diff --git a/watertap/flowsheets/full_water_resource_recovery_facility/BSM2_P_extension.py b/watertap/flowsheets/full_water_resource_recovery_facility/BSM2_P_extension.py
index c352f9bd23..07d127739f 100644
--- a/watertap/flowsheets/full_water_resource_recovery_facility/BSM2_P_extension.py
+++ b/watertap/flowsheets/full_water_resource_recovery_facility/BSM2_P_extension.py
@@ -531,6 +531,7 @@ def set_operating_conditions(m):
     m.fs.Treated.properties[0].COD
     m.fs.Treated.properties[0].BOD5
     m.fs.Treated.properties[0].SNKj
+    m.fs.Treated.properties[0].SNOX
     m.fs.Treated.properties[0].SP_organic
     m.fs.Treated.properties[0].SP_inorganic