Striking a balance between big business and a clean-green image is a fine line.
The Government only requires fresh waterways to be safe for wading and boating. For one Te Uriroroi man, Millan Ruka, that simply isn't good enough, nor is the state of the thousands of kilometres of Northland's waterways he patrols.
Native Affairs reporter Adrian Stevanon went up stream with Ngā Puhi's river cop.