The Banwy at Llanerfyl

Nobody tests this water

This is a river gauge, not a bathing water. No one samples it for E. coli or intestinal enterococci, no one issues a pollution forecast for it, and there is no annual classification. The level above says how much water is coming down — nothing at all about what is in it.

Rivers downstream of a storm overflow can carry sewage after heavy rain, and most rivers in these islands have one somewhere upstream. If you want water somebody actually tests, the nearest bathing water is below.

Where it is

That is the gauge, which is a piece of flood monitoring equipment rather than a place to get in. It tells you about this stretch of river, not about a spot on the bank.

Nearby on this site

Where this reading comes from

Natural Resources Wales, from the service behind their own river levels map. NRW publish no typical range for a gauge — no band, no average, nothing to judge a reading against — so the range on this page is worked out here, from the twelve months of readings up to 11 October 2026: the levels this gauge sat between for half of that time. It is one year rather than a long record, so it says nothing about the time of year, and it is this site’s figure and not the regulator’s. Levels are measured against a datum set for this gauge, so a reading here cannot be compared with a reading at another gauge — only with this one’s own range.

River levels on this site come from four regulators: the Environment Agency in England, SEPA in Scotland, Natural Resources Wales, and waterlevel.ie in the Republic. They do not publish the same kind of range as each other — and NRW publish none at all, so Welsh pages use a range worked out here instead. Each page says which it is using.