diff --git a/app/models/form_field.rb b/app/models/form_field.rb
index cc6b39187..6d1f37fff 100644
--- a/app/models/form_field.rb
+++ b/app/models/form_field.rb
@@ -15,17 +15,13 @@ class FormField < ApplicationRecord
   # "required" flag is meaningless for them (nothing to fill in).
   NON_INPUT_ANSWER_TYPES = %w[no_user_input group_header].freeze
 
-  # Multi-select "additional sectors" field identifiers. "additional_sectors" is
-  # the canonical name new forms are built with; the older "primary_sector" name
-  # (a misnomer — it was always the multi-select additional field) and the legacy
-  # "service area" name are both still accepted so existing form data keeps
-  # resolving.
-  ADDITIONAL_SECTOR_FIELD_IDENTIFIERS = %w[additional_sectors primary_sector primary_service_area].freeze
-
-  # Single-select "primary sector" field identifiers (current + legacy). Unlike
-  # the multi-select "additional" field, these omit the catch-all "Other" sector
-  # — a respondent's primary sector must be a concrete sector.
-  PRIMARY_SECTOR_FIELD_IDENTIFIERS = %w[primary_sector_single primary_service_area_single].freeze
+  # Multi-select "additional sectors" field identifier.
+  ADDITIONAL_SECTOR_FIELD_IDENTIFIERS = %w[additional_sectors].freeze
+
+  # Single-select "primary sector" field identifier. Unlike the multi-select
+  # "additional" field, it omits the catch-all "Other" sector — a respondent's
+  # primary sector must be a concrete sector.
+  PRIMARY_SECTOR_FIELD_IDENTIFIERS = %w[primary_sector].freeze
 
   # Field identifiers whose selectable options are sourced dynamically from
   # Sector records rather than the field's own stored answer options. The
@@ -91,7 +87,7 @@ class FormField < ApplicationRecord
   # Keeps an over-long name as a friendly validation error instead of a
   # database ValueTooLong exception (the column is text, this is the UX cap).
   validates :name, length: { maximum: 1000 }
-  # A field_identifier wires a field to backend logic (Stripe, service areas,
+  # A field_identifier wires a field to backend logic (Stripe, sectors,
   # email checks, etc.), so the same identifier must not appear twice on one form
   # or that logic would target an ambiguous field. Ordinary fields carry no
   # identifier, so blanks are exempt — any number of them may coexist.
diff --git a/app/services/form_builder_service.rb b/app/services/form_builder_service.rb
index 2d72897d9..ea757612f 100644
--- a/app/services/form_builder_service.rb
+++ b/app/services/form_builder_service.rb
@@ -50,7 +50,7 @@ def call
       agency_street agency_city agency_state agency_zip agency_country
     ],
     person_background: %w[racial_ethnic_identity],
-    professional_info: %w[primary_sector_single additional_sectors primary_age_group additional_age_group],
+    professional_info: %w[primary_sector additional_sectors primary_age_group additional_age_group],
     marketing: %w[referral_source training_motivation interested_in_more],
     continuing_education: %w[ce_credit_interest ce_license_number],
     scholarship: %w[scholarship_eligibility scholarship_contribution impact_description implementation_plan additional_comments],
@@ -455,7 +455,7 @@ def build_professional_info_fields(form, position)
     position = add_header(form, position, "Professional Information", group: "professional")
 
