Discharges

   15. Discharge of contaminants into environment---(1) No person may
 discharge any---
   (a) Contaminant or water into water; or
   (b) Contaminant onto or into land in circumstances which may result in
         that contaminant (or any other contaminant emanating as a result
         of natural processes from that contaminant) entering water; or
   (c) Contaminant from any industrial or trade premises into air; or
   (d) Contaminant from any industrial or trade premises onto or into
         land---

 unless the discharge is expressly allowed by a rule of a regional plan,
 a resource consent, or regulations.

   (2) No person may discharge any contaminant into the air, or into or
 onto land, from---
   (a) Any place; or
   (b) Any other source, whether moveable or not,---

 in a manner that contravenes a rule in a regional plan or proposed
 regional plan unless the discharge is expressly allowed by a resource
 consent or allowed by section 20 (certain existing lawful activities
 allowed).