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並前往https://naturalresources.wales/permits-and-permissions/water-discharges-and-septic-tanks/private-sewage-treatment-in-an-area-with-a-public-sewer/?lang=en

Private sewage treatment in an area with a public sewer

The use of private domestic sewage treatment in a sewered area is only permissible if connection to the public sewer is not feasible.

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