1 secondary school and 1 tertiary school. These schools were selected because of the high population of students enrolled and being located along busy streets in the city. Findings revealed that of the 21 samples, two registered abnormal color (30 apparent platinum-cobalt unit for both) and high total dissolved solids (>500mg/mL). Moreover, 11 samples out of 21  had shown total coliform and fecal coliform >8 MPN/100mL;  5 samples positive with E. coli;  and  5 samples with very high HPC (>4000 CFU/mL). The study concluded that some of the water samples are unfit for drinking unless they are boiled. The study recommended that schools voluntarily conduct regular testing of water to ensure safe water for the students. DOH may also conduct random unscheduled water testing to validate voluntary water testing in the schools. Investigation of the incidents of water-borne diseases among the school stakeholders may be carried out in schools found to have positive results to analyze health impact.

Author Biographies

Alma M. Corpuz, College of Science, Tarlac State University





Alma M. Corpuz earned a Doctorate Degree in educational management in Tarlac State University. She also finished a Master’s Degree in General Education in 1994. She is a registered medical technologist and a licensed teacher.

Dr. Corpuz is the Vice president of the Philippine Association of Medical Technologists, Tarlac Chapter. She is also the secretary of the Philippine Association of Women Professors , Tarlac Chapter. She is a member of various academic and professional organizations to include National Organization of Science Teachers and Educators (NOSTE, Inc.) Phi Lambda Theta International Organization for Doctors.

Dr. Corpuz is the adviser of Philippine Science Consortium (PSC) Student Chapter of TSU and the Environmental Science Society. She is also the member-secretary of the TSU-Research Ethics Review Committee.

Dr. Corpuz has presented researches in local, regional, national and international conferences. She has also published in reputable journals. Her recent publication is at the INTERNATIONAL REVIEW OF HUMANITIES AND SCIENTIFIC RESEARCH By International Scientific Indexing ISSN (Online) : 2519-5336 with the study entitled “ Cases of HIV/ AIDS in Tarlac Province, Central Luzon, Philippines from 1984 to 2016 and the Knowledge and Risky Behaviors of Various Gender Groups.”

Dr. Corpuz is also active in community outreach. She is the chair of Pioneer Project REACH , a non-Government organization that assists the needs of indigent communities in matters of health and environment.

Nancy L. Mati, College of Science, Tarlac State University


Nancy L. Mati is born on July 31, 1969 at Tarlac, Tarlac. Graduated in 1989 with the degree of Bachelor of Science in Mathematics at Saint Louis University, Baguio; Master of Arts in Teaching Mathematics in 2008 at Tarlac State University, Tarlac City, and has earned units in the Ed.D degree major in Educational Management at Tarlac State University (dissertation writing).

   She is currently the Chairperson of the Mathematics Department, College of Science at Tarlac State University.

Erwin C. Mina, College of Science, Tarlac State University



Erwin C. Mina is born on March 9, 1972 at Caarosipan Palimbo, Camiling, Tarlac. Graduated in 1993 with the degree of Bachelor of Science in chemistry at Central Luzon State University, Science City of Munoz, Nueva Ecija; Master of Arts in teaching mathematics in 1997 at Tarlac State University, Tarlac City, Tarlac; Ph.D. major in science education at Virgen Milagrosa University Foundation (academic requirements), San Carlos City, Pangasinan;.Master of Science in chemistry (Candidate 2018) major in organic chemistry (natural products) at University of Santo Tomas, Sampaloc, Manila.

He is currently an Associate Professor V at the College of Science, Tarlac State University. He was an Instructor from August 1993 – October 2001, Assistant Professor from November 2001 – December 2015, Associate Professor II from January 2015 – November 30, 2016 at the Tarlac State University teaching natural sciences subjects such as general chemistry, organic chemistry laboratory, environmental chemistry, chemistry of natural products, environmental science and physical science. Likely, he was a Chairperson of the Analytical Services Laboratory and Natural Products Research Center, Tarlac State University and Chairperson of the College Department for Research and Development, College of Science, Tarlac State University. The following are the research articles published: Ethnobotanical Survey of Plants Commonly used for Diabetes in Tarlac of Central Luzon Philippines. International Medical Journal Malaysia, 2017; Larvicidal Potential of Ethanolic Extracts of Centrosema pubescens Benth. BMJ Open 2015 Supplemental 5; Chemical and Anti-tubercular Screening on the Leaves of Jatropha multifida Linn. International Journal on Pure and Applied Biology, 2013.Currently completing the structure elucidation of natural products from indigenous plant for the inhibition of mycobacterium tuberculosis. Nevertheless, he is indeed interested in topics of environment health and natural products from plants and animals for health and wellness

Associate Professor Mina is a member of professional societies like The Philippine Association of Chemistry Teachers, Organic Chemistry Teachers’ Association, Philippine Environmental Mutagens Society, Inc., Natural Products society of the Philippines, OHSEC Institution of Fire and Safety Practitioners, Samahan ng mga Edukador sa Pilipinas and Philippine Association of Extension Program Implementors, Inc.


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How to Cite
Corpuz, A. M., Mati, N. L., & Mina, E. C. (2016). Physicochemical and bacteriological analysis of drinking water in public schools of Tarlac City, Central Luzon, Philippines. University of the Visayas - Journal of Research, 10(1), 7-14. Retrieved from