Just arranging for transportation to and from the site becomes critical. The site staff has homes and families to take care of, need hotel rooms and food, etc. In the case of a long-term crisis event such as a hurricane, regional flood, or blizzard, it is not sufficient to consider how much fuel oil and drinking water you need. So the question becomes not only how critical are the on-site staff, but how long can you sustain the mission without on-site staff? Otherwise the health inspector will close the facility and send everyone home. Eventually bathrooms become mission critical unless the site is truly autonomous (no need for an on-site staff) or there aren’t provisions for alternate bathroom facilities and drinking water. The short coming is that the facility cannot remain occupied without bathrooms and drinking water for an extended period. These provisions can facilitate long-term continuous operations of the chiller plant without reliance on city water.
Most of these sites have provisions for the potential loss of city water by installing make-up water storage tanks, tanker truck connections, or wells (or a combination of all of the above). For data centers that rely on water-cooled chiller plants or evaporative coolers, city water typically supplies water to the “critical” make-up water systems. Consider the domestic city water system that pretty much all facilities have. This becomes the realm of disaster recovery and business continuity. But if it happens to impact pay-day for all the employees, and timesheets can’t be completed, or contracts can’t be executed, work tickets and service requests can’t be processed, etc., the impact could be substantial. If you lose the corporate administrative office and associated human resources, accounting, payroll, legal counsel, etc., for an hour or maybe a day, there might not be a noticeable effect on the overall corporate mission, especially for the company’s external clients.
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