diff --git a/config/CommonParam.xml b/config/CommonParam.xml
index 2d24e8e06..9929c5415 100644
--- a/config/CommonParam.xml
+++ b/config/CommonParam.xml
@@ -267,6 +267,9 @@ Or changing the name of this parameter set
 
   <param_set name="Lepton">
     <param type="bool" name="ApplyCoulombCorrection"> false </param>
+    <!-- Q^2 threshold for em scattering events, in GeV^2 (was hardcoded as
+         static const double kMinQ2Limit in src/Framework/Utils/KineUtils.h) -->
+    <param type="double" name="EM-MinQ2Limit"> 0.02 </param>
 
   </param_set>
 
diff --git a/src/Framework/Utils/KineUtils.cxx b/src/Framework/Utils/KineUtils.cxx
index 38ad3fa9b..c42ff5b8f 100644
--- a/src/Framework/Utils/KineUtils.cxx
+++ b/src/Framework/Utils/KineUtils.cxx
@@ -26,12 +26,37 @@
 #include "Framework/Utils/KineUtils.h"
 #include "Framework/Numerical/MathUtils.h"
 #include "Framework/Interaction/InteractionException.h"
+#include "Framework/Algorithm/AlgConfigPool.h"
+#include "Framework/Registry/Registry.h"
 
 #include <sstream>
 
 using namespace genie;
 using namespace genie::constants;
 
+//____________________________________________________________________________
+// Runtime-configurable EM Q^2 threshold. The value is read once from
+// CommonParam.xml [Lepton] / "EM-MinQ2Limit" and cached for the lifetime of the
+// program; it falls back to 0.02 GeV^2 (the historical hardcoded value) if the
+// registry is unavailable. The read is lazy (first use), so AlgConfigPool is
+// guaranteed initialised by the time any EM kinematics runs.
+genie::utils::kinematics::electromagnetic::EMMinQ2LimitProxy::operator double() const
+{
+  static const double value = []() -> double {
+    AlgConfigPool * pool = AlgConfigPool::Instance();
+    Registry * r = pool ? pool->CommonList("Param", "Lepton") : nullptr;
+    const double v = r ? r->GetDoubleDef("EM-MinQ2Limit", 0.02) : 0.02;
+    LOG("KineLimits", pNOTICE)
+      << "EM-MinQ2Limit = " << v << " GeV^2 (CommonParam.xml [Lepton] registry "
+      << (r ? "found" : "missing, using fallback") << ")";
+    return v;
+  }();
+  return value;
+}
+
+const genie::utils::kinematics::electromagnetic::EMMinQ2LimitProxy
+genie::utils::kinematics::electromagnetic::kMinQ2Limit;
+
 //____________________________________________________________________________
 double genie::utils::kinematics::PhaseSpaceVolume(
   const Interaction * const in, KinePhaseSpace_t ps)
diff --git a/src/Framework/Utils/KineUtils.h b/src/Framework/Utils/KineUtils.h
index 74c400e80..d4a5ccc69 100644
--- a/src/Framework/Utils/KineUtils.h
+++ b/src/Framework/Utils/KineUtils.h
@@ -111,7 +111,12 @@ namespace kinematics
    Range1D_t  InelYLim    (double El, double ml, double M);
    Range1D_t  InelYLim_X  (double El, double ml, double M, double x);
 
-   static const double kMinQ2Limit   = 0.02;  // GeV^2 // Q2 threshold relevant for em scattering events
+   // Configurable Q^2 threshold for em scattering events (GeV^2).
+   // Reads "EM-MinQ2Limit" from CommonParam.xml [Lepton] on first use; falls
+   // back to 0.02 (the historical hardcoded value) if absent. Implicitly
+   // converts to double so all existing call sites compile unchanged.
+   struct EMMinQ2LimitProxy { operator double() const; };
+   extern const EMMinQ2LimitProxy kMinQ2Limit;
   }
 
 } // kinematics namespace