According to the draft bylaw, the board of health would set maximum occupancy limits for houses based on wastewater capacity, and landlords would have to certify that their houses met safety requirements like adequate number of smoke detectors. Landlords would be issued a registration number and would be required to include that number in any ads of their rental. Homes, once registered, would be subject to inspection if, for example, their water bill didn’t match up with their reported occupancy, or if there was another red flag.