Napier City Council is looking to tighten its rules around stormwater, in an attempt to improve the health of Ahuriri Estuary.
A draft bylaw will be presented council's regulatory committee at a meeting on Tuesday.
The paper being presented to the committee states the current bylaw, which has been in place since 2012, means sites which are not deemed "high risk" do not have to provide a pollution prevention plan to council.
"It is sometimes bakeries and other seemingly innocuous activities [typically not defined as high risk sites] that are the worst offenders for discharging contaminants into the stormwater network," the paper states.
"Council requires greater control to be able to manage these discharges from all sites, not just those deemed high risk."