diff --git a/nomad/event_endpoint.go b/nomad/event_endpoint.go
index b04a0757ba8..97d0d978ed3 100644
--- a/nomad/event_endpoint.go
+++ b/nomad/event_endpoint.go
@@ -25,6 +25,7 @@ func (e *Event) register() {
 	e.srv.streamingRpcs.Register("Event.Stream", e.stream)
 }
 
+// ListSinks is used to list the event sinks registered in each namespace.
 func (e *Event) ListSinks(args *structs.EventSinkListRequest, reply *structs.EventSinkListResponse) error {
 	if done, err := e.srv.forward("Event.ListSinks", args, args, reply); done {
 		return err
@@ -77,6 +78,7 @@ func (e *Event) ListSinks(args *structs.EventSinkListRequest, reply *structs.Eve
 	return e.srv.blockingRPC(&opts)
 }
 
+// UpsertSink is used to create or update an event sink
 func (e *Event) UpsertSink(args *structs.EventSinkUpsertRequest, reply *structs.GenericResponse) error {
 	if done, err := e.srv.forward("Event.UpsertSink", args, args, reply); done {
 		return err
@@ -89,7 +91,9 @@ func (e *Event) UpsertSink(args *structs.EventSinkUpsertRequest, reply *structs.
 		return structs.ErrPermissionDenied
 	}
 
-	// TODO(drew) validate sink values
+	if err := args.Sink.Validate(); err != nil {
+		return err
+	}
 
 	// Update via Raft
 	_, index, err := e.srv.raftApply(structs.EventSinkUpsertRequestType, args)
@@ -101,6 +105,7 @@ func (e *Event) UpsertSink(args *structs.EventSinkUpsertRequest, reply *structs.
 	return nil
 }
 
+// GetSink returns the requested event sink
 func (e *Event) GetSink(args *structs.EventSinkSpecificRequest, reply *structs.EventSinkResponse) error {
 	if done, err := e.srv.forward("Event.GetSink", args, args, reply); done {
 		return err
@@ -141,6 +146,7 @@ func (e *Event) GetSink(args *structs.EventSinkSpecificRequest, reply *structs.E
 	return e.srv.blockingRPC(&opts)
 }
 
+// DeleteSink deletes an event sink
 func (e *Event) DeleteSink(args *structs.EventSinkDeleteRequest, reply *structs.GenericResponse) error {
 	if done, err := e.srv.forward("Event.DeleteSink", args, args, reply); done {
 		return err
diff --git a/nomad/event_endpoint_test.go b/nomad/event_endpoint_test.go
index 5202d03c0c4..9c36dc95ba4 100644
--- a/nomad/event_endpoint_test.go
+++ b/nomad/event_endpoint_test.go
@@ -543,6 +543,34 @@ func TestEvent_UpsertSink(t *testing.T) {
 	require.EqualValues(t, sink, out)
 }
 
+func TestEvent_UpsertSink_Invalid(t *testing.T) {
+	t.Parallel()
+
+	s1, cleanupS1 := TestServer(t, nil)
+	defer cleanupS1()
+
+	codec := rpcClient(t, s1)
+	testutil.WaitForLeader(t, s1.RPC)
+
+	sink := &structs.EventSink{
+		Type: structs.SinkWebhook,
+	}
+
+	req := &structs.EventSinkUpsertRequest{
+		Sink:         sink,
+		WriteRequest: structs.WriteRequest{Region: "global"},
+	}
+
+	var resp structs.GenericResponse
+	err := msgpackrpc.CallWithCodec(codec, "Event.UpsertSink", req, &resp)
+	require.Error(t, err)
+
+	require.Contains(t, err.Error(), "Missing sink ID")
+	require.Contains(t, err.Error(), "Sink must be in a namespace")
+	require.Contains(t, err.Error(), "Webhook sink requires a valid Address")
+
+}
+
 func TestEvent_GetSink(t *testing.T) {
 	t.Parallel()
 
diff --git a/nomad/structs/event.go b/nomad/structs/event.go
index 389bac9602a..e15e899b5ab 100644
--- a/nomad/structs/event.go
+++ b/nomad/structs/event.go
@@ -1,5 +1,13 @@
 package structs
 
+import (
+	"fmt"
+	"net/url"
+	"strings"
+
+	multierror "github.com/hashicorp/go-multierror"
+)
+
 // EventStreamRequest is used to stream events from a servers EventBroker
 type EventStreamRequest struct {
 	Topics map[Topic][]string
@@ -116,3 +124,32 @@ type EventSink struct {
 	CreateIndex uint64
 	ModifyIndex uint64
 }
+
+func (e *EventSink) Validate() error {
+	var mErr multierror.Error
+
+	if e.ID == "" {
+		mErr.Errors = append(mErr.Errors, fmt.Errorf("Missing sink ID"))
+	} else if strings.Contains(e.ID, " ") {
+		mErr.Errors = append(mErr.Errors, fmt.Errorf("Sink ID contains a space"))
+	} else if strings.Contains(e.ID, "\000") {
+		mErr.Errors = append(mErr.Errors, fmt.Errorf("Sink ID contains a null character"))
+	}
+
+	if e.Namespace == "" {
+		mErr.Errors = append(mErr.Errors, fmt.Errorf("Sink must be in a namespace"))
+	}
+
+	switch e.Type {
+	case SinkWebhook:
+		if e.Address == "" {
+			mErr.Errors = append(mErr.Errors, fmt.Errorf("Webhook sink requires a valid Address"))
+		} else if _, err := url.Parse(e.Address); err != nil {
+			mErr.Errors = append(mErr.Errors, fmt.Errorf("Webhook sink Address must be a valid url: %w", err))
+		}
+	default:
+		mErr.Errors = append(mErr.Errors, fmt.Errorf("Sink type invalid"))
+	}
+
+	return mErr.ErrorOrNil()
+}