     position = add_field(form, position, "Primary sector", :single_select_dropdown,
-                         key: "primary_sector_single", group: "professional", required: false,
+                         key: "primary_sector", group: "professional", required: false,
                          subtitle: "Select the option that best represents those you primarily intend to serve through the art workshops")
     position = add_field(form, position, "Additional sectors", :multi_select_checkbox,
                          key: "additional_sectors", group: "professional", required: false,
diff --git a/app/services/smart_form_fields.rb b/app/services/smart_form_fields.rb
index 024b1ba97..15209d28b 100644
--- a/app/services/smart_form_fields.rb
+++ b/app/services/smart_form_fields.rb
@@ -108,13 +108,10 @@ class SmartFormFields
                "records rather than from options typed into the form editor. The tags are applied to " \
                "the registrant and to their linked organization.",
       fields: [
-        [ "primary_sector_single", "Primary sector", "Tags the person and organization with one primary sector. Offers no \"Other\" — a primary sector must be a real sector." ],
+        [ "primary_sector", "Primary sector", "Tags the person and organization with one primary sector. Offers no \"Other\" — a primary sector must be a real sector." ],
         [ "additional_sectors", "Additional sectors", "Tags the person and organization with any number of additional sectors. An \"Other\" answer goes to the Other responses review queue, where it can be promoted into a real sector." ],
         [ "primary_age_group", "Primary age group(s) served", "Tags the person and organization with the primary age range served." ],
-        [ "additional_age_group", "Additional age group(s) served", "Tags the person and organization with additional age ranges served." ],
-        [ "primary_sector", "Additional sectors (legacy)", "Older name for the additional sectors question. Still honored so existing forms keep working; use additional_sectors on new forms." ],
-        [ "primary_service_area", "Additional sectors (legacy)", "Older name for the additional sectors question. Still honored; use additional_sectors on new forms." ],
-        [ "primary_service_area_single", "Primary sector (legacy)", "Older name for the primary sector question. Still honored; use primary_sector_single on new forms." ]
+        [ "additional_age_group", "Additional age group(s) served", "Tags the person and organization with additional age ranges served." ]
       ]
     },
     {
diff --git a/app/views/events/public_registrations/_form_field.html.erb b/app/views/events/public_registrations/_form_field.html.erb
index d71ac5279..755ce7473 100644
--- a/app/views/events/public_registrations/_form_field.html.erb
+++ b/app/views/events/public_registrations/_form_field.html.erb
@@ -114,7 +114,7 @@
     <% end %>
 
   <% when "single_select_dropdown" %>
-    <%# Dynamic fields (e.g. primary_sector_single) source options from
+    <%# Dynamic fields (e.g. primary_sector) source options from
         Sector/Category data; everything else uses the field's own stored options. %>
     <%# Dropdowns have no free-text input, so the "Other" option is omitted here.
         Named specify options keep meaning as a bare choice, so they stay. %>
diff --git a/app/views/forms/_form_field_fields.html.erb b/app/views/forms/_form_field_fields.html.erb
index 82990b1c9..f8679d332 100644
--- a/app/views/forms/_form_field_fields.html.erb
+++ b/app/views/forms/_form_field_fields.html.erb
@@ -151,7 +151,7 @@
                 class: "w-24 shrink-0 rounded border-gray-300 shadow-sm px-2 py-1 text-sm",
                 title: "Maximum number of characters allowed (free-form text fields only)" %>
           <%# Smart field name + Remove stay pinned together so Remove never lands on its own
-              line. The name wires this field to backend logic (Stripe, service areas, email
+              line. The name wires this field to backend logic (Stripe, sectors, email
               checks, etc.); most fields need none, and the linked hint explains each one. %>
           <div class="flex shrink-0 items-center gap-2">
             <div class="flex flex-col shrink-0">
diff --git a/db/seeds/dev/events_management.rb b/db/seeds/dev/events_management.rb
index d957e4e7e..725d2f601 100644
--- a/db/seeds/dev/events_management.rb
+++ b/db/seeds/dev/events_management.rb
@@ -1185,7 +1185,7 @@
 
