Effluent discharged into ditches is not the only source conducive for mosquito production associated with OWTS. Mosquitoes can infiltrate OWTS settling tanks if lids are broken, missing, or other access points allow entry. In 2019, field biologists performed inspections door-to-door in the Tammany Hills neighborhood to understand whether mosquito production was occurring within OWTS tanks. Nearly 10% of OWTS inspected had cracked lids or other entry ports for mosquitoes to lay eggs and rear their offspring directly within the treatment systems.