Regarding the use of groundwater as a source of water for firefighting purposes
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In the design of fire protection systems for many projects today, the standards regarding the water used to replenish fire-fighting water vary. Some require fresh water to be used for this purpose, while others allow groundwater to be used directly. Yet again, in some cases the quality of the groundwater must be taken into consideration; if it does not meet the required standards, it needs to go through a pretreatment process before it can be used to replenish fire-fighting water. Please discuss what the requirements are for replenishing fire water, and which standards can be referred to? Additionally, will the local **fire safety authorities have lower requirements regarding low aromatics, higher than the standard requirements?
Several companies I’ve come across use fresh water as a source to replenish fire-fighting water； In my opinion, using groundwater directly for watering is not very advisable; (in some areas the water quality may be better,) but in many places the groundwater contains too many impurities, and over time this can lead to clogs in the fire sprinklers.) If groundwater is indeed to be used, at least a filtering device should be installed ； In addition, some places have strict restrictions on the extraction of groundwater.
The Technical Code for Fire Water Supply and Fire Hydrant Systems GB 50974-2014 sets requirements for using natural water sources as fire water. 4.4.2 When well water is used as a fire-fighting water source to supply water directly to the fire-fighting water supply system, its most unfavorable water level must meet the requirements for water intake by the pumps; its minimum flow rate and pump head must satisfy fire-fighting requirements. Moreover, when two sources of fire-fighting water are required, there should be no fewer than two wells, and the power supply for the deep well pumps in each well must be classified as a first-class power load. 4.4.4 When natural water sources are used as outdoor fire-fighting water sources, technical measures shall be taken to prevent substances such as ice, floating objects, and suspended particles from clogging the fire pumps. Measures should also be taken to ensure the safe acquisition of water. When well water is used as a fire-fighting water source, a water level monitoring device to detect the water level in the well should also be installed.