Do You Know Where Your Water Comes From?; Short Burst Hot Break- Fast reads. Big flavor.

Do You Know Where Your Water Comes From?


When it comes to brewing—or even just understanding your tap water—it helps to know whether your supply comes from groundwater or surface water. Groundwater is drawn from aquifers deep below the earth’s surface, where it has been filtered naturally through layers of soil, sand, and rock. This slow filtering process removes many organic compounds but dissolves minerals along the way. As a result, groundwater often contains higher levels of calcium, magnesium, and other dissolved solids, giving it a “harder” character.

Surface water, on the other hand, comes from rivers, lakes, and reservoirs. Because it’s exposed to the environment, it typically contains more organic material—think leaves, algae, or other natural matter—and fewer dissolved minerals compared to groundwater. Treatment plants can clean and balance these waters for drinking, but brewers should keep in mind that surface water may be softer yet more variable seasonally, while groundwater is more stable but mineral-rich. Understanding the difference helps you predict how your water will behave in the mash and what adjustments you may need for the best beer.

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