The science of the home you live in.

Your body responds to a different line than the legal limit. This library measures your water, air, and light against what the health research supports, and tells you where your home stands.

Stasis Home Research Updated October 2026 Every claim on this page is graded against peer-reviewed health research and linked to its primary source.

43 topics
46 guides
12 methods
10 comparisons

Start with a question

Is my tap water safe to drink? For most people on a US public water system, tap water will not make you sick today, which is a low bar.
Why is the air inside my house worse than outside? Indoor air is often worse than outdoor air because a modern house seals tight and traps what gets made inside it.
Is it bad to sleep with the lights on? Yes, sleeping with the lights on is worse for you than most people assume, and dim light counts.
How do I find out what is actually in my water? Two sources tell you.
Do I need an air purifier? An air purifier helps if your problem is airborne particles: cooking smoke, wildfire haze, traffic soot, pollen, or pet dander.
Do I need a water filter? For most US homes, yes.

All the guides

The Three Invisibles

Before you buy anything

Filters, purifiers, ventilation, and the rest, graded against the research. Including the popular fixes that do nothing, and the exposures we do not test because the evidence does not support it.

What works, and what does not

The legal limit and the health line can sit far apart.

Arsenic
Health-based level 0.004 ppb one-in-a-million cancer risk
Legal limit 10 ppb CA + federal MCL; federal MCLG is 0
Legal limit 2,500x the health line
Source: CA OEHHA PHG, 2004
PM2.5, annual
Health-based level 5 µg/m³ health-based guideline; no safe floor
Legal limit 9.0 µg/m³ federal limit, revised Feb 2024 from 12; under industry litigation
Legal limit 1.8x the health line
Source: WHO 2021 AQG (annual 5) / US EPA NAAQS (9.0)

Nobody authoritative owns the home-environment interpretation layer.

Your utility reports to the legal limit and your home devices report a raw number, but neither tells you what those readings mean for your body.

That is the layer Stasis owns. We grade every reading against peer-reviewed health research rather than the legal limit. That limit is set for what a whole city can feasibly meet, not for the dose your body takes in. Same number, different question: is this allowed, or is this good for you.

The full methodology: how we grade what we find