   # Mirror the registration form's two sector fields: the single-select primary
   # sector dropdown and the multi-select additional sectors checkboxes.
-  primary_field = form.form_fields.find_by(field_identifier: "primary_sector_single")
+  primary_field = form.form_fields.find_by(field_identifier: "primary_sector")
   if primary_field && primary_sector && submission.form_answers.where(form_field: primary_field).none?
     submission.form_answers.create!(form_field: primary_field,
                                     submitted_answer: primary_sector.id.to_s,
diff --git a/db/seeds/dev/legacy_form_identifiers.rb b/db/seeds/dev/legacy_form_identifiers.rb
deleted file mode 100644
index 222d29997..000000000
--- a/db/seeds/dev/legacy_form_identifiers.rb
+++ /dev/null
@@ -1,96 +0,0 @@
-# Legacy field-identifier registration forms (dev-only).
-#
-# The four professional questions — primary/additional sector and
-# primary/additional age group — resolve their options dynamically from Sector /
-# AgeRange records, and the code still accepts several *legacy* field_identifiers
-# for the sector fields so older forms keep working (see
-# FormField::PRIMARY_SECTOR_FIELD_IDENTIFIERS / ADDITIONAL_SECTOR_FIELD_IDENTIFIERS).
-# The canonical combination already ships as "Training Registration Form"; these
-# extra standalone forms each carry a different legacy combination, with a demo
-# registrant + submission + tags, so every surface (form rendering, the form
-# submission show, and the registrant's profile/edit pages) can be eyeballed on
-# real data for every identifier scheme.
-#
-# Loaded last in the dev seed order so its extra role: "registration" forms can't
-# shadow the canonical one that events_management.rb / scholarships.rb look up via
-# `Form.standalone.find_by(role: "registration")`. Idempotent throughout.
-
-puts "Creating legacy field-identifier registration forms…"
-
-# The dynamic option pools, mirroring the canonical lists. The single-select
-# primary sector field omits the catch-all "Other"; the additional sector field
-# keeps it (offered as a folded "Other: <text>"). Age groups have no catch-all.
-concrete_sectors = Sector.published.excluding_other.order(:name).to_a
-other_sector = Sector.published.find_by(name: Sector::OTHER_SECTOR_NAME)
-age_categories = Category.age_ranges.published.order(:position, :name).to_a
-
-# Each scheme renames the two canonical sector fields onto a legacy combination.
-# The age-group fields have never been renamed, so they stay canonical.
-legacy_schemes = [
-  { suffix: "legacy service area",
-    primary_sector: "primary_service_area_single", additional_sector: "primary_service_area",
-    first_name: "Lee", last_name: "Servicearea", email: "legacy.servicearea@example.com" },
-  { suffix: "legacy additional name",
-    primary_sector: "primary_sector_single", additional_sector: "primary_sector",
-    first_name: "Morgan", last_name: "Additionalname", email: "legacy.additional@example.com" },
-  { suffix: "legacy mixed",
-    primary_sector: "primary_service_area_single", additional_sector: "additional_sectors",
-    first_name: "Rae", last_name: "Mixedscheme", email: "legacy.mixed@example.com" }
-]
-
-legacy_schemes.each_with_index do |scheme, i|
-  form_name = "Training Registration Form (#{scheme[:suffix]})"
-
-  form = Form.standalone.find_by(name: form_name)
-  unless form
-    form = FormBuilderService.new(
-      name: form_name,
-      sections: %i[person_identifier professional_info],
-      role: "registration"
-    ).call
-    { "primary_sector_single" => scheme[:primary_sector],
-      "additional_sectors" => scheme[:additional_sector] }.each do |canonical, legacy|
-      next if canonical == legacy
-      form.form_fields.find_by(field_identifier: canonical)&.update!(field_identifier: legacy)
-    end
-  end
-
-  # A demo registrant whose submission + tags back the form, so the profile and
-  # submission pages have data to render for this scheme.
-  person = Person.find_or_create_by!(email: scheme[:email]) do |p|
-    p.first_name = scheme[:first_name]
-    p.last_name = scheme[:last_name]
-  end
-
-  submission = FormSubmission.find_or_create_by!(form: form, person: person, role: "registration")
-
-  primary_sector = concrete_sectors[i % concrete_sectors.size] if concrete_sectors.any?
-  additional_sectors = concrete_sectors.rotate(i + 1).reject { |sector| sector == primary_sector }.first(2)
-  primary_age = age_categories[i % age_categories.size] if age_categories.any?
-  additional_ages = age_categories.rotate(i + 1).reject { |age| age == primary_age }.first(2)
-
-  # Mirror how public registration stores the answers: a single id for the
-  # dropdowns, ", "-joined ids for the checkboxes, and a folded "Other: <text>" for
-  # the additional sectors so the free-text path is represented too.
-  additional_sector_value = (additional_sectors.map(&:id) +
-    [ ("Other: Equine-assisted therapy" if other_sector) ].compact).join(", ")
-  {
-    scheme[:primary_sector] => primary_sector&.id&.to_s,
-    scheme[:additional_sector] => additional_sector_value.presence,
-    "primary_age_group" => primary_age&.id&.to_s,
-    "additional_age_group" => additional_ages.map(&:id).join(", ").presence
-  }.each do |identifier, value|
-    next if value.blank?
-    field = form.form_fields.find_by(field_identifier: identifier)
-    next unless field
-    next if submission.form_answers.where(form_field: field).any?
-    submission.form_answers.create!(form_field: field,
-                                    submitted_answer: value,
-                                    question_name_when_answered: field.name)
-  end
-
-  # Tag the registrant with the same primary/additional split assign_tags applies,
-  # so the profile/edit pages crown the right primary and list the additional ones.
-  person.tag_sectors(primary_ids: [ primary_sector&.id ].compact, additional_ids: additional_sectors.map(&:id))
-  person.tag_age_groups(primary_ids: [ primary_age&.id ].compact, additional_ids: additional_ages.map(&:id))
-end
diff --git a/lib/tasks/dev.rake b/lib/tasks/dev.rake
index 3da230837..4c3a81647 100644
--- a/lib/tasks/dev.rake
+++ b/lib/tasks/dev.rake
@@ -23,7 +23,6 @@ namespace :db do
       scholarships
       membership
       bulk_payments
-      legacy_form_identifiers
       public_forms
     ]
 
