The Forestry Commission Wales has apologised after it was fined £24,000 in court for polluting a 20-mile (33km) stretch of waterway in Powys.
The commission admitted causing pollution after soil and silt disturbed by heavy machinery strayed into a brook near Llanwrtyd Wells.
The Environment Agency, which prosecuted, said the rivers Cledan, Irfon and Wye were polluted too.
The commission said it had tightened its procedures following the incident.
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