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為監控台西沿岸養殖區域之水體水質環境，建立台西海域之水質環境資料並達到預警效果，從88年7月至91年6月止，共計三個年度，在雲林台西沿海地區，選定7個監測地點進行採樣分析，共計採樣72次，分析的項目包含水文及水質資料。經三年調查分析結果，水溫與鹽度隨季節性與區域性而變化。pH值介於7.74-8.65之間，以出海口處較高。懸浮固體量範圍介於27.17-132.23 mg/L之間，以10、11月之舊虎尾溪出海口監測站2較高。溶氧量與BOD5範圍分別介於5.90-8.62 mg/L及0.50~12.5 mg/L之間。DO最低出現在7月之舊虎尾溪出海口，最高BOD5含量出現在7月之舊虎尾溪出海口監測站2。COD含量範圍介於1.04-5.82 mg/L之間，以7與8月份舊虎尾溪出海口最高。氨-氮含量範圍介於0.03-1.54 mg/L之間，最大值出現在舊虎尾溪出海口監測站與隔離水道南面監測站。亞硝酸-氮含量較少，介於0.007-0.237 mg/L之間。硝酸-氮與正磷酸-磷濃度範圍介於0.04-1.25 mg/L與0.02-0.26 mg/L之間。依衛生署海域分類結果，該海域應屬於甲類海域，由調查結果顯示，各年度均有生化需氧量不符合標準的情形，此外，本海域懸浮固體量偏高，將對於各項異常現象持續追蹤。整體而言，此海域水體環境品質，尚可供為水產養殖用水使用。

摘要abstract(英) The purpose of this experiment was to study the water quality of aquaculture area at Tai-Shi coast. From July 1999 to June 2001, water samples were collected 72 times at seven stations. Thier water temperature, salinity, pH, DO, suspended solid (SS), BOD, COD, ammonia-N, nitrite-N, nitrate-N and orthophosphate-P were analyzed. The results showed that water temperature and salinity varied with seasons and regions. The monthly average pH value was 7.74-8.65 at seven stations in three years, SS, 27.17-132.23 mg/L; DO concentration, 5.90-8.62 mg/L; BOD5, 0.50-12.5 mg/L; COD, 1.04-5.82 mg/L; ammonia-N, 0.03-1.54 mg/L; nitrite-N, 0.007-0.237 mg/L; nitrate-N, 0.04-1.25 mg/L; orthophosphate-P, 0.02-0.26 mg/L. The levels of these parameters in drain canal and old Ho-Wyu river station were higher than those in the other areas. The waters of Tai-Shi coast were up to the A grade, according to the criteria for marine enacted by the Department of Health. Thus, aquaculture was workable in the waters.