@@ -125,11 +124,6 @@ namespace :db do
       load Rails.root.join("db/seeds/dev/bulk_payments.rb")
     end
 
-    desc "Seed registration forms using legacy professional-field identifiers (dev only)"
-    task legacy_form_identifiers: :environment do
-      load Rails.root.join("db/seeds/dev/legacy_form_identifiers.rb")
-    end
-
     desc "Seed standalone public forms with submissions and answers (dev only)"
     task public_forms: :environment do
       load Rails.root.join("db/seeds/dev/public_forms.rb")
diff --git a/spec/helpers/application_helper_spec.rb b/spec/helpers/application_helper_spec.rb
index 33de9324c..9172011f5 100644
--- a/spec/helpers/application_helper_spec.rb
+++ b/spec/helpers/application_helper_spec.rb
@@ -587,19 +587,19 @@
   describe "#dynamic_form_field_options" do
     let(:form) { create(:form) }
 
-    it "omits the Other sector for the primary service-area dropdown" do
+    it "omits the Other sector for the primary sector dropdown" do
       create(:sector, :published, name: "Domestic Violence")
       create(:sector, :published, name: "Other")
-      field = create(:form_field, form: form, answer_type: :single_select_dropdown, field_identifier: "primary_service_area_single")
+      field = create(:form_field, form: form, answer_type: :single_select_dropdown, field_identifier: "primary_sector")
 
       labels = helper.dynamic_form_field_options(field).map(&:first)
       expect(labels).to include("Domestic Violence")
       expect(labels).not_to include("Other")
     end
 
-    it "includes the Other sector for the additional service-areas field" do
+    it "includes the Other sector for the additional sectors field" do
       create(:sector, :published, name: "Other")
-      field = create(:form_field, form: form, answer_type: :multi_select_checkbox, field_identifier: "primary_service_area")
+      field = create(:form_field, form: form, answer_type: :multi_select_checkbox, field_identifier: "additional_sectors")
 
       labels = helper.dynamic_form_field_options(field).map(&:first)
       expect(labels).to include("Other")
@@ -608,7 +608,7 @@
     it "carries each sector's description as the third tuple element" do
       create(:sector, :published, name: "Domestic Violence", description: "DV services")
       create(:sector, :published, name: "Mental Health", description: nil)
-      field = create(:form_field, form: form, answer_type: :multi_select_checkbox, field_identifier: "primary_service_area")
+      field = create(:form_field, form: form, answer_type: :multi_select_checkbox, field_identifier: "additional_sectors")
 
