Water Quality & Forever Chemicals
Searching "San Jose water quality" and bracing yourself? Take a breath. What you've found is a summary of what public federal water records show for San Jose, pulled into one readable spot, not a personal report card on your faucet. The thing that genuinely varies from one San Jose home to the next is the utility serving your address and the sources behind it, which is exactly the detail a city-wide page can't pin down for you.
0
PFAS detections in nearby water systems
EPA UCMR 5 (2021–2024) results matching the city name
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Industrial PFAS facilities in city
EPA TRI 2024 reporting
11
DoD PFAS installations statewide
In California
Much of the San Jose and broader Santa Clara Valley region historically leans on a mix of local groundwater and imported supply, with surface water captured in nearby reservoirs playing a meaningful role too. The valley tends to draw down its aquifers during dry stretches and recharge them when imports allow, so the balance between local and imported water shifts with conditions rather than staying fixed.
Knowing who serves your San Jose address matters more than the citywide summary, because the valley's water gets wholesaled and retailed through more than one system. The utility named above reflects federal records, but a neighbor a few blocks over may be on a different public water system entirely. When evaluating an address, it's worth reviewing that utility's annual Consumer Confidence Report and simply phoning the system serving you. Both are free, and they answer the address-level questions this page honestly cannot.
San Jose residents decoding why the kettle keeps scaling up are usually meeting hardness, which is a chores-and-appliances annoyance rather than anything to lose sleep over. Groundwater across much of the Santa Clara Valley tends to run hard, but your tap's actual figure depends on your system and the day's blend. Rather than trust a generic claim, run a hardware-store test strip or check your utility's annual report, which often tucks a hardness figure in among the acronyms.
EPA required public water systems serving 3,300+ people to test 29 PFAS compounds between 2021 and 2024.
City-level numbers describe the broad pattern around San Jose; 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.
Guide
How to Check Drinking Water Quality Before Buying a Home
The 5-minute version of what an environmental consultant would look at.
Guide
PFAS “Forever Chemicals” — A Homebuyer's Guide
What PFAS are, why they matter, and what to do before closing.
How-to
How to Check for PFAS Near Your Address
A walkthrough of the federal datasets we pull from.
Checklist
Environmental Risks to Check Before Buying a House
A practical pre-offer checklist for buyers and agents.
We summarize what federal public records such as UCMR 5 show for San Jose instead of declaring it safe or unsafe. A detection in those records differs from an exceedance, and because the program focuses on larger systems, a quiet result means no records turned up here, not a guarantee. For an address-level answer, check the specific system serving your San Jose home.
Begin with the system or systems shown on this page from the federal records, then find that utility's published contact details and its annual Consumer Confidence Report. Because the Santa Clara Valley is served through more than one public water system, an address a few streets away can have a different provider, so confirm yours before applying the citywide view.
Much of the San Jose and Santa Clara Valley region relies on a blend of local groundwater, imported supply, and surface water held in nearby reservoirs. The valley tends to lean harder on its aquifers during dry years and recharge them when imports allow, so the local-versus-imported balance shifts with conditions rather than staying the same.
Groundwater across much of the Santa Clara Valley tends to run hard, but hardness is a dishes-and-appliances issue, not a health one, and we won't post a number we can't verify for your tap. To find your own figure, use an inexpensive test strip or look through your utility's annual report, which commonly lists hardness among the details.
Enter an address — we'll identify the serving water utility, pull PFAS detections, FEMA flood zone, and nearby Superfund sites, then give you a plain-English A–F grade. $19.99 single, $29.99 two-address bundle.
One-time report. PFAS, water violations, Superfund sites, flood zone, air quality, and a plain-English A–F grade for the address.
More California data: Superfund sites · PFAS in California
Two-address bundle $29.99 · Same-day delivery