Ponca City Water Hardness & Quality Report (2026)

The Ponca City municipal water utility serves the city and surrounding areas in Kay County, Oklahoma, drawing from three primary water sources: a wellfield system extending roughly eight miles along the Arkansas River, supplemented by surface water from Kaw Lake and Lake Ponca. This combination of groundwater and surface water creates a mixed supply system serving both the municipality and surrounding communities. All test results from the utility indicate that Ponca City's potable water meets the Drinking Water Quality Standards established by the United States Environmental Protection Agency.

The water supply originates from the Arkansas River valley watershed, characterized by Permian-age geological formations including sandstones and shales, along with alluvial deposits in the river floodplain. The wellfield serves as the primary supply source, drawing from aquifers in this valley setting. This geology contributes moderate mineralization to groundwater, while the surface water sources at Kaw Lake and Lake Ponca introduce additional mineral variability characteristic of mixed supply systems in this region of Oklahoma.

Specific hardness data was not available from the utility's most recent reports, though the Source Water Assessment Plan rates the system with a "medium" susceptibility classification. Residents should consult the utility's annual Consumer Confidence Report for detailed hardness measurements and treatment information relevant to appliance maintenance. For comprehensive information on pH, lead and copper compliance, and other parameters, contact the Ponca City Water Department directly via poncacityok.gov. The utility maintains full compliance with EPA Drinking Water Quality Standards.