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Plumbingaka: potable wateraka: domestic cold wateraka: DCW

Domestic Water

In Plain English

The clean, drinkable water piped throughout a building for sinks, showers, toilets, and drinking.

Definition

Potable water distributed within a building for drinking, cooking, sanitary, and general use purposes. Domestic water systems include cold water supply, hot water distribution, and associated valves, fixtures, and equipment. Water quality, pressure, and temperature requirements are governed by the plumbing code.

Why It Matters in Bidding

The domestic water system is a core plumbing takeoff item, where pipe material, sizing, insulation, and hot-water generation drive both material and labor cost. Estimators must read the spec for the required piping material and the code-driven sizing, since substituting the wrong material or missing the hot-water recirculation scope creates a non-conforming, underpriced bid.

Example

Pricing a hotel's plumbing package, an estimator takes off the domestic cold and hot water risers in the specified copper, then adds the hot-water recirculation loop and pipe insulation the specs require but that are easy to overlook in a quick scan of the plans.

Related Terms

Water HeaterPressure RegulatorSupply LineMain Shutoff Valve

Frequently Asked Questions

Estimators take off cold and hot water piping by material and diameter, plus fittings, valves, hangers, insulation, water heaters or heat exchangers, recirculation pumps, and connections to each fixture. Code-driven sizing and the specified pipe material, such as copper or PEX, set the unit costs and installation labor carried.
Copper, PEX, and CPVC differ sharply in material price and installation labor, and the specs usually dictate which is acceptable. Pricing PEX where copper is required, or vice versa, makes the bid non-conforming. Estimators confirm the specified material and any local code or owner preference before pricing the system.
Recirculation loops and their pumps and insulation are easy to overlook because they may be called out in the specifications rather than drawn prominently on the plans. Missing this scope understates pipe length, insulation, and pump cost. Careful spec review during takeoff catches the requirement before the bid is submitted.

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