diff --git a/apps/fo/app/pages/(with-layout)/sewageOccur/modal/page.tsx b/apps/fo/app/pages/(with-layout)/sewageOccur/modal/page.tsx
index 06ca11cc1..c9c883041 100644
--- a/apps/fo/app/pages/(with-layout)/sewageOccur/modal/page.tsx
+++ b/apps/fo/app/pages/(with-layout)/sewageOccur/modal/page.tsx
@@ -5,6 +5,7 @@ import { DateMonthPicker, UiTable } from "@common/business_components/ui";
 import ListDiv from "@common/business_components/ui/list_div";
 import { Table, TableCell, TableHead, TableRow } from "@common/components/ui";
 import { useEffect, useState } from "react";
+import { start } from "repl";
 
 
 export default function SewageOccurModal(props: { fcltyName: string; facilityCd : string; searchYear : string}) {
@@ -13,10 +14,15 @@ export default function SewageOccurModal(props: { fcltyName: string; facilityCd
   
   // searchYear 유효성 검사 및 기본값 설정
   const validSearchYear = props.searchYear && /^\d{4}$/.test(props.searchYear) ? props.searchYear : new Date().getFullYear().toString();
+
   
   const [startYearMonth, setStartYearMonth] = useState(validSearchYear+'01');
   const [endYearMonth, setEndYearMonth] = useState(validSearchYear+'12');
   const [detailList, setDetailList] = useState<modalTableType[]>([]);
+  // 가능한 시작년월 설정
+  const [enableStartMonth, setEnableStartMonth] = useState<string[]>(['1월', '2월', '3월', '4월', '5월', '6월', '7월', '8월', '9월', '10월', '11월', '12월']);
+  const [enableEndMonth, setEnableEndMonth] = useState<string[]>(['1월', '2월', '3월', '4월', '5월', '6월', '7월', '8월', '9월', '10월', '11월', '12월']);
+  
   const {
     upHeadListSewageOccurDetail,
     gridListSewageOccurDetail
@@ -33,6 +39,37 @@ export default function SewageOccurModal(props: { fcltyName: string; facilityCd
 
   useEffect(() => {
       searchSewageOccurDetailList(props.facilityCd, validSearchYear, startYearMonth, endYearMonth);
+  }, [startYearMonth, endYearMonth, searchSewageOccurDetailList, props.facilityCd, validSearchYear]);
+
+  useEffect(() => {
+    const standdardMonthList = ['1월', '2월', '3월', '4월', '5월', '6월', '7월', '8월', '9월', '10월', '11월', '12월']
+
+    // 시작년월이 바뀌면 선택가능한 년월 데이터가 변경돼야 한다.
+    if(startYearMonth){
+      const startMm = startYearMonth.substring(4, 6);
+
+      standdardMonthList.forEach((month) => {
+        setEnableStartMonth((prev) => {
+          if (parseInt(month.replaceAll('월', '')) < parseInt(startMm)) {
+            return prev.filter((m) => m !== month);
+          }
+          return prev;
+        });
+      });
+    }
+
+    if(endYearMonth){
+      const endMm = endYearMonth.substring(4, 6);
+      standdardMonthList.forEach((month) => {
+        setEnableEndMonth((prev) => {
+          if (parseInt(month.replaceAll('월', '')) > parseInt(endMm)) {
+            return prev.filter((m) => m !== month);
+          }
+          return prev;
+        });
+      });
+    }
+
   }, [startYearMonth, endYearMonth]);
 
   return (
@@ -63,6 +100,7 @@ export default function SewageOccurModal(props: { fcltyName: string; facilityCd
                   selectClass="ml-5 w-[100px]"
                   startYear={1900}
                   yearReadOnly={true}
+                  enableMonth={enableStartMonth}
                 />~
                 <DateMonthPicker
                   field={{
@@ -81,6 +119,7 @@ export default function SewageOccurModal(props: { fcltyName: string; facilityCd
                   selectClass="ml-5 w-[100px]"
                   startYear={1900}
                   yearReadOnly={true}
+                  enableMonth={enableEndMonth}
                 />                
                 </TableCell>
               </TableRow>
diff --git a/apps/fo/app/store/sewageOccur/index.tsx b/apps/fo/app/store/sewageOccur/index.tsx
index 5feb91f94..f97520d17 100644
--- a/apps/fo/app/store/sewageOccur/index.tsx
+++ b/apps/fo/app/store/sewageOccur/index.tsx
@@ -222,6 +222,7 @@ export const sewageOccurReducer:(set:any)=>SewageOccurActions=(set: any) => {
                 },
             }));
             const res = await fetchSewageOccurList(pageNo, pageSize, searchYear, part, nameCd, fcltCpct, operationValue, fcltyNm);
+            const excelDownList: ExcelType[] = [];
             const data = res.data;
             // Promise.all을 사용하여 모든 비동기 작업이 완료될 때까지 기다림
             const calData = await Promise.all(data.map(async (item: SewageOccurProps) => {
@@ -301,6 +302,28 @@ export const sewageOccurReducer:(set:any)=>SewageOccurActions=(set: any) => {
                 item.estimationSewage = parseFloat((item.waterUsage * (item.swageChangePercent/100)).toFixed(2));
                 return item;
             }));
+
+            if(pageSize>5000){
+                calData.forEach((item: SewageOccurProps) => {
+                    excelDownList.push({
+                        시설코드: item.bscFctCd,
+                        권역: item.rvbsn,
+                        단위유역: item.lgbsn,
+                        중권역: item.mdmbsn,
+                        환경청: item.rgnNm,
+                        시설명: item.bscFctNm,
+                        시도: item.sido,
+                        시군구: item.sigungo,
+                        주소: item.daddr,
+                        시설용량: item.fctCpc,
+                        물사용량: item.waterUsage,
+                        오수전환율: item.swageChangePercent,
+                        오수발생량추정: item.estimationSewage,
+                        연간하수유입량 : item.sewageInputYear,
+                        청천시하수유입량 : item.sewageInputChungchun,
+                    });
+                });
+            }
             // 조회 데이터 설정
             set((state: any) => ({
                 ...state,
@@ -311,7 +334,7 @@ export const sewageOccurReducer:(set:any)=>SewageOccurActions=(set: any) => {
                     isLoading : false,
                 }:{
                     ...state.SewageOccur,
-                    excelList: [],
+                    excelList: excelDownList,
                     isLoading : false,
                 },
             }))