diff --git a/CMakeLists.txt b/CMakeLists.txt
index b7ebd6629..b0c707d40 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,7 +22,7 @@ endif()
 
 
 project(swmm-solver
-    VERSION 5.2.3
+    VERSION 1.0.0
     LANGUAGES C CXX
 )
 
diff --git a/extern/version.h.in b/extern/version.h.in
index 6fcc6a895..1a23b6cb3 100644
--- a/extern/version.h.in
+++ b/extern/version.h.in
@@ -16,24 +16,17 @@
 
 
 #define PROJECT             "SWMM"
-#define ORGANIZATION        "Open_Water_Analytics"
+#define ORGANIZATION        "pyswmm"
 
-#define VERSION             "@swmm-solver_VERSION@"
-#define VERSION_MAJOR       @swmm-solver_VERSION_MAJOR@
-#define VERSION_MINOR       @swmm-solver_VERSION_MINOR@
-#define VERSION_PATCH       @swmm-solver_VERSION_PATCH@
-#define GIT_HASH            "@GIT_HASH@"
+#define TK_VERSION             "@swmm-solver_VERSION@"
+#define TK_VERSION_MAJOR       @swmm-solver_VERSION_MAJOR@
+#define TK_VERSION_MINOR       @swmm-solver_VERSION_MINOR@
+#define TK_VERSION_PATCH       @swmm-solver_VERSION_PATCH@
+#define Tk_GIT_HASH            "@GIT_HASH@"
 
 #define PLATFORM            "@CMAKE_SYSTEM_NAME@"
 #define COMPILER            "@CMAKE_C_COMPILER_ID@"
 #define COMPILER_VERSION    "@CMAKE_C_COMPILER_VERSION@"
 #define BUILD_ID            "@BUILD_ID@"
 
-
-static inline int get_version_legacy() { \
-    return VERSION_MAJOR * 10000 + VERSION_MINOR * 1000 + VERSION_PATCH; \
-}
-
-
-
 #endif /* VERSION_H_ */
diff --git a/src/solver/consts.h b/src/solver/consts.h
index 3cf490793..e5d851b14 100644
--- a/src/solver/consts.h
+++ b/src/solver/consts.h
@@ -16,8 +16,7 @@
 // General Constants
 //------------------
 
-// OWA Version string stored in version.h
-// #define   VERSION            52003
+#define   VERSION            52003 
 #define   MAGICNUMBER        516114522
 #define   EOFMARK            0x1A           // Use 0x04 for UNIX systems
 #define   MAXTITLE           3              // Max. # title lines
diff --git a/src/solver/output.c b/src/solver/output.c
index 507af9e56..c299560c0 100644
--- a/src/solver/output.c
+++ b/src/solver/output.c
@@ -192,13 +192,7 @@ int output_open()
     F_SEEK(Fout.file, 0, SEEK_SET);
     k = MAGICNUMBER;
     fwrite(&k, sizeof(INT4), 1, Fout.file);   // Magic number
-    
-    // OWA EDIT ########################################################
-    // OWA manages model version differently from EPA SWMM. 
-    //This function call maintains compatibility
-    k = get_version_legacy();
-    //##################################################################
-                    
+    k = VERSION;
     fwrite(&k, sizeof(INT4), 1, Fout.file);   // Version number
     k = FlowUnits;
     fwrite(&k, sizeof(INT4), 1, Fout.file);   // Flow units
diff --git a/src/solver/report.c b/src/solver/report.c
index dd1a3c9d4..ec14f9426 100644
--- a/src/solver/report.c
+++ b/src/solver/report.c
@@ -227,9 +227,10 @@ void report_writeLogo()
 //
 // OWA manages model version differently from EPA SWMM. 
 {
+    fprintf(Frpt.file, FMT08);
 	sprintf(Msg, \
-		"\n  OWA STORM WATER MANAGEMENT MODEL - VERSION v%s (OWA %.10s)", 
-        VERSION, BUILD_ID);
+		"\n  PYSWMM TOOLKIT API - VERSION v%s (%.10s)", 
+        TK_VERSION, BUILD_ID);
 
     fprintf(Frpt.file, "%s", Msg);
     fprintf(Frpt.file, FMT09);
diff --git a/src/solver/swmm5.c b/src/solver/swmm5.c
index 2e49e27f4..d6137ad6a 100644
--- a/src/solver/swmm5.c
+++ b/src/solver/swmm5.c
@@ -774,14 +774,14 @@ int  DLLEXPORT swmm_getMassBalErr(float *runoffErr, float *flowErr,
 int  DLLEXPORT swmm_getVersion()
 //
 //  Input:   none
-//  Output:  returns SWMM engine version number in legacy format
+//  Output:  returns SWMM engine version number
 //  Purpose: retrieves version number of current SWMM engine which
 //           uses a format of xyzzz where x = major version number,
 //           y = minor version number, and zzz = build number.
 //
 //  NOTE: Each New Release should be updated in consts.h
 {
-    return get_version_legacy();
+    return VERSION;
 }
 
 //=============================================================================