Discharge Reduction Promoted for Point-Source Pollution in Reservoir Watersheds


Besides regularly monitoring reservoir water quality, the EPA has been working to reduce discharges from pollution points within reservoir watersheds, in compliance with the Ministry of Economic Affairs’ (MOEA) Forward-Looking Infrastructure Development Program. Measures include setting up total phosphorus reduction equipment at point-source pollution locations and designating total phosphorus control zones. The aim is to lighten pollution loads emitted into reservoirs and improve reservoir water quality.

To effectively ascertain changes in domestic reservoir water quality in Taiwan, the EPA has since 2017 switched from monitoring water quality every three months to once a month. To align with the MOEA’s Forward-Looking Infrastructure Development Program, regional governments are also subsidized to set up total phosphorus pollution reduction equipment in reservoirs that provide water for human use but have a higher Carlson Trophic State Index.

Currently, total phosphorus control zones are being designated for watersheds of four reservoirs. In additional, there is water quality improvement construction work ongoing at two other reservoirs. For offshore islands, aeration-exposure tanks using bionets as well as multi-soil-layering systems have been set up in testing sites to improve water quality. Thus far the test results have shown the measures effectively reduce total phosphorus.

The EPA states that it has actively promoted various total phosphorus water quality improvement strategies for point-source pollution within reservoir watersheds. It also coordinates with relevant authorities to conduct pollution control measures such as setting up sewage systems and combined purification tanks, promoting low-impact developments (LID), as well as best management practices (BMPs) for rainwater runoff and other non-point-source pollution. All of the aforementioned are carried out in hopes of gradually improving watershed water quality.

Excerpt from Environmental Policy Monthly, 22 (9)

Environmental Protection Administration, R.O.C.(Taiwan)
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