Leaflet-omnivore using topojson from CartoDB SQL API

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Leaflet Omnivore with CSV Data</title>

// omnivore will AJAX-request this file behind the scenes and parse it:
// note that there are considerations:
// - The CSV file must contain latitude and longitude values, in column
//   named roughly latitude and longitude
// - The file must either be on the same domain as the page that requests it,
//   or both the server it is requested from and the user's browser must
//   support CORS.
omnivore.topojson('https://geosprocket.cartodb.com/api/v2/sql?q=SELECT * from vttowns_wgs84&format=topojson').addTo(map);

var topPane = map._createPane('leaflet-top-pane', map.getPanes().mapPane);
    var topLayer = new L.mapbox.tileLayer('sactree.h7id69df', {
      maxZoom: 17,
      opacity: 0.8
    }).addTo(map);
    topPane.appendChild(topLayer.getContainer());
    topLayer.setZIndex(7);
</script>

</body>
</html>

https://api.tiles.mapbox.com/mapbox.js/v1.6.1/mapbox.js

https://api.tiles.mapbox.com/mapbox.js/plugins/leaflet-omnivore/v0.0.0/leaflet-omnivore.min.js