lake lammijarv between lake peipsichudskoe and lake pihkva is according to estonian classification partly moderate lake peipsichudskoe side and partly bad lake pihkva side at the time of the first assessment the ecological status of the narva river was reported as good and the transboundary impact was assessed to be insignificant the lake peipsichudskoe retains some of the pollution load which improves water quality in the narva