diff --git a/.env.example b/.env.example
index 8dba92c3..1b59d08b 100644
--- a/.env.example
+++ b/.env.example
@@ -12,5 +12,9 @@ VITE_API_URL=https://api.seahavenindustries.com/api
 # Leave blank to disable telemetry for that build.
 VITE_SENTRY_DSN=
 
+# Sentry environment label (development, staging, production). Blank falls back
+# to the Vite build mode.
+#VITE_SENTRY_ENVIRONMENT=
+
 # Development proxy target (used by vite.config.ts)
 #VITE_API_TARGET=http://localhost:5141
diff --git a/.env.production b/.env.production
index 205c2f1a..6ca55486 100644
--- a/.env.production
+++ b/.env.production
@@ -3,5 +3,8 @@
 # and prod builds must override VITE_API_URL per environment (api.staging..., etc.).
 VITE_API_URL=https://api.dev.seahaven.com/api
 
-# Public browser configuration; deployment must provide the environment's Sentry DSN.
-VITE_SENTRY_DSN=
+# Public browser configuration; the DSN is public by design and baked into the
+# bundle. Blank disables telemetry. These are the DEV deploy values: staging
+# and future prod jobs override them per environment.
+VITE_SENTRY_DSN=https://902f431c6e762aa849c9a07b77f0c3ac@o4511989453029376.ingest.de.sentry.io/4511990364700752
+VITE_SENTRY_ENVIRONMENT=development
diff --git a/.github/workflows/deploy-staging.yml b/.github/workflows/deploy-staging.yml
index eed6460e..708fac98 100644
--- a/.github/workflows/deploy-staging.yml
+++ b/.github/workflows/deploy-staging.yml
@@ -32,6 +32,7 @@ jobs:
     environment: staging
     env:
       VITE_API_URL: https://api.staging.seahaven.com/api
+      VITE_SENTRY_ENVIRONMENT: staging
       AWS_REGION: us-east-1
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
@@ -68,9 +69,10 @@ jobs:
           role-to-assume: arn:aws:iam::396287094661:role/githubdeploy-shoc-frontend-new-staging
           aws-region: us-east-1
 
-      # Builds the SPA with the staging VITE_API_URL (process env overrides the
-      # dev value committed in .env.production), syncs to the staging bucket,
-      # and invalidates CloudFront.
+      # Builds the SPA with the staging VITE_API_URL and Sentry environment
+      # label (process env overrides the dev values committed in
+      # .env.production), syncs to the staging bucket, and invalidates
+      # CloudFront.
       - name: Build and publish SPA
         run: bash scripts/deploy-web.sh
         env:
diff --git a/docs/adr/0002-sentry-observability.md b/docs/adr/0002-sentry-observability.md
index d29ee772..02c0b549 100644
--- a/docs/adr/0002-sentry-observability.md
+++ b/docs/adr/0002-sentry-observability.md
@@ -22,14 +22,23 @@ the configured `VITE_API_URL` base.
 
 The DSN comes from `VITE_SENTRY_DSN`. It is intentionally treated as public
 browser configuration because every `VITE_` value is embedded in the built
-JavaScript. A missing or blank DSN leaves telemetry inactive without preventing
+JavaScript. `.env.production` commits the public DSN of the real
+`shoc-frontend` Sentry project, so dev and staging deploys are live; a missing
+or blank DSN in any other build leaves telemetry inactive without preventing
 the application from starting. Default personally identifiable information
 collection remains disabled.
 
-Source-map upload is outside this change. It requires a Sentry organization,
-project, and scoped upload token that are not currently available, plus an
-explicit deployment design for handling that credential without exposing it in
-the browser bundle.
+The Sentry environment label comes from `VITE_SENTRY_ENVIRONMENT` when set and
+non-blank, falling back to the Vite build mode otherwise. The committed
+`.env.production` labels dev deploys `development`, the staging deploy job
+overrides the label to `staging`, and a future production pipeline can set
+`production` without code changes.
+
+Source-map upload is outside this change. The Sentry organization and the
+`shoc-frontend` project now exist and receive telemetry through the committed
+public DSN, but upload still requires a scoped upload token that is not
+currently available, plus an explicit deployment design for handling that
+credential without exposing it in the browser bundle.
 
 ### Alternatives considered
 
@@ -46,6 +55,9 @@ the browser bundle.
 
 - Browser navigations and API requests are recorded as connected transactions
   when the deployment supplies a valid DSN.
+- Events are labeled by `VITE_SENTRY_ENVIRONMENT` (`development` on dev
+  deploys, `staging` on the staging job), falling back to the Vite build mode
+  when unset.
 - Every transaction is sampled. This meets the current requirement but increases
   event volume and should be reviewed against Sentry quota and retention after
   real traffic is measured.
diff --git a/src/observability/sentry.ts b/src/observability/sentry.ts
index 9a37cf51..156e44b1 100644
--- a/src/observability/sentry.ts
+++ b/src/observability/sentry.ts
@@ -10,11 +10,12 @@ import {
 import { env } from "@/lib/env";
 
 const sentryDsn = import.meta.env.VITE_SENTRY_DSN?.trim() || undefined;
+const sentryEnvironment = import.meta.env.VITE_SENTRY_ENVIRONMENT?.trim() || import.meta.env.MODE;
 const apiBaseUrl = new URL(env.apiUrl, window.location.origin).toString();
 
 Sentry.init({
   dsn: sentryDsn,
-  environment: import.meta.env.MODE,
+  environment: sentryEnvironment,
   integrations: [
     Sentry.reactRouterBrowserTracingIntegration({
       useEffect,
diff --git a/src/vite-env.d.ts b/src/vite-env.d.ts
index 4df1f98f..c7b43287 100644
--- a/src/vite-env.d.ts
+++ b/src/vite-env.d.ts
@@ -3,6 +3,8 @@
 interface ImportMetaEnv {
   readonly VITE_API_URL: string;
   readonly VITE_API_TARGET: string;
+  readonly VITE_SENTRY_DSN?: string;
+  readonly VITE_SENTRY_ENVIRONMENT?: string;
 }
 
 interface ImportMeta {