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Understanding mechanisms and drivers of this seawater intrusion (SWI) is key to mitigating its effects and predicting future vulnerability of groundwater resources to salinization. We implemented a monitoring network of pressure and specific conductivity (SC) sensors in wells and surface waters to target marsh\u2010adjacent agricultural areas in greater Dover, Delaware. Recorded water levels and SC over a period of three years show that the mechanisms and timescales of SWI are controlled by local hydrology, geomorphology, and geology. Monitored wells did not indicate widespread salinization of deep groundwater in the surficial aquifer. However, monitored surface water bodies and shallow (&lt;4\u2009m deep) wells did show SC fluctuations due to tides and storm events, in one case leading to salinization of deeper (18\u2009m deep) groundwater. Seasonal peaks in SC occurred during late summer months. Seasonal and interannual variation of SC was also influenced by relative sea level. The data collected in this study data highlight the mechanisms by which surface water\u2010groundwater connections lead to salinization of aquifers inland, before SWI is detected in deeper groundwater nearer the coastline. Sharing of our data with stakeholders has led to the implementation of SWI mitigation efforts, illustrating the importance of strategic monitoring and stakeholder engagement to support coastal resilience.<\/jats:p>","DOI":"10.1111\/gwat.13274","type":"journal-article","created":{"date-parts":[[2022,11,18]],"date-time":"2022-11-18T01:33:40Z","timestamp":1668735220000},"page":"626-638","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Surface Water\u2010Groundwater Connections as Pathways for Inland Salinization of Coastal Aquifers"],"prefix":"10.1111","volume":"61","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3600-003X","authenticated-orcid":false,"given":"Mary C.","family":"Hingst","sequence":"first","affiliation":[{"name":"Department of Earth Sciences University of Delaware  Newark DE USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3609-071X","authenticated-orcid":false,"given":"Rachel W.","family":"McQuiggan","sequence":"additional","affiliation":[{"name":"Delaware Geological Survey  Newark DE USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chelsea N.","family":"Peters","sequence":"additional","affiliation":[{"name":"Department of Environmental Studies Roanoke College  Salem VA USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Changming","family":"He","sequence":"additional","affiliation":[{"name":"Delaware Geological Survey  Newark DE USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A. 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