In relation to phosphorus, 107 water bodies were assessed, 39% passed the new targets and 61% failed.
Hyd at hanner tymor yr haf eleni roedd Estyn wedi arolygu 197 ysgol gynradd a 31 ysgol uwchradd, a gwelwyd bod angen camau pellach ar 97 ohonyn nhw – dros 40%.