diff --git a/server/src/storyteller/mod.rs b/server/src/storyteller/mod.rs
index dd997ed5a..4b980210f 100644
--- a/server/src/storyteller/mod.rs
+++ b/server/src/storyteller/mod.rs
@@ -7,8 +7,8 @@
 //!
 //! ## Contamination (#254)
 //!
-//! After `CONTAMINATION_DELAY_TICKS` (default 1800 = 30 game-minutes at
-//! 10 tps), the storyteller:
+//! After `CONTAMINATION_DELAY_TICKS` (default 300 = 30 game-minutes at
+//! 10 ticks/game-minute per D-031), the storyteller:
 //! 1. Sets `ContaminationActive` resource to true (one-shot)
 //! 2. Applies a tension delta to all `ActiveFork` triangles
 //! 3. Emits a `ContaminationEvent` for downstream systems (monologue, etc.)
@@ -18,14 +18,14 @@ use bevy_ecs::prelude::*;
 
 use crate::content::template::{TriangleClassification, TriangleState};
 use crate::simulation::tier::ActiveSim;
-use crate::simulation::time::SimulationTime;
+use crate::simulation::time::{SimulationTime, TICKS_PER_GAME_MINUTE};
 
 // ---------------------------------------------------------------------------
 // Constants
 // ---------------------------------------------------------------------------
 
-/// Tick at which contamination activates (30 game-minutes × 10 tps × 60s = 1800).
-pub const CONTAMINATION_DELAY_TICKS: u64 = 1800;
+/// Tick at which contamination activates (30 game-minutes × 10 ticks/minute = 300).
+pub const CONTAMINATION_DELAY_TICKS: u64 = 30 * TICKS_PER_GAME_MINUTE;
 
 /// Tension delta applied to ActiveFork triangles when contamination fires.
 pub const CONTAMINATION_PRESSURE_DELTA: u8 = 10;
@@ -41,7 +41,7 @@ pub const CONFRONTATION_THRESHOLD: u8 = 75;
 /// Whether contamination has been activated by the storyteller.
 ///
 /// Once set to `true`, it stays true for the remainder of the session.
-/// Persisted via save state (future — currently session-scoped).
+/// Persisted in `SaveStateV1` to prevent double-firing on save/load.
 #[derive(Resource, Debug, Clone, Default)]
 pub struct ContaminationActive(pub bool);
 
diff --git a/server/tests/contamination.rs b/server/tests/contamination.rs
index 4ff1b6649..07b82b4dc 100644
--- a/server/tests/contamination.rs
+++ b/server/tests/contamination.rs
@@ -42,10 +42,10 @@ fn make_triangle(
     }
 }
 
-/// Acceptance test: run 1801 ticks, assert ContaminationActive is set and
-/// all ActiveFork TriangleState entities have tension > 0.
+/// Acceptance test: run past CONTAMINATION_DELAY_TICKS, assert ContaminationActive
+/// is set and all ActiveFork TriangleState entities have tension > 0.
 #[test]
-fn contamination_activates_after_1801_ticks() {
+fn contamination_activates_after_delay() {
     let mut world = World::new();
     world.init_resource::<SimulationTime>();
     world.init_resource::<ContaminationActive>();
@@ -102,8 +102,8 @@ fn contamination_activates_after_1801_ticks() {
     let mut schedule = Schedule::default();
     schedule.add_systems(tick_contamination_activation);
 
-    // Simulate 1801 ticks
-    for tick in 0..=1800 {
+    // Simulate past the delay threshold (CONTAMINATION_DELAY_TICKS = 300)
+    for tick in 0..=CONTAMINATION_DELAY_TICKS {
         world.resource_mut::<SimulationTime>().tick = tick;
         schedule.run(&mut world);
     }
@@ -111,7 +111,8 @@ fn contamination_activates_after_1801_ticks() {
     // Assert ContaminationActive is set
     assert!(
         world.resource::<ContaminationActive>().0,
-        "ContaminationActive must be true after 1801 ticks"
+        "ContaminationActive must be true after CONTAMINATION_DELAY_TICKS ({}) ticks",
+            CONTAMINATION_DELAY_TICKS
     );
 
     // Assert all ActiveFork triangles have tension > 0