Water quality is one of the parameters defining sustainable management for companies which are looking for forest certification through FSC and CERFLOR. The principles and criteria established by these entities have served as an instrument towards the adjustment of these activities, with alternatives that aim to balance the economical, environmental, technical and social aspects. In the present case, the study area belongs to a company located in the northern plateu of the State of Santa Catarina, Brazil. This paper discusses data collected during one year in areas with contrasting soil, relief, and with or without water bars in forest roads (Table 1). These conservation measures were implemented on secondary roads and on fire breaks. Soil and water losses were evaluated by means of a Coshocton runoff sampler, in order to determine the volume of soil and water losses from surface runoff. Sediment trapped in the approach flume was collected and weighed biweekly during the monitoring period, and then taken for routine soil fertility texture analyses. Water collected in the buckets was similarly sampled and its physical-chemical properties determined. Erosion effects were assessed by comparison to standards established by CONAMA's resolution nº 357 (March 17th, 2005). Only the water parameters that presented excessive results are showed (Tables 2 and 3). Field observations found absence of floating materials, such as natural foams, oils and greases, (substances that result in taste or odor in the water) or artificial dyes.