translate English to French: Data for septic systems represent the amount of nutrients that are released after retention by the septic tank and drain field has been taken into account.
Les donnÃ©es relatives aux fosses septiques reprÃ©sentent la quantitÃ© dâ€™Ã©lÃ©ments nutritifs rejetÃ©s, une fois la rÃ©tention par les fosses septiques et les champs dâ€™Ã©pandage prise en compte.