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Event Description: EPA funded Medium Scale research project: 2013-W-MS-14: Assessment of natural organic matter (NOM) and ptaquiloside in Irish waters will host a Natural Organic Matter & Trihalomethanes, Overview Disinfection by-products (DBPs) are formed when natural water is treated to control microbial presence during the drinking water treatment process and can comprise halogenated and non-halogenated compounds depending on the nature of disinfectants used and precursors present. Trihalomethanes (THMs) are the most eminent class of DBPs in treated water; however, more than 600 different DBPs have been acknowledged. THMs are formed when chlorine re-acts with aromatic structures in humic substances. Ireland has the highest reported non-compliance for THM exceed-ances across the 27 EU Member States and at least two-fold greater than the next highest Member State. The objectives of the proposed workshop will be to share a summary of international and national research from scien-tists in relation to natural organic matter (NOM) and DBPs; define the problems water managers are faced with in rela-tion to NOM and DBPs; agree on defined research questions for further study; and to establish an Irish NOM network. Workshop themes: • Policies and regulations on THMs • National and International catchment based research findings on dissolved organic carbon (DOC) leaching • Problems faced by water managers and the technologies available for NOM removal • Methods of analysis for NOM and DBPs Who should attend? Attendance of water managers, scientists, engineers, industry partners, environmental managers, heritage officers, planning officers, policymakers, and students is strongly encouraged.