       descriptions = helper.dynamic_form_field_options(field).to_h { |name, _id, desc| [ name, desc ] }
       expect(descriptions["Domestic Violence"]).to eq("DV services")
diff --git a/spec/models/form_field_spec.rb b/spec/models/form_field_spec.rb
index 2bdda3064..8749919ff 100644
--- a/spec/models/form_field_spec.rb
+++ b/spec/models/form_field_spec.rb
@@ -441,8 +441,8 @@ def selectable_field(type:, option_names:)
     end
 
     context "with dynamically-sourced options" do
-      it "accepts a published Sector id and rejects others for a service-area field" do
-        field = create(:form_field, form: form, answer_type: :single_select_dropdown, field_identifier: "primary_service_area_single")
+      it "accepts a published Sector id and rejects others for a primary sector field" do
+        field = create(:form_field, form: form, answer_type: :single_select_dropdown, field_identifier: "primary_sector")
         offered = create(:sector, :published)
         unpublished = create(:sector, :unpublished)
 
@@ -451,22 +451,13 @@ def selectable_field(type:, option_names:)
         expect(field.answer_inclusion_error("999999")).to eq("has an invalid selection")
       end
 
-      # The canonical identifiers, the legacy "primary_sector" additional name,
-      # and the legacy "service area" names must all behave identically so
-      # existing form data keeps resolving.
-      {
-        "sector" => %w[primary_sector_single additional_sectors],
-        "sector (legacy additional name)" => %w[primary_sector_single primary_sector],
-        "service area (legacy)" => %w[primary_service_area_single primary_service_area]
-      }.each do |scheme, (primary_id, additional_id)|
-        it "rejects the Other sector for the primary #{scheme} field but accepts it for additional" do
-          other = create(:sector, :published, name: "Other")
-          primary = create(:form_field, form: form, answer_type: :single_select_dropdown, field_identifier: primary_id)
-          additional = create(:form_field, form: form, answer_type: :multi_select_checkbox, field_identifier: additional_id)
-
-          expect(primary.answer_inclusion_error(other.id.to_s)).to eq("has an invalid selection")
-          expect(additional.answer_inclusion_error([ other.id.to_s ])).to be_nil
-        end
+      it "rejects the Other sector for the primary sector field but accepts it for additional" do
+        other = create(:sector, :published, name: "Other")
+        primary = create(:form_field, form: form, answer_type: :single_select_dropdown, field_identifier: "primary_sector")
+        additional = create(:form_field, form: form, answer_type: :multi_select_checkbox, field_identifier: "additional_sectors")
+
+        expect(primary.answer_inclusion_error(other.id.to_s)).to eq("has an invalid selection")
+        expect(additional.answer_inclusion_error([ other.id.to_s ])).to be_nil
       end
 
       it "accepts a published Category id from the backing type for a category field" do
@@ -498,7 +489,7 @@ def selectable_field(type:, option_names:)
         create(:sector, :published, name: "Other")
         mental_health = create(:sector, :published, name: "Mental Health")
         additional = create(:form_field, form: form, answer_type: :multi_select_checkbox, field_identifier: "additional_sectors")
-        primary = create(:form_field, form: form, answer_type: :single_select_dropdown, field_identifier: "primary_sector_single")
+        primary = create(:form_field, form: form, answer_type: :single_select_dropdown, field_identifier: "primary_sector")
 
         # The "Other" Sector renders a free-text box on the additional checkboxes,
         # which submits the folded "Other: <text>" (or a bare "Other"); both pass.
diff --git a/spec/models/person_spec.rb b/spec/models/person_spec.rb
index d0dd1d4f2..1ac398e8c 100644
--- a/spec/models/person_spec.rb
+++ b/spec/models/person_spec.rb
@@ -596,8 +596,8 @@ def answer(identifier, value)
           .to contain_exactly("Toddlers")
       end
 
