diff --git a/apps/st/src/components/util/column/review/SeweragePenetrationRateRvwColumn.ts b/apps/st/src/components/util/column/review/SeweragePenetrationRateRvwColumn.ts
index acb635784..f9833685b 100644
--- a/apps/st/src/components/util/column/review/SeweragePenetrationRateRvwColumn.ts
+++ b/apps/st/src/components/util/column/review/SeweragePenetrationRateRvwColumn.ts
@@ -1,5 +1,5 @@
 import { ValueType } from "realgrid";
-import { footerIntArrayByDivision, footerDecimal3ArrayByDivision } from "@/components/util/grid/footerSummary";
+import { footerIntArrayByDivision, footerDecimal3ArrayByDivision, footerAvgDecimalArrayByDivision } from "@/components/util/grid/footerSummary";
 import type { GridView, DataColumn, ColumnFooter } from "@/components/type/DataGrid.type";
 
 // 하수도 통계 관리 01. 하수도 보급률
@@ -166,9 +166,9 @@ export const SeweragePenetrationRateInfoList = {
         { name: 'town_swtt_popltn', fieldName: '오수처리인구', header: { text: '오수처리인구' }, footer: footerIntArrayByDivision, valueType: ValueType.NUMBER, dataFormat: '#,##0' },
         { name: 'town_wrrtn_popltn', fieldName: '정화조인구', header: { text: '정화조인구' }, footer: footerIntArrayByDivision, valueType: ValueType.NUMBER, dataFormat: '#,##0' },
         { name: 'swge_proc_zone_outer_ar', fieldName: 'swge_proc_zone_outer_ar', header: { text: '면적(㎢)' }, footer: footerDecimal3ArrayByDivision, valueType: ValueType.NUMBER, dataFormat: '#,##0.000' },
-        { name: 'pblswrg_popltn_suprt', fieldName: '공공하수처리구역인구보급율(%)', header: { text: '공공하수처리구역인구보급율(%)' } },
-        { name: 'adtrt_popltn_suprt', fieldName: '고도처리인구보급율(%)', header: { text: `고도처리인구보급율(%)` } },
-        { name: 'swrg_instlrt', fieldName: '하수도설치율(%)', header: { text: '하수도설치율(%)' } },
+        { name: 'pblswrg_popltn_suprt', fieldName: '공공하수처리구역인구보급율(%)', header: { text: '공공하수처리구역인구보급율(%)' }, footer: footerAvgDecimalArrayByDivision, valueType: ValueType.NUMBER, dataFormat: '#,##0.000' },
+        { name: 'adtrt_popltn_suprt', fieldName: '고도처리인구보급율(%)', header: { text: `고도처리인구보급율(%)` }, footer: footerAvgDecimalArrayByDivision, valueType: ValueType.NUMBER, dataFormat: '#,##0.000' },
+        { name: 'swrg_instlrt', fieldName: '하수도설치율(%)', header: { text: '하수도설치율(%)' }, footer: footerAvgDecimalArrayByDivision, valueType: ValueType.NUMBER, dataFormat: '#,##0.000' },
         { name: 'rmk', fieldName: '비고', header: { text: '비고' } },
     ],
     columnLayout: [
diff --git a/apps/st/src/components/util/grid/footerSummary.ts b/apps/st/src/components/util/grid/footerSummary.ts
index 3ae0b0982..cbf60db84 100644
--- a/apps/st/src/components/util/grid/footerSummary.ts
+++ b/apps/st/src/components/util/grid/footerSummary.ts
@@ -107,6 +107,55 @@ export const getFooterSummaryByDivision = (
     return sum;
 };
 
