The　South-to-North　Water　Diversion　(SNWD)　is　a　multi-decadal　infrastructure　project　in　China　aimed　at　alleviating　severe　water　shortages　in　north　China.　It　has　imposed　broad　social,　economic,　environmental,　and　ecological　impacts　since　2015,　particularly　in　the　Beijing-Tianjin　metropolitan　area.　Sentinel-1A/B　Interferometric　Synthetic　Aperture　Radar　(InSAR)　(2014-2021),　Global　Positioning　System　(GPS)　(2010-2021),　and　hydraulic-head　data　are　used　to　assess　the　impacts　on　ongoing　land　subsidence　in　Tianjin　in　this　study.　Additionally,　the　Principal　Component　Analysis　(PCA)　is　employed　to　highlight　primary　factors　controlling　the　recent　land　subsidence.　Our　results　show　that　the　reduced　groundwater　pumping　has　slowed　down　the　overall　subsidence　since　2019　due　to　SNWD.　As　of　2021,　the　subsiding　area　(＞5　mm/year)　has　reduced　to　about　5400　km(2),　approximately　85%　of　the　subsiding　area　before　SNWD;　the　areas　of　rapid　subsidence　(＞30　mm/year)　and　extremely　rapid　subsidence　(＞50　mm/year)　have　reduced　to　1300　km(2)　and　280　km(2),　respectively,　approximately　70%　and　60%　of　the　areas　before　SNWD.　Recent　subsidence　(2016-2021)　was　primarily　contributed　by　the　inelastic　compaction　of　clays　in　deep　aquifers　of　Aquifers　III　and　IV　ranging　from　approximately　200　to　450　m　below　the　land　surface.　The　ongoing　rapid　subsidence　(＞30　mm/year)　in　Tianjin　is　limited　to　border　areas　adjacent　to　large　industrial　cities　(e.g.,　Langfang,　Tanshan,　Cangzhou)　in　Hebei　Province.　Ongoing　subsidence　will　cease　when　hydraulic　heads　in　the　deep　Aquifers　(IV　and　V)　recover　to　the　new　pre-consolidation　head,　approximately　45　m　below　the　land　surface,　and　subsidence　will　not　be　reinitiated　as　long　as　the　hydraulic　heads　remain　above　the　new　pre-consolidation　head.　This　study　reveals　the　importance　of　coordinating　groundwater　and　surface　water　uses　at　local,　regional,　and　national　scales　for　land　subsidence　mitigation.