-      it "does not pull from the service area fields" do
-        answer("primary_service_area", "Other: Equine therapy")
+      it "does not pull from the sector fields" do
+        answer("additional_sectors", "Other: Equine therapy")
 
         expect(person.other_workshop_setting_responses).to be_empty
       end
diff --git a/spec/requests/events/professional_field_identifiers_spec.rb b/spec/requests/events/professional_field_identifiers_spec.rb
index 47dab03b1..5af5d3e5c 100644
--- a/spec/requests/events/professional_field_identifiers_spec.rb
+++ b/spec/requests/events/professional_field_identifiers_spec.rb
@@ -2,8 +2,7 @@
 
 # The four professional registration questions (primary/additional sector and
 # primary/additional age group) resolve their options dynamically from Sector /
-# AgeRange records and must keep working across every legacy field_identifier a
-# form might still carry. For each identifier scheme this exercises, end to end:
+# AgeRange records. This exercises the canonical field_identifiers end to end:
 #
 #   * option rendering — the primary sector field is a dropdown of the published
 #     sectors minus the catch-all "Other"; the additional sector field keeps
@@ -29,12 +28,8 @@
   let!(:sector_other)     { create(:sector, :published, name: Sector::OTHER_SECTOR_NAME) }
   let!(:sector_hidden)    { create(:sector, name: "Hidden sector") }
 
-  # Each scheme maps the two sector fields onto a canonical or legacy identifier;
-  # the age-group fields have never been renamed, so they stay constant.
   {
-    "canonical identifiers"         => { primary_sector: "primary_sector_single",       additional_sector: "additional_sectors" },
-    "legacy additional-sector name" => { primary_sector: "primary_sector_single",       additional_sector: "primary_sector" },
-    "legacy service-area names"     => { primary_sector: "primary_service_area_single", additional_sector: "primary_service_area" }
+    "canonical identifiers" => { primary_sector: "primary_sector", additional_sector: "additional_sectors" }
   }.each do |scheme_name, ids|
     context "with #{scheme_name}" do
       let(:form) { build_professional_form(ids) }
@@ -149,16 +144,14 @@
 
   # ---- Form construction ----
 
-  # Builds a registration form with just the identity + professional sections,
-  # then renames the two sector fields onto the scheme's identifiers (the age
-  # fields keep their canonical names — they were never renamed).
+  # Builds a registration form with just the identity + professional sections.
   def build_professional_form(ids)
     form = FormBuilderService.new(
       name: "Reg #{ids[:primary_sector]} / #{ids[:additional_sector]}",
       sections: %i[person_identifier professional_info],
       role: "registration"
     ).call
-    rename_field(form, "primary_sector_single", ids[:primary_sector])
+    rename_field(form, "primary_sector", ids[:primary_sector])
     rename_field(form, "additional_sectors", ids[:additional_sector])
     form
   end
diff --git a/spec/requests/events/public_registrations_spec.rb b/spec/requests/events/public_registrations_spec.rb
index 19e09c3aa..cf5bce0d5 100644
--- a/spec/requests/events/public_registrations_spec.rb
+++ b/spec/requests/events/public_registrations_spec.rb
@@ -386,14 +386,14 @@ def post_with_scholarship(scholarship_answer)
     end
 
     it "renders a dynamic-option field switched to single choice as radio buttons" do
-      # primary_service_area sources its options dynamically from Sector
+      # additional_sectors sources its options dynamically from Sector
       # (it stores no answer options of its own). When such a field is changed
       # from checkbox to single-choice radio, the public form must still render
       # the dynamic options — otherwise the question shows up blank.
       sector_a = create(:sector, :published, name: "Healthcare")
       sector_b = create(:sector, :published, name: "Education")
       create(:form_field, form: form, answer_type: :single_select_radio,
-             field_identifier: "primary_service_area", name: "Primary sector",
+             field_identifier: "additional_sectors", name: "Additional sectors",
              required: false)
 
