This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of main.

n. The domestic electrical power supply.

n. The pipes of a centralized water supply that transport the water to individual buildings.

n. The farm attached to a mansion house.

n. The farm attached to a mansion house; a manse.

n. The source of electrical power in a building; the wiring system of a building.

n. The farm or fields attached to a mansion-house; the home farm.

"The pressure in the city mains is often not sufficient to raise the water to the second story roof level during peak demand periods -- most of the day -- but there is enough pressure at night."

water main   

manse   

Danes    Janes    Keynes    Mainz    Manes    Plains    Raines    Staines    attains    bains