Decentralized　periodic　event-triggered　control　(DPETC)　is　a　method　that　allows　sensors　to　be　placed　flexibly　while　cutting　down　on　their　workload　and　the　amount　of　data　they　send　in　a　feedback　loop,　which　makes　it　a　good　fit　for　wireless　network　control　systems.　In　this　article,　we　investigate　the　control　issues　of　nonlinear　switched　systems　whose　switches　are　determined　by　the　system　input　and　consider　their　stability　by　designing　a　DPETC　scheme.　Additionally,　we　model　and　control　a　water　distribution　system　with　looped　pipe　network　using　a　switched　model　and　the　proposed　theory.　In　this　DPETC,　at　each　periodic　sampling　time,　the　local　event-triggered　mechanism　determines　events　by　assessing　whether　the　local　sampling　error　meets　the　predefined　triggering　condition.　If　so,　the　collected　sampling　data　will　be　transmitted　to　a　central　controller.　This　controller　processes　the　data　to　compute　the　control　input,　with　those　nodes　without　events　using　the　previous　updated　sampling　data.　Based　on　the　derived　control　input,　the　controller　then　switches　to　the　appropriate　mode　following　the　system＇s　switches.　The　feasibility　of　the　proposed　method　is　demonstrated　through　three　examples,　including　a　smart　water　distribution　system　with　looped　pipeline.