       get new_event_public_registration_path(event)
@@ -407,7 +407,7 @@ def post_with_scholarship(scholarship_answer)
     it "still renders a dynamic-option field as checkboxes" do
       create(:sector, :published, name: "Healthcare")
       create(:form_field, form: form, answer_type: :multi_select_checkbox,
-             field_identifier: "primary_service_area", name: "Primary sector",
+             field_identifier: "additional_sectors", name: "Additional sectors",
              required: false)
 
       get new_event_public_registration_path(event)
diff --git a/spec/requests/events_spec.rb b/spec/requests/events_spec.rb
index da20cbece..445002cda 100644
--- a/spec/requests/events_spec.rb
+++ b/spec/requests/events_spec.rb
@@ -2848,7 +2848,7 @@ def ce_chip_text
           submission = create(:form_submission, person: person, form: registration_form)
 
           sector = create(:sector, name: "Sexual Assault")
-          sector_field = create(:form_field, form: registration_form, field_identifier: "primary_sector_single")
+          sector_field = create(:form_field, form: registration_form, field_identifier: "primary_sector")
           create(:form_answer, form_submission: submission, form_field: sector_field, submitted_answer: sector.id.to_s)
 
           age_range = create(:category_type, name: "AgeRange")
diff --git a/spec/services/event_dashboard_spec.rb b/spec/services/event_dashboard_spec.rb
index 198e3a873..065110509 100644
--- a/spec/services/event_dashboard_spec.rb
+++ b/spec/services/event_dashboard_spec.rb
@@ -297,15 +297,15 @@
         # single-select dropdown. Both also carry sector1 as a tag, so sector1 is
         # primary for person1 AND an additional sector for person2 — the counts
         # overlap (don't partition).
-        service_field = create(:form_field, form: registration_form, field_identifier: "primary_service_area_single",
-                                            answer_type: :single_select_dropdown)
-        create(:form_answer, form_field: service_field, submitted_answer: sector1.id.to_s,
+        primary_field = create(:form_field, form: registration_form, field_identifier: "primary_sector",
+                                             answer_type: :single_select_dropdown)
+        create(:form_answer, form_field: primary_field, submitted_answer: sector1.id.to_s,
                              form_submission: FormSubmission.find_by!(person: person1, form: registration_form))
-        create(:form_answer, form_field: service_field, submitted_answer: sector2.id.to_s,
+        create(:form_answer, form_field: primary_field, submitted_answer: sector2.id.to_s,
                              form_submission: FormSubmission.find_by!(person: person2, form: registration_form))
       end
 
-      it "counts distinct sectors named as a primary service area" do
+      it "counts distinct sectors named as a primary sector" do
         expect(dashboard.primary_sector_count).to eq(2)
       end
 
@@ -569,11 +569,9 @@
     end
 
     it "gathers header (sector / age group) answers keyed by applicant, sector answers under the normalized sector key" do
-      # Use a legacy "service area" identifier to confirm it still resolves under
-      # the normalized sector key alongside the current "sector" identifiers.
-      service_field = create(:form_field, form: registration_form, name: "Primary sector", field_identifier: "primary_service_area")
+      sector_field = create(:form_field, form: registration_form, name: "Additional sectors", field_identifier: "additional_sectors")
       reg_submission = FormSubmission.find_by(person: embedded_applicant, form: registration_form)
-      create(:form_answer, form_submission: reg_submission, form_field: service_field, submitted_answer: "5")
+      create(:form_answer, form_submission: reg_submission, form_field: sector_field, submitted_answer: "5")
 
       header = dashboard.header_answers_by_applicant
 
diff --git a/spec/services/event_registration_services/public_registration_spec.rb b/spec/services/event_registration_services/public_registration_spec.rb
index 49c66aa54..27e925b74 100644
--- a/spec/services/event_registration_services/public_registration_spec.rb
+++ b/spec/services/event_registration_services/public_registration_spec.rb
@@ -582,7 +582,7 @@ def register_with_agency_type(value)
         event: event,
         registration_form: form,
         form_params: base_form_params(first_name: "Pat", last_name: "Lee", email: "pat@example.com").merge(
-          field_id("primary_sector_single") => primary_sector.id.to_s,
+          field_id("primary_sector") => primary_sector.id.to_s,
           field_id("additional_sectors") => [ additional_sector.id.to_s ]
         )
       )
@@ -601,7 +601,7 @@ def register_with_agency_type(value)
         event: event,
         registration_form: form,
         form_params: base_form_params(first_name: "Pat", last_name: "Lee", email: "pat@example.com").merge(
-          field_id("primary_sector_single") => primary_sector.id.to_s
+          field_id("primary_sector") => primary_sector.id.to_s
         )
       )
 
