diff --git a/lib/tasks/data_cleanup.rake b/lib/tasks/data_cleanup.rake
index f84dfc0..ecab52e 100644
--- a/lib/tasks/data_cleanup.rake
+++ b/lib/tasks/data_cleanup.rake
@@ -36,8 +36,124 @@
     end
   end
 
+  desc "Check that each of the known type of invalidation is fixed."
+  task :find_known_invalidations => :environment do
+    ## Annotation
+
+    # Find with blank text
+    results = Annotation.where(text: [nil, ""])
+    report_known_invalidations(results, "Annotation", "text is blank")
+
+    # Find with duplicate type
+    results = Annotation.group(:question_id, :type, :org_id)
+                .count
+                .select { |k,v| v > 1 }
+    report_known_invalidations(results, "Annotation", "type is a duplicate")
+
+    ## Answer
+
+    # Fix blank user
+    results = Answer.joins("LEFT OUTER JOIN users ON users.id = answers.user_id")
+                    .where(users: { id: nil })
+                    .includes(plan: { roles: :user })
+    report_known_invalidations(results, "Answer", "user is blank")
+
+    # Fix duplicate question
+    results = Answer.group(:question_id, :plan_id).count.select { |k,v| v > 1 }
+    report_known_invalidations(results, "Answer", "question is a duplicate")
+
+    ## ExportedPlan
+
+    # Fix blank plan
+    results = ExportedPlan
+                .joins("LEFT OUTER JOIN plans on plans.id = exported_plans.plan_id")
+                .where(plans: { id: nil })
+    report_known_invalidations(results, "ExportedPlan", "plan is blank")
+
+    ## Org
+
+    # Fix blank abbreviation
+    results = Org.where(abbreviation: [nil, ""])
+    report_known_invalidations(results, "Org", "abbreviation is blank")
+
+    # Fix blank feedback_email_msg
+    results = Org.where(feedback_enabled: true, feedback_email_msg: [nil, ""])
+    report_known_invalidations(results, "Org", "feedback_email_msg is blank")
+
+    results = Org.where(feedback_enabled: true, feedback_email_subject: [nil, ""])
+    report_known_invalidations(results, "Org", "feedback_email_subject is blank")
+
+    results = Org.where(language: [nil, ""])
+    report_known_invalidations(results, "Org", "language is blank")
+
+    results = Org.where.not(contact_email: [nil, ""])
+                 .select { |o| o.contact_email !~ /[\w\d\.\-]+@[\w\d\.\-]/ }
+    report_known_invalidations(results, "Org", "contact_email is invalid")
+
+    ## Phase
+
+    # Fix duplicate number
+    results = Phase.group(:number, :template_id).count.select { |k,v| v > 1 }
+    report_known_invalidations(results, "Phase", "duplicate_number is invalid")
+
+    ## Plan
+
+    # Fix blank title
+    results = Plan.where(title: [nil, ''])
+    report_known_invalidations(results, "Plan", "title is blank")
+
+    ## Question
+
+    # Fix duplicate number
+    results = Question.group(:number, :section_id).count.select { |k,v| v > 1 }
+    report_known_invalidations(results, "Question", "number is duplicate")
+
+    ## QuestionFormat
+
+    # Fix blank description
+    results = QuestionFormat.where(description: ["", nil])
+    report_known_invalidations(results, "QuestionFormat", "description is blank")
+
+    ## Region
+
+    # Fix blank description
+    results = Region.where(description: ["", nil])
+    report_known_invalidations(results, "Region", "description is blank")
+
+    ## Role
+
+    # Fix blank plan
+    results = Role.joins("LEFT OUTER JOIN plans ON plans.id = roles.plan_id")
+                  .where(plans: { id: nil })
+    report_known_invalidations(results, "Role", "plan is blank")
+
+    ## Section
+
+    # Fix duplicate number
+    results = Section.group(:number, :phase_id).count.select { |k,v| v > 1 }
+    report_known_invalidations(results, "Section", "number is duplicate")
+
+    ## Template
+
+    # Fix blank locale
+    results = Template.where(locale: [nil, ""])
+    report_known_invalidations(results, "Template", "locale is blank")
+
+    ## UserIdentifier
+
+    # Fix blank user
+    results = UserIdentifier
+                .joins("LEFT OUTER JOIN users ON users.id = user_identifiers.user_id")
+                .where(users: { id: nil })
+    report_known_invalidations(results, "UserIdentifier", "user is blank")
+  end
+
   private
 
+  def report_known_invalidations(results, model_name, validation_error)
+    DataCleanup.display "#{results.count} #{model_name.pluralize} with #{validation_error}", color: results.any? ? :red : :green
+  end
+
   def rule_paths
     @rule_paths ||= Rails.root.join("lib", "data_cleanup", "rules", "*", "*.rb")
   end