Shiloh Water Hardness & Quality Report (2026)

Shiloh Water Authority supplies public water to parts of York County, Pennsylvania, mainly the Shiloh area. Their system uses multiple water sources, with the main treatment plant at 2115 Log Cabin Road, York, PA 17408. Water flows from the lower Susquehanna River watershed, passing through the Great Valley physiographic province. This region's geology features highly soluble, Ordovician-age limestone and dolomite formations. As water moves through these carbonate rocks, it picks up substantial amounts of calcium and magnesium, leading to a hard water supply. The Susquehanna River itself, enriched by limestone-heavy tributaries, adds further minerals to their tertiary emergency source.

These Ordovician-age limestone and dolomite formations are characteristic of the Great Valley province in Pennsylvania. Because these carbonate bedrock units are highly soluble, they readily release calcium and magnesium ions as water flows over and through them. This natural geological process is the primary reason for the hard water supply provided to Shiloh customers. The Susquehanna River also contributes mineral content to the water, further influencing its hardness.

Residents in the Shiloh service area might notice scale buildup in appliances like kettles and water heaters, as well as in pipes. You'll likely find that soaps and detergents don't lather as effectively with this water. Stains can appear on fixtures and laundry, and appliances such as dishwashers and washing machines may need more detergent and frequent upkeep. While not a health necessity, many homeowners opt for water softening systems to mitigate mineral deposits and prolong appliance life. For corrosion control, the Shiloh Water Authority manages the water's pH. They did detect a small amount of Cryptosporidium oocysts in the Susquehanna River source during testing.