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Plumbingaka: sewer mainaka: public seweraka: municipal sewer

Sanitary Sewer

In Plain English

The city's underground pipe network that carries wastewater away from buildings to a treatment plant.

Definition

The municipal underground pipe system that collects and transports wastewater from buildings to a treatment facility. Sanitary sewers carry only domestic sewage and are separate from storm sewers in modern systems. Connection to the sanitary sewer requires a building permit and inspection of the building sewer.

Why It Matters in Bidding

Sanitary sewer scope often involves deep excavation, shoring, dewatering, and utility connections that carry significant cost and risk on a site bid, plus tap and permit fees that estimators must capture. Coordination with the municipality and verifying invert elevations are critical, because a connection that requires more depth or a lift station than assumed can dramatically change the number after award.

Example

Pricing a restaurant site, the estimator confirms the sewer main depth and invert, then bids the building lateral, the tap fee, trench shoring, and bedding to connect the building to the city sanitary main.

Related Terms

Building SewerBuilding DrainCleanoutSoil Pipe

Frequently Asked Questions

Carry the building lateral piping, the tap or connection to the main, excavation, shoring or trench protection, bedding and backfill, any dewatering, restoration of disturbed surfaces, and municipal tap and permit fees. Confirm invert elevations and depth from the plans, since deeper-than-expected mains drive up excavation and shoring costs quickly.
Sanitary sewer carries wastewater to treatment, while storm sewer handles runoff; in modern separated systems they are distinct pipe networks with different materials, slopes, and pay items. Estimators must take off and price each separately. Mixing the two in a takeoff causes quantity errors and scope disputes during construction.
Municipal connection, tap, and capacity or impact fees can be substantial and vary widely by jurisdiction, yet they are easy to forget because they are not on the drawings. Verify current fee schedules with the utility and list them as an allowance or explicit line so the owner sees them clearly.

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