Hi Chris - I'm not sure which map you're talking about (I have never seen the igems url before, and the DEC link is not one that I knew about), but we have one of all volcanoes (not just active): https://avo.alaska.edu/geoserver/AVO/wms?service=WMS&version=1.1.0&request=GetMap&layers=AVO:volcano&styles=&bbox=-179.035995483398,51.716064453125,-130.088684082031,66.4221038818359&width=768&height=330&srs=EPSG:4269&format=application/openlayers We also have this publication of historically active volcanoes (you can download the shapefiles): http://dggs.alaska.gov/pubs/id/20181 and the Smithsonian Global Volcanism Program maintains a KML layer of all Holocene volcanoes, worldwide. Hope these are helpful, Cheryl -------- Chris Miller wrote: we used to access a web map service for active volcanoes and displayed the service on a map of public water systems. Your site has a lot of good data but I don't see and URL's to access authoritative data into our public drinking water web maps. Here's the URL that DEC-Drinking Water Program used to access. https://igems.doi.gov/arcgis/rest/services/igems_haz/MapServer/1 Any chance you have a public web servic we can use? Here is the URL to the web map with a dead link to the active volcanoes. https://adec.maps.arcgis.com/home/webmap/viewer.html?webmap=18ea7e2b9c104c76... -_Chris -- Cheryl Cameron Geologist, Alaska Volcano Observatory Alaska Division of Geological & Geophysical Surveys voice: 907-451-5012 fax: 907-451-5050