Before the May 31 deadline, the regional council announced that of the 1229 properties in the catchment that needed a FEMP, 360 were still outstanding.
The council then granted landowners the grace period till June 29 to submit their plan or produce a 'satisfactory response' to the FEMP requirement, or risk fines of up to $300,000.
Before last week's grace period ended, the council released new figures to show that 90 per cent of the catchment was covered by a FEMP, but there were still 253 outstanding.
"Unfortunately, we will need to move to enforcement action or prosecution proceedings for those who don't act," said council's regulation manager Liz Lambert.
"We're not trying to ping people, we want them to do what is required but at the same time we won't let that situation go on forever."
Lambert said the grace period was for the benefit of those landowners who had lodged their FEMPs with an approved provider, but the provider had not yet been able to complete them.
Now the period had ended, Lambert said non-compliant landowners would need resource consent to continue operating, but also that a FEMP would be the first requirement to get consent.
More information is at hbrc.govt.nz, search: #farmplan