INSPECTIONS of septic tanks will start this summer and householders will be given notification at least 10 days in advance.
More than 400,000 households – 80pc of the total with septic tanks – met the deadline to register.
Inspections will be based on a national plan due to be published shortly by the Environmental Protection Agency. Mr Hogan said the "silent majority" supported the objective to protect public health with better water quality.
"I commend the vast majority of law-abiding householders who have sent a very clear and strong message to the irresponsible members of the opposition who advocated breaking the law."