People are being advised to think about what they're putting in the toilet before they flush
Irish Water and An Taisce's Clean Coast programme are making the appeal ahead of the a regatta in Dun Laoghaire this weekend.
Locals and tourists are being reminded that certain items that shouldn't be put down a toilet.
When the 3 Ps (pee, poo and paper) are flushed down the toilet they travel along the sewer network to wastewater treatment plants.
However, every day people flush thousands of items such as wet wipes, cotton bud sticks, nappies and cotton wool pads down the toilet instead of putting them in a bin.
Irish Water says these items can have a negative impact on internal plumbing in homes and businesses, the wastewater network and our marine environment.