Pembrokeshire County Council and Pembroke Town Council have stated that they are aware of a number of concerns that have been raised regarding the recent increase in vegetation growth within Pembroke Mill Pond.

Recent observations indicate that the water remains relatively clear and that fish are actively present throughout the pond.

A PCC spokesperson stated: “While these factors alone do not provide a complete assessment of water quality, they are generally positive indicators of the pond's condition. Natural Resources Wales has previously undertaken water quality monitoring within the pond in response to this blanket weed growth, no evidence of significant nutrient enrichment was present at the time.

“At present, we do not have any reason to suspect there is blue green algae, there are no obvious visual signs typically associated with blue-green algae, such as discoloured water, surface scums or paint-like accumulations.

“The vegetation currently visible is considered most likely, again, to be blanket weed, an algae that commonly develops in shallow water bodies. Recent, sustained periods of hot, sunny weather and extended daylight hours have created favourable conditions for growth, resulting in a more noticeable presence than is normally observed.

“This is further exacerbated by lack of rainfall which has resulted in reduced flows and therefore less throughput of water into the Mill Pond. Site observations also indicate that the vegetation is not currently preventing wildlife from using the pond.

“A variety of waterbirds, including ducks, swans and moorhens, have been observed, with both adults and young birds present. This suggests that the pond continues to provide suitable habitat and has supported successful breeding activity this year.”

Works have been undertaken in recent years through collaboration between Pembroke Town Council, PCC and NRW to reduce the nutrient input into the pond within the Pembroke River Catchment and although initial feedback and results are positive, nutrient build up in sediment can take a number of years to substantially reduce following many years of input.

The spokesperson continued: “Based on current observations, there are no immediate concerns regarding the overall condition of the Mill Pond, its wildlife habitat, or any obvious signs of water quality issues.

“The situation will continue to be monitored, and any concerns raised by residents will be reviewed with the relevant officers within Pembrokeshire County Council and, where appropriate, external partners.

“In conclusion, the current substantial growth of blanket weed on the pond is highly likely to be as a result of the substantial and prolonged sunny weather associated with the heatwaves experienced.

“The historic issue of excess nutrients in the Mill Pond will have no doubt contributed to the situation and the work being done by Pembroke Town Council, Pembrokeshire County Council and NRW in addressing this through the Pembroke River Catchment Project is still considered to be the most appropriate long-term approach.

“Discussions are on-going regarding the long-term maintenance of the Mill Pond, with all options being considered.”

Anyone with concerns is encouraged to contact [email protected] and, where possible, provide photographs to help inform any further assessment.