@@ -616,7 +616,7 @@ def register_with_agency_type(value)
         event: event,
         registration_form: form,
         form_params: base_form_params(first_name: "Pat", last_name: "Lee", email: "pat@example.com").merge(
-          field_id("primary_sector_single") => primary_sector.id.to_s
+          field_id("primary_sector") => primary_sector.id.to_s
         )
       )
 
diff --git a/spec/services/form_builder_service_spec.rb b/spec/services/form_builder_service_spec.rb
index 8f4edf6d4..688f6aca9 100644
--- a/spec/services/form_builder_service_spec.rb
+++ b/spec/services/form_builder_service_spec.rb
@@ -153,7 +153,7 @@
       let(:form) { described_class.new(name: "Test", sections: %i[professional_info]).call }
 
       it "asks for a single primary sector via a dropdown before the additional sectors checkboxes" do
-        primary = form.form_fields.find_by(field_identifier: "primary_sector_single")
+        primary = form.form_fields.find_by(field_identifier: "primary_sector")
         additional = form.form_fields.find_by(field_identifier: "additional_sectors")
 
         expect(primary).to have_attributes(name: "Primary sector", answer_type: "single_select_dropdown")
diff --git a/spec/system/public_registration_form_submission_spec.rb b/spec/system/public_registration_form_submission_spec.rb
index e43aa8e8d..84e8d1340 100644
--- a/spec/system/public_registration_form_submission_spec.rb
+++ b/spec/system/public_registration_form_submission_spec.rb
@@ -103,7 +103,7 @@
         "agency_website" => "https://hope.example.org",
         "agency_type" => "501c3/nonprofit",
         "agency_country" => "United States",
-        "primary_sector_single" => sector_education.id.to_s,
+        "primary_sector" => sector_education.id.to_s,
         "additional_sectors" => sector_mental_health.id.to_s,
         "primary_age_group" => age_adults.id.to_s,
         "additional_age_group" => age_teens.id.to_s,
@@ -141,7 +141,7 @@
       expect(page).not_to have_selector("##{pr_dom_id(reg_field('first_name'))}")
       expect(page).not_to have_selector("##{pr_dom_id(reg_field('mailing_city'))}")
 
-      select_pr reg_field("primary_sector_single"), "Education"
+      select_pr reg_field("primary_sector"), "Education"
       check_pr_box reg_field("additional_sectors"), sector_dv.id.to_s
       select_pr reg_field("primary_age_group"), "Teens (13-17)"
       choose_pr_radio reg_field("racial_ethnic_identity"), "Asian"
@@ -159,7 +159,7 @@
 
       answers = answers_by_identifier(registration_form.form_submissions.find_by!(person: logged_in_person))
       expect(answers).to include(
-        "primary_sector_single" => sector_education.id.to_s,
+        "primary_sector" => sector_education.id.to_s,
         "additional_sectors" => sector_dv.id.to_s,
         "primary_age_group" => age_teens.id.to_s,
         "racial_ethnic_identity" => "Asian",
@@ -409,7 +409,7 @@ def fill_full_registration
     fill_pr_text reg_field("agency_zip"), with: "91101"
     fill_pr_text reg_field("agency_country"), with: "United States"
 
-    select_pr reg_field("primary_sector_single"), "Education"
+    select_pr reg_field("primary_sector"), "Education"
     check_pr_box reg_field("additional_sectors"), sector_mental_health.id.to_s
     select_pr reg_field("primary_age_group"), "Adults (18+)"
     check_pr_box reg_field("additional_age_group"), age_teens.id.to_s