or modified, the designer and contractor need to consult the local plumbing code and obtain a building permits prior to construction.[3][4] Even replacing an existing water heater may require a permit and inspection of the work. National and local fire codes should be integrated in the design phase of the water system too to prevent "failure comply with regulations" notices. Some areas of the United States require on-site water reserves of potable and fire water by law.

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City of Larkspur

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