+// "구분" 필드 값에 따라 필터링하여 평균 계산하는 함수
+// divisionIndex: 0 = 첫 번째 고유값, 1 = 두 번째 고유값
+export const getFooterAvgSummaryByDivision = (
+    grid: GridView, 
+    column: DataColumn, 
+    divisionIndex: number,
+    divisionFieldName: string = '구분'
+) => {
+    const dataSource = grid.getDataSource();
+    const rowCount = dataSource.getRowCount();
+    let sum = 0;
+    let count = 0;
+
+    // "구분" 필드의 고유값 찾기
+    const divisionValues = getDivisionValues(grid, divisionFieldName);
+    if (divisionValues.length <= divisionIndex) {
+        return 0; // 해당 인덱스의 고유값이 없으면 0 반환
+    }
+    
+    const targetDivision = divisionValues[divisionIndex];
+
+    for (let i = 0; i < rowCount; i++) {
+        // "구분" 필드 값 확인
+        const divisionValue = dataSource.getValue(i, divisionFieldName);
+        if (String(divisionValue) !== targetDivision) {
+            continue; // 해당 "구분" 값이 아니면 스킵
+        }
+
+        const cellValue = dataSource.getValue(i, column.fieldName);
+        
+        // 문자열인 경우 숫자로 변환
+        const numericValue = typeof cellValue === 'string'
+            ? Number(String(cellValue).replace(/,/g, ''))
+            : Number(cellValue);
+
+        if (!isNaN(numericValue) && numericValue !== null && numericValue !== undefined) {
+            sum += numericValue;
+            count += 1;
+        }
+    }
+
+    if (count === 0) {
+        return 0;
+    }
+
+    const avg = sum / count;
+    return Math.floor(avg * 10) / 10;
+};
+
 // Footer 설정 객체 생성 함수
 const createSumFooter = (format: string) => ({
     expression: 'sum' as const,
@@ -156,6 +205,38 @@ const createSumFooterArrayByDivision = (format: string) => [
     },
 ];
 
+// "구분" 값에 따라 필터링하는 평균 Footer 배열 생성 함수 (2줄)
+const createAvgFooterArrayByDivision = (format: string) => [
+    {
+        numberFormat: format,
+        valueCallback: (
+            grid: GridView, 
+            column: DataColumn, 
+            footerIndex: number, 
+            columnFooter: unknown, 
+            value: number | string | undefined
+        ) => {
+            // footerIndex: 0 = 첫 번째 footer 행 (첫 번째 "구분" 값), 1 = 두 번째 footer 행 (두 번째 "구분" 값)
+            // footerIndex를 divisionIndex로 사용
+            return getFooterAvgSummaryByDivision(grid, column, footerIndex);
+        },
+    },
+    {
+        numberFormat: format,
+        valueCallback: (
+            grid: GridView, 
+            column: DataColumn, 
+            footerIndex: number, 
+            columnFooter: unknown, 
+            value: number | string | undefined
+        ) => {
+            // footerIndex: 0 = 첫 번째 footer 행 (첫 번째 "구분" 값), 1 = 두 번째 footer 행 (두 번째 "구분" 값)
+            // footerIndex를 divisionIndex로 사용
+            return getFooterAvgSummaryByDivision(grid, column, footerIndex);
+        },
+    },
+];
+
 // 1. 정수형 : #,##0
 export const footerInt = createSumFooter('#,##0');
 
@@ -171,12 +252,17 @@ export const footerDecimal3 = createSumFooter('#,##0.000');
 // "구분" 값에 따라 필터링하는 Footer 배열 (정수형, 2줄)
 export const footerIntArrayByDivision = createSumFooterArrayByDivision('#,##0');
 
+// "구분" 값에 따라 필터링하는 Footer 배열 (소수점 1자리, 2줄)
 export const footerDecimal1ArrayByDivision = createSumFooterArrayByDivision('#,##0.0');
 
+// "구분" 값에 따라 필터링하는 Footer 배열 (소수점 2자리, 2줄)
 export const footerDecimal2ArrayByDivision = createSumFooterArrayByDivision('#,##0.00');
 
 // "구분" 값에 따라 필터링하는 Footer 배열 (소수점 3자리, 2줄)
 export const footerDecimal3ArrayByDivision = createSumFooterArrayByDivision('#,##0.000');
 
 // 률(%) 평균 값(기본 소수점 1자리)
-export const footerAvgDecimal = createAvgFooter('#,##0.0');
\ No newline at end of file
+export const footerAvgDecimal = createAvgFooter('#,##0.0');
+
+// "구분" 값에 따라 필터링하는 평균 Footer 배열 (소수점 1자리, 2줄)
+export const footerAvgDecimalArrayByDivision = createAvgFooterArrayByDivision('#,##0.0');
\ No newline at end of file