Hard Water by State: The US GPG Map, Hardest Cities, and What Your Number Means for Sizing
Hard water affects around 85% of US homes, but the hardness levels vary enough by location that Phoenix and Seattle might as well be dealing with different substances. Geography is the main driver. Limestone geology in the Southwest and interior plains pushes municipal supply to 15 or 20 GPG in many cities. Snowmelt-fed reservoirs in … Read more