PureCity analyzes local water context to help you choose a filtration setup that fits your priorities.
Free · No account required · Based on EPA data
Provide your location to access localized water quality context and utility data.
We compare EPA reference points with what's commonly reported for your area.
Receive a practical recommendation for a filter type and maintenance schedule.
Our recommendations are educational guides, not lab results. Every reference point links directly to its EPA source so you can verify the data yourself.
For authoritative utility-specific data, review your annual Consumer Confidence Report (CCR) — required by law from every public water system.
Transparent reference links includedFor most people in the US, tap water is safe to drink — public water systems are required by law to treat and test their water regularly. That said, "safe" and "perfect" aren't the same thing. Water that meets all legal standards can still taste off, contain trace levels of contaminants like lead from old pipes, or include disinfectant byproducts from the treatment process itself. A filter isn't about panic — it's about preference and a reasonable extra layer of care, especially for young children, pregnant women, or anyone with a compromised immune system.
The most common issues fall into a few categories. Lead is the most serious — it has no safe level for children and leaches from older plumbing, not the water source itself. PFAS ("forever chemicals") are a growing concern in regions near industrial sites or military bases, linked to certain cancers and hormonal disruption with long-term exposure. Nitrates, common in agricultural areas, pose a particular risk to infants. Chlorine and chloramine are added intentionally to keep water safe in transit, but they can affect taste and odor. Hardness isn't a health issue, but it's hard on appliances and skin.
It depends on the type. Pitcher filters and faucet-mount filters require zero installation — you fill one, or twist the other onto your tap in about two minutes. Under-sink carbon filters take 30–60 minutes and just need a wrench; most come with clear step-by-step instructions and no plumbing experience is needed. Reverse osmosis systems are the most involved — typically 1–2 hours, and they require connecting to your cold water supply line and drilling a small hole in your sink for a dedicated faucet. Many homeowners do it themselves comfortably.
Usually not. Faucet-mount and pitcher filters need no help at all. Under-sink carbon filters are designed for DIY installation and most brands include video guides. For reverse osmosis, it's genuinely optional — the installation isn't complicated, but if you're not comfortable working under a sink or shutting off a water valve, a plumber can do it in under an hour and it's not expensive. Some people also choose to hire a handyman rather than a licensed plumber for that kind of job.
Yes, and it's actually common practice. Many homes run a sediment pre-filter first to catch rust and particles, then a carbon block for taste and common contaminants, and optionally an RO membrane for the broadest reduction. Each stage does a different job, and combining them is the same logic as layering sunscreen — more coverage where you need it. Just make sure the filters are compatible, replace each one on its own schedule, and don't over-engineer it: for most households, a single quality under-sink carbon filter is already a significant upgrade.
It varies by type. Pitcher filters typically need replacing every 2–3 months. Faucet-mount filters last about the same. Under-sink carbon block filters generally run 6–12 months depending on usage and water quality. Reverse osmosis membranes can last 2–5 years, but the pre- and post-filters on the same system need annual replacement. Most modern systems take the guesswork out of it with filter life indicators or app reminders — it's worth factoring that in when you choose a brand.
Legal limits are set at levels regulators consider safe for the general population — but they're not zero, and they're not always based on the latest science. Some contaminants, like lead, have no truly safe level. Others, like PFAS, had no federal limit at all until 2024. Beyond that, legal safety and personal preference are different things: plenty of people filter simply because their water tastes better filtered, and that's a completely valid reason.
The water profile is an estimate based on regional characteristics common to homes in your area — not a lab test of your specific tap. The safety thresholds shown in the reference table are established public health standards developed through decades of scientific research. For precise data on your actual water utility, your Consumer Confidence Report (CCR) is the gold standard — every public water system in the US is legally required to publish one annually, and it's free.