Mains sewer connection

Blackwater and greywater discharged to the public sewer, with all treatment happening off-site at the municipal works. No tank, no drain field, no land take, and nothing to maintain on the property. In exchange there is no on-site resilience whatsoever: if the network backs up or stops, the household has no fallback, and the nutrients leave the site entirely rather than being recovered.

Cost
Medium
Upkeep
None
Skill to build
Specialist
Lifespan
Connection and buried lateral: 50+ years; the public network beyond the boundary is the utility's responsibility, not the householder's
Embodied carbon
Low
Space / material use
Low
Output timing
Continuous process
Skill to repair
Specialist
Regulation (FR example)
Where a public sewer is available, connection is compulsory within two years of it being commissioned (art. L1331-1 code de la sante publique), and a connection charge applies. On-site sanitation is only permitted where no public sewer serves the property.

Note: Cost, carbon and footprint are rated against the other options for this same need, not in absolute terms.

What your site needs

A public sewer reaching the property, and a connection permitted by the commune

Inputs

Outputs

none

Sources

What this page does not tell you

No sizing or quantities: how much a technique yields, and how much a household needs, both depend on the build and the people, so the catalogue compares options rather than dimensioning them. It carries no bill of materials and no build sequence, and it is written for an oceanic, clay-soil climate (Normandy, France). Regulatory notes are indicative and need confirming locally.