PFAS & Water Quality in Fresno, CA

Where Fresno's drinking water comes from

Much of the Fresno area, sitting in the San Joaquin Valley, has historically relied heavily on local groundwater pumped from the valley's aquifers, with surface water from Sierra Nevada rivers increasingly blended in to ease the strain on those aquifers. The region tends to lean harder on groundwater during dry years, so the balance between pumped and surface supply shifts with conditions rather than holding steady.

Pinning down who serves your Fresno address is worth a few minutes, because the valley is stitched together from city systems and smaller surrounding districts. The utility shown above reflects federal records, but a home just outside a service boundary can be on an entirely different public water system, so the citywide view isn't automatically your tap. When evaluating an address, it's worth reviewing the utility's annual Consumer Confidence Report and calling the system serving you, both free and far more specific than this page.

Fresno water hardness

Fresno folks puzzling over crusty faucet aerators and a tired water heater are usually dealing with hardness, an appliance headache rather than a health worry. Groundwater across much of the San Joaquin Valley tends to run hard, though your own figure depends on your system and how much surface water is blended in. We won't invent a number; a hardware-store test strip or your utility's annual report, which frequently lists hardness, will give you the real one.

Reading this when you're evaluating a Fresno address

City-level numbers describe the broad pattern around Fresno; two homes a mile apart can sit on different water systems with very different profiles. The address report fills that gap — it identifies the public water system serving a specific property, lists any PFAS detections on that exact system, and maps the nearby industrial and Superfund sources.