The effluent from the sewerage of industrial wastewater or sewage may be recycled and reuse only when the quality meets the standard for discharge, and shall take sampling at the outlet area before recycled for use except under any of the following situations:
1. The wastewater or sewage produced is for production process use.
2. The wastewater or sewage produced is for tower rinsing or other pollution prevention equipment and the waster after recycling has been treated by the water treatment (pretreatment) facility of wastewater or sewage before using.
The recycling of industrial wastewater or sewage from the sewerage which is not conforming to the standard of wastewater or sewage for discharge shall be regulated by the following rules:
1. The recycling of wastewater or sewage without the using of facility installed for the treatment/pretreatment of wastewater or sewage and the effluent not conforming to applicable standards of wastewater or sewage cannot be used for any other purposes beyond production process.
2. The use of water supply conforming to standard without treatment as supplementary source for mixed use shall be subject to the approval of the competent authorities of the municipality or county (city) with the presentation of the following information and shall keep track on the quantity of supplementary water supply. The record shall be kept for 3 years.
1. The necessity of supplementary water supply, the source of supplementary water supply, the maximum daily capacity of supplementary water supply and the measurement methods.
2. Explanation on the balance of water quality shall be presented to the competent authorities of the municipality or county (city) for the recycled use of wastewater or sewage without the facility for treatment/pretreatment of wastewater or sewage or where the competent authorities of the municipality or county (city) deems necessary.
If the competent authority discovered the sewerage of the industry wastewater or sewage not being approved as specified in subparagraph (II) of the previous paragraph, notify the enterprise, or the effluent from the sewerage without treatment in conformity to applicable standards cannot be used as supplementary water supply. In addition, the competent authorities of the municipality or county (city) shall notify the enterprise or the sewerage to make change in the water supply plan or permit (documents). Those who fails to comply on due time shall be subject to punishment under this law as an act of violation.

The recycled wastewater or sewage referred to in the preceding may be discharged into surface water bodies only when it meets the effluent standard. However, recycled wastewater or sewage to be used for cleaning the offices, staff dormitories, and other activity venues in the work environment shall meet the effluent standard for building sewage treatment facilities.
Physical contact with the recycled wastewater or sewage referred to in the preceding paragraph shall be avoided so as not to affect the health of staff.

For recycling of wastewater or sewage, independent and exclusive cumulative water measurement facilities shall be set up after wastewater or sewage is produced and treated, while independent and exclusive cumulative water measurement facilities shall be set up for the recycle before it takes place.
Wastewater or sewage treatment/pre-treatment facilities or storage facilities shall be set up for wastewater or sewage recycle to store it before the recycle takes place.

This chapter shall be waived if any of the following is applicable to the industrial sewerage or the sewage system:
1. The wastewater or sewage has not passed through the wastewater or sewage treatment/pretreatment facility and is just in circulation of the production process.
2. Reversal or flowing back between different components of the wastewater or sewage treatment/pretreatment facility before discharge to the collection pool (tank, outlet).
3. A purification system for the recycling of wastewater has been installed. Wastewater will be used in the production process after purification. The purification system and the subsequent wastewater or sewage treatment facility could be separated independently and there is no wastewater or sewage from the recycling system directly discharged to the water body or soil.
If there is a concern of the competent authority that the purified wastewater was recycled for using in the production process as stated in subparagraph III cannot perform the function of purifying wastewater, the competent authorities of the municipality or the county (city) shall notify the enterprises or the sewerage to provide related materials for justifying the purification system of recycling can help to reduce water pollutants from the wastewater within stipulated time span. If no explanation could be provided by the deadline, or, the competent authority deems there is no function for purifying the quality of original wastewater, the competent authorities of the municipality or county (city) shall notify the enterprise or the sewerage to following the rules in this chapter, and proceed to change in the water treatment plan or permit (document). Those who fails to make change on due time shall be subject to punishment as an act of violation.